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以羟烷基胺和聚乙二醇分别与硼酸反应,合成二种硼酸酯,羟烷基胺硼酸酯最佳合成工艺条件为n(羟烷基胺):n(硼酸)=3∶1,反应温度为120～130℃,反应时间为2h。聚乙二醇醚硼酸酯最佳合成工艺条件为n(聚乙二醇醚):n(硼酸)=3∶1,反应温度为140±20℃,时间为4h。以二种硼酸酯和多乙二醇醚为主体材料,制备高级制动液,其平衡回流沸点为252℃,-40℃运动粘度为1125mm2 s,其余指标也完全达到国标GB10830—1998中JG4标准。
Hydroxyalkylamines and polyethylene glycol were respectively reacted with boric acid to synthesize two kinds of boric acid esters. The optimum synthesis conditions of hydroxyalkylamine boric acid ester are n (hydroxyalkylamine): n (boric acid) = 3: 1, the reaction temperature is 120 ~ 130 ℃, the reaction time is 2h. The best synthesis conditions of polyglycol ether boric acid ester were n (polyglycol ether): n (boric acid) = 3:1, the reaction temperature was 140 ± 20 ℃ and the time was 4h. Two kinds of boric acid ester and polyglycol ether are taken as the main materials to prepare advanced brake fluid. The equilibrium reflux boiling point is 252 ° C., the kinematic viscosity at -40 ° C. is 1125 mm 2 s, and the rest of indexes fully meet the requirements of JG 4 of national standard GB10830-1998 standard.