JPH10168470A - Water-soluble cutting oil - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a solution type cutting oil having cutting performance at least equal to that of an emulsion type cutting oil by using a salt of an oxidized low-molecular polyethylene as the principal component. SOLUTION: This cutting oil contains an alkali metal salt, ammonium salt or amine salt of an oxidized low-molecular polyethylene. The oxidized low- molecular polyethylene salt is obtained by forming an alkali metal salt, ammonium salt or amine salt from polar groups, such as OH and COOH groups, of a modified ethylene polymer produced by polymerization or decomposition and having an average molecular weight of about 500 to 10,000 and making it soluble in water to form a translucent solution. The oxidized low-molecular polyethylene salt has an effect of reducing friction and is preferably used as a mixture with a lubricant, an extreme-pressure additive, a surfactant, a rust preventive, an antiseptic agent, an antifoaming agent, etc., although it can be singly used as a cutting oil as it is. It is effective to form the salt by using sodium, potassium, ammonia or an alkanolamine.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water-soluble cutting oil, and particularly to a conventional emulsion oil (JIS classification W1).
Solution type fluid (JIS Class W2) with performance equal to or better than the processing performance (cutting ability) of
It is about.

[0002]

2. Description of the Related Art Conventionally, a water-soluble cutting fluid is generally used for cutting, an emulsion type having excellent machinability is used for cutting, and a solution type having excellent cooling and cleaning properties is generally used for cutting. In addition, water-soluble cutting fluids are also valued for secondary performance aspects such as rust resistance, rot resistance, defoaming properties, and liquid life. Emulsion-based fluids have excellent cutting properties, but on the other hand, Has disadvantages.

[0003] (1) Rot of liquid due to mixing of machine oil, etc. (2) Stickiness and dirt around the machine (3) Washing load of the work is large On the other hand, there are many solution type oils which solve the above-mentioned disadvantages. Since the primary performance (cutting property) is inferior to that of an emulsion type oil, it cannot be used particularly in difficult cutting such as reaming of aluminum parts.

[0004]

Means for Solving the Problems As a result of intensive studies, the present inventors have found that an alkali metal salt, an ammonium salt or an amine salt of oxidized low molecular weight polyethylene (hereinafter simply referred to as "oxidized low molecular weight polyethylene salt") is contained. The present invention has been found that a solution type oil solution to be obtained can obtain the same or higher machinability as compared with an emulsion type oil solution, and has reached the present invention.

Hereinafter, the present invention will be described in detail. The oxidized low-molecular-weight polyethylene salt constituting the present invention is obtained by converting a polar group such as an OH group or COOH group of a modified ethylene polymer having an average molecular weight of about 500 to 10,000 obtained by a polymerization method or a decomposition method into an alkali metal salt or an ammonium salt. Alternatively, it is an amine salt which can be translucently solubilized in water.

[0006] This component has a friction reducing effect (Japanese Patent Application No. Hei.
197455) Although it may be used alone as a cutting oil as it is, it is better to add an oil agent, an extreme pressure agent, a surfactant, a rust inhibitor, an antiseptic, an antifoaming agent, etc. to make a cutting oil. desirable. At this time, the effective composition ratio of the oxidized low molecular weight polyethylene salt is difficult to determine in relation to other components used in combination, and is determined appropriately. It is to be noted that sodium or potassium is effective as an alkali metal source of the oxidized low molecular weight polyethylene salt, ammonia is effective as an ammonium source, and alkanolamine is effective as an amine source.

[0007]

Next, examples of the present invention will be described in order to demonstrate the effects of the present invention. However, the present embodiment does not limit the present invention at all. Table 1 shows Examples 1 to 3,
The composition or contents of Comparative Examples A to D are shown.

[0008]

[Table 1] Table 2 shows the results of the secondary performance comparison of Examples 1 to 3 and Comparative Examples A to D, and Table 3 shows the results of the machinability in actual machines.

[0009]

[Table 2] * 1. Cast iron swarf test method Cast iron swarf (FC-25) is immersed in a test solution, taken out into a petri dish covered with filter paper, covered with a lid, and then observed for rusting over time.

Judgment method 方法: no rusting ○: rusting at several points △: tens of points rusting ×: rusting on 1/2 surface or more Corrosion resistance evaluation method 100 ml of test liquid, 2 g of corn powder, and cast iron chips 5
g, 1 ml of spoilage solution and 5 ml of machine oil
It is allowed to stand in an atmosphere of 0 ° C., and the daily pH change and the number of bacteria are examined.

* 3. Foamability evaluation method 80 ml of the test solution was placed in a 100 ml stoppered cylinder, shaken vigorously more than 10 times, and the amount of foam (m
Check l).

* 4. Oil Separability Evaluation Method 80 ml of the test solution and Balatra No. 2 (Mobil Petroleum Co., Ltd.) 5 ml, stopper and shake vigorously more than ten times, and then examine the amount (ml) of the oil layer and cream layer separated after standing and the transparency of the lower liquid part.

[0013]

[Table 3] The above results demonstrate that Examples 2 and 3 are solution type oils having excellent cutting workability as compared with Comparative Examples A to D.

[0014]

As described above, the water-soluble cutting oil containing the oxidized low-molecular-weight polyethylene salt of the present invention has a cutting performance (lubricating performance) equivalent to or higher than that of the emulsion type. It can be a solution type oil agent having

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Claims (1)

[Claims] 1. A water-soluble cutting oil containing an alkali metal salt, ammonium salt or amine salt of oxidized low molecular weight polyethylene.