JPS59213795A - Method for preventing spoilage of water-soluble metal processing fluids - Google Patents

Abstract

PURPOSE:To prevent the putrefaction of a water-soluble lubricant for the machining of a metal, with a small amount of an antiseptic and eight labor, by charging an antiseptic having a specific solubility in water in a container having a slit to enable the free passage of water, and dipping the container in a coolant. CONSTITUTION:An antiseptic having a solubility in water of <=0.1wt% (preferably 0.001-0.1wt%) (e.g. 1,2-benzoisothiazolin-3-one, p-chloro-m-xylenol, etc.) is charged in a container having a slit to enable the free passage of water (usually an opening of 10mum-10mm.), and the container is dipped in a coolant. The number of the slits of the above container is preferably selected to give the total area of the slits corresponding to >=0.1% of the surface area of the container.

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to a method for preventing spoilage of water-soluble metal finishing oil.

(Technical background) In metal processing such as cutting and rolling, water-soluble processing oil is often diluted with water and used as a shield ring. (The water-diluted solution of gold-finishing oil used in this manner is referred to as coolant in this book.) If coolant is not used properly, it will spoil due to abnormal growth of microorganisms. In order to use coolant for a long time and to use it stably, it is important to prevent its corrosion. In order to prevent coolant from spoiling, a preservative must be used to completely inhibit the growth of microorganisms.

One way to use preservatives is to add the preservative to the undiluted solution of metalworking fluid beforehand, or if this method is used, the preservative loses its effectiveness because it is inactivated by the fluid components.

Therefore, even if a preservative is added to the stock solution of the metalworking fluid in advance, it is essential to add the preservative to the coolant. Also, if the concentration of preservative in the coolant is too high, there is a risk of skin irritation in the worker.
It is desirable to keep the quality of preservatives to the minimum necessary.

However, since the preservative in the coolant disappears over time, it must be continually added to the coolant. For that purpose, a considerable amount of effort must be made.

(Object of the Invention) It is an object of the present invention to provide a method that reduces the management effort for preventing coolant from rotting and achieves a great anti-corrosive effect by consuming the preservative of the mound.

($+4 product of the invention) The present invention attempts to achieve the above object by selecting a preservative with a specific solubility, placing it in a container with a slit, and immersing it in a coolant. It is something. That is, the present invention requires that a preservative having a solubility in water of 0.1% or less in air volume be immersed in a coolant in a container having slits through which water can freely pass. This is a method to prevent rotting of water-soluble gold striped processing oil. In addition, in the present invention, the solubility in U water is 0. l 2i
The expression "f % or less" means that the amount of solute (preservative in this case) in 100 g of water is 0.17 or less.

Next, the requirements for building a tree will be explained in detail.

(Preservative) The preservative used in this invention is soluble in water.
Anything is acceptable as long as the degree of air flow is 0.1% or less. If the solubility is 0.1% higher than the air volume, the preservative in the container will dissolve into the coolant in a short period of time, and the concentration of the preservative in the coolant will become higher than necessary, creating a risk of skin irritation for workers. It happens. Furthermore, the rate of disappearance of the preservative is also unfavorable. On the other hand, if the solubility is lower than 0.001%, the preservative effect will be low even if it is dissolved in the coolant to the saturation concentration. It is particularly desirable to use a preservative with a high degree of strength. Moreover, the preservative can be used in any form of powder, granules, lumps, or paste.

Examples of suitable preservatives for use in this invention are shown in Table 1.

Note-1 Konoha TV\ni (1) Product name Diaphen (Toho Chemical Industry Co., Ltd.) Ingredients 5,4'-dibromosartylanilide and 3t
5 + Mixture of 4'-tribromozarzole anilide Br (2) Black market name Priventol A4 (manufactured by Bayer AG) Ingredients I-dimethyl-N'-phenyl-(N'-70)
Dichloromethylthio)-sulfamide can also be used.

(Container) The container used in this invention is required to have slits through which water can freely pass, but the size of the slits should be smaller than the size (particle size) of the preservative. It is necessary to adjust the amount depending on the condition and size of the preservative. Otherwise, the preservative would come out of the container without being dissolved, and the object of the invention would not be achieved. The desirable size of the pores is generally 10 μm or more and 10 μm or less. If the diameter is less than 10 μm, clogging is likely to occur particularly when a powdered preservative is used, and therefore it is difficult for the preservative to dissolve smoothly into the coolant. Another 10m? This is because if the preservative is in paste form, it will not dissolve and will leak out of the container, and even if it is in lump form, a small portion may come out of the container during use.

The number of #ill gaps in the container naturally depends on the size of the slits, but it is desirable that the total surface area of the slits is 0.1% or more with respect to the long surface of the container.

This is because if it is less than 0.1%, the preservative will not be smoothly eluted into the coolant.

Specifically, it is wrapped with preservatives in cloth made of fiber materials or nets made of metal or plastic materials, it is made into a bag and the preservative is placed inside it, or it is wrapped in boxes made of various materials. A lot of pores are opened and preservatives are added inside? There are ways to put it in.

(Effect of the invention) In the method of the present invention, C9 and preservatives are all eluted into the coolant, and the concentration of preservatives in the coolant (over the spiritual period)
Since it is maintained at a moderate level, the effort of frequently adding preservatives to the coolant can be saved, and the risk of developing skin irritation to workers is reduced. Furthermore, it is economical because the amount of preservative consumed can be reduced.

(Example) Next, the present invention will be explained in detail with reference to Examples.

However, the present invention is not limited in any way by these.

Using the method described below, a test coolant tank is provided, the coolant is circulated, and the method of the present invention is applied.
The effect? Tested.

(Test method) Volume 18. l! Whole wide-mouth can of / - Landkunk, sample coolant 2 to 10 to 51 and dry cut foundry chips (FO-25, 8 to 12 meshes) 10h firefly filling,
44 at a flow rate of 20 A/min using a circulation pump
I had 2 fris. Periodically, remove the septic liquid from the cutting oil emulsion (live bacteria: 2 x 10' cells).
0 f'! : The sample coolant was biochemically degraded by inoculation, and changes in the number of viable bacteria and odor were observed during feeding.For reference, rust prevention properties were investigated.

In addition, the trial sale is a cycle of 8 hours a day, circulation stopped for 16 hours, after returning green for 5 days, the shield ring stopped completely for 2 days, and then again 8 hours a day circulation, FM1 circulation stopped at 16:00. After repeating for 1 day, stop circulation for 1 day and try PA
'ff: Finished. During that time, from the 1st day to the 4th day,
On the 7th and 12th days, once a day for a total of 6 times, the cutting oil emulsion) B6 succumbed liquid (the number of viable bacteria was 2
108cells/tnl! ) 100V was added each time.

A cutting oil equivalent to JIS W-1-1 class (but does not contain preservatives) was used as the wire mesh processing oil.
: Gold sample coolant was diluted 20 times. The preservative shown in the first coating was used.

As a method of using the preservative, in the real oak example of the present invention, 15 sheets of medicated gauze are stacked, and the preservative is added in 607 g (
o for coolant, 6 wt/i) or 6F
(0.06 wt 5a to coolant) and immersed in coolant.

In a comparative example, 1 ov of preservative was added to cutting oil stock solution 5001, which was diluted 20 times and used as a coolant. (The concentration of preservative in the coolant is (+, l wt
9) As a reference example, a coolant to which no preservative was added was used. Table 2 shows the types and amounts of preservatives used in the actual IJ+i 9i1 and specific i table columns.

Coffin 2 Table (Evaluation items and test methods) (1) Dry-cut casting chips (F'O.25.
8-12 meshes)? Collect the coolant sample liquid in a veterinary dish (inner diameter 601Ta), and coolant sample liquid 25rrtlk from the tank force λ.
The mixture was collected and added to a colander, shaken thoroughly, and left to stand for about 10 minutes. Next, the sample solution was removed by the declination method, and the state of rust generated on the bedding dish was examined over time (display method) ◎ No rust occurred 01 - Rust occurred at several points Δ Rust occurred at several points - 173 surfaces X Rust has formed on surfaces 173 to 172xx Rust has formed on 1/2 or more surfaces (2+ pII hydrogen electrode pH meter) Measurement (3) Number of viable bacteria measured by plate counting method (plate culture method) (4) Coolant odor and Color Changes in the color of the coolant due to the generation of coolant odor and hydrogen sulfide 〇 (Display method) ○ No change observed compared to the initial state △ Offensive odor observed X Generation of hydrogen sulfide A gray-black ratio is observed.

(5) Remaining amount of preservative after completion of test After completion of the test, the gauze was opened, dried under reduced pressure at about 40°C, and weighed to determine its weight.

(Test results) The test results are shown on the third coat.

As is clear from the test results, when the method of the present invention is used, the preservative effect lasts for a long time with a single operation, so that the effort of frequently replenishing the coolant can be saved. Also, since the preservative gradually dissolves into the coolant, if the concentration of the preservative in the coolant increases rapidly, it can cause dermatitis to the worker. There is no danger arising. It is also economical because it can prevent spoilage of the coolant by consuming a small amount of preservative.

Remarks: The data on days 0 and 3.7 are all measurements of the condition of the 77th batch (1) before the addition of the emulsion spoilage method on each day.

Applicant Yunro Chemical Industry Co., Ltd. Agent Patent Attorney Isaka Award Husband

Claims (1)

[Claims] A preservative having a solubility in water of 0.1 M ft% or less is placed in a container having an aperture through which water can freely pass,
Water-soluble gold j) characterized by being immersed in a coolant
Method for preventing spoilage of processed oils.