Solid anti-friction devices – materials therefor – lubricant or se – Lubricants or separants for moving solid surfaces and... – Organic -co- compound
Reexamination Certificate
2001-07-02
2003-08-12
Howard, Jacqueline V. (Department: 1714)
Solid anti-friction devices, materials therefor, lubricant or se
Lubricants or separants for moving solid surfaces and...
Organic -co- compound
C508S513000, C508S579000
Reexamination Certificate
active
06605575
ABSTRACT:
TECHNICAL FIELD
The present invention relates to a water-soluble cutting oil composition among cutting/grinding oils for use mainly in cutting and grinding of metals.
BACKGROUND ART
Heretofore, water-soluble surfactants have been widely used as water-soluble cutting oils, but owing to their inherent characteristics, aqueous solutions thereof are apt to produce foam. Therefore, some problems frequently occur in their applications for cutting or grinding where such foaming should be avoided. For the purpose of preventing such foaming, it has been conducted to add to such water-soluble cutting oils, a hydrocarbon, an animal or vegetable oil, a fatty acid ester, a long chain alcohol, the calcium salt of a fatty acid, a silicone oil or the like, but there exist problems that these additives remain on the surface of the material which has been cut, and the like.
That is to say, Japanese Patent Application Laid-Open (Kokai) No. 330098/'94 discloses fatty acids or fatty acid soaps as antifoaming agents, and Japanese Patent Application Laid-Open (Kokai) No. 15305/'98 discloses mixed fatty acid acylalkylene oxides for the same purpose. However, such antifoaming agents are insoluble in an aqueous surfactant solution and remain on the surface of the cutting machine or the surface of the material which has been cut, so that they might cause the corrosion of the metal. Moreover, even in the case where a silicone oil has been solubilized as described in Japanese Patent Application Laid-Open (Kokai) No. 151284/'76, it is difficult to completely remove the silicone oil by washing, owing to the high adhesiveness of the Si ions, which might, in turn, cause an adverse influence on another working step and lead to quality deterioration such as the occurrence of rust.
As water-soluble cutting/grinding oils (i.e., water-soluble cutting/abrading oils) having an antifoaming ability, Japanese Patent Application Laid-open (kokai) No. 119925/'90 discloses a water-soluble surfactant composition using concurrently both a castor oil fatty acid salt and a carboxylic acid salt, and Japanese Patent Application Laid-Open (Kokai) No. 277536/'90 discloses a salt of the condensate of an oxycarboxylic acid. However, it is necessary to extremely heighten the pH for the preparation of their aqueous solutions, and therefore, there is caused such problems that alkali corrosion tends to occur on metals, printed boards and the like. Moreover, the fatty acids are poor in hard water resistance (i.e., they tend to be precipitated as their salts from hard water), and the fatty acid calcium salt remains sometimes on the cutting machine and the material which has been cut. Furthermore, they possess inconveniences in handling such as bad smell, eruption of the skin, and the like.
As water-soluble cutting/grinding oils having an excellent metal corrosion-preventing effect, acylamino acid salts such as acylglutamic acid salts are disclosed in Japanese Patent Application Laid-Open (Kokai) No. 90645/'74 and Japanese Patent Publication (Kokoku) No. 46745/'76. They have lubricity, washing ability, and solubility and are excellent in skin irritation (i.e., very low in skin irritation), but has a problem of insufficient antifoaming ability. Japanese Patent Application Laid-Open (Kokai) No. 39177/'82 describes an attempt to enhance antifoaming ability with the use of a branched acylamino acid (i.e., an acylamino acid whose acyl group is a branched-chain acyl group, which attempt however results in not always satisfactory results.
Japanese Patent Application Laid-Open (Kokai) No. 59696/'97 discloses as a cutting fluid, a surfactant composition comprising an anionic surfactant of sulfate ester-type, carboxylic acid-type, or the like and a nonionic surfactant of Pluronic-type polyether or the like. However, their antifoaming ability is insufficient, and a cutting agent composition containing the sulfate ester-type anionic surfactant disclosed solely as anionic surfactant in the Examples of the patent document, has a poor antirust ability, so that it is necessary to add an antirust.
DISCLOSURE OF THE INVENTION
It is an object of the present invention to provide a cutting oil composition having antifoaming ability, solubility, lubricity, antirust ability, and washing ability, and excellent in safety and biodegradability, as well as easy to handle.
As a result of extensive and intensive studies in view of such circumstances, the present inventors have found that the above object can be achieved by the combined or concurrent use of an N-acylamino acid having a long chain acyl group (i.e., an N-acylamino acid whose acyl group is a long chain acyl group) and/or a salt thereof, or an N-alkylamino acid having a long chain alkyl group (i.e., an N-alkylamino acid whose alkyl group is a long chain alkyl group) and/or a salt thereof (Component (A)) and an acylalkylene oxide and/or an alkylalkylene oxide (Component (B)), and thus have accomplished the present invention.
Namely, the present invention relates to a cutting oil composition comprising the following Components (A) and (B):
Component (A); one or two or more selected from the group consisting of an N-acylamino acid having a long chain acyl group and/or a salt thereof, or an N-alkylamino acid having a long chain alkyl group and/or a salt thereof, and Component (B); an acylalkyiene oxide and/or an alkylalkylene oxide.
The present invention will be explained in greater detail below.
As examples of an N-acylamino acid having a long chain acyl group as component (A) according to the present invention, there may be mentioned N-acyl acidic amino acids such as N-acylglutamic acids, N-acylaspartic acids, N-acyl-homocysteic acid, and the like; N-acyl neutral amino acids such as N-acylglycines, N-acylalanines, N-acyl-&bgr;-alanines, N-acylthreonines, N-acylserines, N-acylphenylalanines, and the like; N-acyl-N-alkyl acidic amino acids such as N-acyl-N-methylglutamic acids, N-acyl-N-methylaspartic acids, N-acyl-N-methylhomocysteic acids, and the like; N-acyl-N-alkyl neutral amino acids such as N-acyl-N-methyl-&bgr;-alanines, N-acylsarcosines, and the like; diacyl basic amino acids such as diacyllysines, diacylornithines, and the like; and the like. These can be used regardless of their optical isomerism.
Among these acylamino acids, N-acylglutamic acids, N-acylaspartic acids, N-acylglycines, N-acylalanines, N-acyl-&bgr;-alanines, and N-acyl-N-methyl-&bgr;-alanines are preferred from the viewpoints of safety and solubility. Further, from the viewpoint of antifoaming ability and washing ability, N-acylglutamic acids and N-acylaspartic acids are preferred, and N-acylglutamic acids are most excellent. The reason why these acyl acidic amino acids are particularly excellent in washing ability is considered to be because fine metal powder particles formed upon cutting are trapped by the chelating effect of the two carboxylic groups of the acidic amino acid moiety, which results in that they are easily dispersed into the cutting oil without remaining on the surface of the material which has been cut, so that they are easily washed away with water and the like after the use.
The number of carbon atoms of the acyl group of an N-acylamino acid having a long chain acyl group, of Component (A) according to the present invention is preferably from 8 to 18, more preferably from 10 to 14. When the number of carbon atoms is less than 8, N-acylamino acids are observed to be decreased both in washing ability and safety. When the number of carbon atoms is larger than 18, they are decreased in solubility, and the stability of the resulting cutting oil composition therefrom sometimes decreases at low temperatures. Particularly preferred are lauroyl group having 12 carbon atoms and the acyl group of coconut oil fatty acid containing lauroyl group as the main component.
As examples of an N-alkylamino acid having a long chain alkyl group as Component (A) according to the present invention, there may be mentioned N-alkyl acidic amino acids such as N-alkylglutamic acids, N-alkylaspartic
Ajinomoto Co. Inc.
Howard Jacqueline V.
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