摘要
针对传统的直接法脲基润滑脂生产工艺中采用的异氰酸酯毒性较大以及易发生二聚反应而影响产品性能稳定的情况,采用预制稠化剂法制备脲基润滑脂,首先筛选出有效的溶剂体系,使有机胺和异氰酸酯进行有效反应,得到基于二脲和四脲的预制稠化剂,进而研制出性能优良的脲基润滑脂,并采用红外光谱对稠化剂的结构、毒性进行分析。结果表明:预制的二脲与四脲稠化剂具有典型的脲基稠化剂结构,同时聚脲分子间的氢键缔合使得红外光谱各吸收峰略有偏移,异氰酸酯的特征峰消失,确保了稠化剂的无毒性;基于预制稠化剂制备的脲基润滑脂具有良好的成脂性和较高的滴点,并具有良好的胶体安定性、氧化安定性和热安定性,轴承漏失小、腐蚀性合格。
In conventional production process of urea-based grease,direct reaction between amines and isocyanates in the base oil is a required step. However,the toxicity of isocyanates poses as a significant challenge for industrial safety. In this paper,a new route of producing polyurea based grease was studied through a two step method. The first step is to prepare polyurea thickener through reacting organic amines and isocyanates in selected organic solvent systems. The obtained thickener was then dried and can be used to prepare polyurea grease. The structure and toxicity of the premade thickener was analyzed by IR,and the results showed that this thickener having the typical structure of polyurea thickener was nontoxic. Polyurea grease prepared with this premade thickener had high drop point and exhibited good colloid stability, as well as thermal and oxidation stability,with low leakage and corrosion when use in bearing.
出处
《石油炼制与化工》
CAS
CSCD
北大核心
2012年第2期71-75,共5页
Petroleum Processing and Petrochemicals
基金
重庆市科技攻关项目(CSTC2009AB4225)
关键词
聚脲润滑脂
稠化剂
预制法
毒性
polyurea grease
thickener
preparation
toxicity
