JP2006063039A - Preservative for water-soluble metalworking oily agent - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an antiseptic technique for a water-soluble metalworking oily agent, having high antiseptic/germicidal effects and slight influence on the human body and useful for a long period of time. <P>SOLUTION: This preservative for the water-soluble metalworking oily agent comprises 1,2-benzoisothiazolin-3-one and at least one kind selected from the group of (1) 4,4-diaminodicyclohexylmethane, (2) 3-(diethylamino)propylamine and (3) 1-(2-aminoethyl)piperazine in the weight ratio of 1:2-1:70. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a preservative for suppressing and controlling deterioration contamination of a water-soluble metalworking fluid by microorganisms. The water-soluble metalworking fluid referred to in the present invention indicates a concept including a cutting agent, an abrasive and a plastic working agent that are used after being diluted with water.

  Water-soluble metalworking fluids are usually used after diluting with water, but the components used in the fluids contain many substances that are suitable nutrient sources for microorganisms such as bacteria, molds, and yeasts, so the processing fluid is There is a problem of corruption. When the rot occurs, the performance is lowered, and the workability is lowered due to a bad odor. Therefore, various bactericides and preservatives are used to prevent corruption. For example, it is known to add 1,2-benzisothiazolin-3-one (hereinafter referred to as BIT), formaldehyde donor compound, and phenolic compound. However, such preservatives and disinfectants are highly toxic, and there is a problem that adverse effects on the human body are observed when the amount necessary for preserving is used. Moreover, when the same bactericides and preservatives are used, there exists a problem that a resistant microbe produces | generates in a system and a preservative effect falls remarkably.

  BIT has good antiseptic performance, but has an effect on the human body such as skin disorders. Therefore, the present invention has a high antiseptic and sterilizing effect while reducing the amount of use, has little effect on the human body, and has a long period of time. It was made to provide a preservative technique for water-soluble metalworking fluids that could be used.

In order to solve the above problems, the present invention has studied the synergistic effect of various amines and BIT. As a result, by combining a specific amine and BIT in a specific ratio, the spoilage of the water-soluble processing oil can be remarkably suppressed. It has been found that the period for suppressing corruption is extended. That is, the present invention provides a water-soluble metalworking fluid containing component BIT and at least one selected from the group of the following components.
(1) 4,4-diaminodicyclohexylmethane (hereinafter referred to as DADCHM)
(2) 3- (Diethylamino) propylamine (hereinafter referred to as DEAPA)
(3) 1- (2-aminoethyl) piperazine (hereinafter referred to as AEP)

  As an effect of the invention, it is possible to reduce the influence on the human body while reducing the amount of BIT used, to enhance the antiseptic and sterilizing effect, and to maintain the effect for a long time.

  A feature of the present invention is that it contains at least one selected from BIT and components DADCHM, DEAPA, and AEP. The ratio of a preferred BIT to at least one selected from the components DADCHM, DEAPA and AEP is 1: 2 to 1:70 by weight, and a particularly preferred ratio is 1: 4 to 1:50. The components DADCHM, DEAPA and AEP may be used alone or in combination.

  Although the preservative of this invention is mix | blended with a water-soluble metalworking fluid, you may add it to the processing liquid which diluted the water-soluble metalworking fluid with water depending on the case.

  As for the usage-amount of the preservative of this invention, generally 0.1 to 10 weight% is mix | blended in a water-soluble metal processing liquid. The concentration in the working fluid diluted with water is preferably 0.01 to 1% by weight. If the amount is 0.01% by weight or less, the anti-corrosion effect does not appear. If the amount is 1% by weight or more, the anti-corrosion effect is not improved, which is not economical.

  The water-soluble processing oil according to the present invention includes, in addition to the substances provided by the present invention, conventional additives depending on the type of the processing oil, such as rust preventives (for example, fatty acids, borates, alkanolamines, etc.), lubrication Agents (fatty acids, mineral oils, oils and fats, synthetic lubricating oils, etc.), extreme pressure additives, surfactants, metal anticorrosives, antifoaming agents, dyes, fragrances and the like are blended in time.

Preservative efficacy test in synthetic medium 100 ml of Steiner's medium (Table 1) was placed in a 500 ml Sakaguchi shake flask, and glucose (1 g / L) was added as a carbon source. To this medium, the amine compound DADCHM (1,000 ppm) and BIT (100 ppm) were added to adjust the pH to 8.5. 1 ml of a spoiled emulsion type cutting fluid was added to each test solution, and cultured at 30 ° C. at a shaking frequency of 100 times / minute. The growth of the fungus was performed using a spectrophotometer. D. = Measured by absorbance at 660 nm. The result is shown in FIG.

Preservative efficacy test for water-soluble processing oil agent A test solution was prepared by adding DEAPA or AEP and BIT to a concentration obtained by diluting an emulsion type processing oil agent 30 times with tap water to a concentration shown in Table 2. 80 ml of the prepared test solution was put into a 100 ml Erlenmeyer flask, and after adding 0.8 ml of a rotted processing oil solution, the test was performed at 30 ° C. with a rotation frequency of 150 rpm in a rotary shaking incubator. After measuring the pH daily, 0.8 ml of septic solution was added. The results are shown in FIGS. This water-soluble processing oil was judged to have decayed due to the generation of odor when the pH dropped to 8 or lower.

Antiseptic effect synergistic effect test on water-soluble processing oil Emulsion-type processing oil diluted 30 times with tap water was used. A test solution was prepared by adding DEAPA or AEP and BIT to the solution so as to have a concentration shown in Table 3. After adding 80 ml of the prepared test solution to a 100 ml Erlenmeyer flask and adding 0.8 ml of a rotted processing oil solution, the test was carried out for 7 days at 30 ° C. with a shaking shaker at 150 rpm. During the test period, 0.8 ml of rot solution was added every day, and the pH on the seventh day was measured. The results are shown in Tables 4 and 5. Since this water-soluble processing oil agent generates odor (decays) when the pH is lowered to 8 or less, the concentration of the drug at the time when the pH is lowered to 8 on the seventh day is defined as the minimum inhibitory concentration (MIC). . The MIC on the 7th day from Table 4 was 300 ppm for BIT and 1000 ppm for DEAPA. FIG. 4 shows a portion where the decay of the water-soluble cutting fluid at a concentration below the diagonal line of the MIC is suppressed by hatching. The numerical value in the figure indicates the weight ratio of BIT and DEAPA at the point ●.

  FIG. 5 is similar to FIG. The numerical values in the figure indicate the weight ratio of BIT and AEP at the point ●.

  This test method is a method called a binary dilution method, and is a method for quantitatively measuring the optimum blending between drugs and the synergistic effect. As shown in FIG. 4 and FIG. 5, the existence of the shaded area indicates that a synergistic effect is observed. (Reference: Maki Koryo, Kazutaka Takeichi, etc., Tsuji Journal, 50, 86-92 (1972))

The figure which shows the effect of invention of Example 1 The figure which shows the effect of invention of Example 2 The figure which shows the effect of invention of Example 2 It is a MIC graph figure which shows the synergistic effect of the active ingredient of invention. It is a MIC graph figure which shows the synergistic effect of the active ingredient of invention.

Claims (2)

An antiseptic for a water-soluble metalworking fluid containing 1,2-benzisothiazolin-3-one and at least one selected from the group of components shown below.
(1) 4,4-Diaminodicyclohexylmethane
(2) 3- (Diethylamino) propylamine
(3) 1- (2-Aminoethyl) piperazine A preservative for a water-soluble metalworking fluid containing 1,2-benzisothiazolin-3-one and at least one selected from the group of the following components in a weight ratio of 1: 2 to 1:70.
(1) 4,4-Diaminodicyclohexylmethane
(2) 3- (Diethylamino) propylamine
(3) 1- (2-Aminoethyl) piperazine

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