US2847290A - Anti-slaking buffing compositions - Google Patents

Description

t because of the short storage life.

United States Patent Ofifice,

2,847,290 a e t d A 9.58

2,s 47,290 ANI-I-SLAKING BUFFING coivirosmoNs Byron E. Marsh, Brookfield, and Richard L. Betcher,

Chicago, 111., assignors to Armour and Company, Chicago, 111., a corporation of Illinois No Drawing. Application April 10, 1957 Serial No. 651,828

6 Claims. c1. 51-304 This invention relates to improved buffing positions. In one of its aspects, this invention relates to lime bufling bars having improved anti-slaking properties.

Conventional bufiing compositions in use for butting nickel, nickel alloys, copper, brass, zinc, aluminum, etc., have proven unsatisfactory in many respects. Such compositions usually contain lime and are used in the form of bars. In use these bars are rubbed against the butting wheel and the abrasive is applied to the wheel by melting binder brought about through the heat of friction.

The production of lime compositions has caused problems in the buifing industry for years. An insoluble lime soap is often formed when mixing the calcium and magnesium oxide abrasives and the fatty acid binder in the presence of moisture. When this occurs in the kettle it is necessary to break the hard cellular soap into pieces that can be usually removed, since heat will only char the soap, not melt it. In addition to soap formation, the most pressing problem from a consumer point of view is slaking. This term is used to describe the hydration of the hard oxides to the soft hydroxides in the presence of atmospheric moisture and normally takes place within one to three weeks after formation of the lime bar unless an airtight container is used for storage of the composition. As hydration occurs the slaked lime reacts with the fatty acid binder and the bar flakes and eventually crumbles. In this condition of course it cannot be used in bufiEing operations. problem somewhat by the use of quality controlled materials, close supervision in manufacture, and the use of expensive airtight containers similar to the vacuum sealed food containers. However, even with these precautions, storage of lime bars for any length of time is not practiced and orders are filled only when received. It is obvious, therefore, that there exists a need for an anti-slaking additive in lime bufling compositions.

In accordance with the present invention we have provided an anti-slaking additive for lime buffing compositions which enables bufling ba compounders to produce bars for stock, which they have been unable to do before This makes possible easier production scheduling and the preparation of larger sized batches. Also, it enables the use of a cheap paper container in place of an' expensive airtight metal container or foil.

Our anti-slaking additives are N-aliphatic-trimethylene diamines which can be represented by the structural formula RNHCH CH CH NH wherein R is an aliphatic hydrocarbon radical containing from 8 to 22 carbon atoms. Examples of aliphatic radicals coming within the definition of R include octyl, decyl, dodecyl, tetradecyl, hexadecyl, octadecyl, octadecenyl, octadecadienyl, octadecatrienyl, and statistical mixtures of the foregoing radicals as are contained in naturally occurring oils and fats such as tallow, soybean oil, coconut oil, and the like. The mixture of aliphatic hydrocarbon radicals contained in tallow is comprised of approximately 45% by weight of octadecenyl, 25% octadecyl, and 30% hexadecyl radi- The industry has alleviated the v .2. e x mp e f-p efer d at ak n dd t r s nd d N-tallow -trimethylene diamine, Neoctadecyl-trirnethylene am ne N sxa e y msth c d ami e.

The improved ;anti slaki ng by lime bulfing compositions of he ssm n Q wnt -n. Q abou o 89% by weight of lime, such as Vienna lime, as the abrasive element, from about 12 to 18% of a saturated fatty acid having a titer of at least 40 C., preferably'having an iodine value not in excess of 7.0, from about 12 to 18% of an animal or vegetable oil glyceride, and from about 1.5 to about 5.0%, preferably about 5.0% of our antislaking additive as described above. If desired, the abrasive element can contain in addition to the lime conventional materials such as emery, silicon carbide, tripoli, or the like.

The bufiing compositions of the present invention can be prepared by blending together the anti-slaking additives, saturated fatty acid, and animal oil at a temperature of about 190 F. after which the abrasive material is added to the molten material with mixing until a smooth mixture is obtained. The molten paste can then be put into forms and allowed to cool and harden.

The following example Will illustrate this invention in the manner in which it may be practiced, but it is to be understood that this example is not to be construed as unduly limiting:

1 Example Three series of two bufiing bars, A and B, were prepared and observed under difierent storage conditions for slaking. The bars were prepared in the manner described above. Bar A contained 15% by weight of stearic acid having a titer of 54 C. and an iodine value of 7, 15% acidless tallow and 70% lime composed of 50% CaO and 50% MgO. Bar B contained 15% by weight of stearic acid having a titer of 54 C. and an iodine value of 7, 15% acidless tallow, 5% N-tallow-trimethylene diamine and 65% lime composed of 50% CaO and 50% MgO. Each of the bars were stored in unsealed containers.

One group of bars was stored in a humidity cabinet of F. and 93% relative humidity. Bar A slaked in less than 72 hours. Bar B showed no evidence of slaking after 96 hours.

Another group of bars was stored in an air oven at F. Bar A slaked in 6 days. Bar B showed no evidence of slaking after 38 days.

Still another group was stored under ordinary conditions, but unwrapped. Bar A slaked after 14 days. Bar B showed slaking on the surface only after 38 days of storage.

While this invention has been described and exemplified in terms of its preferred embodiments, those skilled in the art will appreciate that modifications can be made without departing from the spirit and scope of the invention.

We claim:

1. An improved lime bufiing composition containing as an anti-slaking additive from about 1.5% to about 5.0% by weight of a compound having the formula RNHCH CH CH NH wherein R is an aliphatic hydrocarbon radical having from 8 to 22 carbon atoms.

2. An improved lime bufling composition containing as an anti-slaking additive from about 1.5 to about 5.0 weight percent of N-tallow-trimethylene diamine.

3. An improved lime bufiing composition containing as an anti-slaking additive about 5.0% by weight of N-tallow-trimethylene diamine.

4. A lime buffing composition consisting of about 65 to 80% by weight of Vienna lime, about 12 to 18% of a saturated fatty acid having a titer of at least 40 C., from about 12 to about 18% of tallow and 1.5 to about 4 5.0% by Weight of a compound having the formula References Cited in the file of this patent RNHCH CH CH NH wherein R is an aliphatic hydrocarbon radical having from 8 to 22 carbon atoms. UNITED STATES PATENTS 5. A composition according to claim 4 wherein the 2,078,876 I-Iennessey Apr. 27,1937 saturated fatty acid is stearic acid and R is a mixture of 5 2,417,800 Weisser Mar. 18, 1947 aliphatic hydrocarbon radicals as contained in tallOW. 2,482,667 Gray Sept. 20, 1949 6. A lime bufiing composition consisting of about 65% 2,606,829 Chester Aug. 12, 1952 by weight of Vienna lime, 15% stearic acid, 15% aCidl S 2,642,348 Stier June 16; 1953 tallow, and 5.0% of N-talloW-trimethylene diamine.

Claims (1)

1. 6. A LIME BUFFING COMPOSITION CONSISTING OF ABOUT 65% BY WEIGHT OF VIENNA LIME, 15% STEARIC ACID, 15% ACIDLESS TALLOW, AND 5.0% OF N-TALLOW-TRIMETHYLENE DIAMINE.