Structural regulation of poly(urea-formaldehyde) microcapsules containing lube base oil and their thermal properties
Structural regulation of poly(urea-formaldehyde) microcapsules containing lube base oil and their thermal properties
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润滑油基础油聚脲甲醛微胶囊的结构调控及其热性能
DOI：
10.1016/j.porgcoat.2020.105990
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发表时间：
2021-01-01
影响因子：
6.6
通讯作者：
Li, Zhong-Ming
中科院分区：
文献类型：
--
作者：
Gao, Ping-Ping;Zhou, Zi-Han;Li, Zhong-Ming
调节含有润滑剂的微胶囊的微观结构对其性能和随后的复合材料的自润滑性能至关重要。本研究采用原位聚合技术制备了以润滑油基础油为润滑剂的聚(尿素-甲醛)微胶囊。通过改变乳化剂含量、均质时间、油粘度和合成方法，研究了PUF微胶囊的结构和性能。环境友好型乳化剂木质素磺酸钠的含量对PUF微胶囊的规整性和核心含量有重要的调节作用。均质时间和油的粘度直接影响PUF微胶囊的粒径和分布。此外，油的粘度对PUF微胶囊的形态和热行为起着重要的调节作用。具体来说，通过添加低含量的乳化剂(0.2wt%)，可以得到分散良好的球形微胶囊。采用15号油为芯材，乳化剂质量分数为0.2wt%，可获得高达89.2wt%的岩心含量。当使用高粘度的润滑油基础油(32#、46#油)时，微胶囊具有致密的球形结构和较高的热稳定性，其起始分解温度高达251.8℃。本研究为制备具有合适结构和性能的PUF微胶囊提供指导，以改善不同聚合物的摩擦学性能。
Regulating the micro-structure of microcapsules containing lubricant is paramount to their properties and the subsequent self-lubrication performance of the composites. In this study, poly(urea-formaldehyde) (PUF) microcapsules containing lube base oil as lubricant have been fabricated by in-situ polymerization technology. The structure and properties of PUF microcapsules are investigated by altering the emulsifier content, homogenization time, oil viscosity and synthetic method. The content of sodium lignosulfonate, an environment-friendly emulsifier, has important regulation effect on the regularity and core content of PUF microcapsules. The homogenization time and oil viscosity directly affect the particle size and distribution of PUF microcapsules. Moreover, the oil viscosity plays an important role in regulating the morphology and thermal behavior of PUF microcapsules. Specifically, by adding low content of emulsifier (0.2 wt %), well-dispersed spherical micro capsules are obtained. Adopting 15# oil as core material and 0.2 wt % emulsifier, high core content of up to 89.2 wt % is achieved. When using lube base oil (32#, 46# oil) with high viscosity, the microcapsules show compact spherical structure and high thermal stability, with the initial decomposition temperature of up to 251.8 degrees C. This research can provide guidance for fabricating PUF microcapsules with suitable structures and performances for improving the tribological properties of different polymers.