RESEARCH ON HIGH TEMPERATURE ADDITIVES FOR LUBRICANTS.
Abstract
Tetraphenyltin and bis(p-phenoxyphenyl)diphenyltin perform well as antioxidants for polyphenyl ethers at 600-650 F in Bearing Rig test ratings. p-Bis(triphenylstannoxy)benzene is a third member of the organotin compounds screened that is an effective antioxidant for polyphenyl ethers. Other antioxidants that are effective for polyphenyl ethers are the metal salts of N,N-diphenyldithiocarbamic acid, triphenylbismuth and the oxides of copper. The most outstanding EP additive is diphenyltin bis(trichloroacetate) with an EP weld point greater than 720 kg. Testing a variety of lubricants in a modified Shell Four Ball apparatus (modified to detect metal-to-metal contact electrically) permits following the change from hydrodynamic to boundary type lubrication with increase in loading. A tentative mechanism is proposed to explain the results of controlled oxidations of m- and p-bis(phenyl) benzenes - oxidation of polyphenyl ethers is accompanied by bond breaking (phenyl-oxygen) and coupling or condensation of intermediate to form higher molecular weight compounds. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 01, 1962
- Accession Number
- AD0281831
Entities
People
- Glenn R. Wilson
- John O. Smith
Organizations
- Monsanto