<br>通过调节稠化剂网络结构改善复合润滑聚脲脂的油分离,Macromolecules

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通过调节稠化剂网络结构改善复合润滑聚脲脂的油分离
Macromolecules ( IF 5.1 ) Pub Date : 2024-05-23 , DOI: 10.1021/acs.macromol.4c00101
Jiabei Wang _{1,

2} , Zhaoyang Guo _{1,

2} , Wenjing Hu _{1,

3} , Xiuhong Li ₄ , Hengyi Lu ₁ , Jiusheng Li _{1,

3}

Affiliation

润滑脂由充满基础油的稠化网络组成。它主要通过其内部网络分泌油脂来发挥润滑作用，保护摩擦表面。锂价格的上涨及其生理毒性使聚脲润滑脂成为最有前途的润滑剂之一。基于预合成增稠剂的制造策略避免使用有毒原材料，代表了润滑脂的绿色生产路线。然而，增稠剂结构、油分离和摩擦学性能之间的相关性仍不清楚。本文通过预合成稠化剂策略调节聚醚油的聚合度，合成了三种具有不同稠化剂结构的聚脲润滑脂。对增稠剂结构演变的实时观察表明，增加油聚合度将有助于形成更长的增稠剂纤维。在较高聚合度油（HG）中观察到由长纤维组成的高强度网络结构。低场核磁共振表征和分子模拟的综合结果表明，较高聚合度的油会在基础油和稠化剂之间诱导出更多的氢键，从而为基础油分子提供较强的结合能力，并在界面上实现稳定的油分离。剪切过程。因此，HG润滑脂即使在严格的测试条件下也能保持有效的保护。这些结果可以为复合润滑脂的结构-性能关系提供新的见解，并有助于开发高性能润滑剂。

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Improving the Oil Separation of Composite Lubricating Polyurea Grease via Regulating the Thickener Network Structure

Lubricating grease comprises a thickener network filled with base oil. It mainly exerts a lubricating effect by secreting oil inside its network to protect the friction surface. The increase in lithium prices and its physiological toxicity have positioned polyurea grease as one of the most promising lubricants. Presynthetic thickener-based fabrication strategy, which avoids using toxic raw materials, represents a green production route for grease. However, the correlation among thickener structure, oil separation, and tribological performance remains unclear. Herein, three polyurea greases with different thickener structures were synthesized by adjusting the polymerization degree of the polyether oil via the presynthetic thickener strategy. The real-time observation of the thickener structure evolution revealed that increasing the oil polymerization degree would help form longer thickener fibers. A high-strength network structure composed of long fibers was observed in a higher polymerization degree oil (HG). The combined results of low field nuclear magnetic resonance characterization and molecular simulations reveal that a higher polymerization degree oil will induce more hydrogen bonds between base oil and thickener, thereby providing a strong binding ability to the base oil molecules and stable oil separation at the interface during the shearing process. As a result, HG grease could maintain effective protection even under strict test conditions. These results can provide new insights into the structure–property relationship of composite grease and help to develop high-performance lubricants.

更新日期：2024-05-23

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