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JP4362618B2 - Sheet metal flaw detection agent and flaw detection inspection method - Google Patents
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JP4362618B2 - Sheet metal flaw detection agent and flaw detection inspection method - Google Patents

Sheet metal flaw detection agent and flaw detection inspection method Download PDF

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JP4362618B2
JP4362618B2 JP2004070316A JP2004070316A JP4362618B2 JP 4362618 B2 JP4362618 B2 JP 4362618B2 JP 2004070316 A JP2004070316 A JP 2004070316A JP 2004070316 A JP2004070316 A JP 2004070316A JP 4362618 B2 JP4362618 B2 JP 4362618B2
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flaw detection
sheet metal
detection agent
ether
weight
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JP2005257512A (en
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泰亮 長谷川
喜弘 中部屋
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Neos Co Ltd
Toyota Auto Body Co Ltd
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Toyota Auto Body Co Ltd
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Description

本発明は、塗装前の板金表面に発生する微小な凹凸欠陥傷を反射によって容易に探すことができる探傷剤及びこれを用いた板金表面凹凸欠陥傷の探傷検査方法に関し、特に、塗装前の自動車の外装材として使用される鋼板表面に発生する微小な凹凸欠陥傷を容易に探すことができる探傷剤及びこれを用いた鋼板表面凹凸欠陥傷の探傷検査方法に関する。   The present invention relates to a flaw detection agent capable of easily searching for fine uneven defect scratches generated on a sheet metal surface before painting by reflection and a method for inspecting sheet metal surface uneven defects using the same, and more particularly to an automobile before painting. The present invention relates to a flaw detection agent capable of easily searching for a fine uneven defect scratch generated on the surface of a steel sheet used as an exterior material, and a flaw detection inspection method for a steel sheet surface uneven defect scratch using the same.

自動車ボディ鋼板の塗装工程において、鋼板表面の微妙な凹凸や欠陥傷は、塗装することで鋼板表面に光沢のムラ、塗りムラを生じる。このような欠陥が見つかると最悪の場合、塗膜を一旦除去した上で鋼板上の凹凸の修正を行い再塗装が必要となるため、余分な時間と経費を費やすことになる。この問題を解決するために、塗装前に鋼板表面の欠陥を見つけ修正する必要がある。この様な欠陥を見つける薬剤として、例えば特殊プレス油に蛍光染料等溶かした油タイプの探傷剤が用いられ、微小な凹凸を目視で見極めていた。しかし、この方法では鋼板表面に多量の油を塗布するため、後の脱脂工程に混入する油の量が増えて脱脂槽の液寿命が短くなってしまう欠点があった。更に、脱脂工程の前に水洗で簡単に洗い流せるような溶剤を用いた探傷剤も開発されているが、自動車ボディ鋼板表面に残存する塑性加工油等により、はじきを生じ鋼板表面に均一に塗布することができないという問題点を持っている。なお、探傷剤に蛍光染料、油溶性染料が使用されており、廃水処理に負荷をかけるという問題点がある。   In the coating process of automobile body steel plates, fine unevenness and defect scratches on the steel plate surface cause uneven gloss and uneven coating on the steel plate surface. If such a defect is found, in the worst case, the coating film is once removed, the unevenness on the steel plate is corrected and repainting is required, so that extra time and cost are consumed. In order to solve this problem, it is necessary to find and correct defects on the steel sheet surface before painting. As an agent for detecting such defects, for example, an oil type flaw detection agent in which a fluorescent dye or the like is dissolved in a special press oil is used, and minute irregularities are visually observed. However, in this method, since a large amount of oil is applied to the surface of the steel sheet, there is a drawback that the amount of oil mixed in the subsequent degreasing process is increased and the liquid life of the degreasing tank is shortened. In addition, a flaw detection agent using a solvent that can be easily washed away with water before the degreasing process has been developed. However, the plastic working oil remaining on the surface of the automobile body steel plate causes repellency and uniformly applies to the steel plate surface. You have the problem that you can't. In addition, fluorescent dyes and oil-soluble dyes are used as flaw detection agents, and there is a problem in that wastewater treatment is burdened.

例えば、溶剤タイプの探傷剤としては、アルコールおよび/またはアルコール誘導体と油溶性染料および/または蛍光染料から成り、界面活性剤を含有しないもの(特許文献1)、多価アルコール、合成糊料の群より選ばれたものと界面活性剤とを含有したもの(特許文献2)が挙げられる。これらは、上記に示したような欠点を持っている。
特開昭50−159390号 特開昭53−126980号
For example, the solvent type flaw detection agents include alcohol and / or alcohol derivatives and oil-soluble dyes and / or fluorescent dyes, which do not contain a surfactant (Patent Document 1), polyhydric alcohols, and synthetic glues. The thing (patent document 2) containing what was chosen more and surfactant was mentioned. These have the disadvantages shown above.
JP-A-50-159390 JP 53-126980 A

従って、本発明の目的はプレス加工後の自動車ボディ鋼板の塗装工程において、塗装前の自動車ボディ鋼板に塗布し、照射することにより鋼板表面に光沢のムラやその差を観察することにより微小な凹凸を目視で簡単に検査することができ、蛍光染料等を含有せず、且つ、水洗で鋼板表面に残存していたプレス加工油等とともに除去することができ、後工程の脱脂洗浄液への負荷を軽減することができる板金傷探傷剤及び探傷検査方法を提供することにある。   Therefore, the object of the present invention is to apply a fine unevenness on the surface of the steel plate by observing the unevenness of the surface of the steel plate and its difference by applying and irradiating the car body steel plate before coating in the coating process of the car body steel plate after press working. Can be easily inspected visually, can be removed together with the press working oil that does not contain fluorescent dyes, etc. and remains on the surface of the steel plate by washing with water, and the load on the degreasing cleaning liquid in the subsequent process is reduced. An object of the present invention is to provide a sheet metal flaw detection agent and a flaw detection inspection method that can be reduced.

本発明者は、上記目的を達成すべく鋭意研究を重ねた結果、特定の探傷剤及びこれを用いた板金表面凹凸欠陥傷の探傷検査方法を用いることで上記目的を達成できることを見出し、本発明を完成するに至った。   As a result of intensive studies to achieve the above object, the present inventor has found that the above object can be achieved by using a specific flaw detection agent and a flaw detection inspection method for sheet metal surface unevenness flaws using the same. It came to complete.

即ち、本発明は、板金探傷剤及びこれを用いた探傷検査方法に関する。
1.下記一般式(1)で表されるグリコール系溶剤を1種又は2種以上含有することを特徴とする板金傷探傷剤を提供する。
O(CO)m(CO)nR (1)
[式中、RおよびRは、水素又は炭素数1〜8の飽和または不飽和炭化水素基を表す(但し、同時に水素ではない)。mおよびnは0〜3の整数(但し、mとnの和は1以上)を示す。]
2.更に、フッ素系界面活性剤を含む上記項1に記載の板金傷探傷剤。
3.グリコール系溶剤を80〜99.999重量%、フッ素系界面活性剤を0.001〜2重量%含有する上記項1ないし2に記載の板金傷探傷剤。
4.水に対する溶解度(25℃)が3重量%以上である該グリコール系溶剤を10重量%以上含有する上記項3に記載の板金傷探傷剤。
5.上記項1ないし4の板金傷探傷剤を板金の表面に塗布し、光照射により目視で欠陥(微小な凹凸)を確認し、次いで、水洗することを特徴とする板金傷の探傷検査方法。
Specifically, the present invention relates to a sheet metal flaw detection agent and a flaw detection inspection method using the same.
1. There is provided a sheet metal flaw detection agent characterized by containing one or more glycol solvents represented by the following general formula (1).
R 1 O (C 2 H 4 O) m (C 3 H 6 O) nR 2 (1)
[Wherein, R 1 and R 2 represent hydrogen or a saturated or unsaturated hydrocarbon group having 1 to 8 carbon atoms (but not simultaneously hydrogen). m and n represent an integer of 0 to 3 (however, the sum of m and n is 1 or more). ]
2. The sheet metal flaw detection agent according to Item 1, further comprising a fluorine-based surfactant.
3. Item 3. The sheet metal flaw detection agent according to Item 1 or 2, comprising 80 to 99.999% by weight of a glycol solvent and 0.001 to 2% by weight of a fluorosurfactant.
4). Item 4. The sheet metal flaw detection agent according to Item 3, comprising 10% by weight or more of the glycol solvent having a solubility in water (25 ° C.) of 3% by weight or more.
5. A sheet metal flaw detection inspection method comprising applying the sheet metal flaw detection agent according to any one of the above items 1 to 4 to the surface of the sheet metal, visually checking for defects (fine irregularities) by light irradiation, and then washing with water.

本発明の板金傷探傷剤は、塗装前の自動車ボディ鋼板に塗布することで鋼板表面に光沢をもたせて反射によって微小な凹凸を目視で確認できるようにする。また、本板金傷探傷剤は、プレス油等をも溶解すると共に水で簡単に洗い流せるため、次工程の脱脂槽に混入する油の量を減らすこともでき、脱脂液の液寿命を延ばすこともできる。また、蛍光染料等を含有せず廃水処理への負担を軽減できる。   The sheet metal flaw detection agent of the present invention is applied to an automobile body steel plate before coating so that the surface of the steel plate has a gloss so that minute irregularities can be visually confirmed by reflection. In addition, this sheet metal flaw detection agent dissolves press oil etc. and can be easily washed away with water, so the amount of oil mixed in the degreasing tank in the next process can be reduced and the liquid life of the degreasing liquid can be extended. it can. In addition, the burden on wastewater treatment can be reduced without containing a fluorescent dye or the like.

本発明の板金傷探傷剤は、水と油のどちらに対しても適度な親和性(溶解性)を持つ下記一般式(1)で表されるグリコール系溶剤を主成分としているため、プレス油等が付着した塗装直前の鋼板表面に均一に塗布することができ、かつ水だけで簡単に洗い流すことができ、また、プレス油等をも同時に溶解除去できる。   Since the sheet metal flaw detection agent of the present invention is mainly composed of a glycol solvent represented by the following general formula (1) having an appropriate affinity (solubility) for both water and oil, press oil Etc. can be uniformly applied to the surface of the steel plate immediately before coating, can be easily washed away with water alone, and press oil can be dissolved and removed at the same time.

O(CO)m(CO)nR (1)
式中、RおよびRは、水素又は炭素数1〜8の飽和または不飽和炭化水素基を表す。但し、同時に水素ではない。mおよびnは0〜3の整数を示す。但し、mとnの和は1以上である。
R 1 O (C 2 H 4 O) m (C 3 H 6 O) nR 2 (1)
In the formula, R 1 and R 2 represent hydrogen or a saturated or unsaturated hydrocarbon group having 1 to 8 carbon atoms. However, it is not hydrogen at the same time. m and n represent an integer of 0 to 3. However, the sum of m and n is 1 or more.

本発明の板金傷探傷剤に用いられるグリコール系溶剤としては、エチレングリコール、ジエチレングリコール、トリエチレングリコールのモノアルキル又はジアルキルエーテル等のエチレングリコール誘導体やプロピレングリコール、ジプロピレングリコール、トリプロピレングリコールのモノアルキル又はジアルキルエーテル等のプロピレングリコール誘導体等が挙げられるが、これらに限定されない。   Examples of the glycol solvent used in the sheet metal flaw detection agent of the present invention include ethylene glycol derivatives such as ethylene glycol, diethylene glycol, monoalkyl of triethylene glycol or dialkyl ether, propylene glycol, dipropylene glycol, monoalkyl of tripropylene glycol or Although propylene glycol derivatives, such as dialkyl ether, are mentioned, it is not limited to these.

より具体的に例示すると次に示すものが挙げられる。エチレングリコールモノメチルエーテル、エチレングリコールモノエチルエーテル、エチレングリコールモノプロピルエーテル、エチレングリコールモノブチルエーテル、エチレングリコールジメチルエーテル、エチレングリコールモノベンジルエーテル、エチレングリコールモノ−2−エチルヘキシルエーテル、エチレングリコールジブチルエーテル、ジエチレングリコールモノメチルエーテル、ジエチレングリコールモノエチルエーテル、ジエチレングリコールモノブチルエーテル、ジエチレングリコールモノ−2−エチルヘキシルエーテル、ジエチレングリコールジメチルエーテル、ジエチレングリコールジエチルエーテル、トリエチレングリコールモノメチルエーテル、トリエチレングリコールモノエチルエーテル、トリエチレングリコールモノブチルエーテル、トリエチレングリコールジメチルエーテル、トリエチレングリコールジエチルエーテル、トリエチレングリコールジブチルエーテル、トリエチレングリコールモノ−2−エチルヘキシルエーテル、プロピレングリコールモノメチルエーテル、プロピレングリコールモノエチルエーテル、プロピレングリコールモノプロピルエーテル、プロピレングリコールモノブチルエーテル、プロピレングリコールジメチルエーテル、プロピレングリコールモノベンジルエーテル、プロピレングリコールモノ−2−エチルヘキシルエーテル、プロピレングリコールジブチルエーテル、ジプロピレングリコールモノメチルエーテル、ジプロピレングリコールモノエチルエーテル、ジプロピレングリコールモノプロピルエーテル、ジプロピレングリコールモノブチルエーテル、ジプロピレングリコールモノ−2−エチルヘキシルエーテル、ジプロピレングリコールジメチルエーテル、ジプロピレングリコールジエチルエーテル、トリプロピレングリコールモノメチルエーテル、トリプロピレングリコールモノエチルエーテル、トリプロピレングリコールモノブチルエーテル、トリプロピレングリコールジメチルエーテル、トリプロピレングリコールジエチルエーテル、トリプロピレングリコールジブチルエーテル、トリプロピレングリコールモノ−2−エチルヘキシルエーテル等が挙げられるが、それら限定されない。該グリコール系溶剤は単独で用いても混合して使用してもかまわない。   More specific examples include the following. Ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, ethylene glycol monopropyl ether, ethylene glycol monobutyl ether, ethylene glycol dimethyl ether, ethylene glycol monobenzyl ether, ethylene glycol mono-2-ethylhexyl ether, ethylene glycol dibutyl ether, diethylene glycol monomethyl ether, Diethylene glycol monoethyl ether, diethylene glycol monobutyl ether, diethylene glycol mono-2-ethylhexyl ether, diethylene glycol dimethyl ether, diethylene glycol diethyl ether, triethylene glycol monomethyl ether, triethylene glycol monoethyl ether, triethylene glycol Cole monobutyl ether, triethylene glycol dimethyl ether, triethylene glycol diethyl ether, triethylene glycol dibutyl ether, triethylene glycol mono-2-ethylhexyl ether, propylene glycol monomethyl ether, propylene glycol monoethyl ether, propylene glycol monopropyl ether, propylene glycol Monobutyl ether, propylene glycol dimethyl ether, propylene glycol monobenzyl ether, propylene glycol mono-2-ethylhexyl ether, propylene glycol dibutyl ether, dipropylene glycol monomethyl ether, dipropylene glycol monoethyl ether, dipropylene glycol monopropyl ether, Propylene glycol monobutyl ether, dipropylene glycol mono-2-ethylhexyl ether, dipropylene glycol dimethyl ether, dipropylene glycol diethyl ether, tripropylene glycol monomethyl ether, tripropylene glycol monoethyl ether, tripropylene glycol monobutyl ether, tripropylene glycol dimethyl ether, Examples include tripropylene glycol diethyl ether, tripropylene glycol dibutyl ether, and tripropylene glycol mono-2-ethylhexyl ether, but are not limited thereto. These glycol solvents may be used alone or in combination.

本発明の板金傷探傷剤における該グリコール系溶剤の濃度は、好ましくは、80〜99.999重量%(より好ましくは90〜99.99重量%)である。これは、該グリコール系溶剤の濃度が80重量%以上で、水で簡単に洗い流せ、このときプレス油等を水中に可溶化するため(分離浮上しないため)、油の金属板への再付着がなく、次の工程の脱脂が容易になり、脱脂液の寿命をも延ばすことができるからである。   The concentration of the glycol solvent in the sheet metal flaw detection agent of the present invention is preferably 80 to 99.999% by weight (more preferably 90 to 99.99% by weight). This is because the concentration of the glycol solvent is 80% by weight or more, and it can be easily washed away with water. At this time, press oil or the like is solubilized in water (because it does not float separately). This is because the degreasing in the next step is facilitated and the life of the degreasing solution can be extended.

また、本発明の板金傷探傷剤に用いられる溶剤のうち少なくとも一つの溶剤の水への溶解度(25℃)は3重量%以上で、探傷剤全体に対して10重量%以上含有することが好ましい。水への溶解度(25℃)が3重量%以上では、水で簡単に洗い流せるため、プレス油等の除去性も良好である。例えば、エチレングリコールモノブチルエーテル、プロピレングリコールモノプロピルエーテル、ジプロピレングリコールモノブチルエーテル、エチレングリコールモノプロピルエーテル、プロピレングリコールモノブチルエーテル、ジエチレングリコールモノブチルエーテル、ジプロピレングリコールモノプロピルエーテル、ジエチレングリコールジメチルエーテル、ジエチレングリコールジエチルエーテル、トリエチレングリコールジメチルエーテルが挙げられる。   Further, the solubility (25 ° C.) in water of at least one of the solvents used in the sheet metal flaw detection agent of the present invention is 3% by weight or more, preferably 10% by weight or more based on the whole flaw detection agent. . When the solubility in water (25 ° C.) is 3% by weight or more, it can be easily washed away with water, so that the removability of press oil and the like is good. For example, ethylene glycol monobutyl ether, propylene glycol monopropyl ether, dipropylene glycol monobutyl ether, ethylene glycol monopropyl ether, propylene glycol monobutyl ether, diethylene glycol monobutyl ether, dipropylene glycol monopropyl ether, diethylene glycol dimethyl ether, diethylene glycol diethyl ether, triethylene Glycol dimethyl ether is mentioned.

本発明の板金傷探傷剤に用いるフッ素系界面活性剤の効果は、探傷剤のレベリング性(均一塗布性)を高めることにある。   The effect of the fluorosurfactant used in the sheet metal flaw detection agent of the present invention is to improve the leveling property (uniform coating property) of the flaw detection agent.

本発明の板金傷探傷剤において、フッ素系界面活性剤としては、アニオン系界面活性剤、ノニオン系界面活性剤がある。アニオン系界面活性剤としては、パーフルオロアルキル基やパーフルオロアルケニル基を含むカルボン酸系の界面活性剤、同じくスルホン酸系活性剤、硫酸エステル系界面活性剤及び燐酸エステル系界面活性剤がある。ノニオン系界面活性剤としては、パーフルオロアルキル基やパーフルオロアルケニル基を含むポリエチレン(及び/又はポリプロピレン)オキサイドエーテル系界面活性剤、同じく多価アルコール脂肪酸エステル系界面活性剤、ポリエチレン(及び/又はポリプロピレン)オキサイドエステル系界面活性剤およびアミド系界面活性剤等が挙げられるが、これらに限定されない。   In the sheet metal flaw detection agent of the present invention, examples of the fluorosurfactant include an anionic surfactant and a nonionic surfactant. Examples of the anionic surfactant include carboxylic acid-based surfactants containing a perfluoroalkyl group or a perfluoroalkenyl group, as well as sulfonic acid-based surfactants, sulfate ester-based surfactants, and phosphate ester-based surfactants. Nonionic surfactants include polyethylene (and / or polypropylene) oxide ether surfactants containing perfluoroalkyl groups and perfluoroalkenyl groups, polyhydric alcohol fatty acid ester surfactants, polyethylene (and / or polypropylene). ) Oxide ester surfactants, amide surfactants, and the like, but are not limited thereto.

本発明の板金傷探傷剤におけるフッ素系界面活性剤の濃度は、好ましくは、0.001〜2重量%(より好ましくは0.01〜1重量%)である。これは、該フッ素系界面活性剤の濃度が0.001重量%以上で十分なレベリング性が得られ、また濃度が2重量%を超えると経済的に好ましくないからである。   The concentration of the fluorosurfactant in the sheet metal flaw detector of the present invention is preferably 0.001 to 2% by weight (more preferably 0.01 to 1% by weight). This is because a sufficient leveling property can be obtained when the concentration of the fluorosurfactant is 0.001% by weight or more, and it is economically undesirable if the concentration exceeds 2% by weight.

本発明の板金傷探傷剤には油への親和性を損なわない範囲で水を添加することができる。水の添加によって薬剤の引火点が高くなり、安全性を高めることができる。本発明の板金傷探傷剤に添加する水の量は、グリコール系溶剤の種類により異なるが、好ましくは、板金傷探傷剤全体に対して10重量%未満(より好ましくは5重量%以下)である。水の量が10重量%以上では、油への親和性を維持することが困難になるとともに、鋼板表面に探傷剤を塗布してから数時間ないし数日間放置するような場合に錆の発生原因となることがある。   Water can be added to the sheet metal flaw detection agent of the present invention as long as the affinity for oil is not impaired. The addition of water increases the flash point of the drug and can increase safety. The amount of water added to the sheet metal flaw detection agent of the present invention varies depending on the type of glycol solvent, but is preferably less than 10% by weight (more preferably 5% by weight or less) with respect to the whole sheet metal flaw detection agent. . If the amount of water is 10% by weight or more, it will be difficult to maintain the affinity for oil, and the cause of rust when it is left for several hours to several days after applying the flaw detection agent to the steel sheet surface It may become.

本発明品の板金への塗布方法は特に問わないが、一般的には刷け塗りあるいはスプレー等により塗布する。次いで適当に光を照射することにより、表面の光沢のムラやその差を観察することにより凹凸欠損傷の存在を確認することができる。次いで、水洗、脱脂洗浄、化成皮膜処理をへて塗装される。   The method of applying the product of the present invention to the sheet metal is not particularly limited, but is generally applied by brush coating or spraying. Next, by appropriately irradiating with light, it is possible to confirm the presence or absence of irregularities by observing unevenness of the gloss on the surface and the difference therebetween. Subsequently, it is painted by water washing, degreasing washing, and chemical conversion film treatment.

以下、本発明を実施例および比較例に基づいて更に具体的に説明するが、本発明がそれら実施例に限定されることは意図しない。   EXAMPLES Hereinafter, although this invention is demonstrated more concretely based on an Example and a comparative example, it is not intending that this invention is limited to these Examples.

試験用鋼板の調製
50mm×70mmの冷間圧延鋼板に塑性加工油を薄く塗布して試験用鋼板とした。
Preparation of Test Steel Plate A plastic working oil was thinly applied to a 50 mm × 70 mm cold rolled steel plate to obtain a test steel plate.

実施例1〜10
表1に示した組成で実施例1〜10の探傷剤を調製(単位:重量%)し、該探傷剤を試験用鋼板に刷けを用いて塗布して目視で探傷剤の拡がり具合(濡れ性)を評価した。その後、試験用鋼板を水洗して洗浄水表面に浮上した油滴量を目視で確認した。さらに、水洗した後の試験用鋼板表面に残った油または探傷剤を目視で確認した。評価結果を表1に示した。
Examples 1-10
The flaw detection agents of Examples 1 to 10 having the compositions shown in Table 1 were prepared (unit:% by weight), the flaw detection agent was applied to a test steel plate using a brush, and the spread of the flaw detection agent was visually observed (wetting). Sex). Thereafter, the test steel plate was washed with water and the amount of oil droplets floating on the surface of the washing water was visually confirmed. Furthermore, the oil or flaw detection agent remaining on the surface of the test steel plate after washing with water was visually confirmed. The evaluation results are shown in Table 1.

[評価基準]
1.塗布後表面状態の評価
○:均一になじんでいる
×:はじきが生じている
2.水洗後の洗浄水の評価
○:ほとんど油膜は見えない(可溶化している)
×:多量の油膜が見える
3.水洗後の鋼板表面の評価
○:油も薬剤もほとんど落ちている
×:油あるいは薬剤が残っている
[Evaluation criteria]
1. Evaluation of surface condition after coating ○: Uniformly accustomed ×: Repelling has occurred
2. Evaluation of washing water after washing ○: Oil film is hardly visible (solubilized)
×: A large amount of oil film is visible
3. Evaluation of steel plate surface after washing ○: Oil and chemicals are almost falling ×: Oil or chemicals remain

Figure 0004362618
Figure 0004362618

比較例1〜6
表2に示した組成で比較例1〜6の探傷剤を調製(単位:重量%)し、実施例と同様の試験、評価を行った。結果を表2に示した。
Comparative Examples 1-6
The flaw detection agents of Comparative Examples 1 to 6 were prepared with the compositions shown in Table 2 (unit:% by weight), and the same tests and evaluations as in Examples were performed. The results are shown in Table 2.

Figure 0004362618
Figure 0004362618

以上の結果より各実施例による薬剤はいずれも高い均一塗布性を認めた。さらに水洗後の洗浄水に混入する油の浮上量も少なかった。   From the above results, all of the drugs according to the respective examples showed high uniform applicability. Furthermore, the amount of oil floating in the wash water after washing with water was small.

本発明は、塗装前の板金表面に発生する微小な凹凸欠陥傷を反射によって容易に探すことができる探傷剤及びこれを用いた板金表面凹凸欠陥傷の探傷検査方法に関し、詳しくは、塗装前の自動車の外装材として使用される鋼板表面に発生する微小な凹凸欠陥傷を容易に探すことができる探傷剤及びこれを用いた板金表面凹凸欠陥傷の探傷検査方法に関する。本発明は、塗装前の自動車の外装材として使用される鋼板表面に発生する微小な凹凸欠陥傷を探す工程で利用される。   The present invention relates to a flaw detection agent capable of easily searching for fine uneven defect scratches generated on a sheet metal surface before painting by reflection, and a method for inspecting sheet metal surface uneven defect scratches using the same. The present invention relates to a flaw detection agent capable of easily searching for fine uneven defect scratches generated on the surface of a steel sheet used as an exterior material for automobiles, and a flaw detection inspection method for sheet metal surface uneven defect scratches using the same. INDUSTRIAL APPLICABILITY The present invention is used in a process of searching for minute uneven defect scratches generated on the surface of a steel plate used as an exterior material of an automobile before painting.

Claims (3)

下記一般式(1
O(CO)m(CO)nR(1)
[式中、RおよびRは、水素又は炭素数1〜8の飽和または不飽和炭化水素基を表す(但し、同時に水素ではない)。mおよびnは0〜3の整数(但し、mとnの和は1以上)を示す。]
で表されるグリコール系溶剤を1種又は2種以上、及びフッ素系界面活性剤を含有する板金傷探傷剤であって、該グリコール系溶剤は水に対する溶解度(25℃)が3重量%以上であり、該グリコール系溶剤を10重量%以上含有する板金傷探傷剤。
The following general formula (1 )
R 1 O (C 2 H 4 O) m (C 3 H 6 O) nR 2 (1)
[Wherein, R 1 and R 2 represent hydrogen or a saturated or unsaturated hydrocarbon group having 1 to 8 carbon atoms (but not simultaneously hydrogen). m and n represent an integer of 0 to 3 (however, the sum of m and n is 1 or more). ]
A sheet metal flaw detector containing one or more glycol solvents represented by the formula (1) and a fluorosurfactant, wherein the glycol solvent has a solubility in water (25 ° C.) of 3% by weight or more. A sheet metal flaw detection agent containing 10% by weight or more of the glycol solvent.
グリコール系溶剤を80〜99.999重量%、フッ素系界面活性剤を0.001〜2重量%含有する請求項1に記載の板金傷探傷剤。 The sheet metal flaw detection agent according to claim 1, comprising 80 to 99.999% by weight of a glycol solvent and 0.001 to 2% by weight of a fluorosurfactant. 請求項1又は2の板金傷探傷剤を板金の表面に塗布し、光照射により目視で欠陥(微妙な凹凸)を確認し、次いで、水洗することを特徴とする板金傷の探傷検査方法。 A sheet metal flaw detection inspection method according to claim 1, wherein the flaw detection agent for sheet metal according to claim 1 or 2 is applied to the surface of the sheet metal, defects (subtle irregularities) are visually confirmed by light irradiation, and then washed with water.
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