疏水性硼酸钙纳米添加剂对菜籽油摩擦学性能的影响

EFFECT OF HYDROPHOBIC CALCIUM BORATE NANO-ADDITIVE ON TRIBOLOGICAL PERFORMANCE OF RAPESEED OIL

分别使用硬脂酸、油酸、乙二胺四乙酸、聚乙二醇等对硼酸钙进行表面改性,制备了多种具有不同疏水性的纳米硼酸钙润滑油添加剂;进而,通过扫描电镜、傅里叶变换红外光谱、摩擦试验等方法系统研究了改性纳米硼酸钙对菜籽油抗磨、减摩性能的影响.结果表明:在各种表面改性纳米硼酸钙中,硬脂酸改性硼酸钙的疏水性最佳,油酸改性硼酸钙的疏水性次之,乙二胺四乙酸改性硼酸钙表面仍呈亲水性,聚乙二醇未实现对硼酸钙的化学改性;在菜籽油中添加不同改性纳米硼酸钙后,硬脂酸改性硼酸钙提升菜籽油抗磨、减摩性能的效果最佳;当其添加量(w)为0.5%时,润滑油样品的摩擦因数和试验钢球的磨斑直径分别比菜籽油基础油减小22%和24%.

The surface of calcium borate was modified by stearic acid,oleic acid,ethylenediamine-tetraacetic acid and polyethylene glycol,respectively.Various nanometer calcium borate lubricant additives with different hydrophobicity were prepared,and the effect of the modified calcium borate nano-additives on the antiwear and friction-reducing performance of rapeseed oil was systematically investigated by means of SEM,FTIR and tribological test.The results show that the stearic acid-modified calcium borate has the best hydrophobicity,the oleic acid-modified calcium borate has the second hydrophobicity,and ethylenediaminetetraacetic acid modified calcium borate still was hydrophilic,but the calcium borate had not been chemically modified by the polyethylene glycol.It is found that the calcium borate modified with stearic acid shows the best anti-wear and friction-reducing performance in rapeseed oil.When the dosage of calcium borate modified with stearic acid in rapeseed oil was 0.5%,the friction coefficient and the wear scar diameter of the test steel ball were decreased by 22%and 24%than that of rapeseed oil base oil,respectively.