2,5-二烷氧甲硫基-1,3,4-噻二唑(TD-1,TD-2)的合成及其摩擦学性能

合成了两种新的１，３，４ 噻二唑衍生物：以３６％盐酸、３６％甲醛于室温下搅拌２０ｍｉｎ，４０℃下加入２，５ 二巯基 １，３，４ 噻二唑，搅拌反应１０～１５ｍｉｎ，分别加入正丁醇和苯甲醇，８０℃下反应３～５ｈ，分别得到２，５ 二丁氧甲硫基 １，３，４ 噻二唑（ＴＤ １）和２，５ 二苯甲氧甲硫基 １，３，４ 噻二唑（ＴＤ ２），收率分别为７７６％和６５８％，经ＩＲ、１ＨＮＭＲ和元素分析结构正确。该衍生物具有良好的极压、减摩和抗磨损性能，承载能力在同等负荷和添加剂浓度下比丁辛基二硫代磷酸锌（Ｔ２０２）提高３５％～４５％，在高于３００Ｎ负荷和浓度低于１％（ｗ）的条件下，具有比Ｔ２０２和Ｔ３０７（硫磷酸复酯胺盐）更好的抗磨损性能。差热分析表明，该衍生物还具有良好的热稳定性，起始分解温度均在２２０℃以上。

Synthesis of 2,5-Dialkoxymethylthio-1,3,4-thiadiazole Derivatives and their Tribological Properties

aq.HCl and 36% aq.HCHO are stirred at room temperature for 20min,then 2,5 thiohydoxy 1,3,4 thiadiazole is added and reacted at 40℃ for 10～15min.Two dialkoxymethylthio thiadiazole derivatives,2,5 di n butyloxymethylthio 1,3,4 thiadiazole (TD 1) and 2,5 ditolyoxymethylthio 1,3,4 thiadiazole (TD 2),are synthesized with n butanol and benzaldehyde at 80℃ for 3～5h in 77.6% and 65.8% yield respectively.And their structures are determined by IR, 1HNMR and elemenary analysis.The tribological properties of the derivatives are evaluated using a four ball test machine,and compared with those of zinc dialkyldithiophosphate (T 202 ) and amine salt of thio phosphate complex ester( T 307 ).The results indicate that the compounds possess excellent extreme pressure,friction reduction and anti wear properties,the load carrying capacity of the compounds is increased by 35%～45% over that of T 202 ,the antiwear properties are similDar to those of T 202 and T 307 under 300N load,and they exhibit better antiwear properties than T 202 and T 307 above 300N load.The thermal stability analysis indicates that these compounds have good thermal stability,their first decomposition temperatures are all above 220℃.