预制法制备四聚脲润滑脂的工艺研究

STUDY ON PREPARATION OF TETRAUREA LUBRICATING GREASE BY PREFABRICATION METHOD

考察了预制法制备工艺条件对四聚脲润滑脂性能的影响,优化了制备工艺,并探讨了制备过程机理,阐述了润滑脂宏观性能与微观结构之间的关系。优化的工艺条件及制备过程为:在50~70℃下反应30 min后得到四脲稠化剂;将四脲稠化剂加入到基础油中,搅拌并升温至170~180℃,恒温炼制1.5 h,冷却、研磨均化,得到四聚脲润滑脂。润滑脂性能分析结果表明,由轻度精制环烷基基础油、质量分数20%四脲稠化剂、质量分数0.8%极压抗磨剂制备的四聚脲润滑脂,滴点达320℃,工作锥入度为286(0.1 mm),钢网分油率为0.86%,且其他性能均满足极压聚脲脂质量标准SH T 0789—2007的要求。

The influence of the preparation conditions on the basic properties of tetraurea grease using prefabrication method was investigated,the mechanism of the preparation process was discussed from the perspective of the structure-activity relationship,and the relationship between the macro-properties and the micro-structure was understood.The optimized preparation conditions and basic steps were as follows:reacting at 50-70℃for 30 min,a tetrauret thickener was obtained,which was added to the base oil,stirred and heated to 170-180℃,and refined at constant temperature for 1.5 h,the tetrapolyurea grease was obtained after cooling and grinding.The results of performance analysis of lubricating grease showed that the tetrapolyurea grease was prepared from the lightly refined naphthenic base oil,20%tetrapolyurea thickener by mass and 0.8%extreme pressure antiwear agent by mass.The drop point,working cone penetration and oil separation rate of the prepared tetrapolyurea grease were 318℃,281(0.1 mm)and 0.83%,respectively,and the other properties,such as water resistance,similar viscosity,oxidation stability,extreme pressure and wear resistance,met the quality standard SH T 0789—2007.