Review article
DEVELOPMENT OF LUBRICATING OILS AND THEIR INFLUENCE ON THE SEALS
Elvira Vidović
; Fakultet kemijskog inženjerstva i tehnologije, Sveučilište u Zagrebu, Zagreb, Hrvatska
Abstract
Lubricants industry is going through significant changes due to various influences. On the one hand are the requirements of engines manufacturers, cars and boats regarding improved quality of lubricants, and on the other hand stringent government regulations that concern the industry. The occuring changes reflect inevitably on producers in complementary industries, whereat the seal production is one of the most exposed. The changes in the composition and properties of lubricants, especially lubricating oils, affect their behavior, primarily compatibility in contact with seals. Detailed research shows that the observed interactions are complex and that trends and behavior model can not be unequivocally predicted. The rubbers on the same base, such as NBR, due to the composition differences exhibit significantly different behavior in the oils of the same group, i. e. is the same rubber in various oils shows swelling or shrinkage. This paper classifies the most important types of rubber used for seals and their behavior in contact with products of mineral base, aliphatic, aromatic and chlorinated hydrocarbons, as well as other used for the brake fluids of glycole base, silicone and PAO oils. Seven types of elastomers regarding their compatibility with group I, III, GTL and PAO base oils are compared. For selected examples the influence of esters and additives on the swelling behavior of seals is shown. It was found that the addition of ester causes improvement while addition of swelling additives has a significant influence and the ultimate effect on the swelling / shrinking in group III base oils matches approximately the group I oils.
Keywords
lubricant oil; rubber; seals; elastomer compatibility index; swelling behavior
Hrčak ID:
127916
URI
Publication date:
30.9.2014.
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