摘要：本论文选取了通过两步合成最终产物的制备方法来制备棕榈酸咪唑啉硼酸酯，在溶剂中将棕榈酸和羟乙基乙二胺反应，第一步制得棕榈酸咪唑啉，第二步将第一步产物与硼酸采用分水回流法反应制得最终产物棕榈酸咪唑啉硼酸酯，最后通过减压蒸馏除去产物中的溶剂。81884

实验首先研究了采用溶剂法制备产物棕榈酸咪唑啉硼酸酯的最适宜的制备条件，采用了控制单因素变化的方法对制备棕榈酸咪唑啉硼酸酯的合成条件进行探究，采用带水剂作为溶剂进行反应，通过生成水的数量可以监测反应进度。研究比较得出反应过程应控制温度在160 ℃、中间体棕榈酸咪唑啉摩尔数比硼酸摩尔数为1。0:1。0、反应时间在5小时左右。反应使产物分子中有了配位键，这个含氮的分子内配位键使硼元素的缺电子性减弱了，从而大大提高了产物的水解性能。最后对合成产物使用红外光谱仪对最终的产物进行表征，以确定获得了预计产物。

用含有不同质量分数棕榈酸咪唑啉硼酸酯的润滑脂进行四球摩擦实验机实验,发现润滑脂中添加剂的最适宜添加量为1。5% (wt%)，且油溶性的分子添加剂在润滑脂中存在杰出的分散性和稳定性；用含有不同质量分数添加剂分子的基础油在四球摩擦实验机进行实验时，发现基础油中添加剂的最适宜含量为1。5% (wt%)。测定了基础油、添加1。5% (wt%)棕榈酸咪唑啉硼酸酯的基础油及添加传统的添加剂T202的基础油三者的最大无卡咬负荷PB，结果表明棕榈酸咪唑啉硼酸酯和T202基础油的PB值相当。测定了不同载荷下，无添加剂的润滑油、添加1。5% (wt%)棕榈酸咪唑啉硼酸酯的润滑油及添加1% (wt%)T202的润滑油的摩擦系数，发现1。5% (wt%)棕榈酸咪唑啉硼酸酯的添加剂随载荷的增大摩擦系数增大的最小。最后测定了棕榈酸咪唑啉硼酸酯与T202复配后两者的添加量对基础油的抗磨性能的影响，含1。5% (wt%)棕榈酸咪唑啉硼酸酯的基础油中复配剂T202的最适宜添加量为1% (wt%)。结果表明, 棕榈酸咪唑啉硼酸酯具有优良的抗磨减摩性能，是一种优良的环境友好的润滑添加剂。

毕业论文关键词： 含氮硼酸酯；极压/抗磨添加剂；润滑油；合成条件；环境友好

Synthesis and Tribological Properties of Lubricating Additives of Boric Acid Ester Containing Nitrogen

Abstract：On the paper, we prepared the final product by two-step synthesis of palmitic imidazoline boric acid ester, palmitic acid and hydroxyethylethylenediamine reacted in the solvent, the first step prepared 2-fifteen-alkyl-1-hydroxyethyl imidazole。 Intermediate and boric acid produce the palmitic imidazoline boric acid ester by water persion method, and finally we remove the solvent from the product by decompression distillation。 

    On the paper, we studied the optimum preparation conditions for the preparation of the product by solvent method。 The technological conditions of preparation of the product were studied by controlling the single factor change method。 As a solvent, the reaction progress was monitored by the amount of water produced。 Finally, the final product was characterized by infrared spectroscopy to determine the expected product。 The results of the comparison show that the reaction process should be controlled at 160 ℃, the molar ratio of the2-fifteen-alkyl-1-hydroxyethyl imidazole to boric acid is 1。0:1。0, and the reaction time is about 5 hours。 The reaction lead into a coordination bond in the product molecule, and the nitrogen-containing intramolecular coordination bond weakens the electron deficiencies of the boron element, thereby greatly improving the hydrolytic properties of the product。

    The four-ball friction test was carried out with a grease containing different amounts of product。 It was found that the optimum amount of the additive in the grease was 1。5% (wt%), and the oil-soluble molecular additive was in the grease has excellent dispersion and stability。 The results showed that the optimum content of the additive in the base oil was 1。5% (wt%) when the experiment was carried out with a four-ball friction tester with a base oil containing different mass fraction of additive molecules。 The base oil, the base oil of 1。5% (wt%) palmitic imidazoline boric acid ester and the base oil of the traditional additive T202 were measured with maximum no card bite load。 The results showed that the PB value of palmitic imidazoline boric acid ester and T202 base oil were considerable。 The friction coefficient of lubricating oil with 1。5% (wt%) palmitic imidazoline boric acid ester and lubricating oil with 1% (wt%) T202 was measured under different load, friction coefficient increases with the load increase is minimized with 1。5% (wt%) palmitic imidazoline boric acid ester additive。 Finally, we measured the effect of the wear resistance of the base oil by the addition amount of both the palmitic imidazoline boric acid ester and T202, and the optimum addition amount of the compound T202 in the base oil containing 1。5% (wt%) palmitic imidazoline boric acid ester is 1% (wt%)。 The results show that the palmitic imidazoline boric acid ester has excellent antiwear and anti-friction properties, it is an excellent environment friendly lubrication additive。