【摘要】 为提高铜纳米颗粒在润滑油中的分散性能,以聚甘油和硬脂酸为原料合成了一系列聚甘油硬脂酸酯(PGFE)。通过沉降试验和流变性能的测试,考察了聚甘油的聚合度大小、硬脂酸含量等对分散性能的影响,通过热分析和红外光谱分析对分散剂吸附在铜粉表面的形态和性质做进一步考察。结果表明:当聚合度n=6、硬脂酸含量为65%时分散剂的分散性能良好,分散剂质量分数为1.5%时对流体流变性的影响最小,此时分散剂不仅有物理吸附还有化学吸附,并且极性酯基和羟基是影响吸附性能的主要官能团。更多还原

【Abstract】 To disperse nano Cu powders in non-aqueous media,a series of polyglyceryl fatty acid ester (PGFE) were synthesized.The lypohydrophilic characters of polyglyceryl fatty acid esters were adjusted by changing the contents of fatty acid and the degree of polymerization (n) in the dispersant molecules.The sedimentation and rheology studies show that the most stabIe suspension is observed when the dispersant polymerization degree (n) is 6 and the mass ratio of stearic acid is 65%.When the concentration of the dispersant is 1.5% of solvent weight,there is a tiny effect on rheological property of non-aqueous media.To analyze the adsorption mechanism between nano copper surface and polymer,TG and FT-IR spectra are measured.And the coordination of the functional groups of—COOR and—OH to the surface of Cu made polymer adsorb to the surface of Cu,and affect performance of dispersant directly.更多还原