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Abstract ：This work deal with the influence that addition of poly tolylene 2,4-diisocyanate terminated prepolymer at different stages during the manufacturing process of a traditional lithium lubricating grease exerts on its rheological and morphological characteristics.With this aim ,the reaction between terminal isocyanate groups and the hydroxy group located in the hydrocarbon chain of the 12-hydroxystearate lithium soap was intended to be promoted during lubricating grease processing.Several PBTDI-based greases just differing in the process stage at which this polymer was added were prepared. The polymer used and the final lubricating greases were characterized by FTIR spectroscopy and DSC techniques. The effect of PBTDI addition at different processing stages was tasted on final greases by performing small-amplitude oscillactory shear (SAOS)measurements as well as atomic force microscopy(AFM)observations. Addition of PBTDI significantly increased the values of the linear viscoelasticity functions when it was added during the final cooling stage of the manufacturing process. it was demonstrated that this increment in relation to the values found for the additive-free lubricating grease was only observed when PBTDI chemically interacted with the soap network. However , the effectiveness of PBTDI as rheology modifier was much lower when the addition took place at earlier steps of the manufacturing process.Some competitive reactions due to either the presence of water or the high temperatures applied have been proposed to explain this loss of effectiveness depending on the lubricating grease processing stage at which PBTDI was added. |
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柠檬晓精灵: 金币+30, 翻译EPI+1, ★★★很有帮助 2013-04-02 13:05:39
柠檬晓精灵: 金币+30, 翻译EPI+1, ★★★很有帮助 2013-04-02 13:05:39
| 摘要：此试验主要研究，加入不同程度的聚亚甲苯基2,4 - 二异氰酸酯对传统锂润滑脂生产过程中的影响。为此，位于烃链中的12 - 羟基硬脂酸锂皂的羟基和终端异氰酸酯组之间的化学反应会促进润滑油脂加工。一些基础PBTDI-润滑脂只是在不同阶段加入在该聚合物溶液。用红外光谱和DSC技术确定最终产物润滑脂的特点。通过最终产物油脂进行小幅度剪切（SAOS）测量以及原子力显微镜（AFM）观察确定PBTDI在不同时期对生产过程中的影响。在冷却过程中添加时可发现PBTDI线性粘弹性功能值数明显增加。实验结果表明，这些增量只有在PBTDI的相互作用之下才看到。不过在早期生产过程中，PBTDI作为流变改性剂其影响不大。由于水的存在或高温导致的一些竞争反应可解释PBTDI的有效性降低取决于所加入的润滑脂加工阶段。 |
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