JPS5851039B2 - How to prevent metalworking oil from rotting - Google Patents

Description

[Detailed description of the invention] The present invention relates to a method for preventing corrosion of metal working oil.

BACKGROUND ART Conventionally, as a method of preventing metalworking oil from spoiling, a disinfectant, particularly an organic disinfectant, has been added to the metalworking oil.

However, even if the anti-corrosion effect of this organic disinfectant is good against specific microorganisms, sufficient effects 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 degraded by microorganisms, and their anti-septic effects necessarily last only for a short period of time, so disinfectants must be added frequently. There is a need to.

Additionally, a method has been proposed to prevent rot by adding metal salts to metalworking oil, but there is a risk that the metal salts will dissolve in water and leak outside, polluting the environment.

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

The present invention is a method for preventing corrosion of metal working oil, which is characterized by bringing the metal working oil into contact with metallic cobalt.

As illustrated in FIG. 1, the metalworking oil is stored in a storage tank 1, and a predetermined amount of the oil is sent to a metal cobalt sterilizer 4 via piping 2 and a pump 3, where it is brought into contact with metal cobalt and sterilized. , sent to a workshop and used for cutting metal materials, etc.

Thereafter, it is returned to the storage tank 1 through the pipe 5 after undergoing treatments such as filtration.

In the present invention, there is no particular restriction on the method of bringing metal working oil into contact with metal cobalt, but as shown in FIG. 2, it is preferable to use a cylindrical sterilizer (sterilizer cylinder) made of glass or the like.

Figure 2a shows a sterilization cylinder filled with cobalt particles or cobalt plating particles with cobalt supported on the surface, Figure 2A shows a sterilization cylinder filled with perforated cobalt plated plates, and Figure 2C 2A and 2B are perspective views showing sterilization cylinders each having a cobalt-plated mesh therein.

When using such a sterilizing cylinder, its size etc. may be appropriately selected in consideration of the amount of metal working oil to be used.

In the present invention, by passing the metal working oil through a sterilizing device such as a sterilizing cylinder, the metal working oil is brought into contact with metal cobalt, and the metal working oil is prevented from decomposing.

Examples of metalworking oils include cutting oils, rolling oils, heat treatment oils, and the like.

There are two types of cutting oil: emulsion type, which mainly consists of mineral oil, surfactant, rust inhibitor, and water, and soluple type, which mainly consists of large amount of surfactant, small amount of mineral oil, rust inhibitor, and water. There is an emulsion type.

Furthermore, examples of the heat-treated oil include those made of polyethylene glycol and water.

According to the method of the present invention, unlike the conventional method of sterilizing metal working oil by adding a metal salt, there is no risk of the oil dissolving in water and flowing out and polluting the environment.

Furthermore, the method of the present invention has the advantage that it exhibits a spoilage-preventing effect against most microorganisms, regardless of the type of microorganism, and that the spoilage-preventing effect lasts for a long period of time.

Therefore, the method of the present invention is extremely useful in metal processing fields such as the automobile industry and the machinery industry.

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

Example 1 and Comparative Example 1.2 Emulsion-type metalworking oil (dilution ratio: 30 times) 10- was collected in a test tube, and this was mixed with 0.5vol% of sliding surface oil and 0.5% of casting chips (W/ V), decayed sample 0.5% (V/
V) was added.

Next, *: one to which cobalt powder was added (Example 1), one to which a commercially available organic fungicide was added (Comparative Example 1), and one to which no fungicide was added (Comparative Example 2) were tested for 30 days for 10 days. The cells were statically cultured at ℃, and the number of bacteria was measured.

The measurement results are shown in Table 1.

Note that 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.

Further, casting chips are foundry powder produced by cutting during metal processing, and are mixed into metal processing oil.

The number of aerobic bacteria was measured by the agar plate method, and the number of anaerobic bacteria and sulfate ring-forming bacteria was measured by the roll tube method.

Example 2 and Comparative Example 3 Glass 2. Collect 1.51 of metal working oil (dilution ratio: 30 times) in an oil container, and add 0.5% (V/V) of sliding surface oil to this.
) was added.

The metal working oil in the container is extracted by a pump through a glass tube, and 20 metal cobalt particles (diameter 4 to 10 mπ) are extracted.
1 and then poured into a funnel containing 75 grams of foundry chips.

The flow rate of the oil was such that the entire amount of oil was circulated once every 10 minutes.

The presence or absence of bad odor and the number of bacteria were measured every predetermined number of days.

The measurement results are shown in Table 2. For comparison, Table 2 also shows the results when the metal cobalt particles were circulated without passing through a glass container (Comparative Example 3).

The number of viable bacteria added was the same as in Table 1.

[Brief explanation of drawings]

Fig. 1 is a flow sheet of one embodiment of the method of the present invention, and Fig. 2 a, b, and c are each of the sterilization tubes when a cylindrical sterilization device (sterilization tube) is used in the method of the present invention. It is a perspective view showing an aspect. 1... Storage tank, 2, 5... Piping,
4...Metal cobalt sterilizer. 3...Po

Claims (1)

[Claims] 1. A method for preventing corrosion of metal working oil, which comprises bringing metal working oil into contact with metal cobalt.