JP2020003449A - Quick-drying developer for liquid penetrant test and liquid penetrant test using the same - Google Patents

Abstract

To provide a developer in which: water does not penetrate into a developer layer by repelling water intruding from outside, therefore in a case of being used for a liquid penetrant test of a weld zone and the like in an outside structure, an opening flaw part can be accurately detected during rainfall time in the same accuracy as in fine weather; time of the liquid penetrant test can be shorten due to shortness of drying time; and a seller and a purchaser do not need to handle it with care because it is not controlled by ordinance on the Prevention of Organic Solvent Poisoning.SOLUTION: A quick-drying developer for a liquid penetrant test is a developer for a liquid penetrant test containing water soluble solvent of 5-95 wt.% and white inorganic impalpable powder of 5-30 wt.% in which the water soluble solvent is a volatile low-boiling water soluble solvent a boiling point of which is equal to or less than 155°C, and the white inorganic impalpable powder is made by blending 2 or more kinds of powder selected from white inorganic impalpable powder surface-treated by aliphatic acid, dimethylpolysiloxysilazane, or polydimethylsiloxane.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a quick-drying developer used for a penetrant test for detecting an opening defect on the surface of various metal members. Specifically, since the developer is a developer in which a white inorganic powder surface-treated with a hydrophobic group is dispersed in a solution containing a volatile low-boiling water-soluble solvent, the developer layer composed of the developer is Penetration inspection that can detect an opening defect part with the same high accuracy even in rainy weather as in clear weather in penetration inspections conducted outdoors because water entering from the outside is not repelled by penetrating water into the developer layer The present invention relates to a quick-drying developer.

  As is well known, the penetrant inspection is one type of non-destructive inspection method and is standardized in JIS Z 2343-1 to JIS Z 2343-6. The basic aspect of the method is that a dye-penetrating solution or a dye-penetrating solution (hereinafter referred to as a “penetrating solution”) in which a dye is dissolved is adhered to the surface of the inspection object and penetrated into the opening defect portion (penetration). Treatment), removing the excess permeate remaining on the surface of the inspection object without permeating into the opening defect portion (cleaning treatment), and then applying a white color such as a magnesium carbonate powder or a calcium carbonate powder on the surface of the inspection object. A penetrating liquid that forms a thin layer (hereinafter referred to as a “developer layer”) of inorganic fine powder (called “developer” by those skilled in the art) and penetrates into the opening defect portion by the developer layer To the surface of the developer layer to cause a defect indicating pattern to appear (development processing). In the case of a dyeing penetrant, observe images taken with the naked eye or a digital camera under natural light or white light, and In the case of fluorescent penetrant, Under morphism, is that detecting the presence, position, size of the aperture defect by observing images taken with a digital camera or the like by the defective indication pattern.

  The development in the penetrant inspection test means that the penetrating liquid remaining in the opening defect portion is caused by a capillary phenomenon caused by a space between particles contained in the developer layer (hereinafter referred to as “developer particles”). Since it is intended to extract a defect on the surface and detect a defective portion by the pattern at the time of the extraction, it is essential that a space exists between particles in order to obtain a clear defect indicating pattern.

  To ensure the space between developer particles, the developer layer needs to be dry, but penetrant inspection of welded parts of outdoor structures such as oil plants, oil tanks, nuclear power plants, etc. In the test, the developer layer can be dried when the weather is fine, but the developer layer is wet when it rains, so the space between the developer particles is filled with water, and the penetrating liquid remaining in the opening defect portion Is not accurately drawn out, and a clear defect indication pattern cannot be obtained, so that there is a problem that the accuracy of the penetrating inspection test is reduced.

  Further, if a large amount of water enters, the developer layer is peeled off, so that there is a problem that development cannot be performed.

  In the case of a developer in which developer particles are dispersed in a non-aqueous solution such as ethyl acetate, even if external water such as rainfall enters the surface of the developer layer, water is repelled on the surface of the developer layer, It is known that the developer does not penetrate, so that the space between the developer particles can be maintained, and a clear defect indicating pattern can be obtained.

  However, ethyl acetate is subject to regulations under the Organic Solvent Poisoning Prevention Act, and sellers and buyers need to handle with care.

  Therefore, in the case of a developer using a solution that is not regulated by the Organic Solvent Poisoning Prevention Law and the like, it does not permeate the developer layer by repelling water that enters from the outside such as rainfall, etc. It is desired to develop a developer that can detect an opening defect with the same high accuracy as in fine weather even during rainfall, has a short drying time, and can reduce the time required for a penetration test.

JP-A-6-317541

  Patent Document 1 discloses an aerosol-type quick-drying developer in which a white inorganic fine powder is dispersed in a volatile low-boiling organic solvent.

  The quick-drying type developer disclosed in Patent Document 1 uses a volatile low-boiling organic solvent, so that the drying time is short and a uniform developer layer can be formed. Solvents may be subject to regulations under the Organic Solvent Poisoning Prevention Law, and thus have a problem that sellers and purchasers must pay attention to handling.

  The inventors of the present invention have made a technical problem to solve the above-mentioned problems, and as a result of repeated trial and error of many trial productions and experiments, as a result, a water-soluble solvent of 5 to 95% by weight and a white inorganic fine powder of 5 to 30% % By weight, wherein the water-soluble solvent is a volatile low-boiling water-soluble solvent having a boiling point of 155 ° C. or less, and the white inorganic fine powder is a fatty acid or dimethylpolysiloxy. If it is a quick-drying developer for penetrant testing that is a white inorganic fine powder obtained by mixing two or more selected from white inorganic fine powders surface-treated with silazane or polydimethylsiloxane, Flicking, because it does not penetrate the developer layer, when used for penetration testing of outdoor structures, even if it is raining, it is a developer that can detect the opening defect part with the same high accuracy as in fine weather, Drying time is short It is hoped that the test time for penetration testing can be shortened and that it is not regulated by the Organic Solvent Poisoning Prevention Law. Thus, the above technical problem has been achieved.

  The technical problem can be solved by the present invention as follows.

  The present invention is a developer for a penetrant flaw detection test containing 5 to 95% by weight of a water-soluble solvent and 5 to 30% by weight of a white inorganic fine powder, wherein the water-soluble solvent has a boiling point of 155 ° C. or less. A low-boiling water-soluble solvent, wherein the white inorganic fine powder is a white inorganic fine powder obtained by mixing two or more selected from white inorganic fine powders surface-treated with a fatty acid or dimethylpolysiloxysilazane or polydimethylsiloxane; This is a quick-drying developer for a penetration test.

  Further, the present invention is the above quick-drying developer for a penetrant flaw detection test, wherein the volatile low-boiling water-soluble solvent is a volatile low-boiling water-soluble solvent containing at least ethanol.

  Further, the present invention is the quick-drying developer for the penetrant flaw detection test, wherein the white inorganic fine powder to be subjected to the surface treatment is at least one selected from calcium carbonate, talc, and silicon dioxide.

  Further, the present invention is a penetrant testing method using the above-mentioned quick-drying developer for penetrant testing.

  Since the developer in the present invention uses a solution containing a volatile low-boiling water-soluble solvent having a boiling point of 155 ° C. or less, it is a fast-drying developer with a short drying time, and the solution is not toxic to organic solvents. It is not a solution subject to prophylaxis, so it can be used by sellers and buyers without care.

  Further, the quick-drying developer in the present invention has two or more kinds of white inorganic fine powders surface-treated with a fatty acid or dimethylpolysiloxysilazane or polydimethylsiloxane dispersed therein, so that the surface of the developer layer is Becomes hydrophobic and repels water that enters from the outside and does not penetrate the developer layer, so that the space between the developer particles can be maintained, and the developer layer does not peel off due to external water Thus, a clear defect indicating pattern can be obtained.

  Therefore, the quick-drying developer according to the present invention is a developer that can detect an opening defect part with the same high accuracy as in fine weather even when it rains, so that it can be suitably used for an outdoor penetration test. .

  If calcium carbonate, talc, or silicon dioxide is used as the white inorganic fine powder to be subjected to the surface treatment, the developer becomes more opaque, so that a clearer defect indication pattern can be obtained.

It is a comparison of the developer layer of Example and the comparative example when water is dropped.

  The fast-drying developer in the present invention contains 5 to 95% by weight of a volatile low-boiling water-soluble solvent having a boiling point of 155 ° C. or less.

  Examples of the volatile low-boiling water-soluble solvent in the present invention include ethanol (boiling point 78.37 ° C.), isopropyl alcohol (boiling point 82.6 ° C.), normal propyl alcohol (boiling point 97 ° C.), ethyl lactate (boiling point 154 ° C.), propylene It preferably contains glycol monomethyl ether (boiling point: 120 ° C.), and particularly preferably contains ethanol.

  Also, commercially available neoethanol PIP (manufactured by Daishin Chemical Co., Ltd.) containing ethanol, isopropyl alcohol and normal propyl alcohol can be suitably used.

  The boiling point of the volatile low-boiling water-soluble solvent in the present invention is preferably 155 ° C or lower, more preferably 75 ° C to 155 ° C.

  If the boiling point exceeds 155 ° C., the drying time of the developer becomes longer.

  The content of the volatile low-boiling water-soluble solvent in the present invention is 5 to 95% by weight, and more preferably 20 to 85% by weight.

  If it is less than 5% by weight, the white inorganic fine powder having a hydrophobic surface treatment is difficult to disperse, and it is difficult to form a uniform developer layer. This is because the property is deteriorated, and a clear defect indicating pattern cannot be obtained, and the drying time becomes longer.

  As the quick-drying developer in the present invention, a white inorganic fine powder obtained by mixing two or more kinds of white inorganic fine powders that have been surface-treated with any of fatty acid, dimethylpolysiloxysilazane, and polydimethylsiloxane is used.

  When the surface-treated white inorganic fine powder is used, the surface of the developer layer becomes hydrophobic, so that water from the outside is repelled and does not permeate the developer layer, so that the space between the developer particles is maintained. And a clear defect indicating pattern can be obtained.

  Further, there is no possibility that the developer layer is peeled off by water from the outside and development cannot be performed.

  Examples of the white inorganic fine powder to be subjected to the surface treatment include calcium carbonate, talc, and silicon dioxide.

  Examples of the surface-treated white inorganic fine powder of the present invention include MSK-P (manufactured by Maruo Calcium Co., Ltd.) in which calcium carbonate is surface-treated with a fatty acid, and Silohobic (registered trademark) in which silicon dioxide is surface-treated with polydimethylsiloxane. 200 (manufactured by Fuji Silysia Chemical Ltd.) and CT-8 (manufactured by Asada Flour Milling Co., Ltd.) obtained by treating talc with dimethylpolysiloxysilazane.

  The content of the surface-treated white inorganic fine powder in the present invention is 5 to 30% by weight, and more preferably 8 to 20% by weight.

  If the content of the surface-treated white inorganic fine powder is less than 5% by weight, the concealing property is low and the water does not repel enough. In a penetrant inspection test, a clear defect indication pattern may not be easily obtained, or the developer layer may be peeled off. When the content exceeds 30% by weight, a developer layer having a uniform thickness cannot be formed. This is because the accuracy of the penetration test may be reduced.

  The quick-drying developer according to the invention can be suitably used for detecting an opening defect of 30 to 50 μm.

  1 shows an embodiment of a penetration testing method using a quick-drying developer according to the present invention.

  First, a dye infiltration solution is applied to the surface of an inspection object such as a welded portion of an outdoor structure, and penetrates into an opening defect (penetration treatment).

  Next, the surface of the object to be inspected is treated with a cleaning agent such as tap water or Ecocheck (registered trademark) UR-ST (manufactured by Marktec Co., Ltd.), and the surface of the object to be inspected is not penetrated into the opening defect portion by a waste cloth. The remaining excess permeate is washed and removed (washing process).

  Apply the quick-drying developer in the present invention to the surface of the inspection object, under natural light, visually, or after photographing with a digital camera or the like, by observing the defect indicating pattern, the number of opening defects, size, Detect shapes, etc.

  The present invention will be described in more detail with reference to Examples and Comparative Examples, but the present invention is not limited thereto.

  Using the raw materials shown in Tables 1 and 2, respective developers of Examples and Comparative Examples of the present invention were produced.

(Concealment)
When the opacity is equal to or higher than that of a commercially available developer (Super Check (registered trademark) UD-ST / Marktech Co., Ltd.), and when the opacity is lower than that of the commercially available developer, The evaluation was made as x.

(Detectability of 50 μm)
As a test piece, a type 1 contrast test piece (50 μm) was used.
Super Check (registered trademark) UP-ST (J) was used as a dye permeating solution, and Super Check (registered trademark) UR-ST (both manufactured by Mark Tech Co., Ltd.) was used as a remover.

  Each of the developers in Examples and Comparative Examples was used after mixing at a ratio of developer: LP gas = 1: 1, and then filling test bottles.

A permeate was applied to the test piece by a spray method. The permeation time was 5 minutes (permeation treatment).
Thereafter, the excess permeate was removed with a dry rag. It was removed again with a waste to which a small amount of remover was applied (cleaning treatment).
Each of the developers of Examples and Comparative Examples was applied to a test piece by a spray method (development processing).
Photographs were taken with a digital camera under white light, and observed with the naked eye.

  A test piece in which 90% or more of the type 1 comparative test piece (50 μm) was detected was evaluated as Δ, and a test piece in which 90% or more was not detected was evaluated as ×.

(Water resistance)
A few drops of water were dropped on a test piece coated with each of the above-mentioned developers with a spoid and observed.

  The evaluation was made as 〇 when the developer layer was not peeled off without wetting, △ when the developer layer was not wet but peeled off, and × when the developer layer was wet.

(Organic solvent poisoning prevention regulations)
Those that do not fall under the rules for the prevention of organic solvent poisoning are indicated by a triangle.
In addition, only the comparative example corresponds to the organic solvent poisoning prevention rule in the comparative example.

  Tables 3 to 7 show the compositions and evaluations of the respective developers in Examples and Comparative Examples.

  As can be seen from Tables 3 to 7, the quick-drying developer according to the present invention has concealing properties, does not penetrate into the developer layer even when water is dropped, does not peel off the developer layer, and has high accuracy in opening defects. It was proved to be a developer capable of detecting a part.

The quick-drying developer in the present invention repels water from the outside and does not permeate the developer layer, so even during rainfall, it is a developer that can detect an opening defect portion with the same high accuracy as in fine weather. And a developer that can be suitably used for a penetration test for a welded portion of an outdoor structure or the like.
In addition, since a volatile low-boiling water-soluble solvent having a boiling point of 155 ° C. or less is used, the drying time is short, so that the developer can be expected to shorten the penetration test time.
In addition, since it is not subject to regulations such as the Organic Solvent Poisoning Prevention Law, it is a developer that does not require a seller or user to take care of handling.
Therefore, it can be said that the industrial applicability of the present invention is high.

Claims (4)

A developer for a penetrant flaw detection test containing 5 to 95% by weight of a water-soluble solvent and 5 to 30% by weight of a white inorganic fine powder, wherein the water-soluble solvent has a volatile low boiling point water solubility of 155 ° C or lower. A solvent, wherein the white inorganic fine powder is a white inorganic fine powder obtained by mixing two or more selected from white inorganic fine powders surface-treated with a fatty acid or dimethylpolysiloxysilazane or polydimethylsiloxane; Quick drying developer for testing. The quick-drying developer for a penetrant detection test according to claim 1, wherein the volatile low-boiling water-soluble solvent is a volatile low-boiling water-soluble solvent containing at least ethanol. 3. The quick-drying developer for a penetrant flaw detection test according to claim 1, wherein the white inorganic fine powder to be subjected to the surface treatment is at least one selected from calcium carbonate, talc, and silicon dioxide. A penetration testing method using the quick-drying developer for penetration testing according to any one of claims 1 to 3.