JPS6059279B2 - Method for preventing spoilage of cutting oil or rolling oil containing mineral oil - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for preventing spoilage of metalworking oils, particularly cutting oils or rolling oils containing mineral oils.

BACKGROUND ART Conventionally, as a method of preventing metalworking oil from spoiling, organic disinfectants have been added to metalworking oil.

However, even if the anti-corrosion effect of this organic disinfectant is good against specific microorganisms, a sufficient effect may not be obtained depending on the type of microorganism.

Therefore, when using the disinfectant, it was necessary to select an appropriate disinfectant in consideration of the type of target microorganism. Furthermore, some organic disinfectants are themselves decomposed by microorganisms, and such disinfectants are LS does not persist, so fungicides must be added frequently.

The present invention was completed as a result of intensive research to eliminate the drawbacks of the conventional methods.

That is, the present invention applies SnSO to an emulsion-type cutting oil or rolling oil containing mineral oil.

This is a method for preventing spoilage of cutting oil or rolling oil containing mineral oil, characterized by adding 0.01 to 1.0% by weight of mineral oil. Emulsion-type cutting oil or rolling oil containing mineral oil is diluted with water at an appropriate ratio when used, stored in a tank, etc., and circulated between the tank and the equipment used.

Therefore, in the present invention, snso4 is added when diluting emulsion-type cutting oil or rolling oil containing mineral oil with water.

In the present invention, the cutting oil or rolling oil mainly includes mineral oil,
An emulsion type product consisting of a surfactant, rust preventive and water is used. In the present invention, SnSO.

The amount of addition is determined by considering the type of cutting oil or rolling oil containing the target mineral oil, the usage environment, etc., but it is 0.01 to 1.
．． If you add sleep amount%, the effect will be sufficient. Cutting oil or rolling oil containing mineral oil obtained by adding SnsO4 by the method of the present invention is placed in an oil tank and used for circulation in various equipment.

As mentioned above, metalworking oils obtained by adding organic fungicides using conventional methods have a short lifespan because the fungicides themselves are decomposed by microorganisms. It was necessary to add the fungicide.

On the other hand, in the cutting oil or rolling oil containing mineral oil obtained by the method of the present invention, the bactericide has a long life, so there is no need to add a bactericide as frequently as in the past.

Furthermore, SnsO4 used in the present invention has the advantage of exhibiting anti-septic effects against most microorganisms, regardless of the type of microorganisms, and is particularly effective against anaerobic bacteria and sulfate-ring bacteria. Show effectiveness. Therefore, the method of the present invention is extremely useful in metal processing fields such as the automobile industry and the mechanical industry.

Next, the present invention will be explained in detail with reference to examples.

Examples and Comparative Examples 20q of cutting oil or rolling oil containing fresh mineral oil (dilution ratio with water: 2x) was collected in a test tube,
To this, 0.1y1 oil content of chips (0.1yy sliding surface oil) and 0.1y rotten oil such as cutting oil or rolling oil containing the mineral oil are added.

Next, add the specified amount of the fungicide shown in Table 2 to this to make 3
Static culture was carried out at 0'C, and the number of viable bacteria (cells/Mt
) to measure. In addition, sliding surface oil is mixed into metal processing oil such as cutting oil during metal processing, and has the property of promoting the decomposition effect by microorganisms. In addition, chips are metal powder that is produced by cutting during metal processing, and is mixed into metal processing oil. When measuring the number of viable bacteria, the following culture medium is used for each type of bacteria.

1) Aerobic bacteria (agar plate method) Medium composition: Meat scratches 0.5%, peptone 1.0%, salt
Sodium chloride 0.5%, agar 1.5% (PH7.
O) ノ) Anaerobic bacteria (modified method ■L? Foundation medium) Medium composition: peptone 1.0%, yeast scratches 0.5%,
Heart extract 0.14%, glucose 0.2%, potassium dihydrogen phosphate 0.045%, potassium monohydrogen phosphate 0.045%, ammonium sulfate 0.09%, sodium chloride 0.09%, magnesium sulfate (anhydrous) salt) 0.009%, calcium chloride (anhydrous salt) 0
．． 09%, agar 1.5%, cysteine hydrochloride 0
．． 03%, sodium hydroxide 0.4% (PH7.O
) () Sulfate-reducing bacteria The oil agent A in the following example is used by adding 1.5% agar to Starkey Broth (American ●Type ●Power Luxury Collection 12th Edition, page 331 (197 edition)).
C has the following meaning.

Oil agent A: Emulsion type cutting oil Oil agent B: Soluble type cutting oil Oil agent C: Emulsion type rolling oil Viable number of aerobic bacteria, anaerobic cells, and sulfate-reducing bacteria in each oil agent before adding disinfectant (number/ml) Please refer to Table 1.

Table 2 shows the results of measuring the number of viable bacteria when each disinfectant was added.

As is clear from the results in Table 2, the cutting oil or rolling oil containing mineral oil obtained by adding tin according to the method of the present invention is
It exhibits excellent anti-corrosion effects, especially against anaerobic bacteria and sulfate-reducing bacteria.

Claims (1)

[Claims] 1. A method for preventing spoilage of cutting oil or rolling oil containing mineral oil, which comprises adding 0.01 to 1.0% by weight of SnSO_4 to emulsion-type cutting oil or rolling oil containing mineral oil.