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Solid lubricant formulations containing starch‐soybean oil composites
Author(s) -
Biresaw G.,
Erhan S. M.
Publication year - 2002
Publication title -
journal of the american oil chemists' society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.512
H-Index - 117
eISSN - 1558-9331
pISSN - 0003-021X
DOI - 10.1007/s11746-002-0476-8
Subject(s) - lubricant , materials science , composite material , dry lubricant , composite number , starch , raw material , soybean oil , sheet metal , food science , chemistry , organic chemistry
Starch‐oil composites comprising purified foodgrade corn starch (PFGS) and soybean oil (SBO) were investigated as potential ingredients for water‐based solid lubricant formulations. Current solid lubricants are almost exclusively petroleumbased and are used for protecting sheet metal and/or as sheet metal forming lubricants. Starch‐oil composites are preferred ingredients for formulating solid lubricants because they are based on renewable and abundantly available raw materials and also have superior environmental and health characteristics. Steel sheets coated with the PFGS‐SBO containing solid lubricant were evaluated for boundary coefficient of friction (COF) and wear properties using ball‐on‐flat test geometry. The COF was highly dependent on the SBO to PFGS ratio in the composite. In the absence of SBO, the COF was high (≈0.8) and decreased sharply with increasing SBO content to a minimum value of 0.07. Wear evaluation showed no scratches or lubricant transfer on the ball. There were also no wear tracks observed on the flat sheet before or after the solid lubricant was washed off. It was concluded that waterbased solid lubricants formulated with the PFGS‐SBO starch‐oil composite have acceptable friction and wear properties and should be evaluated further for use in sheet metal forming.