Cleaning water for penetrant testing containing water-soluble preservative and method for producing the same

Abstract

Provided is cleaning water for penetrant testing that is performed using a water-insoluble penetrant, the cleaning water containing a water-soluble preservative so that the water does not rot, the preservative being difficult to dissolve in the water-insoluble penetrant so that the sensitivity and cleanability of the penetrant testing are not affected, the cleaning water after the penetrant testing being capable of being subjected to oil-water separation, and the cleaning water being capable of being used as cleaning water for repeated penetrant testing because solid matter such as biofilm is not generated even when the water layer is repeatedly used again as cleaning water.SOLUTION: The cleaning water is used for the penetrant test using a water-insoluble penetrant containing 0.0001 wt.% or more and 0.5 wt.% or less of a water-soluble organic nitrogen sulfur compound and / or a halogenated organic nitrogen-containing compound.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to cleaning water for penetrant testing using a non-aqueous penetrant. Specifically, the cleaning water contains a water-soluble preservative, which prevents the water from spoiling. Furthermore, the preservative is not easily dissolved in the non-aqueous penetrant, which does not affect the sensitivity or cleanability of the penetrant testing. Furthermore, the cleaning water after penetrant testing can be separated into oil and water, and even if the aqueous layer is reused as cleaning water, no solid matter such as biofilms will form. Therefore, the cleaning water can be used repeatedly as cleaning water for penetrant testing, significantly reducing the amount of waste cleaning water. [Background technology]

[0002] As is well known, penetrant testing is a type of nondestructive testing method, and is standardized in JIS Z 2343-1 to 6. Its basic configuration involves applying a highly penetrating dye penetrant or fluorescent penetrant, containing a dissolved dye, to the surface of an object to be inspected and allowing it to penetrate into the open defect, removing any excess penetrant that has not penetrated into the defect and remains on the surface of the object to be inspected, forming a thin layer of inorganic white powder (known as a "developer" among those skilled in the art) such as magnesium carbonate powder or calcium carbonate powder on the surface of the object to allow the penetrant that has penetrated into the open defect to be drawn to the surface of the developer layer, thereby revealing a defect indication pattern, which can be observed with the naked eye or an image taken with a digital camera or the like under natural or white light in the case of dye penetrant testing, or under the illumination of a black light or the like in the case of fluorescent penetrant testing, and detecting the presence and location of the open defect from the defect indication pattern.

[0003] There is a method of removing excess penetrant remaining on the surface of the test object with water.

[0004] When performing penetrant testing on mass-produced parts such as automobile parts, large amounts of water must be used, but the cleaning water containing excess penetrant must be treated as industrial waste, resulting in huge disposal costs.

[0005] In view of the above problems, a method has been developed in which the water layer obtained by separating the oil from the wash water produced by the penetrant test is reused as wash water for washing away excess penetrant.

[0006] However, if the water is reused repeatedly, it will decay, producing slime-like substances and solids such as biofilms, which can clog the separation membranes used to separate oil and water.

[0007] Furthermore, the generated solid components may adhere to the open defect and affect the sensitivity of the penetrant testing.

[0008] Adding a preservative can prevent the water from spoiling, but it may make it difficult to separate the water layer from the oil layer, and may prevent complete separation of the oil and water.

[0009] Furthermore, if the preservative dissolves in the oil layer, it may affect the sensitivity of the penetrant test.

[0010] Furthermore, there is a risk that the sensitivity of the penetrant test, which is performed by using the oil layer obtained by oil-water separation again as a penetrant, may be affected.

[0011] Therefore, in a penetrant test using a non-aqueous penetrant, the cleaning water containing excess penetrant is completely separated by oil-water separation, so the oil layer and the water layer can be recovered, and the recovered water layer can be reused. There is a need to develop cleaning water that does not generate solid matter such as biofilms even when used repeatedly as cleaning water, eliminating the need to frequently replace separation membranes and that does not affect the sensitivity of penetrant testing. [Prior art documents] [Patent documents]

[0012] [Patent Document 1] Patent Publication No. 2024-87888 Summary of the Invention [Problem to be solved by the invention]

[0013] As disclosed in Patent Document 1, the applicant has developed a penetrant for penetrant testing in which oil-soluble dyes do not dissolve in water even when mixed with water.

[0014] In the case of the penetrant liquid for penetrant testing described in Patent Document 1, the oil-soluble dye does not dissolve in water even when mixed with water, so the cleaning water can be recovered, the oil and water separated, and the water layer recovered.Even if the water layer is used repeatedly as cleaning water, it does not become colored and can be reused an unlimited number of times.However, there is a problem in that the water will decay over repeated use, causing solid matter such as biofilms to form, clogging the separation membrane that separates oil and water, and requiring frequent replacement of the separation membrane.

[0015] Furthermore, if the generated solid matter adheres to the open defect, it may affect the sensitivity of the penetrant testing.

[0016] The inventors set out to solve the above-mentioned problems as a technical task, and as a result of numerous trial and error trials and experiments, they have made the remarkable discovery that, as long as the cleaning water for penetrant testing, which is performed using a non-aqueous penetrant, contains 0.0001% by weight or more and 0.5% by weight or less of water-soluble organic nitrogen-sulfur compounds and / or halogenated organic nitrogen-containing compounds, even if the recovered cleaning water is separated into oil and water and the water layer is repeatedly used as cleaning water, no solid matter such as biofilm will be generated, so there is no need to frequently replace the oil-water separation membrane, and further, the generated solid matter will not adhere to open defects, and further, the preservative is difficult to dissolve in the oil layer, so it will not affect the sensitivity of the penetrant testing, and thus the technical task has been achieved. [Means for solving the problem]

[0017] The present invention relates to cleaning water for use in penetrant testing using a non-aqueous penetrant liquid, which contains 0.0001% by weight or more and 0.5% by weight or less of a water-soluble organic nitrogen-sulfur compound and / or a halogenated organic nitrogen-containing compound.

[0018] The present invention also relates to the cleaning water, wherein the organic nitrogen-sulfur compound is 2-mercaptopyridine N-oxide sodium, 2-methyl-4-isothiazolin-3-one, or 1,2-benzisothiazol-3-one, and the halogenated organic nitrogen-containing compound is 5-chloro-2-methyl-4-isothiazolin-3-one, polyhexamethylene biguanide hydrochloride, 3-iodo-2-propargyl butylcarbamic acid, 2-bromo-2-nitro-1,3-propanediol, or 2,2-dibromo-2-nitroethanol.

[0019] The present invention also relates to the cleaning water, which is recovered after a penetrant test and reused.

[0020] The present invention also relates to the preservative for cleaning water, which contains a water-soluble organic nitrogen-sulfur compound and / or a halogenated organic nitrogen-containing compound liquid.

[0021] The present invention also relates to a method for producing the cleaning water, which is produced by diluting the preservative with water.

[0022] The present invention also provides a method for penetrant testing using the above-mentioned cleaning water. [Effects of the Invention]

[0023] The cleaning water of the present invention does not decay because it contains water-soluble organic nitrogen-sulfur compounds and halogenated organic nitrogen-containing compounds, and therefore does not produce solid matter such as biofilms. Therefore, even if the cleaning water is recovered after the penetrant testing, and the oil-water separation is performed to repeatedly use the water layer as cleaning water, the separation membrane is unlikely to clog, and there is no need to frequently replace the separation membrane.

[0024] Furthermore, since no solid matter adheres to the open defect, repeated use of cleaning water does not affect the sensitivity of the penetrant testing.

[0025] Furthermore, since the cleaning water can be reused, the amount of cleaning water that is discarded can be significantly reduced.

[0026] Furthermore, water-soluble organic nitrogen-sulfur compounds and halogenated organic nitrogen-containing compounds are difficult to dissolve in the oil layer and do not affect the sensitivity of the penetrant testing.

[0027] Furthermore, even if the oil layer recovered after oil-water separation is reused as the penetrant for the penetrant testing, the sensitivity of the penetrant testing will not be affected.

[0028] Furthermore, since the organic nitrogen-sulfur-based compound and the halogenated organic nitrogen-containing compound are hardly dissolved in the oil layer, the concentration of the organic nitrogen-sulfur-based compound and the halogenated organic nitrogen-containing compound are hardly reduced even when the cleaning water is repeatedly used, and therefore there is no need to readjust the concentration of the organic nitrogen-sulfur-based compound and the halogenated organic nitrogen-containing compound even when the cleaning water is repeatedly used.

[0029] Furthermore, if the preservative contains a high concentration of an organic nitrogen-sulfur compound or a halogenated organic nitrogen-containing compound, the wash water of the present invention can be produced simply by diluting it with water. DETAILED DESCRIPTION OF THE INVENTION

[0030] The washing water in the present invention preferably contains 0.0001 to 0.5% by weight, more preferably 0.0001 to 0.10% by weight, of a water-soluble organic nitrogen-sulfur compound and / or a halogenated organic nitrogen-containing compound.

[0031] If the content is less than 0.0001% by weight, the antiseptic effect will be low and repeated use may result in the formation of solid matter such as biofilms. If the content is 0.5% by weight or more, the sensitivity of penetrant testing and cleaning properties may be affected.

[0032] The organic nitrogen-sulfur compound in the present invention is not particularly limited as long as it is water-soluble.

[0033] Examples of organic nitrogen-sulfur compounds include 2-mercaptopyridine N-oxide sodium, 2-methyl-4-isothiazolin-3-one, and 1,2-benzisothiazol-3-one.

[0034] The halogenated organic nitrogen-containing compound in the present invention is not particularly limited as long as it is water-soluble.

[0035] Examples of halogenated organic nitrogen-containing compounds include 5-chloro-2-methyl-4-isothiazolin-3-one, polyhexamethylene biguanide hydrochloride, 3-iodo-2-propargylbutylcarbamic acid, 2-bromo-2-nitro-1,3-propanediol, and 2,2-dibromo-2-nitroethanol.

[0036] The cleaning water of the present invention can be prepared by the simple method of preparing a preservative in which the organic nitrogen-sulfur compound or the halogenated organic nitrogen-containing compound is dissolved in water at a high concentration in advance, and then diluting it with water.

[0037] The concentration of the organic nitrogen-sulfur compound or halogenated organic nitrogen-containing compound as a preservative may be adjusted as desired, but is preferably 0.01% by weight to 0.50% by weight.

[0038] The penetrant used together with the wash water in the present invention is not limited as long as it is water-insoluble, but a penetrant in which the oil-soluble dye does not dissolve in the water layer is preferred.

[0039] If the oil-soluble dye dissolves in water, the water layer will develop color as the cleaning water is used repeatedly, which will reduce the sensitivity of the penetrant test and the cleaning ability.

[0040] This is because, if the penetrant liquid does not dissolve the oil-soluble dye in the water layer, it can be used repeatedly in penetrant testing by using it with the cleaning water of the present invention, and the sensitivity and cleaning ability of the penetrant testing do not decrease even when it is used repeatedly.

[0041] An example of a penetrant liquid in which oil-soluble dyes do not dissolve in the water layer is the penetrant liquid described in Patent Document 1. [Example]

[0042] The present invention will be described in more detail with reference to examples and comparative examples, but the present invention is not limited to these. It's not something like that.

[0043] (penetrating liquid) A penetrant solution was prepared by mixing trixylenyl phosphate (manufactured by Daihachi Chemical Industry Co., Ltd.) or diethylene glycol monobutyl ether (manufactured by Tokyo Chemical Industry Co., Ltd.) as a base solvent, SOLEVET YELLOW 116 (manufactured by Orient Chemical Industry Co., Ltd.) and Nikkaflow SC200 (manufactured by Nippon Chemical Industry Co., Ltd.) in a 1:1 ratio as an oil-soluble fluorescent dye, and Exxol D80 (manufactured by ExxonMobil Chemical Corp.) naphthenic solvent and normal dodecane in a 1:1 ratio as a dilution solvent, as shown in Tables 1 and 2.

[0044] (washing water) As the organic nitrogen-sulfur compound, 2-mercaptopyridine N-oxide sodium (manufactured by Tokyo Chemical Industry Co., Ltd.) or 2-methyl-4-isothiazolin-3-one (manufactured by Combi-Blocks) was used.

[0045] As the halogenated organic nitrogen-containing compound, 2-bromo-2-nitro-1,3-propanediol (manufactured by Tokyo Chemical Industry Co., Ltd.) or 2,2-dibromo-2-nitroethanol (manufactured by Angene International Limited) was used.

[0046] In the comparative examples, instead of the organic nitrogen-sulfur-based compound, triethanolamine (manufactured by Tokyo Chemical Industry Co., Ltd.), N-[3-(1-ethyl-1-methylpropyl)-1·2-oxazol-5-yl]-2·6-dimethoxybenzamide (manufactured by Angene International Limited), or methylene bismorpholine (manufactured by The Lubrizol Japan Co., Ltd.) was used as the organic nitrogen compound, and phenoxyethanol (manufactured by Tokyo Chemical Industry Co., Ltd.) or ethylenedioxydimethanol (manufactured by The Lubrizol Japan Co., Ltd.) was used as the organic compound.

[0047] (Dissolution of oil-soluble fluorescent dyes) All the ingredients of the penetrant were added, mixed and stirred, and it was visually confirmed whether the oil-soluble fluorescent dye had dissolved. If the sample was completely dissolved, it was marked as ◯, if it was not dissolved, it was marked as x, and no other evaluations were made. Those that were not evaluated are indicated as (N / A).

[0048] (Sensitivity test) The sensitivity test was carried out on the Type 3 reference specimen as follows.

[0049] (1) Penetration treatment: The penetrating liquid was applied to the surface of the test piece by brushing and allowed to penetrate for 5 minutes. (2) Cleaning treatment: The cleaning water from each of the examples and comparative examples was sprayed at a water pressure of 0.2 MPa while checking the cleaning state by turning on ultraviolet light from an ultraviolet irradiation lamp Super Light D-10L (manufactured by Marktec Co., Ltd.). (3) Drying treatment: The test piece was placed in a hot air circulation dryer and dried at a drying temperature of 70°C for 10 minutes. (4) Observation: The indication pattern at the opening defect of the test piece was irradiated with ultraviolet light using a Super Light D-10L ultraviolet irradiation lamp (manufactured by Marktec Co., Ltd.) and confirmed with the naked eye.

[0050] The cases where all the open defects were detected were evaluated as ◯, and the cases where some of the open defects were not detected were evaluated as ×.

[0051] (cleanability) After the sensitivity test, the condition of the test piece was confirmed by irradiating it with ultraviolet light using a Super Light D-10L ultraviolet irradiation lamp (manufactured by Marktec Co., Ltd.).

[0052] The samples in which no afterglow was observed with the naked eye were evaluated as ◯, and the samples in which afterglow was observed were evaluated as ×.

[0053] (Confirmation of solid matter suppression by preservatives) 100 parts by mass of each of the cleaning waters of the Examples and Comparative Examples and 2 parts by mass of the penetrant solution of Example 1 were added to a container, and stirring was continued with a stirrer. The occurrence of solid matter due to putrefaction of the water over time was visually confirmed.

[0054] The samples in which no solid matter was generated for 10 days or more were evaluated as ◯, and the samples in which solid matter was generated within 10 days were evaluated as ×.

[0055] (separability) 50 parts by mass of each cleaning water and 1 part by mass of each penetrant were added to a container and stirred. After stirring was stopped, the penetrant and cleaning water were separated, and the penetrant and water were emulsified or dissolved without being separated.

[0056] The compositions and evaluations of the examples are shown in Table 1, and the compositions and evaluations of the comparative examples are shown in Table 2.

[0057] [Table 1]

[0058] [Table 2]

[0059] As shown in Table 1, it was confirmed that the cleaning water of the present invention does not reduce the sensitivity of the penetrant test, has excellent cleaning properties, does not produce solids such as biofilms, and completely separates oil and water even when mixed with the penetrant. [Industrial Applicability]

[0060] The cleaning water in the present invention contains a water-soluble preservative, so the water does not spoil, and the preservative is difficult to dissolve in a non-aqueous liquid, so it does not affect the sensitivity or cleaning properties of the penetrant testing.Furthermore, the cleaning water after the penetrant testing can be separated into oil and water, and even if the water layer is repeatedly used as cleaning water, no solid matter such as a biofilm is generated.Therefore, it can be used as cleaning water for repeated penetrant testing, and the amount of cleaning water discarded can be significantly reduced.This is cleaning water for penetrant testing performed using a non-aqueous penetrant liquid. Therefore, the present invention has high industrial applicability.

Claims

1. Cleaning water for penetrant testing using a non-aqueous penetrant liquid, containing 0.0001% by weight or more and 0.5% by weight or less of water-soluble organic nitrogen-sulfur compounds and / or halogenated organic nitrogen-containing compounds.

2. The cleaning water according to claim 1, wherein the organic nitrogen-sulfur compound is 2-mercaptopyridine N-oxide sodium, 2-methyl-4-isothiazolin-3-one, 1,2-benzisothiazol-3-one, and the halogenated organic nitrogen-containing compound is 5-chloro-2-methyl-4-isothiazolin-3-one, polyhexamethylene biguanide hydrochloride, 3-iodo-2-propargyl butylcarbamic acid, 2-bromo-2-nitro-1,3-propanediol, 2,2-dibromo-2-nitroethanol.

3. 3. The cleaning water according to claim 1, wherein the cleaning water is recovered after a penetrant test and reused.

4. 3. The antiseptic for washing water according to claim 1, which contains a water-soluble organic nitrogen-sulfur compound and / or a halogenated organic nitrogen-containing compound liquid.

5. 6. A method for producing the washing water according to claim 1 or 2, which is produced by diluting the preservative according to claim 4 with water.

6. A method for penetrant testing using the cleaning water according to claim 1 or 2.