US3099545A - Buffing wheel - Google Patents

Description

United States Patent 3,099,545 BUFFING WHEEL Richard S. Johnson, 1032 S. 42nd St., Birmingham 5, Ala. N0 Drawing. Filed Feb. 1, 1961, Ser. No. 86,319 2 Claims. (Cl. 51298) This invention relates to bufling wheels made from textile fabrics, and more particularly to buffing wheels that have been treated with a resinous composition.

The bufling wheel of the present invention is particularly characterized in its excellence for buffing aluminum and aluminum alloys.

Some of the prior art bufiing wheels that have been dipped in various resinous compositions are characterized in that the composition causes the fabric of the buffing wheel to become brittle and to break off when the buffing wheel is repeatedly flexed during the buffing operation. This results in a short wheel life, and more importantly these broken bits of coated fabric become part of an excessive head that develops during the buffing operation. This head is a combination of elements that builds upon and coats the outer periphery of the buffing wheel during the buffing operation; it is composed of metallic particles from the article being buffed, bits of frayed fabric from the buffing wheel, granules of abrasive dust supplied during the bufling operation and waxes, tallows and oils from the vehicle carrying the abrasive dust. This excessive head build up, or accumulation of elements, which is characteristic of all prior art bufiing wheels, interferes with the approach of the bufling wheel fabric and the abrasive to the metal being buffed, thus causing inefficiency in the buffing operation. A further disadvantage is that the excessive head causes scratching, tearing and marking off of the metal being buffed, especially in the case of aluminum and aluminum alloys because of their relatively soft character, thus defeating the purpose of the buffing operation, which is the removal of scratches and the production of a smooth surface upon the metal being buffed.

Another and further disadvantage of the dipped buffing wheels of the prior art is excessive fraying of the fabric forming the outer periphery of the buffing wheel, which also causes excessive head build up and short wheel life.

The problems listed above has been solved by the present invention which comprises treating the cotton buffing wheel with a resinous composition, particularly a modified alkyd resin, a mixture of a rosin derivative, a plasticizer and a suitable solvent. The buffing wheel is dipped into the composition, thus impregnating the fabric, coating the yarns and fibers, and cementing the adjacent yarns together. In this manner, the cemented yarns are bound together and become stronger, with greatly reduced fiber breakage. Also, fraying of the fabric on the outer periphery of the buffing wheel is markedly reduced. Since the head build up can only become as thick as the depth of the frayed fabric as measured on the radius of the wheel, the depth of head is correspondingly minimized as the frayed fabric area is reduced. This decrease of the head results in an increased area of con-tact between the metal being buffed, the buffing Wheel fabric and the abrasive that is utilized in bufling, thus resulting in increased bufiin-g efficiency. The lessening of fiber breakage causes fewer bits of broken fabric to be contributed to the head composition, thus tfurther reducing the head build up. Since the above head is made smaller, fewer metallic particles from the article being buffed may accumulate on the head, resulting in less scratching, tearing and marking off of the metal being buffed.

Although prior resinous compositions have to some extent cemented together the adjacent yarns of buffing wheels, none has produced a cotton buflin'g wheel as efficient as may be done by the present invention.

Although the foregoing discussion has been directed to cotton buffing wheels, it will be realized that the present invention is not limited to buffing wheels made from cotton fabric, but also contemplates buffing wheels made from other textile fabrics and arrangements of fibers, both natural and synthetic.

The following are examples of the present invention:

Example I A resinous composition is made according to the following formula, all parts by weight: Component: Percent by weight Pentaerythrita-l ester of modified rosin (the prodnot obtained by the substantially complete esterification, with pentaerythrital, of the rosin acids present in rosin that has been modified by the formation of an adduct with maleic All of the operations are carried out at room temperature, and the composition need not be compounded in any particular order. The composition is stable over a long period of time.

A preformed conventional cotton fabric butting wheel is totally immersed into a vat containing the above composition at room temperature for thirty seconds, and an amount of solution equal to about 25-30% of the weight of the fabric is taken up by the fabric. The buffing wheel is then removed from the mixture and rotated for thirty seconds upon its axis on the same plane and at the same speed at which the wheel will later be operated, for example LOUD-3,000 r.-p.m., depending on the diameter of the wheel. The remaining solvent is then evaporated in a current of air until the buffing wheel is substantially dry.

Example 11 A resinous composition is made according to the formula disclosed in Example I, above.

A pre-formed conventional sisal fabric buffing wheel is totally immersed into a vat containg the above composition at room temperature for thirty seconds, and an amount of solution equal to about 25-30% of the weight of the fabric is taken up by the fabric. The buffing wheel is then removed from the mixture and rotated for thirty seconds upon its axis on the same plane and at the same speed at which the wheel Will later be operated, for example 1,0003,000 r.p.m., depending on the diameter of the Wheel. The remaining solvent is then evaporated in a current of air until the buffing wheel is substantially dry.

It is preferred that the buffing wheel be rotated in the above mentioned manner so that the resinous composition will be evenly deposited over the wheel and a dynamically balanced wheel be produced, although it is not essential. Unbalanced buffin-g wheels will cause excessive wearing of the bearings and journals of buffing machinery.

Advantageous results have been obtained from the above described pentaerythrital ester of modified rosin, but it is contemplated that rosin modified phenolic resins, the pentaerythrital ester of rosin, the modified rosin sold under the trade name Pentacite 1405 by Reichhold Chemicals, Inc., or the modified rosin sold under the trade name Pentalyn 860 by Hercules Powder Company may be substituted therefor. Likewise, the above described styrenated alkyd resin is utilized as the preferred modifier. However, the styrenated alkyd polymer of other oil modified alkyd resins, such as those obtained from reacting castor oil with glycerol and a mixture of phthalic and maleic anhydrides or phthalic anhydride and fumaric acid, or the resin sold under the trade name Styresol 4250 by Reichhold Chemicals, Inc., may be substituted therefor. Further, it is desirable that the oil used in modifying the resin be a non-drying oil rather than a drying oil, because of the inherent danger of spontaneous combustion in using chemical compounds derived from drying oils in textile fabrics.

In addition, the resin should contain 20-60% by weight of reacted styrene and should be chosen from the group of styrenated oil modified alkyd resins that, when cast into thin sheets or films, display superior abrasion resistance and heat stability. Toluene is utilized as the preferred solvent for the solid components in the present invention, because it has the advantage of relatively low toxicity, intermediate evaporation rate, and because of its aromatic character. However, it is contemplated that a xylene-toluene mixture or benzene may be substituted therefor. Castor oil is utilized as the preferred plasticizer, but it is contemplated that dioctyl phthalate, or tris(2,3 dichloropropyl) orthophosphate may be substituted therefor. This latter plasticizer imparts excellent flame retardant properties to the buffing wheel.

While the preferred embodiment of the invention and the preferred manner of practicing the present method have been described, it will be understood that the invention may be embodied in other forms and applied to other methods within the scope of the following claims.

I claim:

1. As a new article of manufacture, a buffing wheel made of cotton textile fabric that has been treated with a composition comprising 15% of a member selected from the group consisting of pentaerythrital ester of modified rosin, rosin modified phenolic resin, pentaerythrital ester of rosin, and modified rosin, 15% of a member selected from the group consisting of styrenated alkyd resin and styrenated alkyd polymer of oil modified alkyd resin, of a solvent selected from the group consisting of toluene, benzene, and xylene-toluene mixture, and 10% of a plasticizer selected =r'ron1 the group consisting of castor oil, dioctyl phthalate, and tris (2,3 dichl'oropropyl) orthophosphate and thereafter dried.

2. As a new article of manufacture, a buffing Wheel made of sisal textile fabric that has been treated with a composition comprising 15% of a member selected from the group consisting of pentaerythrital ester of modified rosin, rosin modified phenolic resin, pentaerythrital ester of rosin, and modified rosin, 15% of a member selected from the group consisting of styrenated alkyd resin and styrenated alkyd polymer of oil modified alkyd resin, 60% of a solvent selected from the group consisting of toluene, benzene, and xylenetoluene mixture, and 10% of a plasticizer selected from the group consisting of castor oil, dioctyl phthalate, and tris (2,3 dichloropropyl) orthophosphate and thereafter dried.

References Cited in the file of this patent UNITED STATES PATENTS 2,060,665 Durant et al Nov. 10, 1936 2,851,379 Staudinger et a1 Sept. 9, 1958 2,890,137 Vaughan et al. June 9, 1959 UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION Patent No. 3 o99 545 July 3o 1963 Richard S, Johnson It is hereby certified that error appears in the above numbered patent requiring correction and that the said Letters Patent should read as corrected below.

In the grant, lines 1 to 3 for "Richard SQ Johnson of Birmingham Alabama read Richard S. Johnson of Birmingham Alabama, assignor by mesne assignments to Jackson Buff Corporation, of Conover North Carolina a corporation of North Carolina line 12, for "Richard S. Johnson his heirs read Jackson Buff Corporation its successors in the heading to the printed specification line 3 for "Richard S. Johnson, 1032 5. 42nd St., Birmingham 5 Ala," read Richard S. Johnson, Birmingham, Ala. assignor by mesne assignments to Jackson Buff Corporation Conover, NO C. q a corporation of North Carolina column 1, line 43, for "has read U have column 2 line 22, for "anhydride" read anhydrides line 419 for "containg" read containing Signed and sealed this 12th day of May 1964.

(SEAL) Attest:

ERNEST W, SWIDER EDWARD Jn BRENNER Attesting Officer Commissioner of Patents