Masters Theses

Abstract

"A permeability apparatus was used to measure the permeability coefficients of eight Lithium-Calcium greases and ten Baragel greases in which the viscosity and type of the oil component were varied. The oil present in each grease was used for its permeability measurement.

An improved sample packing technique was developed to improve the repeatability of permeability measurements. Repeatability of ± 3% was achieved. In general the permeability coefficients of the non-soap Baragel greases were higher than those of the lithium-calcium greases with comparable oil components, and those of greases containing paraffinic oils were higher than these containing naphthenic oils. The effect of the viscosity of the oil from which the greases were made on permeability was less certain. With naphthenic oils, permeability increased with increase in viscosity in both the lithium-calcium and the Baragel greases. With paraffinic oils, the permeability coefficient was much less sensitive to oil viscosity for both thickeners.

Another set of experiments aimed at the measurement of the absorption and extraction of small percentages of a grease additive were performed using the same apparatus. One lithium and one Baragel grease were used. Phenyl-α-naphthylamine, the additive used, can be analyzed in the infrared spectrophotometer to concentration levels as low as 0.05%. Experiments in which grease containing additive was extracted by oil without additive were performed and vice versa. Additive mass balances were determined from the infrared analyses.

The amount of additive absorbed at equilibrium by the Baragel grease was greater than for the lithium grease, but the initial rates of absorption were about the same. The Baragel grease absorbed a calculated 1.79% of additive as compared to 0.90% for the lithium grease.

In the additive extraction experiments, grease initially containing 1.38% additive held 0.23% (Baragel) and 0.18% (lithium) in equilibrium with pure oil. The initial rate of extraction was greater for the lithium grease"--Summary and Conclusions, pages ii-iii.

Advisor(s)

Zakin, J. L.

Committee Member(s)

Govier, John P., 1913-1998
Conrad, Frank H., 1902-1983
Scrivner, Jack M., 1929-2004
Wellek, Robert M.

Department(s)

Chemical and Biochemical Engineering

Degree Name

M.S. in Chemical Engineering

Publisher

University of Missouri at Rolla

Publication Date

1965

Pagination

viii, 100 pages

Note about bibliography

Includes bibliographical references (pages 58-59).

Rights

© 1965 Eugene Hsiung-Jen Tu, All rights reserved.

Document Type

Thesis - Open Access

File Type

text

Language

English

Subject Headings

Lubrication and lubricants -- Analysis
Oils and fats -- Absorption and adsorption -- Measurement
Permeability -- Measurement

Thesis Number

T 1761

Print OCLC #

5968560

Electronic OCLC #

803998367

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