JP2015141125A - Method and device for measuring water of cleaning agent - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method and device for measuring water of a cleaning agent, capable of easily and accurately measuring a water content in the cleaning agent.SOLUTION: A method for measuring water in a cleaning agent (A) including water at a ratio of 1 mass% or more and less than 50 mass% or a cleaning agent (B) capable of mixing water derived from a contaminant therein without substantially including water comprises: the step of measuring the refractive index of the cleaning agent (A) or (B) by a refractive index measurement part 1; the step of measuring the density of the cleaning agent (A) or (B) by a density measurement part 2; and the calculation step of calculating a water content by a water calculation part 4 using a calibration curve previously formed on the basis of correlations among the water content, refractive index and density of the cleaning agent (A) or (B).

Description

  TECHNICAL FIELD The present invention relates to a cleaning agent moisture measuring method and a cleaning agent moisture measuring device, and in particular, has low 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 cleaning agent moisture measuring method and a cleaning agent moisture measuring device capable of cleaning and removing a stain in which a stain and a highly polar stain are combined.

  Parts (hereinafter referred to as “parts”) handled in various industrial fields such as automobiles, machines, precision equipment, electricity, electronics, optics, etc. (i) oil-based processing mainly composed of mineral oil Various processing oils from low polarity to high polarity, such as a water-soluble processing oil emulsified in water by adding a surfactant to oil, mineral oil or the like, (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. Further, when performing machining such as cutting, grinding, and polishing, a wax is used as a temporary fixing adhesive for fixing the component to a jig. When the machining of the part is finished, the wax adhering to the part is removed. Various waxes are used depending on the application, from those having a low polarity to those having a high polarity.

  When cleaning parts with a mixture of various types of dirt from low polarity to high polarity, water and solvent or cleaning agent consisting of water, solvent and surfactant is used. (For example, Patent Documents 1 and 2).

  In the cleaning agents as described in Patent Documents 1 and 2, in order to maintain a high cleaning power against dirt composed of a plurality of components, it is necessary to appropriately manage the amount of water in the cleaning agent. is important. Several methods have been proposed for managing moisture in cleaning agents.

  The most common moisture measurement method defined by JIS and others is the Karl Fischer method (hereinafter referred to as KF method), but is not suitable for on-site measurement. This is because the KF method is a titration analysis, and skill is required for work.

  A method of managing the moisture of the cleaning agent based on the humidity of the air in the cleaning device in equilibrium with the cleaning agent and the electrical conductivity of the cleaning agent (Patent Document 3), and the amount of moisture in the oil using a capacitance sensor Although a method of measuring has been proposed (Patent Documents 4 and 5), it is difficult to apply to a method of determining the amount of water in a cleaning agent in which various types of dirt are introduced. This is because it is difficult to cover all the influences of various kinds of dirt from a low polarity to a high polarity that can be brought into the cleaning agent.

  Also, a method of controlling the water concentration of the cleaning agent within a certain range by using both infrared absorbance and turbidity (Patent Documents 6 and 7), and managing the water concentration of the cleaning agent by measuring near infrared absorbance. (Patent Documents 8 and 9), however, since it cannot be applied to a material in which an absorption band overlaps with water in the infrared region, a wide variety of contaminants from low polarity to high polarity are available. Application to cleaning agents that can be brought in is difficult.

  Furthermore, a method for maintaining the moisture concentration of the cleaning agent at an appropriate level by measuring the specific gravity of the cleaning agent (Patent Document 10), and a method for maintaining the moisture concentration of the cleaning agent at an appropriate level by measuring the specific resistance of the cleaning agent. Although a method to do this has also been proposed (Patent Document 11), any method does not take into account measurement errors due to dirt substances brought into 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 JP-A-2-53899

  This invention is made | formed in view of the above, Comprising: It is providing the moisture measuring method of the cleaning agent which can measure the moisture content in a cleaning agent easily and correctly, and the moisture measuring apparatus of a cleaning agent.

  In order to solve the above-mentioned problems, the present inventors have conducted intensive research.As a result, the refractive index and the density of the physical properties of the cleaning agent are measured. In combination with the present invention, it has been found that the moisture content of the cleaning agent can be accurately calculated even when a wide variety of dirt substances from low polarity to high polarity are brought into the cleaning agent. It came to complete.

  That is, the method for measuring the moisture content of the cleaning agent of the present invention is a cleaning agent (A) containing water in a proportion of 1% by mass or more and less than 50% by mass, or is substantially free of water but cleans the moisture derived from soil components. A method for measuring moisture in a cleaning agent (B) that is miscible in the cleaning agent, the step of measuring the refractive index of the cleaning agent (A) or (B), and the cleaning agent (A) or (B) A step of measuring the density, and a calculation step of calculating the water content by a calibration curve based on the correlation between the water content of the cleaning agent (A) or (B) prepared in advance and the refractive index and density. Features.

  In addition, the cleaning agent moisture measuring apparatus of the present invention includes the cleaning agent (A) containing water in a proportion of less than 50% by mass, or water substantially not containing water but mixing moisture derived from the soil components into the cleaning agent. A device for measuring moisture in a possible cleaning agent (B), a refractive index measuring unit for measuring the refractive index of the cleaning agent (A) or (B), and the density of the cleaning agent (A) or (B) A density measuring unit that measures the amount of water, a storage unit that stores a calibration curve based on the correlation between the water content of the cleaning agent (A) or (B) prepared in advance, the refractive index, and the density, the refractive index measuring unit, A moisture calculation unit that uses the refractive index and density of the cleaning agent (A) or (B) measured by the density measurement unit and calculates a moisture content based on a calibration curve stored in the storage unit. It is characterized by that.

  Since the present invention creates a calibration curve based on the correlation between the density, refractive index and water content of the cleaning material in consideration of the dirt components brought into the cleaning material, the density of the cleaning material whose water content is to be measured. By simply measuring the refractive index, an accurate moisture amount can be easily measured regardless of the presence or absence of a soil component in the cleaning agent.

FIG. 1 is a block diagram showing an outline of a cleaning agent moisture measuring apparatus according to an embodiment of the present invention. FIG. 2 is a graph showing the relationship between the amount of water calculated by the method for measuring the water content of the cleaning agent according to the embodiment of the present invention and the amount of water obtained by the KF method. FIG. 3 is a graph showing the relationship between the amount of water calculated based on a calibration curve created from only the refractive index and the amount of water obtained by the KF method. FIG. 4 is a graph showing the relationship between the amount of water calculated based on a calibration curve created from only the density and the amount of water obtained by the KF method.

  Conventionally, the amount of moisture in the cleaning agent has been measured by the capacitance, specific gravity, infrared absorption, etc. of the cleaning agent, but there is no consideration for the error in the amount of moisture caused by the introduction of dirt components into the cleaning agent. Even if it was not taken into account, accurate figures could not be calculated.

  In measuring the amount of water in the cleaning agent, the present inventors are the physical properties of water and solvent, which are the main components in the cleaning agent, and the soil component brought into the cleaning agent. Attention was paid to those in which the physical property values of the solvents do not overlap and the physical property values of the water and the soil component in the cleaning agent behave differently depending on increase / decrease, that is, refractive index and density. The present inventors made a calibration curve based on the correlation between the refractive index and density of the cleaning agent in the absence and / or presence of the soil component and the moisture content, and determined the density and refractive index of the cleaning agent. The present inventors have found that an accurate amount of moisture in a cleaning agent can be easily measured regardless of whether or not a dirt component is brought into the cleaning agent simply by measuring.

  The density of the cleaning agent increases as the amount of water in the cleaning agent increases, and also increases as the amount of soil components increases. On the other hand, the refractive index of the cleaning agent decreases as the amount of water in the cleaning agent increases, and increases as the amount of dirt components increases. Therefore, in the method for measuring moisture content of the cleaning agent according to the present invention, the density and refractive index of the cleaning agent and the corresponding moisture content are different because the density and refractive index of the cleaning agent behave differently depending on the increase and decrease of the moisture content and dirt components. When a calibration curve is created from the above, it is possible to calculate the water content with high accuracy.

  Hereinafter, a cleaning agent moisture measuring method and a cleaning agent moisture measuring apparatus according to an embodiment of the present invention will be described in detail.

  The method for measuring water content of a cleaning agent according to an embodiment of the present invention includes a cleaning agent (A) containing water at a ratio of 1% by mass or more and less than 50% by mass, or substantially free of water, but derived from a soil component. A method for measuring moisture in a cleaning agent (B) in which moisture is miscible in the cleaning agent, the step of measuring the refractive index of the cleaning agent (A) or (B), and the cleaning agent (A) or ( The step of measuring the density of B), and the amount of water content, refractive index and density in the absence and / or presence of a soil component brought into the cleaning agent (A) or (B) prepared in advance. And a calculation step of calculating a moisture content using a calibration curve based on the correlation.

  In the embodiment of the present invention, the density of the solvent used for the cleaning agent (A) or (B) is lower than that of water and the stain component to be cleaned, and the refractive index of the solvent used for the cleaning agent is higher than that of water. It is preferable that it is smaller than the soil component to be treated. When the solvent used for the cleaning agent (A) or (B) is a mixture, the density of the mixed solvent is lower than that of water and the soil component to be washed, the refractive index of the mixed solvent is greater than that of water, and the stain component to be washed Small is enough.

  The refractive index at 20 ° C. of the solvent used for the cleaning agent (A) or (B) is preferably 1.35 to 1.46, more preferably 1.37 to 1.44. If the refractive index of the solvent at 20 ° C. is less than 1.35, the difference in refractive index between the solvent and water becomes small, so that the measurement error becomes large when various contaminants are mixed in the cleaning liquid. On the other hand, if the refractive index of the solvent at 20 ° C. exceeds 1.46, the difference in refractive index between the solvent and the dirt substance becomes small, so that the measurement error when various dirt substances are mixed in the cleaning liquid becomes large.

  The density at 15 ° C. of the solvent used for the cleaning agent (A) or (B) is preferably 0.70 to 0.95 g / mL, and more preferably 0.72 to 0.93 g / mL. If the density at 15 ° C. of the solvent is less than 0.70 g / mL, the flash point of the solvent may be lowered, which may be dangerous. If the density exceeds 0.95 g / mL, there is a difference in density between the solvent and the dirt substance. Therefore, the measurement error increases when various kinds of dirt substances are mixed in the cleaning liquid.

  As long as the moisture content of the cleaning agent (A) is 1.0 mass% to 50.0 mass%, the moisture content can be measured by the moisture measurement method of the present invention. The water content of the cleaning agent (A) is preferably in the range of 1.0% by mass to 50.0% by mass even after various dirt components are brought in by use. The water content of the cleaning agent (A) is preferably 5.0% by mass to 20.0% by mass, more preferably 5.0% by mass to 15.0% by mass, and 5.0% by mass. % To 10.0% by mass is particularly preferably applied.

  The cleaning agent (A) containing water in a proportion of 1% by mass or more and less than 50% by mass is composed of water and a cleaning agent (A1) mainly composed of a polar solvent that is soluble in water, or water, a nonpolar solvent, and a surfactant. The main cleaning agent (A2) is preferred.

  Examples of polar solvents that can be dissolved in water used in the cleaning agent (A1) include organic solvents used as substrates for industrial cleaning agents such as alcohols, esters, glycol ethers, ketones, and amides, depending on the purpose. For example, ethyl alcohol, propyl alcohol, isopropyl alcohol, butyl alcohol, isobutyl alcohol, hexyl alcohol, octyl alcohol, cyclohexanol acetate-n-butyl, isoamyl acetate, 2-ethylhexyl acetate, acetoacetate Methyl, ethyl acetoacetate, methyl lactate, ethyl lactate, butyl lactate, γ-butyl lactone, dimethyl succinate, dimethyl glutarate, dimethyl adipate, 3-methyl-3-methoxybutyl acetate, diethylene glycol monobutyl ester Teracetate, dipropylene glycol monobutyl ether acetate, ethylene glycol mono-n-hexyl ether, diethylene glycol monomethyl ether, diethylene glycol monoethyl ether, diethylene glycol mono-n-propyl ether, diethylene glycol mono-i-propyl ether, diethylene glycol mono-n-butyl ether , Diethylene glycol mono-i-butyl ether, propylene glycol monomethyl ether, propylene glycol mono-n-propyl ether, propylene glycol mono-i-propyl ether, propylene glycol mono-n-butyl ether, propylene glycol mono-i-butyl ether, dipropylene glycol Monomethyl ether, dipropylene Recall mono-n-propyl ether, dipropylene glycol mono-i-propyl ether, dipropylene glycol mono-n-butyl ether, dipropylene glycol mono-i-butyl ether, tripropylene glycol monomethyl ether, 3-methoxybutanol, 3-methyl -3-methoxybutanol, diethylene glycol dimethyl ether, diethylene glycol diethyl ether, diethylene glycol di-n-butyl ether, dipropylene glycol dimethyl ether, acetone, methyl ethyl ketone, N-methyl-2-pyrrolidone, N, N-dimethylformamide, N, N-dimethylacetamide Etc. These may be used alone or in combination of two or more. Moreover, the polar solvent which can be dissolved with water may be a mixture with a non-polar solvent which does not dissolve with water as long as it dissolves with water at an arbitrary ratio.

  As a commercial item of the cleaning agent (A1) mainly composed of water and a polar solvent soluble with water, for example, “Fine Top” (registered trademark) J210 (Kuraray Co., Ltd.) is exemplified.

  In the cleaning agent (A1) mainly composed of water and water and a polar solvent that is soluble, there is a danger of ignition when the water content is below a predetermined value, and when the water content is above a predetermined value. Detergency is reduced. By simply and accurately measuring the amount of water in the cleaning agent (A1) according to the present invention, when the amount of water becomes a predetermined value or less, water is added to the cleaning agent (A1) to cause ignition. In addition to avoiding danger, defective cleaning can be prevented by replacing the cleaning agent (A1) when the amount of water exceeds a predetermined value.

  The cleaning agent (A2) mainly containing water, a nonpolar solvent and a surfactant is preferably one that forms a W / O emulsion or a W / O microemulsion. As long as the cleaning agent (A2) forms a W / O emulsion or a W / O microemulsion, the amount of water is not limited, but may be contained in a proportion of 1% by mass or more and less than 50% by mass. preferable.

  The nonpolar solvent used in the cleaning agent (A2) is appropriately selected from organic solvents used as a base material for industrial cleaning agents such as aliphatic hydrocarbons, aromatic hydrocarbons, and terpenes, depending on the purpose. For example, normal octane, normal nonane, normal decane, normal undecane, normal dodecane, isooctane, isononane, isodecane, isoundecane, isododecane, methylcyclohexane, indene, indane, decalin, tetralin, 8-18 carbon atoms Olefin, alkylcyclopentane, alkylcyclohexane, alkylbenzene, alkylindene having 10 to 18 carbon atoms, alkylindane, alkyldecalin having 11 to 18 carbon atoms, alkyltetralin, alkylnaphthalene, myrcene, selenium, osymene, Nene, limonene, camphene, terpinolene, tricyclene, terpinene, fenchen, ferrandlene, sylvestrene, sapiane, p-menthen-1, p-menten-3, p-cymene, p-menthane, naphtha, kerosene, etc. . These may be used alone or in combination of two or more. Moreover, if a W / O emulsion or a W / O microemulsion can be formed stably, you may mix | blend and use a polar solvent in a nonpolar solvent.

  The surfactant used in the cleaning agent (A2) is appropriately selected from anionic surfactants, cationic surfactants, amphoteric surfactants, and nonionic surfactants according to the purpose. For example, fatty acid monocarboxylates, N-acyloyl glutamates, alkyl benzene sulfonates, α-olefin sulfonates, naphthalene sulfonate-formaldehyde condensates, sulfosuccinic acid dialkyl esters, alkyl sulfate salts, Alkyl polyoxyethylene sulfate salt, alkyl phosphate salt, alkylamine salt, alkyltrimethylammonium salt, dialkyldimethylammonium salt, alkyldimethylbenzylammonium salt, N, N-dimethyl-N-alkylaminoacetic acid betaine, 2-alkyl-1 -Hydroxyethyl-1-cal Xymethylimidazolinium 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, polyoxyethylene Surfactants such as sorbitan fatty acid esters and fatty acid alkanolamides may be mentioned. These may be used alone or in combination of two or more. The amount of the surfactant in the cleaning agent (A2) is not limited as long as it forms a W / O emulsion or a W / O microemulsion, but is preferably 20% by mass or less. .

  As a commercial product of the cleaning agent (A2) mainly containing water, a nonpolar solvent and a surfactant, for example, “NS Clean” (registered trademark) 100M, 220M (JX Nippon Oil & Gasoline Co., Ltd.), a W / O microemulsion type cleaning agent. Energy Co.) is exemplified.

  In the cleaning agent (A2) mainly containing water, a nonpolar solvent and a surfactant, when the water content is out of the predetermined range, the cleaning power is reduced. By simply and accurately measuring the amount of water in the cleaning agent (A2) according to the present invention, when the amount of water becomes a predetermined value or less, water is added to the cleaning agent (A1) and the cleaning power is increased. In addition, when the amount of water becomes a predetermined value or more, cleaning failure can be prevented by exchanging the cleaning agent (A2), leaving the cleaning agent (A2), or removing water by heating.

  The present invention is also applicable to the measurement of the water content of the cleaning agent (B) that contains substantially no water but is capable of mixing moisture derived from the soil component into the cleaning agent. Here, “mixing moisture derived from the soil component in the cleaning agent” means a state in which water is dissolved in the cleaning agent or water is stably dispersed in the cleaning agent.

  Examples of the cleaning agent (B) that is substantially free of water but miscible with water derived from the soil component can be incorporated into the cleaning agent, for example, a cleaning agent (B1) mainly composed of a polar solvent and a nonpolar solvent, and a nonpolar solvent And a detergent (B2) mainly comprising a surfactant. The polar solvent, nonpolar solvent, and surfactant used in the cleaning agent (B) can be the same as the polar solvent, nonpolar solvent, and surfactant used in the cleaning agent (A).

  As a commercial item of a cleaning agent (B), "NS clean" (trademark) 100R, 100W, 220W (JX Nippon Mining & Energy Corporation) is illustrated, for example.

  In addition, the cleaning agent (A) or (B) 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, “mainly” means that the proportion of the exemplified components in the 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 the measurement of the refractive index of the cleaning agent (A) or (B), any commercially available refractometer can be used as long as it has a temperature compensation function.
The density of the cleaning agent (A) or (B) may be measured using a density meter utilizing any principle such as a differential pressure type, a float type, a vibration type, a radiation type, etc., but is measured online in a cleaning device. In this case, a differential pressure type or a vibration type density meter is preferable. As with the refractometer, the density meter used in the present invention preferably has a temperature compensation function.

The calibration curve can be created using a conventional method. That is, the refractive index and density of the cleaning agent are measured, and the following equation (1) (regression equation) that represents the correlation with the amount of water contained in the cleaning agent or the amount of water by the KF method may be prepared. .
W = A × R + B × D + C (1)
(In Formula (1), W is a water content (mass%), R is a refractive index, D is a density (g / mL), A, B, and C are constants), A, B, and C are determined. Using the calibration curve (regression equation) of Equation (1), the amount of water can be accurately and easily determined from the refractive index and density of the cleaning agent whose amount of water is unknown. In addition, although the measurement temperature of refractive index is not specifically limited, when calculating a moisture content with the calibration curve of Formula (1), the conversion value in predetermined | prescribed temperature (for example, 20 degreeC) from a viewpoint of calculating an exact moisture content. It is desirable to use Although the density measurement temperature is not particularly limited, it is desirable to use a conversion value at a predetermined temperature (for example, 15 ° C.) in the calibration curve of the formula (1) from the viewpoint of calculating an accurate moisture amount. The calibration curve of formula (1) can also include terms such as capacitance, electrical conductivity, infrared absorbance, and turbidity.

  The water content of the cleaning agent according to the present invention can be measured manually using various refractometers, density meters, etc., but can also be measured with a measuring apparatus as shown in FIG. FIG. 1 is a block diagram showing an outline of a cleaning agent moisture measuring apparatus 100 according to an embodiment of the present invention. As shown in FIG. 1, the moisture measuring device 100 includes a refractive index measuring unit 1 that measures the refractive index of the cleaning agent, a density measuring unit 2 that measures the density of the cleaning agent, and a moisture content of the cleaning agent that is created in advance. Is stored in the storage unit 3 using the storage unit 3 for storing a calibration curve based on the correlation between the refractive index and the density and the refractive index and the density of the cleaning agent measured by the refractive index measurement unit 1 and the density measurement unit 2. The apparatus includes a moisture calculation unit 4 that calculates a moisture amount based on the calibration curve, an output unit 5 that outputs the moisture content of the cleaning agent calculated by the moisture calculation unit 4, and a control unit 6 that controls each unit.

  The calibration curve stored in the storage unit 3 is preferably a calibration curve created in accordance with the cleaning conditions (dirt component to be cleaned) of the client, but is not corrected by the stain component, that is, the stain component non-correction. It is also possible to store the calibration curve created in the presence, and then correct the calibration curve based on the refractive index, density, and corresponding moisture value obtained during running.

  In addition, by attaching the moisture measuring device 100 on the line of the cleaning device, if the moisture value is calculated to be equal to or less than a predetermined value based on the moisture value calculated by the moisture calculating unit 4, the moisture connected to the cleaning device When water is supplied from the supply line to the cleaning device, or when the water value is calculated to be greater than or equal to a predetermined value, the cleaning solution in the cleaning device can be replaced or the water can be automatically removed from the cleaning solution. it can.

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

Example 1
“NS Clean” (registered trademark) 100M (manufactured by JX Nippon Mining & Energy Co., Ltd.), which is a W / O microemulsion type detergent containing a surfactant and water (10% by mass) in an aliphatic hydrocarbon No. 1), “NS Clean” (registered trademark) 100M, and the amount of the surfactant is the same, and the amount of water blended is 5% by mass. Samples (No. 3 to No. 12) to which various stain components shown in Table 1 were added were prepared, and the refractive index at 20 ° C., the density at 15 ° C., and the moisture content by the KF method were measured. The soil component concentration and water content of each sample (No. 3 to No. 12) 1 and / or sample no. 2 was adjusted by adding various soil components and moisture as required.

＊１ スーパーマルパスＤＸ１５０、ＪＸ日鉱日石エネルギー（株）製
＊２ ユニソルブルＥＭ、ＪＸ日鉱日石エネルギー（株）製
＊３ ユニソルブルＣＳ、ＪＸ日鉱日石エネルギー（株）製
＊４ ダフニーサーミックオイル３２、出光興産(株）製

* 1 Super Malpas DX150, manufactured by JX Nippon Oil & Energy Corporation * 2 Unisolvable EM, manufactured by JX Nippon Oil & Energy * 3 Unisolvable CS, manufactured by JX Nippon Oil & Energy * 4 Daphne Thermic Oil 32 Made by Idemitsu Kosan Co., Ltd.

  A calibration curve (regression equation) representing the correlation between the refractive index, density, and moisture content measured in Example 1 was created, and the moisture content was calculated using the created calibration curve, refractive index, and density. Table 2 shows the moisture content obtained from the calibration curve representing the correlation between the refractive index, density and moisture content of the sample based on “NS Clean” (registered trademark) 100M, and the moisture content measured by the KF method. FIG. 2 is a graph showing the relationship between the moisture content of the cleaning agent calculated by the moisture measurement method according to the present invention and the moisture content determined by the KF method. The x mark in FIG. 2 is a sample based on “NS Clean” (registered trademark) 100M. As shown in FIG. 2, it can be seen that the moisture content of the cleaning agent calculated by the moisture measurement method according to the present invention and the moisture content determined by the KF method are correlated. The multiple correlation between the moisture content of the cleaning agent (NS Clean 100M) obtained from the moisture measurement method according to the present invention and the moisture content measured by the KF method was 0.9742.

(Example 2)
"NS Clean" (registered trademark) 220M (manufactured by JX Nippon Mining & Energy Co., Ltd.), which is a W / O microemulsion type detergent containing a surfactant and water (10% by mass) in an aliphatic hydrocarbon No. 13), “NS Clean” (registered trademark) 220M and the amount of the surfactant are the same, and the blending amount of water is 5% by mass. 14 were prepared samples (No. 15 to No. 23) to which various soil components shown in Table 3 were added, and the refractive index at 20 ° C., the density at 15 ° C., and the moisture content by the KF method were measured. The soil component concentration and the water content of each sample (No. 15 to No. 23) are as follows. 13 and / or sample no. No. 14 was adjusted by adding various soil components and moisture as required.

＊１ スーパーマルパスＤＸ１５０、ＪＸ日鉱日石エネルギー（株）製
＊２ ユニソルブルＥＭ、ＪＸ日鉱日石エネルギー（株）製
＊３ ユニソルブルＣＳ、ＪＸ日鉱日石エネルギー（株）製
＊４ ダフニーサーミックオイル３２、出光興産(株）製

* 1 Super Malpas DX150, manufactured by JX Nippon Oil & Energy Corporation * 2 Unisolvable EM, manufactured by JX Nippon Oil & Energy * 3 Unisolvable CS, manufactured by JX Nippon Oil & Energy * 4 Daphne Thermic Oil 32 Made by Idemitsu Kosan Co., Ltd.

  A calibration curve (regression equation) representing the correlation between the refractive index, density, and moisture content measured in Example 2 was created, and the moisture content was calculated using the created calibration curve, refractive index, and density. Table 4 shows the amount of water obtained from the calibration curve representing the correlation between the refractive index, density and water content of the sample based on “NS Clean” (registered trademark) 220M, and the water content measured by the KF method. FIG. 2 is a graph showing the relationship between the moisture content of the cleaning agent calculated by the moisture measurement method according to the present invention and the moisture content determined by the KF method. A circle in FIG. 2 is a sample based on “NS Clean” (registered trademark) 220M. As shown in FIG. 2, it can be seen that the moisture content of the cleaning agent calculated by the moisture measurement method according to the present invention and the moisture content determined by the KF method are correlated. The multiple correlation between the moisture content of the cleaning agent (NS Clean 220M) obtained from the moisture measurement method according to the present invention and the moisture content measured by the KF method was 0.9774.

(Comparative Example 1)
A calibration curve (regression equation) representing the correlation between the refractive index measured in Example 1 and the moisture content was created, and the moisture content was calculated using the created calibration curve and the refractive index. Table 5 shows the moisture content obtained from the calibration curve representing the correlation between the refractive index and the moisture content of the sample based on “NS Clean” (registered trademark) 100M, and the moisture content measured by the KF method. FIG. 3 is a graph showing the relationship between the amount of water calculated based on a calibration curve created from only the refractive index and the amount of water obtained by the KF method. The x mark in FIG. 3 is a sample based on “NS Clean” (registered trademark) 100M. As shown in FIG. 3, it can be seen that the amount of water calculated based on the calibration curve created from the refractive index alone is not correlated with the amount of water obtained by the KF method. The multiple correlation between the moisture content of the cleaning agent (NS Clean 100M) obtained from the calibration curve based on the correlation between the refractive index and the moisture content and the moisture content measured by the KF method was 0.3709.

(Comparative Example 2)
A calibration curve (regression equation) representing the correlation between density and moisture content measured in Example 1 was created, and the moisture content was calculated using the created calibration curve and density. Table 6 shows the moisture content obtained from the calibration curve representing the correlation between the density and moisture content of the sample based on “NS Clean” (registered trademark) 100M and the moisture content measured by the KF method. FIG. 4 is a graph showing the relationship between the amount of water calculated based on a calibration curve created only from the density and the amount of water obtained by the KF method. The x mark in FIG. 4 is a sample based on “NS Clean” (registered trademark) 100M. As shown in FIG. 4, it can be seen that the water content calculated based on the calibration curve created from the density alone is not correlated with the water content determined by the KF method. The multiple correlation between the moisture content of the cleaning agent (NS Clean 100M) obtained from the calibration curve based on the correlation between the density and the moisture content and the moisture content measured by the KF method was 0.3942.

(Comparative Example 3)
A calibration curve (regression equation) representing the correlation between the refractive index and water content measured in Example 2 was created, and the water content was calculated using the created calibration curve and refractive index. Table 7 shows the moisture content obtained from the calibration curve representing the correlation between the refractive index and the moisture content of the sample based on “NS Clean” (registered trademark) 220M, and the moisture content measured by the KF method. FIG. 3 is a graph showing the relationship between the amount of water calculated based on a calibration curve created from only the refractive index and the amount of water obtained by the KF method. A circle in FIG. 3 is a sample based on “NS Clean” (registered trademark) 220M. As shown in FIG. 3, it can be seen that the amount of water calculated based on the calibration curve created from the refractive index alone is not correlated with the amount of water obtained by the KF method. The multiple correlation between the moisture content of the cleaning agent (NS Clean 220M) obtained from the calibration curve based on the correlation between the refractive index and the moisture content and the moisture content measured by the KF method was 0.3965.

(Comparative Example 4)
A calibration curve (regression equation) representing the correlation between density and moisture content measured in Example 2 was created, and the moisture content was calculated using the created calibration curve and density. Table 8 shows the moisture content obtained from the calibration curve representing the correlation between the density and moisture content of the sample based on “NS Clean” (registered trademark) 220M and the moisture content measured by the KF method. FIG. 4 is a graph showing the relationship between the amount of water calculated based on a calibration curve created only from the density and the amount of water obtained by the KF method. A circle mark in FIG. 4 is a sample based on “NS Clean” (registered trademark) 220M. As shown in FIG. 4, it can be seen that the water content calculated based on the calibration curve created from the density alone is not correlated with the water content determined by the KF method. The multiple correlation between the moisture content of the cleaning agent (NS Clean 220M) obtained from the calibration curve based on the correlation between the density and the moisture content and the moisture content measured by the KF method was 0.4519.

  As described above, the cleaning agent moisture measuring method and the cleaning agent moisture measuring device according to the present invention are useful for measuring the moisture content of the cleaning agent into which the soil component is introduced, and in particular, the cleaning performance depends on the moisture content of the cleaning agent. Suitable for moisture measurement of fluctuating W / O microemulsion type detergent.

DESCRIPTION OF SYMBOLS 1 Refractive index measuring part 2 Density measuring part 3 Memory | storage part 4 Moisture calculating part 5 Output part 6 Control part 100 Moisture measuring apparatus

Claims (5)

In the cleaning agent (A) containing water in a proportion of 1% by weight or more and less than 50% by weight, or in the cleaning agent (B) substantially free of water but miscible with moisture from the soil component A method for measuring moisture,
Measuring the refractive index of the cleaning agent (A) or (B);
Measuring the density of the cleaning agent (A) or (B);
A calculation step of calculating the moisture content by a calibration curve based on the correlation between the moisture content of the cleaning agent (A) or (B) prepared in advance and the refractive index and density;
A method for measuring a moisture content of a cleaning agent, comprising:   The cleaning agent (A) is a cleaning agent (A1) mainly composed of water and a polar solvent soluble in water, or a cleaning agent (A2) mainly composed of water, a nonpolar solvent and a surfactant. The method for measuring moisture content of the cleaning agent according to claim 1.   The density of the polar solvent and the nonpolar solvent is lower than that of water and a stain component to be washed, and the refractive index of the polar solvent and the nonpolar solvent is larger than that of water and smaller than that of the stain component to be washed. Item 3. A method for measuring moisture content of a cleaning agent according to Item 1 or 2.   The method for measuring moisture of a cleaning agent according to any one of claims 1 to 3, wherein the soil component to be cleaned with the cleaning agent (A) is an oily and / or aqueous processing oil. In the cleaning agent (A) containing water in a proportion of 1% by weight or more and less than 50% by weight, or in the cleaning agent (B) substantially free of water but miscible with moisture from the soil component A moisture measuring device,
A refractive index measuring unit for measuring the refractive index of the cleaning agent (A) or (B);
A density measuring unit for measuring the density of the cleaning agent (A) or (B);
A storage unit for storing a calibration curve based on the correlation between the water content of the cleaning agent (A) or (B) prepared in advance and the refractive index and density;
Moisture for calculating the amount of moisture based on the calibration curve stored in the storage unit using the refractive index and density of the cleaning agent (A) or (B) measured by the refractive index measurement unit and the density measurement unit A calculation unit;
A moisture measuring apparatus for a cleaning agent, comprising:

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