JP6399888B2 - W / O microemulsion type cleaning agent management method and W / O microemulsion type cleaning agent management device - Google Patents

Description

  The present invention relates to a method for cleaning a W / O microemulsion-type cleaning agent, and in particular, low-polarity dirt and polarity attached to parts handled in various industrial fields such as automobiles, machines, precision equipment, electricity, electronics, and optics. The present invention relates to a method for managing a W / O microemulsion-type cleaning agent that can clean and remove dirt with a combination of high dirt.

  Parts (hereinafter referred to as “parts”) handled in various industrial fields such as automobiles, machinery, precision equipment, electricity, electronics, optics, etc. (i) water-insoluble, mainly composed of mineral oil, during processing Various processing oils from low polarity to high polarity, such as water-soluble processing oil obtained by adding a surfactant to processing oil, mineral oil and the like and emulsified in water, (ii) fine particles and the like are used. In particular, a lot of water-soluble processing oil is used mainly for cutting and grinding, and parts manufactured through multiple processing steps use different processing oils for each process, so polar In many cases, various stains from low to high polarity are combined and adhered.

  A cleaning agent composed of water, a solvent, and a surfactant has been developed for the purpose of cleaning parts having a mixture of various types of dirt from low polarity to high polarity. 1 and 2).

  In the W / O microemulsion type detergent described in Patent Document 2, water and a surfactant form reverse micelles having an average particle diameter of about 1 to 100 nm and are dispersed in a solvent (hereinafter referred to as “solubilization”). It is a transparent liquid as a whole, and is a thermodynamically stable system (hereinafter referred to as “microemulsion”) that does not separate into layers even when left for a long period of time.

  In the W / O microemulsion type cleaning agent described in Patent Document 2, it is considered that dirt with low polarity is dissolved in a solvent, and dirt with high polarity is dissolved in water forming reverse micelles. As dirt accumulates in the W / O microemulsion type detergent, the reverse micelles become larger in size and become cloudy (hereinafter referred to as “emulsification”), and finally the water that formed the reverse micelles settles. And separate the layers. The W / O microemulsion type cleaning agent in which water in the W / O microemulsion type cleaning agent is emulsified or separated cannot solubilize dirt brought in, and may cause poor cleaning. Therefore, in order to maintain the initial detergency of the W / O microemulsion type detergent, it is important to monitor the state of reverse micelles, that is, the solubilized water.

  Many of the cleaning agents used in the above-mentioned applications are added with water from the viewpoint of preventing ignition, and these cleaning agents have a high risk of ignition when moisture decreases with use. Cleaning performance decreases. Therefore, several methods for managing the amount of moisture as well as managing the dirt components brought in have been proposed (for example, Patent Documents 3 to 10).

  For example, Patent Documents 4 and 5 propose a method for measuring the amount of water in oil using a capacitance sensor. However, water in the cleaning agent, that is, water is solubilized in the cleaning agent. There is no method to judge the cleaning performance depending on whether or not it is managed and to manage the cleaning agent.

JP-A-6-346094 JP2013-117008A JP 2000-51577 A JP-A-8-136492 JP 2012-145438 A JP-A-7-280728 JP 7-248299 A Japanese Patent Laid-Open No. 5-45280 JP-A-7-151676 JP-A-7-147265

  The present invention has been made in view of the above, and a method and a management for managing a W / O microemulsion type detergent by simply and accurately confirming the cleaning performance of the W / O microemulsion type detergent. An object is to provide an apparatus.

  In order to solve the above-mentioned problems, the present inventors have conducted intensive research, and as a result, by measuring the conductivity of the W / O microemulsion type cleaning agent, a wide variety of dirt substances were brought into the cleaning agent. In some cases, the W / O microemulsion type cleaning agent is managed by judging whether water is solubilized in the W / O microemulsion type cleaning agent, that is, whether or not it has initial cleaning performance. As a result, the present invention has been completed.

That is, the present invention is a method for managing a W / O microemulsion-type cleaning agent, which measures the conductivity of the W / O microemulsion-type cleaning agent in use, and based on the obtained conductivity, (1)
R = [conductivity at 25 ° C. of used W / O microemulsion type cleaning agent] ÷ [conductivity at 25 ° C. of unused W / O microemulsion type cleaning agent] Formula (1)
Relative conductivity R is calculated by the above, and cleaning is performed when the calculated relative conductivity is 0.30 or more.

Further, the present invention is a management device for a W / O microemulsion-type cleaning agent, a conductivity measuring unit for measuring the conductivity of the W / O microemulsion-type cleaning agent in use, and the unused W / O memorizing the conductivity of the microemulsion type cleaning agent, using the conductivity measured by the conductivity measuring unit, and calculating a relative conductivity R based on the following formula (1);
R = [conductivity at 25 ° C. of used W / O microemulsion type cleaning agent] ÷ [conductivity at 25 ° C. of unused W / O microemulsion type cleaning agent] Formula (1)
When the determination unit determines whether the relative conductivity R calculated by the calculation unit is less than 0.30, and the determination unit determines that the relative conductivity is less than 0.30, the W / And an output unit for outputting that the O microemulsion type cleaning agent is replenished or replaced.

  The present invention provides a W / O microemulsion-type cleaning agent by measuring the conductivity of the W / O microemulsion-type cleaning agent, regardless of the dirt components brought into the W / O microemulsion-type cleaning agent. It is possible to determine whether or not water is solubilized and manage the cleaning performance of the W / O microemulsion type cleaning agent.

FIG. 1 is a graph showing the relationship between the concentration of a solution-type water-soluble cutting oil in a W / O microemulsion-type cleaning agent and conductivity. FIG. 2 is a block diagram of the management device for the W / O microemulsion-type cleaning agent according to the present embodiment.

  Conventionally, as a method of performance management of cleaning agents containing water, the amount of water in the cleaning agent is measured by capacitance, specific gravity, infrared absorbance, etc., and the amount of soil components is measured by turbidity, specific gravity, infrared absorption. However, no investigation has been made on how to determine the cleaning performance depending on the state of water in the cleaning agent, particularly the W / O microemulsion type cleaning agent, that is, whether or not the water is solubilized. .

  In determining the state of water in the W / O microemulsion-type cleaning agent, the present inventors paid attention to the relationship between the reverse micelle state and the electrical conductivity. As a result of diligent research, the relationship between the amount of dirt components brought into the W / O microemulsion type detergent and the electrical conductivity varies depending on the type of dirt components, but is solubilized in the W / O microemulsion type detergent. It has been found that the process of water emulsification and layer separation due to the introduction of various soil components and the deterioration of the cleaning performance can be easily traced by conductivity.

  Regarding the relationship between the amount of dirt components brought into the W / O microemulsion type detergent and the electrical conductivity, “NS Clean” (registered trademark) 100M (JX Nippon Mining & Co., Ltd.) is used as the W / O microemulsion type detergent. The case where UniSolble CS (manufactured by JX Nippon Oil & Energy Corporation), which is a solution-type water-soluble cutting oil, is used as a dirt component will be described with reference to FIG. FIG. 1 is a graph showing the relationship between the concentration of a solution-type water-soluble cutting oil in a W / O microemulsion-type cleaning agent and conductivity. The electrical conductivity in FIG. 1 is the electrical conductivity at 25 ° C. of the upper layer after adding a predetermined amount of a soil component to the W / O microemulsion type detergent, shaking the container by hand, and allowing to stand for 30 seconds. It was measured with a total HEC-110 type (manufactured by Toa Chemical Measurement Co., Ltd.). As shown in Fig. 1, as the concentration of the solution-type water-soluble cutting oil added to the W / O microemulsion-type detergent increases, the water transitions from a transparent state to an opaque emulsified state. At the same time, the electrical conductivity rises rapidly, and when the concentration of the solution-type water-soluble cutting oil increases, the electrical conductivity drops rapidly and the water is separated into layers. On the other hand, water-insoluble processing oils and emulsion-type water-soluble cutting oils, mainly composed of mineral oil, differ from solution-type water-soluble cutting oils, as the concentration of W / O microemulsion-type cleaning agents increases. Gradually decreases.

  Since the relationship between the amount of dirt components brought in and the electrical conductivity varies depending on the type of the soil components, it is difficult to evaluate the amount of the soil components mixed based on the conductivity. However, the cleaning performance of the W / O microemulsion-type cleaning agent is influenced by the state of water in the cleaning agent, that is, whether or not the water is solubilized, based on the amount of contaminated dirt components introduced. The present invention manages the cleaning performance of the W / O microemulsion-type cleaning agent by determining whether the water is solubilized rather than the amount of contamination or water, based on the conductivity. According to the present invention, it is possible to determine whether or not water is solubilized in the W / O microemulsion type cleaning agent and manage the W / O microemulsion type cleaning agent regardless of the type of the soil component. It becomes possible.

  Below, the management method of the W / O microemulsion type cleaning agent concerning embodiment of this invention is demonstrated in detail.

The management method of the W / O microemulsion-type cleaning agent according to the embodiment of the present invention measures the conductivity of the W / O microemulsion-type cleaning agent in use, and based on the obtained conductivity, the following formula ( 1)
R = [conductivity at 25 ° C. of used W / O microemulsion type cleaning agent] ÷ [conductivity at 25 ° C. of unused W / O microemulsion type cleaning agent] Formula (1)
Relative conductivity R is calculated by the above, and cleaning is performed when the relative conductivity R of the W / O microemulsion type cleaning agent is 0.30 or more.

  In the embodiment of the present invention, the W / O microemulsion-type cleaning agent is preferably a cleaning agent mainly composed of water, a solvent and a surfactant.

  As long as the W / O microemulsion type cleaning agent forms a W / O microemulsion, the amount of water in the cleaning agent is not limited, but the amount of water in the W / O microemulsion type cleaning agent is 1 mass. % Or more and less than 50% by mass. The water content in the W / O microemulsion-type cleaning agent can be controlled by the method of the present invention described below as long as it is 1% by mass to 50% by mass. The water content of the W / O microemulsion-type cleaning agent is preferably in the range of 1% by mass to 50% by mass even after various dirt components are brought in by use. The water content of the W / O microemulsion-type cleaning agent to which the management method of the present invention is applied is preferably 1% by mass to 20% by mass, more preferably 1% by mass to 15% by mass, and more preferably 1% by mass. % To 10% by mass is particularly preferably applied.

  The conductivity at 25 ° C. of the solvent used for the W / O microemulsion type cleaning agent is preferably less than 0.001 μS / cm, and more preferably less than 0.0001 μS / cm. When the electrical conductivity of the solvent at 25 ° C. is 0.001 μS / cm or more, the difference between the electrical conductivity of the W / O microemulsion type cleaning agent at 25 ° C. becomes small, and various stains are generated in the W / O microemulsion type cleaning liquid. It becomes difficult to determine the state of water when a substance is mixed. Here, the conductivity may be a value obtained by converting a value measured at an arbitrary temperature into a value of 25 ° C.

  As a solvent used for the W / O microemulsion type cleaning agent, for example, an organic solvent used as a base material for industrial cleaning agents such as aliphatic hydrocarbons, aromatic hydrocarbons, and terpenes is appropriately selected according to the purpose. For example, normal octane, normal nonane, normal decane, normal undecane, normal dodecane, isooctane, isononane, isodecane, isoundecane, isododecane, methylcyclohexane, indene, indane, decalin, tetralin, carbon number 8-18 Olefin, alkylcyclopentane, alkylcyclohexane, alkylbenzene, alkylindene having 10 to 18 carbon atoms, alkylindane, alkyldecalin having 11 to 18 carbon atoms, alkyltetralin, alkylnaphthalene, myrcene, serene Osimene, pinene, limonene, camphene, terpinolene, tricyclene, terpinene, fenchen, ferrandlene, sylvestrene, sapien, p-menten-1, p-menten-3, p-cymene, p-menthane, naphtha, kerosene, etc. Is mentioned. These may be used alone or in combination of two or more. Moreover, as long as a W / O microemulsion can be formed stably, you may mix | blend and use another solvent.

  The surfactant used in the W / O microemulsion type detergent is selected from anionic surfactants, cationic surfactants, amphoteric surfactants and nonionic surfactants depending on the purpose. For example, fatty acid monocarboxylate, N-acyloyl glutamate, alkylbenzene sulfonate, α-olefin sulfonate, naphthalene sulfonate-formaldehyde condensate, sulfosuccinic acid dialkyl ester, sulfuric acid Alkyl salt, alkyl polyoxyethylene sulfate, alkyl phosphate, alkylamine salt, alkyltrimethylammonium salt, dialkyldimethylammonium salt, alkyldimethylbenzylammonium salt, N, N-dimethyl-N-alkylaminoacetic acid betaine, 2- Alkyl-1-hydro Cyethyl-1-carboxymethylimidazolinium betaine, glycerin fatty acid ester, sorbitan fatty acid ester, sucrose fatty acid ester, polyoxyethylene alkylphenyl ether, polyoxyethylene alkyl ether, polyoxyethylene polyoxypropylene block copolymer, polyethylene glycol fatty acid ester And surfactants such as polyoxyethylene sorbitan fatty acid ester and fatty acid alkanolamide. These may be used alone or in combination of two or more. The amount of the surfactant in the W / O microemulsion type detergent is not limited as long as it forms a W / O microemulsion, but is preferably 20% by mass or less.

In the present embodiment, the management of the W / O microemulsion type cleaning agent includes the conductivity of an unused W / O microemulsion type cleaning agent at 25 ° C. and the W / O microemulsion type cleaning agent (A ) At 25 ° C. relative ratio (hereinafter referred to as “relative conductivity”) R. The calculation formula (1) for the relative conductivity R is shown below.
R = [conductivity at 25 ° C. of used W / O microemulsion type cleaning agent] ÷ [conductivity at 25 ° C. of unused W / O microemulsion type cleaning agent] Formula (1)

  When R is 0.30 or more, the water in the W / O microemulsion-type cleaning agent is in a solubilized state and is evaluated as being washable. If R is less than 0.30, the W / O microemulsion type cleaning agent may cause poor cleaning because water causes layer separation. When only solution-type water-soluble cutting oil is brought into the W / O microemulsion-type cleaning agent, the electric conductivity has a maximum value (see Fig. 1), but other water-insoluble cutting oil, emulsion-type water-soluble cutting oil When mixed together with a soluble water-soluble cutting oil, the conductivity behaves similar to that when an emulsion-type water-soluble cutting oil with intermediate properties between water-insoluble and solution-type water-soluble cutting oil is added. Therefore, the relative conductivity R of the W / O microemulsion type cleaning agent may be controlled to be 0.30 or more. In the case where only the solution-type water-soluble cutting oil is washed as a dirt component, the relative conductivity R may exceed 50. When the relative conductivity R exceeds 50, the cleaning agent is in an emulsified state and may cause poor cleaning. Therefore, when the solution-type water-soluble cutting oil is washed alone as a dirt component, the relative conductivity R in the W / O microemulsion-type cleaning agent is 0.30 to 50, preferably 0.30 to 30. Is preferably used.

  In the W / O microemulsion-type cleaning agent, the cleaning power begins to decrease when water cannot be maintained in a solubilized state, and it becomes difficult to remove dirt when the water is separated into layers. In the present invention, since it is possible to easily and accurately monitor whether water is solubilized in the W / O microemulsion type detergent, there is an indication that water cannot be maintained in a solubilized state. If this is the case, cleaning defects can be prevented by replacing or replenishing the W / O microemulsion type cleaning agent.

  As a commercial item of the above-mentioned W / O microemulsion type cleaning agent, for example, “NS Clean” (registered trademark) 100M, 220M (JX Nippon Mining & Energy Corporation) is exemplified.

  Further, the W / O microemulsion-type cleaning agent according to the present invention does not substantially contain water, but water derived from a soil component is mixed in the cleaning agent to form a W / O microemulsion, that is, cleaning. A detergent capable of solubilizing water in the agent is also included.

  Examples of the cleaning agent that substantially does not contain water but can solubilize moisture derived from the soil component in the cleaning agent include cleaning agents mainly composed of a solvent and a surfactant. As the solvent and the surfactant used in such a cleaning agent, the same solvents and surfactants used in the W / O microemulsion type cleaning agent can be used.

  Examples of commercially available cleaning agents that can solubilize moisture derived from soil components in the cleaning agent include “NS Clean” (registered trademark) 100 W and 220 W (JX Nippon Mining & Energy Corporation).

  In addition, the W / O microemulsion type cleaning agent according to the embodiment of the present invention may contain various additives as long as it is mainly composed of the above-described components. In the present specification, “being mainly” means that the ratio of the exemplified components in the W / O microemulsion type cleaning agent is 90.0% by mass or more.

  Examples of the additive include a rust inhibitor, an antioxidant, an antiseptic, a chelating agent, an alkali agent, a bleaching agent, and an odorant. Examples of the rust preventive include fatty acid ester rust preventives such as pentaerythritol monoester and sorbitan monooleate, amine rust preventives such as amines and amine salts, aromatic carboxylic acids, alkenyl succinic acids, and naphthenates. Examples include carboxylic acid rust preventives, organic sulfonic acid rust preventives such as petroleum sulfonate, organic phosphate ester rust preventives, and oxidized paraffin rust preventives.

  For measuring the conductivity of the W / O microemulsion-type cleaning agent, any commercially available conductivity meter or conductivity meter can be used as long as it has a temperature compensation function. Further, since the conductivity is the reciprocal of the volume resistivity, a volume resistivity meter can also be used. In this specification, although the handheld conductivity meter HEC-110 type (manufactured by Toa Chemical Measurement Co., Ltd.) is used, the present invention is not limited to this.

  In the management method of the W / O microemulsion type cleaning agent according to the present invention, relative conductivity may be calculated using various conductivity meters, and it may be determined whether it can be used manually, as shown in FIG. It can also be managed by a management device. FIG. 2 is a block diagram showing an outline of the W / O microemulsion-type cleaning agent management apparatus 10 according to the embodiment of the present invention. As shown in FIG. 2, the management device 10 stores the conductivity measuring unit 1 that measures the conductivity of the W / O microemulsion cleaning agent and the conductivity of the unused W / O microemulsion cleaning agent. Using the conductivity measured by the conductivity measuring unit 1, the calculating unit 2 calculates the relative conductivity R based on the above formula (1), and the relative conductivity R calculated by the calculating unit 2 is less than 0.30. When the determination unit 3 determines whether or not the relative conductivity is determined to be less than 0.30 by the determination unit 3, the W / O microemulsion-type cleaning agent is output to be replenished or replaced. The output part 4 and the control part 5 which controls each part are provided.

  In addition, by attaching the management device 10 on the line of the cleaning device, if the determination unit 3 determines that the relative conductivity is less than 0.30, the W / O micro is connected from the cleaning liquid supply line connected to the cleaning device. An emulsion type cleaning agent can also be automatically supplied to the cleaning device.

  Further, a moisture measuring device may be attached on the line of the cleaning device in addition to the management device 10 to simultaneously monitor the amount of water and the state of water in the W / O microemulsion type cleaning agent. When a large amount of water is brought into the W / O microemulsion type cleaning agent, the relative conductivity R may be less than 0.30. When the relative conductivity R is less than 0.30 due to a large amount of water brought into the W / O microemulsion type cleaning agent, the W / O microemulsion type cleaning agent is heated or irradiated with ultrasonic waves. By reducing the amount of water in the W / O microemulsion-type cleaning agent, it can be returned to a normal state (washable state). When the water content and the water state in the W / O microemulsion type cleaning agent are monitored by the management device 10 and the water measuring device, and the relative conductivity R is less than 0.30 and the water content exceeds 20% by mass, By heating or ultrasonically irradiating the W / O microemulsion type cleaning agent and reducing the water content to about 10% by mass, it is possible to return to a normal state where the relative conductivity R is 0.30 or more. If the relative electrical conductivity does not become 0.30 or more even when the water content is 10% by mass or less, it is judged that the cleaning power of the W / O microemulsion type cleaning agent is reduced, and the W / O micro is being used. It is desirable to replace the emulsion-type cleaning agent with a new liquid.

  Embodiments of the present invention are illustrated below by examples, but the present invention is not limited to these examples.

(Example)
“NS Clean” (registered trademark) which is a W / O microemulsion type cleaning agent in which a surfactant and water (3 mass%) are blended with an aliphatic hydrocarbon having a conductivity of 3 × 10 ⁻¹¹ μS / cm Samples (No. 2 to No. 22) in which various soil components shown in Table 1 were added to 100M (manufactured by JX Nippon Oil & Energy Corporation, sample No. 1) were prepared, and ultrasonic waves (28 kHz) were applied to 5 samples. The electrical conductivity at 25 ° C. of the supernatant liquid after irradiation for 1 minute and standing for a whole day and night was measured. The conductivity was measured with a handy conductivity meter HEC-110 (manufactured by Toa Chemical Measurement Co., Ltd.). Table 1 also shows the appearance of the liquid whose conductivity was measured and the result of the ink ink test. Here, the black ink test is a simple solubilization state of water in the W / O microemulsion detergent by examining the dispersibility of the ink (fine particles) added to the W / O microemulsion detergent. This is a test method that can be evaluated. In the ink test, a drop of ink is added to a sample of about 70 g, shaken by hand, and the dispersibility of the ink after standing for 1 minute is evaluated. If the ink was dispersed throughout the sample, it was marked as ◯, and if the ink was settled, it was marked as x. The overall evaluation is an evaluation based on the ink ink test and the appearance of the liquid. In the overall evaluation, ○ is washable and × is not washable.

  When Super Malpas DX150, which is a water-insoluble processing oil, is used as the soil component, the amount of soil component in the W / O microemulsion type cleaning agent is 40% by mass or more. 6-No. In 9, the relative conductivity was less than 0.30. No. 6-No. In No. 9, the ink ink test was evaluated as “good”, but the liquid was opaque or separated into layers, so the overall evaluation was “poor”.

  When Unisolble EM, which is an emulsion-type water-soluble processing oil, is used as a soil component, the amount of soil component in the W / O microemulsion-type cleaning agent is 80% by mass. 18, the relative conductivity was less than 0.30. No. The 18 ink ink test was o, but the liquid was opaque. No. In No. 18, since the viscosity became high due to the contamination of the soil component and the ink was not settled within 1 minute, the ink test was considered to be ○. No. The overall rating of 18 is x.

  When Unisolvable CS, which is a solution-type water-soluble processing oil, is used as the soil component, the amount of soil component in the W / O microemulsion type detergent is 10% by mass or more. In 20 to No. 22, the relative conductivity was less than 0.30. No. Ink tests of 20-22 were x, and the layers were separated. No. The comprehensive evaluation of 20-22 is x.

  From the above results, the relative conductivity R becomes 0.30 or more, and the overall evaluation becomes ◯, and the relative conductivity R does not affect the type and amount of dirt and the viscosity, and the W / O microemulsion type cleaning agent. It was shown that the state of the water inside can be managed easily. It was confirmed that the conductivity did not change even when the abrasive was mixed as dirt in the W / O microemulsion type cleaning agent. Thereby, even when the abrasive is mixed as dirt in the W / O microemulsion type cleaning agent, the W / O microemulsion type cleaning agent can be managed only by managing the relative conductivity R.

(Comparative Example 1)
The turbidity at 25 ° C. and the refractive index at 20 ° C. of the supernatant of the sample of Example 1 (No. 1 to No. 26) were measured. Turbidity was measured with a portable turbidimeter type 2100P (manufactured by Central Science Co., Ltd.). The refractive index was measured with an automatic refractometer RX-5000α (manufactured by Atago Co., Ltd.). Table 2 also shows the ink ink test, the appearance of the liquid, and the overall evaluation.

  The turbidity increases as the amount of dirt mixed in the W / O microemulsion type detergent increases. No. In 20-22, the turbidity does not increase even if the amount of contamination increases, and conversely decreases, but this is because the suspension has settled, and if measured immediately after ultrasonic irradiation, Turbidity increases.

  On the other hand, the refractive index increases or decreases with the amount of contamination, depending on the type of contamination brought into the W / O microemulsion type cleaning agent. It was confirmed that neither turbidity nor refractive index can determine whether or not the water in the W / O microemulsion type detergent is solubilized.

  As described above, the management method and management device for a W / O microemulsion type cleaning agent according to the present invention are suitable for management of a W / O microemulsion type cleaning agent whose cleaning performance varies depending on the introduction of a soil component.

Claims (5)

A method for managing a W / O microemulsion type cleaning agent,
The electrical conductivity of the W / O microemulsion type cleaning agent in use is measured, and based on the obtained electrical conductivity, the following formula (1)
R = [conductivity at 25 ° C. of used W / O microemulsion type cleaning agent] ÷ [conductivity at 25 ° C. of unused W / O microemulsion type cleaning agent] Formula (1)
A method for managing a W / O microemulsion-type cleaning agent, wherein the relative conductivity R is calculated by the step of cleaning, and cleaning is performed when the calculated relative conductivity R is 0.30 or more.   The W / O microemulsion-type cleaning agent management method according to claim 1, wherein the W / O microemulsion-type cleaning agent is a cleaning agent mainly composed of water, a solvent, and a surfactant. The method for managing a W / O microemulsion type cleaning agent according to claim 2 , wherein the electrical conductivity of the solvent at 25 ° C is less than 0.001 µS / cm.   The W / O according to any one of claims 1 to 3, wherein the soil component to be cleaned with the W / O microemulsion type cleaning agent is a water-insoluble and / or water-soluble processing oil. Management method of microemulsion type cleaning agent. A management device for a W / O microemulsion cleaning agent,
A conductivity measuring unit for measuring the conductivity of the W / O microemulsion type cleaning agent in use;
Storing the conductivity of the unused W / O microemulsion-type cleaning agent, using the conductivity measured by the conductivity measuring unit, and calculating a relative conductivity R based on the following formula (1); ,
R = [conductivity at 25 ° C. of used W / O microemulsion type cleaning agent] ÷ [conductivity at 25 ° C. of unused W / O microemulsion type cleaning agent] Formula (1)
A determination unit that determines whether or not the relative conductivity R calculated by the calculation unit is less than 0.30;
When the determination unit determines that the relative conductivity is less than 0.30, an output unit that outputs that the W / O microemulsion type cleaning agent is replenished or replaced;
A W / O microemulsion-type cleaning agent management device comprising:

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