The properties of several domestic and abroad calcium alkylsalicylates with different TBN which are used as metal detergents were introduced. The structure,distribution and stability of the colloid particles as well as compatibility with high TBN calcium sulfonate were investigated.The results revealed that the structure of colloid particle is an important factor affecting its stability.The smaller the diameter is and the more even particles distribution is,the better performance of colloid stability behave.In addition, the improved medium and high TBN T109 have been manufacturing in LPPCC. These products have excellent compatibility with sulphonates without precipitate after mixing.

The antiwear mechanism of calcium sulfonate as well as several modified metal detergents are described. It is ascertained the antiwear performances of these modified detergents have been improved and the development of antiwear detergents is estimated.

The preparation and properties of a lubricating oil additive, the super-overbased magnesium alkylsalicylate, having a base number of 400 mg KOH/g were discussed focusing on the factors affecting the preparation process. The micelle stability and the structure of the carbonate in the additive were studied by IR absorption spectroscopy. Freeze-etching replication and electron microscopic observation methods were used to measure the diameters and the distribution of the carbonate containing micelles. Four-Ball machine and cam tests were used to investigate the EP anti-wear performance of the additive. The micelle structure of the additive has an important effect on its performance. The smaller micelle diameter and even particle distribution result in improved micelle stability, anti-wear ability, and high-temperature detergence.

The development of mixed-substrate metal detergents is described.And the properties of sulfurized alkylsalicylate and mixed-substrate detergent from alkylsalicylic acid/alkylbenzene sulfonic acid are focused on. These products which are produced by two or more substrates exhibit improvements in performance over traditional sulfonates or salicylates metal detergents,with good prospect.

The preparation and performance of a super over-based calcium alkyl salicylate with a basicity of ≥350mgKOH/g are presented. The compatibility of the super over-based calcium alkyl salicylates, which were prepared in the presence of different co-promoters and over-based calcium sulfonate, was focused on. Infrared absorption method, etc. were used to study the colloidal stability and the carbonate crystal structure of the product. The structure and distribution of the carbonate-containing micelle were observed by freeze-etching replication and electron microscopic observation. Four-ball machine tests were used to study the anti-wear performance of the super over-based calcium alkyl salicylate. The research results showed that the micelle structure of the additive had important influence on the performance of product. The micelle stability and antiwear performance were better when the micellae diameter was smaller and the particle distribution was even. In addition, the high temperature detergency and the oxidation stability of the product were improved accordingly.