Type and Concentration Effects of some Active Ingredients on the Performance of Bentonite Lubricant Grease

1 Mohammad Jamil Abd- Alghani, 2 Bashir Yousif Sherhan2

Collage of Basic Education, Salah Aldin University,  2 Petroleum Engineering Department, University of Technology

Optimization study was carried out on the materials used in preparation of lubricant grease
prepared from bentonite. This study included the selection of the optimum type and percent of
quaternary ammonium salts to convert the bentonite from hydrophilic to organophilic; tetraethyl
ammonium chloride and tetraethyl ammonium bromide were used for this purpose. It was seen that
the quaternary ammonium chloride gave the best results because of the high tendency of calcium
ion to react with chloride ion than that with bromide ion; over more it gave a less swelling.
The effect of treated bentonite added in different percentage on the penetration point, NLGI
(National Lubricating Greases Institute number), drop point, and water resistance of the prepared
grease was studied. It was seen that by increasing the percentage of added organophilic bentonite
with the prepared grease caused a decrease in the penetration point which is correspond to increase
in the consistency of stiffness of grease. These results were in agreement with the NLGI
classification system. It was noticed that by increasing the percentage of added organophilic
bentonite in the prepared grease caused an increase in the dropping point and in the degree of
water resistance.

Key words: Bentonite, NLGI, Grease Washout.

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