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Preparation of Nano-micro Borate Microcapsule and Study of Anti-wear Property

Author: XuXiaoHui
Tutor: RenFuMin
School: Beijing Jiaotong University
Course: Environmental Engineering
Keywords: Nano-micron borate Microemulsion Antiwear property Microcapsule Nanotechnology
CLC: TB383.1
Type: Master's thesis
Year: 2011
Downloads: 46
Quote: 0
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Abstract

In recent years, research and practice shows that the fuel consumption level and lubricating materials have a great relationship, about 80% of the mechanical parts don’t work because of wear, and terrible accident of more than 50% of the mechanical equipment is caused by lubrication failure and excessive wear. At home and abroad, very early studies have shown that inorganic potassium borate,environmentally friendly lubricant additive, has very good anti-wear and anti-friction performance.But the main problem is that anti-wear Capacity of borate additives is impacted by dispersion stability and water absorption, therefore borate additives is difficult to be applied. As nanotechnology and other emerging technology development, the further research on nano-micron borates lubricant additives, and to be applied in practice, it has very important practical significance.Firstly, in the paper, nano-micro potassium borate and lithium borate are prepared by reverse micro emulsion method, then microcapsule were prepared by using microcapsule technology, with ethyl cellulose as the shell and the prepared borates as the core. Performances of microcapsule were characterized by SEM, XRD, IR and TG, and finally anti-wear properties of microcapsules were tested by rattling machine. The results show that:(1) K2B4O7 and Li2B2O4 nano-micron particle were prepared by method of reverse micro emulsion. The product of preparation were characterized by SEM, as a result, shape of product is spheroid, Particle size is in 1～5μm.(2) Microcapsule was prepared by using method of oil phase separation, with ethyl cellulose as the shell and the prepared borates as the core. The optimum condition was that the mass ratio of wall-material and core-material was 3:1. By comparing the infrared spectra of uncoated core-material and coated microcapsule, the shows that core material and wall materials is no produces chemical reaction, core material potassium borate and lithium borate were encapsulated in ethyl cellulose. Potassium borate microcapsule coated rate is higher than lithium borate microcapsule.(3) Thermal performance of uncoated core-material, potassium borate and lithium borate, and coated microcapsules were characterized by TG. As a result, coated microcapsules are better than uncoated core-material, and thermal stability of potassium borate microcapsule is better than lithium borate microcapsule. Thus microcapsule is prepared by using method of oil phase separation can achieve the purpose of improving thermal stability.(4) Anti-wear performance test shows that anti-wear properties of base oil of containing additives are better than the base oil itself, pressure and anti-wear of additive as potassium borate microcapsule is better than lithium borate microcapsule, it show that the prepared borates microcapsule play the role of the anti-wear. When the content of additives is 0.8%, anti-wear performance of base oil is the best.

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