Cleaning and liquid contact with solids – Processes – For metallic – siliceous – or calcareous basework – including...
Reexamination Certificate
2000-03-30
2001-06-05
Carrillo, Sharidan (Department: 1746)
Cleaning and liquid contact with solids
Processes
For metallic, siliceous, or calcareous basework, including...
C134S002000, C134S019000, C134S022170, C134S022190, C134S032000, C134S034000, C134S036000, C134S040000, C134S042000, C510S247000, C510S252000, C510S421000, C510S495000
Reexamination Certificate
active
06240935
ABSTRACT:
BACKGROUND OF THE INVENTION
This invention is in the field of water-base alkaline cleaning solutions that are used to descaled and derusted objects made of steel and other iron alloys. The soiled object that needs to be descaled and derusted, for example a drill bit, may be contaminated with a water-insoluble machining lubricant and a smut consisting generally of machining lubricant and small metal particles congealed together. Conventional water-base alkaline cleaning solutions do not have the ability to completely dissolve machining lubricants. The present invention has this ability.
An example of a widely-used water-insoluble machining lubricant is a machining lubricant manufactured by The Orelube Corporation, of Plainview, N.Y. 11803, and sold under the trademark BOELUBE® 70106. This product, BOELUBE® 70106, is a long chain alcohol-base machining lubricant, which is a free flowing, water-insoluble liquid at room temperature. Further information about the composition of BOELUBE® 70106 may be found in its Material Safety Data Sheet of Aug. 6, 1997 which is incorporated by reference herein.
BRIEF SUMMARY OF THE INVENTION
In one aspect the invention is an improved alkaline cleaning solution that has the ability to descale, derusted, and completely dissolve machining lubricants (such as BOELUBE® 70106) coated on steel and other iron alloy objects, the alkaline cleaning solution consisting essentially of: (a) water; (b) about 2.5% to 25% by weight of a water-soluble strong alkali; (c) about 2% to 8% by weight of a water-soluble sequestering agent selected from the group consisting of sodium gluconate and its functional equivalents; (d) about 5% to 20% by weight of a water-soluble complexing agent selected from the group consisting of sodium xylene sulfonate and its functional equivalents; and (e) about 2% to 20% by weight of a water-soluble surfactant selected from the group consisting of NEODOL 91-6 and its functional equivalents.
In another aspect the invention is a process for descaling, derusting, and completely dissolving and removing machining lubricants coated on steel and other iron alloy objects, the process comprising the steps of: (a) providing an alkaline cleaning solution consisting essentially of: water; about 2.5% to 25% by weight of a water-soluble strong alkali; about 2% to 8% by weight of a water-soluble sequestering agent selected from the group consisting of sodium gluconate and its functional equivalents; about 5% to 20% by weight of a water-soluble complexing agent selected from the group consisting of sodium xylene sulfonate and its functional equivalents; and about 2% to 20% by weight of a water-soluble surfactant consisting of NEODOL 91-6 and its functional equivalents; and (b) contacting the soiled object with the alkaline cleaning solution at a temperature of about 60° F. to 200° F. for about 3 to 30 minutes, whereby the object is descaled, derusted, and the machining lubricant is completely dissolved and removed.
DETAILED DESCRIPTION OF THE INVENTION
The BOELUBE® dissolving alkaline cleaning solution of the present invention is a water-based mixture consisting of a water-soluble surfactant, a water-soluble complexing agent, a water-soluble sequestering agent, a strong alkali, and water. The present invention will completely dissolve and remove a water-insoluble machining lubricant, such as BOELUBE® 70106 (hereafter referred to as “BOELUBE®”), from objects made of steel and other iron alloys, for example, steel drill bits that have been used in drilling and that have become contaminated with machining lubricant and a smut generally consisting of machining lubricant and small metal particles congealed together. Complete solubilization of the machining lubricant is achieved by using the improved water-base alkaline cleaning solution consisting of a water-soluble surfactant, a water-soluble complexing agent, a water-soluble sequestering agent, a strong alkali, and water. It is designed to descale steel and other iron alloys. The present BOELUBE® dissolving alkaline cleaning solution can also be used on other tools (such as reamers, saws, broachers, grinders, taps, millers, thread cutters, deburrers, punches) that have become coated with machining lubricant and smut.
The preferred water-soluble surfactant is the surfactant sold under the trademark NEODOL 91-6 by Shell Oil Co., P. O. Box 4320, Houston, Tex. 77210, or its functional equivalent. This slightly viscous liquid product contains C9-C11 alcohol ethoxylates and 6 ppm of ethylene oxides. The concentration of NEODOL 91-6 added to the cleaning solution may vary between about 2% to 20% by weight. The preferred concentration of NEODOL 91-6 is 5% by weight.
The preferred water-soluble complexing agent added to the cleaning solution is sodium xylene sulfonate or its functional equivalent. The concentration of the complexing agent may vary between about 5% to 20% by weight. The preferred concentration of the complexing agent is 12% by weight.
The ratio between surfactant and complexing agent is important in the proper functioning of the present cleaning solution. The preferred ratio of surfactant to complexing agent is 5:12 by weight.
The preferred water-soluble sequestering agent is sodium gluconate or its functional equivalent. The concentration of the sequestering agent may vary between about 2% to 8% by weight. The preferred concentration of the sequestering agent is 5% by weight.
The preferred strong alkali is sodium hydroxide. The concentration of the strong alkali may vary between about 2.5% to 25% by weight. The preferred concentration of the strong alkali is 7.5% by weight.
The metal build-up and dust from mechanical operations results in metal ions in the alkaline cleaning solution. The metal ions (such as aluminum ions) must be tied up to prevent them from interfering with the cleaning and to prevent redeposition on the object to be cleaned. The sequestering agent (such as sodium gluconate) keeps the metal ions soluble and away from the object to be cleaned.
There are numerous other commercially available alkaline cleaning agents intended to remove common oil and smut on metals. However, they were unsuccessful in completely removing the machining lubricant BOELUBE® and the smut generally consisting of the machining lubricant and small metal particles congealed together. The improved alkaline cleaning solution of this invention will completely dissolve and remove the machining lubricant BOELUBE® and the smut.
The soiled object to be cleaned should be in contact with the alkaline cleaning solution at a temperature of about 60° F. to 200° F. for about 3 to 30 minutes, whereby the object is descaled, derusted, and the machining lubricant is completely dissolved and removed.
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The Orelube Corporation, web page at www.orelube.com/page3.htm, Boelube® “A Better Way” (one page).
The Orelube Corporation, web page at www.orelube.com/page4.html, Boelube® “Data,” Subject: Boelube® 70104 (100A)/70106 (100F) The Premier Lubricant For Mist Applications. (two pages).
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N. Irving Sax and Richard J. Lewis, Sr. Hawley's Condensed Chemical Dictionary, Eleventh Edition (1987), pp. 1033, 1034 (defenition of “sequestration”),
Carrillo Sharidan
Cullom Paul C.
The Boeing Company
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