US1758265A - Lubricant - Google Patents

Description

Patented May a 1930 UNITED s AT s PATENT. OFFICE- SAMUEL '1. SHE-BRICK, 01 DENVER, COLORADO, ASSIGNOR TO EDWIN S. KASSLER, 3B,,

AND THOMAS P. CAMPBELL, TRUSTEES, OF DENVER, COLORADO No Drawing.

This invention relates to a composition of matter particularly adapted for use as a lubricant of the kind commonly known as hard oil or packing grease. v

An object of the inveninon is-to provide a lubricant which is of simple composition and which by reason of the cheapness and abundance of its principal ingredient can be produced at very low cost.

Another object is to provide a lubricant having high stability, both physical and chemical, and a further ob ect is to prov de a hard oil or packinggrease havinghigh lubricant power and'capable of forming a film of great compressive strength.

With the above and other objects vlew, the composition has as its principal ingredient,-a colloidal or jelly-formlng clay such as bentonite (AlgO3-6SiO2-5H20) or other hydrated silicate of aluminum. v

The composition involves the use of a plastic mineral substance having as components,

a gelatinous colloid, a mineral salt and a water insoluble clay in a state of fine subdivision. Bentonite or other clay of similar nature lends itself particularly to the production of the desired substance. To still better adapt the colloidal clay for use in preparing a composition of the above-stated character it is subjected to an acid treatment for the production of ortho-silicic acid.

The natural clays contain a considerable.

amount of combined silicic acidand by treating the material with a comparatively stronger acid, part or all of the silicic acid may be displaced and precipitated, in acidic environment, as gelatinous ortho-silicic acid w mq Sulfuric acid is well adapted for the acid treatment of the clays although other acids,-

particularly those which form a water soluble salt of aluminum, such as hydrochloric or glacial acetic may be used in variant proportions with satisfactory results.

The clays after the acid treatment yield a compound of colloidal clay, aluminum sulfate, ortho-silicic acid and water that meets all the requirements for the production of a lubricant of the hereinbefore described properties.

App1ication filed October 25, 1927. 'Serial No. 228,697.

The lubricant has for its other ingredients water and lubricating oil and its components in a desirable form are mixed in the following proportions: Bentonite 7 parts, water 7 parts, and lubricating oil 12 parts.

If the colloidal clay is subjected to an acid treatment the proportions may be as-follows:

Parts Bentonite v -,-S ulfuric acid (concentrated C. P.) 1 ater 5 Lubricating oil 12 The first three ingredients are mixed thoroughly to' form a homogeneous pulp afterwhich the engine oil is added.

Every efi'ort must be made to attain a very fine state of subdivision of solids, which may be accomplished by grinding the pulp in a pebble mill in more than enough oil to saturate the clay. The oil in excess of the amount that can be held b the clay used then may be removed in a ter press.

It is possible to use for the oil ingredient of the composition, low grade lubricating oils and crank casedrainings and as a general rule, mineral oils are better adapted for the urpose than animal or vegetable oils.

aving thus described my invention, what I claim and desire to secure by Letters Patcomposition consisting in grinding a pulpous mixture of colloidal clay, an acid stronger than silicic acid thereby producing orthosilicic acid and water to a fine state of subdivision of solids, in the presence oflubrieating oil, and removing the excess oil by filtration.

6. A lubricant containin colloidal clay, water, ortho-silicic acid, uminum sulfate and lubricating oil.

7. A lubricant composition com rising a gelatinous colloidal clay treated wit an acid 5 stronger than silicic acid whereby the latter is displaced as ortho-silicic acid, water and lubricating oil.

8. A lubricant comprising a gelatinous colloidal clay treated wlth s furlc acid, water and lubricating oil.

'9. A lubricant composition comprising bentonite treated with an acid stron er than silicic acid whereb the latter is splaced 16 aial ortho-silicic aci water and. lubricating o 10. The herein describedfprocess com risin the treating of aluminum silicate wit an acid stronger than silicic acid, thereby producing ort o-silicic acid, and mixing it with water and lubricating oil.

11. A lubricant compositionvcomprising a colloidal clay containing displaced ortho-silicic acid, water and lubricatmg oil.

In testimony whereof I have afiixed my gn SAMUEL T. SHERRICK.