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设计并合成了油溶性环烷酸锌和异氰酸酯类超分散稳定剂,采用原位构筑方法获得了非水纳米ZnS分散系,用冷冻蚀刻电镜对其进行了表征,用离心实验对其分散稳定性进行了考察.对纳米粒子的形成过程、分散稳定机理进行了阐述.用环块和四球摩擦试验机对纳米ZnS分散系的摩擦学性能进行了研究.结果表明:ZnS为40 nm的粒状颗粒,大小均匀,在介质中呈单粒子分散;纳米分散系经72 h普通离心和56 h非连续超离心均未发生沉降,表现出理想的分散稳定性;试验显示超分散稳定纳米ZnS的存在,能明显改善油样的抗磨减摩性能和承载能力.在试验范围内,添加的纳米ZnS的量越大,其抗磨减摩性能也越好,但当n-ZnS的质量分数大于0.25%时,其承载能力趋于稳定.
Oil-soluble zinc naphthenate and isocyanate hyperdispersants were designed and synthesized. The in-situ nanostructured ZnS dispersion was obtained and characterized by freeze-etching electron microscopy. The dispersion stability was determined by centrifugal test Were studied.The tribological properties of nanosized ZnS dispersion system were studied by ring block and four ball tribometer.The results showed that the particle size of ZnS was 40 nm, Uniform size and single particle dispersion in the medium. The nanodisperse system did not settle after 72 h of ordinary centrifugation and 56 h of discontinuous supercentrifugation, which showed the ideal dispersion stability. The results showed that the existence of super-dispersed and stable nanosized ZnS Significantly improve the antiwear and antifriction performance and bearing capacity of the oil sample.With the experimental range, the greater the amount of nano-ZnS added, the better anti-wear and antifriction performance, but when the mass fraction of n-ZnS is greater than 0.25% , Its carrying capacity tends to be stable.