纳米AlN润滑材料的制备研究

STUDY ON THE PREPARATION OF NANO-AlN LUBRICATING MATERIAL

从分子设计的角度，采用溶液聚合法将极性单体马来酸酐（MAH）接枝到低分子量的聚丁二烯液体橡胶（LMPB）分子长链中，制备了一种新的大分子表面处理剂（LMPB—g—MAH），并用其对纳米氮化铝粉体进行表面修饰。对合成的接枝共聚物，改性前后的纳米AIN运用IR、TEM、TGA、粒径分析、接触角、沉降实验等方法进行了表征。实验结果表明：马来酸酐（MAH）已经接枝到低分子量的聚丁二烯液体橡胶（LMPB）分子长链中；当马来酸酐（MAH）的接枝率为9％～11％，用量为10％-12％时，处理后的纳米AIN粉体，颗粒粒径最小，有效阻止了纳米颗粒的团聚。当改性后的纳米A1N以0．2％（质量分数）分散于长城润滑油（H-286）中，可明显提高其抗磨减摩性能及承载能力，极压值由1000N提高为1376N。

According to the molecular design, a new graft copolymer macromolecular coupling agent （LMPB - g - MAH） was synthesized by grafting maleic anhydride （MAH） onto the low - molecular - weight polybutadiene liquid rubber （LMPB） with solution polymerization, and it was used as a surface modifier to modify AIN nano- particles; IR, particle size analysis, TEM, TGA, contact angle experiments and the dispersion stabilization were used to study LMPB - g - MAH and nano - AIN. The test results showed that MAH has grafted onto LMPB; The optimum graft degree （GD %） and loading are 9% - 11% and 10% - 12% respectively to modify the A1N nano - particles with LMPB - g - MAH. When the loading of the modified AIN nano - particles is 0.2 wt%, the antifriction performance and the load capability of Changcheng lubricating oil （H- 286） is improved obviously, and PB is increased highly from 1000 N to 1376 N.