JP7775122B2 - Concentrated magnetic particle dispersion and magnetic particle liquid for wet magnetic particle testing - Google Patents
Concentrated magnetic particle dispersion and magnetic particle liquid for wet magnetic particle testingInfo
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Description
本発明は、水で希釈して湿式磁粉探傷試験の磁粉液として使用する湿式磁粉探傷試験用濃厚磁粉分散液に関する。詳しくは、該濃厚磁粉分散液は、防藻剤を含有するにも関わらず、長期に亘って磁粉が沈降したり、沈殿したりせずに分散状態を維持でき、かつ、該濃厚磁粉分散液を水で希釈するという簡便な方法で、防藻剤を適正量含有する磁粉液を調製でき、調製した磁粉液は微生物の繁殖を抑制できるので、不快臭や藻状の物質の発生を抑制できるとともに、磁粉液を複数回再利用したとしても凝集し難いので高精度の磁粉探傷試験を実施できる磁粉液になる湿式磁粉探傷試験用濃厚磁粉分散液に関する。 The present invention relates to a concentrated magnetic particle dispersion for wet magnetic particle testing that is diluted with water and used as a magnetic particle liquid for wet magnetic particle testing. Specifically, despite containing an anti-algae agent, this concentrated magnetic particle dispersion maintains a dispersed state for a long period of time without the magnetic particles settling or settling. Furthermore, by simply diluting the concentrated magnetic particle dispersion with water, a magnetic particle liquid containing an appropriate amount of anti-algae agent can be prepared. The prepared magnetic particle liquid inhibits the growth of microorganisms, thereby suppressing the occurrence of unpleasant odors and algae-like substances. Furthermore, the magnetic particle liquid is resistant to aggregation even when reused multiple times, making it suitable for conducting high-precision magnetic particle testing.
周知のとおり、磁粉探傷試験方法は、ＪＩＳ－Ｚ－２３２０に規格化されており、この試験方法は、磁化されている検査物、例えば、シャフトなどの鋼製部品、磁性体やビレットなどの鋼材、磁性体等に市販の湿式磁粉探傷試験用磁粉（四三酸化鉄粒子や純鉄粒子などの導磁性粒子に酢酸セルローズ系合成樹脂やビニルブチラール系合成樹脂などの合成樹脂バインダーを用いてルモゲンイエロー５０７９０：商品名：ＢＡＳＦ社製やフエスタＡ：商品名：Ｓｗａｄａ社製などの蛍光顔料を付着させてなる平均粒子径３～７０μｍ：体積基準分布表示－以下、同じ－で真比重２ｇ／ｃｍ３～５ｇ／ｃｍ３の粉末を水等の分散液に分散させて調製した磁粉液を接触させ、検査物の開口欠陥部（検査物の表面又は表面近傍に存在する微細なワレやピンホール）に磁粉液に分散している磁性粉を集合させて欠陥指示模様を形成させ、この欠陥指示模様によって表面の開口欠陥部を探傷する試験方法（以下、この試験方法を「湿式磁粉探傷試験」という）である。 As is well known, the magnetic particle testing method is standardized in JIS-Z-2320, and this test method involves applying commercially available wet magnetic particle testing magnetic powder (conductive particles such as iron oxide particles or pure iron particles, etc., with a synthetic resin binder such as cellulose acetate synthetic resin or vinyl butyral synthetic resin, to which fluorescent pigments such as Lumogen Yellow 50790 (trade name: manufactured by BASF) or Festa A (trade name: manufactured by Swada) are attached, with an average particle diameter of 3 to 70 μm, volume-based distribution indication (hereinafter the same), and a true specific gravity of 2 g/cm 3 to 5 g/cm 3 ) to a magnetized test object, for example, a steel part such as a shaft, a steel material such as a magnetic body or a billet, or a magnetic body. In this test method, a magnetic particle liquid prepared by dispersing the powder of No. 3 in a dispersion liquid such as water is brought into contact with the test object, causing the magnetic powder dispersed in the magnetic particle liquid to gather at open defects (fine cracks or pinholes present on or near the surface of the test object) to form a defect indication pattern, and the open defects on the surface are detected using this defect indication pattern (hereinafter this test method is referred to as ``wet magnetic particle testing'').
鋼製部品や鉄鋼材の製造ラインにおける湿式磁粉探傷試験において、検査体に散布された探傷液は、探傷試験が終了した後、回収して再利用される。 In wet magnetic particle testing on steel part and steel material manufacturing lines, the testing fluid sprayed onto the test object is collected and reused after the testing is completed.
磁粉液は通常１週間～１カ月程度再利用された後に交換されるが、再利用している間に微生物が繁殖して不快臭が発生したり、藻状の物質が発生したりという問題がある。 Magnetic particle liquid is usually reused for about one week to one month and then replaced, but during reuse, microorganisms can grow, causing unpleasant odors and the growth of algae-like substances, which can be problematic.
また、複数回再利用していると、磁粉が凝集するという問題がある。 Furthermore, if the magnetic powder is reused multiple times, there is the problem of it agglomerating.
磁粉が凝集すると探傷試験の精度が低下したり、磁粉液を貯蔵するタンクや配管内に磁粉が付着したり、磁粉液を散布するノズルの詰まりを生じさせたりする。 When magnetic particles aggregate, the accuracy of flaw detection tests decreases, the magnetic particles adhere to the tanks and pipes that store the magnetic particle liquid, and the nozzles that spray the magnetic particle liquid become clogged.
メチルイソチアゾリノン等の防藻剤を磁粉液に添加することにより、微生物の繁殖を抑制したり、磁粉の凝集を抑制したりできるが、防藻剤の添加量が少な過ぎると、微生物の繁殖抑制の効果が低く、また、多過ぎると磁粉が凝集するという問題がある。 Adding an anti-algae agent such as methylisothiazolinone to the magnetic powder liquid can inhibit microbial growth and prevent magnetic powder from agglomerating, but if too little anti-algae agent is added, the effect of inhibiting microbial growth is low, and if too much is added, the magnetic powder will agglomerate, which is a problem.
製造のスピードアップを要求される製造ラインにおいて、適正量の防藻剤を秤量して磁粉液に添加する工程を追加することは困難であるため、水で希釈する前の濃厚磁粉分散液に予め防藻剤を添加し、希釈さえすれば、適正量の防藻剤を含有する磁粉液を調製できることが望まれている。 In production lines where speedy production is required, it is difficult to add a step of weighing out the appropriate amount of anti-algae agent and adding it to the magnetic powder liquid. Therefore, it is desirable to be able to add the anti-algae agent to the concentrated magnetic powder dispersion before diluting it with water, and then simply dilute it to prepare magnetic powder liquid containing the appropriate amount of anti-algae agent.
しかしながら、希釈した時に適正量になるように濃厚磁粉分散液に予め防藻剤を添加すると、数時間から数日で磁粉が沈降したり、沈殿したりするため、長期に亘って保存することが困難であるという問題がある。 However, if an anti-algae agent is added to a concentrated magnetic particle dispersion in advance so that the appropriate amount is obtained when diluted, the magnetic particles will settle or precipitate within a few hours to a few days, making it difficult to store for long periods of time.
そこで、防藻剤を添加した濃厚磁粉分散液であっても、長期に亘って磁粉が沈降したり、沈殿したりせずに保存が可能であって、希釈して調製した磁粉液は、１カ月程度に亘って複数回再利用したとしても、微生物の繁殖を抑制して不快臭や藻状の物質が発生し難く、また、磁粉が凝集せずに探傷試験の精度が低下しない磁粉液になる濃厚磁粉分散液の開発が望まれている。 Therefore, there is a need to develop a concentrated magnetic particle dispersion that can be stored for long periods of time without the magnetic particles settling or settling, even when an anti-algae agent is added, and that inhibits the growth of microorganisms and is less likely to produce unpleasant odors or algae-like substances, even when diluted and reused multiple times over the course of a month or so, and that does not cause the magnetic particles to aggregate, resulting in a magnetic particle dispersion that does not reduce the accuracy of flaw detection testing.
特許文献１には、ＨＬＢ値１０～１２で平均分子量が７５０～９５０のポリオキシアルキレンポリスチリルフェニルエーテル型非イオン系界面活性剤を分散剤とすることで、４０℃で９０日静置しても磁粉が沈降したり、沈殿したりせずに分散している湿式磁粉探傷試験用濃厚磁粉分散液が記載されている。 Patent Document 1 describes a concentrated magnetic particle dispersion for wet magnetic particle testing, in which magnetic particles remain dispersed without settling or sedimentation even after being left standing at 40°C for 90 days, by using a polyoxyalkylene polystyrylphenyl ether-type nonionic surfactant with an HLB value of 10-12 and an average molecular weight of 750-950 as a dispersant.
しかし、特許文献１に記載される濃厚磁粉分散液は、一定のＨＬＢ値の範囲及び平均分子量の範囲で濃厚磁粉分散液中の磁粉の沈降等を抑制しているため、防藻剤を添加すると数日で磁粉が沈降するという問題がある。 However, the concentrated magnetic particle dispersion described in Patent Document 1 inhibits the settling of magnetic particles in the concentrated magnetic particle dispersion within a certain range of HLB values and average molecular weights, which poses the problem that the magnetic particles settle within a few days when an anti-algae agent is added.
特許文献２には、ポリオキシアルキレンポリスチリルフェニルエーテル型非イオン系界面活性剤と陰イオン活性剤とを分散剤とすることで、４０℃で９０日静置しても磁粉が沈降したり、沈殿したりせずに分散している湿式磁粉探傷試験用濃厚磁粉分散液が記載されている。 Patent Document 2 describes a concentrated magnetic particle dispersion for wet magnetic particle testing, which uses a polyoxyalkylene polystyrylphenyl ether-type nonionic surfactant and an anionic surfactant as dispersants, and in which magnetic particles remain dispersed without settling or sedimentation even after being left standing at 40°C for 90 days.
しかしながら、特許文献２に記載の濃厚磁粉分散液もポリオキシアルキレンポリスチリルフェニルエーテル型非イオン系界面活性剤に陰イオン活性剤を一定の割合で混合することで静電反発力が高くなり、沈降や沈殿が抑制されていると考えられることから、防藻剤を添加すれば、数日で濃厚磁粉分散液中の磁粉が沈降したり、沈殿したりするという問題がある。 However, the concentrated magnetic particle dispersion described in Patent Document 2 also has the problem that, because electrostatic repulsion is increased and settling and sedimentation are suppressed by mixing a certain ratio of an anionic surfactant with a polyoxyalkylene polystyryl phenyl ether-type nonionic surfactant, adding an anti-algae agent will cause the magnetic particles in the concentrated magnetic particle dispersion to settle or precipitate within a few days.
特許文献３には、ＨＬＢ１０～１２のアルキルエーテル型非イオン系界面活性剤とアルコールを分散剤とすることで少なくとも２カ月間の静置によっても磁粉が沈降したり、沈殿したりしない濃厚磁粉分散液が記載されている。 Patent Document 3 describes a concentrated magnetic particle dispersion that uses an alkyl ether-type nonionic surfactant with an HLB of 10 to 12 and alcohol as a dispersant, preventing the magnetic particles from settling or settling even after being left to stand for at least two months.
しかしながら、特許文献３記載の濃厚磁粉分散液に防藻剤を添加すると数日で磁粉が沈降・沈殿するという問題がある。 However, when an anti-algae agent is added to the concentrated magnetic particle dispersion liquid described in Patent Document 3, the magnetic particles settle and precipitate within a few days, which is a problem.
本発明者は、前記諸問題点を解決することを技術的課題とし、試行錯誤的な数多くの試作・実験を重ねた結果、磁粉を１０重量％以上かつ２０重量％以下と非イオン系界面活性剤を５重量％以上かつ１５重量％以下と防藻剤を０．１５重量％以上かつ２．５重量％以下と水とを含有する湿式磁粉探傷試験用濃厚磁粉分散液であり、前記防藻剤はイソチアゾリノン系誘導体及び／又はトリアジン系防藻剤であり、前記非イオン系界面活性剤は水酸基価が６９．５以上かつ７３．６以下のポリオキシアルキレンポリスチリルフェニルエーテル型非イオン系界面活性剤である湿式磁粉探傷試験用濃厚磁粉分散液であれば、防藻剤を含有するにも関わらず、、４０℃の高温中で静置しても１カ月以上という長期に亘って磁粉が沈降したり、沈殿したりせず、また、本発明に係る濃厚磁粉分散液を水で希釈して調製した磁粉液は、１カ月程度に亘って複数回再利用したとしても、微生物の繁殖を抑制し、不快臭や藻状の物質が発生し難く、また、磁粉が凝集し難いので高精度の探傷試験を実施することができると共に、磁粉液を貯蔵するタンクや磁粉液を輸送する配管内に磁粉が付着し難く、磁粉液を散布するノズルの目詰まりも起こり難い磁粉液になるという刮目すべき知見を得て、前記技術的課題を達成したものである。 The inventors set solving the above-mentioned problems as a technical task, and after much trial and error, conducted numerous prototypes and experiments, they discovered a concentrated magnetic particle dispersion for wet magnetic particle testing that contains 10% by weight or more and 20% by weight or less of magnetic particles, 5% by weight or more and 15% by weight or less of a nonionic surfactant, 0.15% by weight or more and 2.5% by weight or less of an anti-algae agent, and water, wherein the anti-algae agent is an isothiazolinone derivative and/or a triazine anti-algae agent, and the nonionic surfactant is a polyoxyalkylene polystyrylphenyl ether-type nonionic surfactant with a hydroxyl value of 69.5 or more and 73.6 or less. If this is done, despite the presence of an anti-algae agent, the magnetic particles will not settle or precipitate for long periods of time, such as over a month, even when left standing at a high temperature of 40°C. Furthermore, the magnetic particle liquid prepared by diluting the concentrated magnetic particle dispersion of the present invention with water inhibits the growth of microorganisms and is less likely to produce unpleasant odors or algae-like substances, even when reused multiple times over a period of about a month. Furthermore, because the magnetic particles are less likely to agglomerate, high-precision flaw detection testing can be carried out. In addition, the magnetic particles are less likely to adhere to the tanks that store the magnetic particle liquid or the piping that transports it, and the magnetic particle liquid is less likely to clog the nozzles that spray the magnetic particle liquid. This remarkable discovery has enabled the achievement of the above technical objectives.
前記技術的課題は、次のとおり本発明によって解決できる。 The above technical problems can be solved by the present invention as follows:
本発明は、磁粉を１０重量％以上かつ２０重量％以下と非イオン系界面活性剤を５重量％以上かつ１５重量％以下と防藻剤を０．１５重量％以上かつ２．５重量％以下と水とを含有する湿式磁粉探傷試験用濃厚磁粉分散液であり、前記防藻剤はイソチアゾリノン系誘導体及び／又はトリアジン系防藻剤であり、前記非イオン系界面活性剤は水酸基価が６９．５以上かつ７３．６以下のポリオキシアルキレンポリスチリルフェニルエーテル型非イオン系界面活性剤である湿式磁粉探傷試験用濃厚磁粉分散液である。 The present invention relates to a concentrated magnetic particle dispersion for wet magnetic particle testing, which contains 10% by weight or more and 20% by weight or less of magnetic particles, 5% by weight or more and 15% by weight or less of a nonionic surfactant, 0.15% by weight or more and 2.5% by weight or less of an anti-algae agent, and water, wherein the anti-algae agent is an isothiazolinone derivative and/or a triazine anti-algae agent, and the nonionic surfactant is a polyoxyalkylene polystyrylphenyl ether-type nonionic surfactant having a hydroxyl value of 69.5 or more and 73.6 or less.
また本発明は、前記イソチアゾリノン系誘導体が、メチルイソチアゾリノン、クロロメチルイソチアゾリノン、オクチルイソチアゾリノン、ジクロロオクチルイソチアゾリノン、ベンズイソチアゾリノンから選択される１又は２以上の混合物である前記の湿式磁粉探傷試験用濃厚磁粉分散液である。 The present invention also relates to the concentrated magnetic particle dispersion for wet magnetic particle testing, wherein the isothiazolinone derivative is one or a mixture of two or more selected from methylisothiazolinone, chloromethylisothiazolinone, octylisothiazolinone, dichlorooctylisothiazolinone, and benzisothiazolinone.
また本発明は、前記トリアジン系防藻剤が、ヘキサヒドロ－１，３，５トリス（２－ヒドロキシエチル）１，３，５トリアジンである前記の湿式磁粉探傷試験用濃厚磁粉分散液である。 The present invention also relates to the concentrated magnetic particle dispersion for wet magnetic particle testing, in which the triazine-based anti-algae agent is hexahydro-1,3,5 tris(2-hydroxyethyl) 1,3,5 triazine.
また本発明は、前記ポリオキシアルキレンポリスチリルフェニルエーテル型非イオン系界面活性剤がポリオキシエチレンポリスチリルフェニルエーテル、ポリオキシエチレンポリオキシプロピレンポリスチリルフェニルエーテルから選択される１又は２以上の混合物である前記の湿式磁粉探傷試験用濃厚磁粉分散液である。 The present invention also relates to the concentrated magnetic particle dispersion for wet magnetic particle testing, wherein the polyoxyalkylene polystyrylphenyl ether-type nonionic surfactant is one or a mixture of two or more surfactants selected from polyoxyethylene polystyrylphenyl ether and polyoxyethylene polyoxypropylene polystyrylphenyl ether.
また本発明は、前記ポリオキシアルキレンポリスチリルフェニルエーテル型非イオン系界面活性剤の平均分子量が７５０以上かつ９５０以下である前記の湿式磁粉探傷試験用濃厚磁粉分散剤である。 The present invention also relates to the concentrated magnetic particle dispersant for wet magnetic particle testing, wherein the polyoxyalkylene polystyrylphenyl ether-type nonionic surfactant has an average molecular weight of 750 or more and 950 or less.
また本発明は、前記非イオン系界面活性剤が、平均分子量７５０以上かつ９５０以下のポリオキシアルキレンポリスチリルフェニルエーテル型非イオン系界面活性剤と、水酸基価が５５以上かつ８５以下で、平均分子量が７５０以上かつ９５０以下のポリオキシアルキレンポリスチリルフェニルエーテル型非イオン系界面活性剤を１又は２以上混合してなる平均分子量７５０以上かつ９５０以下で、水酸基価が６９．５以上かつ７３．６以下のポリオキシアルキレンポリスチリルフェニルエーテル型非イオン系界面活性剤である前記の湿式磁粉探傷試験用濃厚磁粉分散液である。 The present invention also relates to the concentrated magnetic particle dispersion for wet magnetic particle testing, wherein the nonionic surfactant is a polyoxyalkylene polystyrylphenyl ether-type nonionic surfactant having an average molecular weight of 750 to 950 and a hydroxyl value of 69.5 to 73.6, which is a mixture of one or more polyoxyalkylene polystyrylphenyl ether-type nonionic surfactants having an average molecular weight of 750 to 950 and one or more polyoxyalkylene polystyrylphenyl ether-type nonionic surfactants having a hydroxyl value of 55 to 85 and an average molecular weight of 750 to 950.
また本発明は、前記の濃厚磁粉分散液を水で希釈してなる湿式磁粉探傷試験用磁粉液である。 The present invention also relates to a magnetic particle liquid for wet magnetic particle testing, which is obtained by diluting the above-mentioned concentrated magnetic particle dispersion with water.
本発明は、分散剤として、水酸基価が６９．５以上かつ７３．６以下のポリオキシアルキレンポリスチリルフェニルエーテル型非イオン系界面活性剤を使用しているので、イソチアゾリノン系誘導体及び／又はトリアジン系防藻剤を含有するにも関わらず、４０℃の高温で１カ月以上静置しても、磁粉が沈降したり、沈殿したりせず分散状態を維持できる濃厚磁粉分散液である。 The present invention uses a polyoxyalkylene polystyrylphenyl ether-type nonionic surfactant with a hydroxyl value of 69.5 or more and 73.6 or less as a dispersant. Therefore, despite containing an isothiazolinone derivative and/or a triazine-based algae-preventing agent, the concentrated magnetic particle dispersion maintains its dispersed state without settling or precipitating even when left standing at a high temperature of 40°C for more than one month.
また、水酸基価が６９．５以上かつ７３．６以下で、平均分子量が７５０以上かつ９５０以下のポリオキシアルキレンポリスチリルフェニルエーテル型非イオン系界面活性剤であればさらに磁粉が沈降・沈殿し難い濃厚磁粉分散液になる。 Furthermore, if the surfactant used is a polyoxyalkylene polystyrylphenyl ether type nonionic surfactant with a hydroxyl value of 69.5 or more and 73.6 or less, and an average molecular weight of 750 or more and 950 or less, the magnetic particles will be even less likely to settle or precipitate, resulting in a concentrated magnetic particle dispersion.
また、本発明における濃厚磁粉分散液はイソチアゾリノン系誘導体及び／又はトリアジン系防藻剤を含有するので、湿式磁粉探傷試験の現場で適正量になるように防藻剤を磁粉液に防藻剤を秤量して添加しなくても、水で希釈するという簡便な方法で、防藻剤を適正量含有する磁粉液を調製することができる。 Furthermore, because the concentrated magnetic particle dispersion of the present invention contains an isothiazolinone derivative and/or a triazine-based anti-algae agent, it is possible to prepare a magnetic particle dispersion containing the appropriate amount of anti-algae agent by the simple method of diluting it with water, without having to weigh out and add the appropriate amount of anti-algae agent to the magnetic particle dispersion at the site of the wet magnetic particle testing.
また、調製した磁粉液は、１カ月以上に亘って複数回再利用したとしても、微生物の繁殖を抑制することができるため、不快臭や藻状の物質の発生を抑制することができる磁粉液である。 Furthermore, the prepared magnetic powder liquid can inhibit the growth of microorganisms even if it is reused multiple times over a period of more than one month, and is therefore a magnetic powder liquid that can suppress the occurrence of unpleasant odors and algae-like substances.
また、本発明における磁粉液はイソチアゾリノン系誘導体及び／又はトリアジン系防藻剤を含有するので、磁粉の凝集を抑制することができるから、１カ月以上に亘って複数回再利用したとしても、高精度の湿式磁粉探傷試験を実施できる磁粉液である。 In addition, the magnetic particle liquid of the present invention contains an isothiazolinone derivative and/or a triazine anti-algae agent, which can suppress the aggregation of magnetic particles. Therefore, even if the magnetic particle liquid is reused multiple times over a period of one month or more, it can be used to perform high-precision wet magnetic particle testing.
また、磁粉が凝集し難いから、磁粉液を貯蔵するタンクや輸送する配管等に磁粉が付着し難く、検査体に散布するノズルも目詰まりし難いので、作業効率に優れる磁粉液である。 In addition, because the magnetic particles are less likely to agglomerate, they are less likely to adhere to the tanks that store the magnetic particle liquid or the piping that transports it, and the nozzles that spray it onto the test object are less likely to clog, making this a magnetic particle liquid with excellent work efficiency.
本発明における濃厚磁粉分散液は磁粉と分散剤として非イオン系界面活性剤と防藻剤と水を含有する。 The concentrated magnetic particle dispersion of the present invention contains magnetic particles, a nonionic surfactant as a dispersant, an anti-algae agent, and water.
（磁粉）
本発明における磁粉は、導磁性粒子粉末（四三酸化鉄粒子粉末や純鉄粒子粉末など）の粒子表面が合成樹脂（酢酸セルローズ系合成樹脂やビニルブチラール系合成樹脂）バインダーと蛍光顔料（ルモゲンイエロー５０７９０（ＢＡＳＦ社製）やフエスタＡ（Ｓｗａｄａ社製））とによって被覆されている蛍光磁粉が好ましい。
(Magnetic powder)
The magnetic powder in the present invention is preferably fluorescent magnetic powder in which the particle surfaces of magnetically conductive particles (such as iron tetroxide particles or pure iron particles) are coated with a synthetic resin (cellulose acetate synthetic resin or vinyl butyral synthetic resin) binder and a fluorescent pigment (Lumogen Yellow 50790 (manufactured by BASF) or Festa A (manufactured by Swada)).
導磁性粒子はメジアン径３μｍ～７０μｍで真比重２g／ｃｍ３～５g／ｃｍ３のものが好適である。 The magnetically conductive particles preferably have a median diameter of 3 μm to 70 μm and a true specific gravity of 2 g/cm 3 to 5 g/cm 3 .
蛍光磁粉は市販品を用いればよい。
市販品として、湿式磁粉探傷試験用磁粉スーパーマグナＬＹ－１０、同スーパーマグナＬＹ－２０、同スーパーマグナＬＹ－２０Ｐ（いずれもマークテック株式会社製）を例示する。
The fluorescent magnetic powder may be a commercially available product.
Examples of commercially available products include magnetic particles for wet magnetic particle testing, Super Magna LY-10, Super Magna LY-20, and Super Magna LY-20P (all manufactured by Marktec Co., Ltd.).
濃厚磁粉分散液における磁粉の含有量は１０重量％～２０重量％である。 The magnetic powder content in the concentrated magnetic powder dispersion is 10% to 20% by weight.
１０重量％未満であると、磁粉液の調製時に多量の磁粉分散液が必要になるため作業効率が悪く、２０重量％を超えると分散安定性が悪くなり、長期に亘って静置すると磁粉が沈降したり、沈殿したりする虞があるからである。 If it is less than 10% by weight, a large amount of magnetic powder dispersion liquid is required when preparing the magnetic powder liquid, resulting in poor work efficiency. If it exceeds 20% by weight, the dispersion stability will deteriorate, and there is a risk that the magnetic powder will settle or precipitate if left undisturbed for a long period of time.
（非イオン系界面活性剤）
本発明は分散剤として、ポリオキシアルキレンポリスチリルフェニルエーテル型非イオン系界面活性剤（以下「非イオン系界面活性剤」と言うことがある）を含有する。
(Nonionic surfactant)
The present invention contains a polyoxyalkylene polystyrylphenyl ether type nonionic surfactant (hereinafter sometimes referred to as "nonionic surfactant") as a dispersant.
非イオン系界面活性剤として、ポリオキシエチレンポリスチリルフェニルエーテル、ポリオキシエチレンポリオキシプロピレンポリスチリルフェニルエーテルを例示するがこれらに限定されるものではない。 Examples of nonionic surfactants include, but are not limited to, polyoxyethylene polystyrylphenyl ether and polyoxyethylene polyoxypropylene polystyrylphenyl ether.
非イオン系界面活性剤は、単独で使用しても良いし２種以上混合して使用してもよい。 Nonionic surfactants may be used alone or in combination of two or more types.
非イオン系界面活性剤の水酸基価は６９．５～７３．６であることが好ましく、さらに好ましくは、７２．０～７３．５である。 The hydroxyl value of the nonionic surfactant is preferably 69.5 to 73.6, and more preferably 72.0 to 73.5.
水酸基価が６９．５未満、又は、７３．６より高くなると、イソチアゾリノン系誘導体及び／又はトリアジン系防藻剤を添加した際に長期に亘って分散状態を維持できずに、磁粉が沈降したり、沈殿したりするからである。 If the hydroxyl value is less than 69.5 or more than 73.6, the magnetic particles will not be able to maintain a dispersed state for a long period of time when an isothiazolinone derivative and/or triazine anti-algae agent is added, and will settle or precipitate.
非イオン系界面活性剤の平均分子量は７５０～９５０であること好ましい。 The average molecular weight of the nonionic surfactant is preferably 750 to 950.
平均分子量が７５０未満であると、粘度が低くなり過ぎるため濃厚磁粉分散液中で磁粉を分散して保持する粘度にならずに沈降したり、沈殿したりする虞があり、９５０を超えると、粘度が高くなりすぎて磁粉液を調製する際の秤量作業の効率が悪くなるからである。 If the average molecular weight is less than 750, the viscosity will be too low, and the viscosity will not be sufficient to disperse and retain the magnetic powder in the concentrated magnetic powder dispersion, which could result in sedimentation or settling. If the average molecular weight exceeds 950, the viscosity will be too high, which will reduce the efficiency of the weighing process when preparing the magnetic powder liquid.
本発明においては、水酸基価が６９．５～７３．６で、平均分子量が７５０～９５０の単独の非イオン系界面活性剤であってもよいし、非イオン系界面活性剤を混合して水酸基価が６９．５～７３．６で、平均分子量が７５０～９５０に調製した非イオン系界面活性剤であってもよい。 In the present invention, the surfactant may be a single nonionic surfactant with a hydroxyl value of 69.5 to 73.6 and an average molecular weight of 750 to 950, or a nonionic surfactant prepared by mixing nonionic surfactants to have a hydroxyl value of 69.5 to 73.6 and an average molecular weight of 750 to 950.
（防藻剤）
本発明における濃厚磁粉分散液は防藻剤としてイソチアゾリノン系誘導体及び／又はトリアジン系防藻剤を含有する。
(anti-algae agent)
The concentrated magnetic particle dispersion of the present invention contains an isothiazolinone derivative and/or a triazine anti-algae agent as an anti-algae agent.
イソチアゾリノン系誘導体として、メチルイソチアゾリノン、クロロメチルイソチアゾリノン、オクチルイソチアゾリノン、ジクロロオクチルイソチアゾリノン、ベンズイソチアゾリノンを例示するがこれらに限定されない。 Examples of isothiazolinone derivatives include, but are not limited to, methylisothiazolinone, chloromethylisothiazolinone, octylisothiazolinone, dichlorooctylisothiazolinone, and benzisothiazolinone.
トリアジン系防藻剤として、ヘキサヒドロ－１，３，５トリス（２－ヒドロキシエチル）１，３，５トリアジンを例示するが、これに限定されるものではない。 An example of a triazine-based algae control agent is hexahydro-1,3,5 tris(2-hydroxyethyl) 1,3,5 triazine, but it is not limited to this.
本発明においては、イソチアゾリノン系誘導体を単独で使用してもよく、また、２種以上を混合して使用してもよい。 In the present invention, the isothiazolinone derivatives may be used alone or in combination of two or more.
また、トリアジン系防藻剤を単独で使用してもよいし、２種以上を混合して使用してもよい。 Triazine-based algae inhibitors may be used alone or in combination of two or more types.
また、イソチアゾリノン系誘導体とトリアジン系防藻剤を混合して使用してもよい。 It is also possible to use a mixture of isothiazolinone derivatives and triazine anti-algae agents.
本発明における防藻剤の含有量は０．１５重量％～２．５重量％であり、より好ましくは、０．７５重量％～２．５重量％である。 The content of the anti-algae agent in the present invention is 0.15% to 2.5% by weight, and more preferably 0.75% to 2.5% by weight.
防藻剤が０．１５重量％未満であると、調製した磁粉液の微生物の繁殖抑制効果が低すぎて、微生物が繁殖する虞があり、また、２．５重量％よりも多ければ、長期に亘って保存した際に磁粉が沈降したり、沈殿したりする虞があり、また、調製した磁粉液の磁粉が凝集する虞があるからである。 If the anti-algae agent is less than 0.15% by weight, the prepared magnetic powder liquid will have too little effect in inhibiting microbial growth, which could result in microbial growth. If the amount is more than 2.5% by weight, there is a risk that the magnetic particles will settle or precipitate when stored for an extended period of time, and there is also a risk that the magnetic particles in the prepared magnetic powder liquid will aggregate.
本発明における濃厚磁粉分散液の粘度は１０００ｍＰａ・ｓ～５０００ｍＰａ・ｓが好ましく、さらに好ましくは、１０００ｍＰａ・ｓ～３０００ｍＰａ・ｓである。 The viscosity of the concentrated magnetic powder dispersion in the present invention is preferably 1000 mPa·s to 5000 mPa·s, and more preferably 1000 mPa·s to 3000 mPa·s.
製造容器への充填や磁粉液調製の秤量作業に資するからである。 This is because it is useful for filling manufacturing containers and weighing when preparing magnetic powder liquid.
（磁粉液）
本発明における濃厚磁粉分散液は水で希釈することで湿式磁粉探傷試験用磁粉液を調製することができる。
(magnetic powder liquid)
The concentrated magnetic particle dispersion of the present invention can be diluted with water to prepare a magnetic particle liquid for wet magnetic particle testing.
磁粉液は水１Ｌ当たり磁粉０．５ｇ～２．０ｇであることが好ましい。 The magnetic powder liquid preferably contains 0.5g to 2.0g of magnetic powder per 1L of water.
希釈用の水は水道水を使用することができる。 Tap water can be used for dilution.
磁粉液における磁粉の含有量は０．０５重量％～０．２重量％、非イオン系界面活性剤は０．１８重量％～０．７２重量％、防藻剤は０．０７５重量％～０．５重量％であることが好ましい。 The magnetic powder content in the magnetic powder liquid is preferably 0.05% to 0.2% by weight, the nonionic surfactant content is 0.18% to 0.72% by weight, and the anti-algae agent content is 0.075% to 0.5% by weight.
磁粉液には、市販の消泡剤（例えば、消泡剤ＫＳ－５３７、同ＫＳ－５３８、消泡剤ＫＭ－７５（信越化学工業株式会社製））を２重量％～８重量％配合することができる。 The magnetic powder liquid can be blended with 2 to 8% by weight of a commercially available defoamer (e.g., defoamer KS-537, defoamer KS-538, defoamer KM-75 (manufactured by Shin-Etsu Chemical Co., Ltd.)).
また、防錆剤（例えば、亜硝酸ナトリウム）を適宜配合することもできる。 Anti-rust agents (e.g., sodium nitrite) can also be added as appropriate.
前記の各配合成分をそれぞれ前記の各配合割合の範囲内で残部が水となるように秤取し、ステンレス製タンクに、先ず、分散剤、消泡剤、必要に応じて配合する防錆剤及び水を入れ、室温(約２５℃）にて、プロペラ式電動ミキサーを用いて１５分間撹拌した後、撹拌を続けながら、磁粉を加え、さらに６０分間撹拌すれば、磁粉液を得ることができる。 Weigh out each of the above ingredients within the above blending ratios, with the remainder being water. Then, first, place the dispersant, antifoaming agent, and optionally, rust inhibitor, and water into a stainless steel tank. Stir for 15 minutes at room temperature (approximately 25°C) using a propeller-type electric mixer. Then, while continuing to stir, add the magnetic powder and continue stirring for a further 60 minutes to obtain the magnetic powder liquid.
本発明を実施例及び比較例を挙げてより詳しく説明するが、本発明はこれに限られるものではない。 The present invention will be explained in more detail using examples and comparative examples, but the present invention is not limited to these.
水道水、分散剤、防藻剤、消泡剤、防錆剤を表２記載の通りステンレス製タンクに投入し、室温（約２５℃）にて、プロペラ式電動ミキサーを用いて１５分間撹拌した後、撹拌を続けながら湿式磁粉探傷試験用磁粉スーパーマグナＬＹ－１０（マークテック株式会社製）を加え、さらに６０分間撹拌して実施例及び比較例の各濃厚磁粉分散液を作製した。 Tap water, dispersant, algae inhibitor, antifoaming agent, and rust inhibitor were added to a stainless steel tank as shown in Table 2 and stirred at room temperature (approximately 25°C) for 15 minutes using a propeller-type electric mixer. Then, while continuing to stir, Super Magna LY-10 magnetic particles for wet magnetic particle testing (manufactured by Marktec Co., Ltd.) were added and stirred for a further 60 minutes to produce concentrated magnetic particle dispersions for the Examples and Comparative Examples.
各実施例及び比較例の分散剤は表１記載のＡ～Ｍの各非イオン系界面活性剤を使用した。 The dispersants used in each example and comparative example were nonionic surfactants A to M listed in Table 1.
防藻剤として、ファインサイドＣ－１４ＢＴ、ファインサイドＨＳ－２０Ｍ、ファインサイドＬＣ－４３０Ｍ（東京ファインケミカル株式会社社製）、サンライトＩＰ－５０、サンライトＩＰ－５１、サンライトＰ－Ｘ（サンワ化成株式会社社製）、スタテクト１５０（株式会社日新化学研究所社製）、レバナックスＢＡ－２００（昌栄化学株式会社社製）、ｓｏｄｉｕｍ ｏｍａｄｉｎｅ ４０％（ロンザジャパン株式会社社製）
ＢＩＯＳＯＬ－ＬＩＱＵＩＤ（大阪化成株式会社製）を使用した。
Anti-algae agents include Fineside C-14BT, Fineside HS-20M, Fineside LC-430M (manufactured by Tokyo Fine Chemical Co., Ltd.), Sunlight IP-50, Sunlight IP-51, Sunlight P-X (manufactured by Sanwa Kasei Co., Ltd.), Statect 150 (manufactured by Nissin Chemical Research Institute Co., Ltd.), Levanax BA-200 (manufactured by Shoei Chemical Co., Ltd.), and sodium omadine 40% (manufactured by Lonza Japan Co., Ltd.).
BIOSOL-LIQUID (manufactured by Osaka Kasei Co., Ltd.) was used.
消泡剤ＫＳ－５３７（信越化学工業株式会社製）、防錆剤として、亜硝酸ナトリウムを使用した。 Antifoaming agent KS-537 (manufactured by Shin-Etsu Chemical Co., Ltd.) and sodium nitrite were used as rust inhibitors.
各防藻剤の成分は表４に記載した。 The ingredients of each anti-algae agent are listed in Table 4.
（評価）
それぞれ各透明ガラス製ビーカーに２００ｇ入れ、各ビーカーの口を小穴を開けたアルミホイルによって蓋をした状態にて、恒温槽内においてビーカー内の液温を４０℃に保って時間静置した後の分散液の状態を目視にて観察し、上澄み及び沈殿が無い状態を「○」、体積１０％以上の上澄みが発生し、外観上明らかな分離が起こっている状態を「×」と評価した。
(evaluation)
200 g of each was placed in a transparent glass beaker, and the mouth of each beaker was covered with aluminum foil with a small hole punched in it. The beakers were then placed in a thermostatic chamber with the liquid temperature maintained at 40°C, and the state of the dispersion after standing for an hour was visually observed, and a state in which there was no supernatant or precipitate was evaluated as "○", and a state in which 10% or more volume of supernatant had formed and clear separation had occurred in appearance was evaluated as "×".
５℃については冷蔵庫内においてビーカー内の液温を５℃に保った以外は、前記４０℃の場合と同一条件とした For the 5°C test, the same conditions as for the 40°C test were used, except that the liquid temperature in the beaker was kept at 5°C in the refrigerator.
粘度はデジタル回転式粘度計ビスコリード・ワンＬ（ファンギラブ社製）を用いて２０℃・６ｒｐｍの条件にて測定した。 Viscosity was measured using a digital rotational viscometer, Viscorid One L (Fungilab) at 20°C and 6 rpm.
水１Ｌ当たり磁粉が０．５gとなる量の濃厚磁粉分散液を秤量後水に投入し混合攪拌したものを検査液とし、１カ月後の凝集状態を観察した。 A concentrated magnetic particle dispersion was weighed out in an amount that would result in 0.5 g of magnetic particles per liter of water, then poured into water and mixed and stirred to prepare the test solution. The state of aggregation was observed after one month.
凝集が見られなかったもの又は少量の凝集はあるが探傷に影響がないものを〇とし、有効磁粉が少なく凝集が多い又は凝集物のみのものを×として評価した。 Samples where no agglomeration was observed or where there was a small amount of agglomeration but it did not affect flaw detection were rated as 〇, while samples with little effective magnetic powder and a lot of agglomeration or only agglomerates were rated as ×.
結果を表３に示す。 The results are shown in Table 3.
防藻剤を添加する前の実施例６の濃厚磁粉分散液に各防藻剤を０．５重量％になるように添加して、室温で１カ月静置した後、観察して分散性を評価した。 Each anti-algae agent was added to the concentrated magnetic powder dispersion of Example 6 to a concentration of 0.5% by weight before the addition of the anti-algae agent. The mixture was left to stand at room temperature for one month, after which the dispersion was observed and its dispersibility was evaluated.
凝集が見られなかったもの又は少量の凝集はあるが探傷に影響がないものを〇とし、有効磁粉が少なく凝集が多いまたは凝集物のみの物を×として評価した。 Those who saw no agglomeration or who saw a small amount of agglomeration but it did not affect flaw detection were rated as ◯, while those who saw little effective magnetic powder and a lot of agglomeration or only agglomerates were rated as ×.
結果を表４に示す。 The results are shown in Table 4.
表３及び表４に示した通り、本発明における濃厚磁粉分散液であれば、防藻剤を添加したとしても１カ月の長期に亘って磁粉が沈降したり、沈殿したりしない濃厚磁粉探傷液であることが証明された。 As shown in Tables 3 and 4, the concentrated magnetic particle dispersion of the present invention has been proven to be a concentrated magnetic particle inspection solution in which magnetic particles do not settle or precipitate over a long period of time, such as one month, even when an anti-algae agent is added.
本発明における湿式磁粉探傷試験用濃厚磁粉分散剤は、防藻剤を含有するにも関わらず、４０℃のような高温で１カ月以上という長期に亘って保存しても磁粉が沈降したり、沈殿したりすることなく分散状態を維持できる。
また、防藻剤を含有するので、水で希釈するという簡便な方法で防藻剤を適正量含有する磁粉液を調製することができるから、磁粉探傷試験の現場で防藻剤を適正量となるよう秤量して磁粉液に添加する必要がない。
また、調製した磁粉液は防藻剤を適正量含有するので、１カ月以上という長期に亘って複数回再利用したとしても微生物の繁殖を抑制して不快臭や藻状の物質の発生を抑制することができ、しかも、磁粉が凝集し難いので、複数回再利用した磁粉液でも高精度の湿式磁粉探傷試験が実施できる。
また、磁粉が凝集し難いので磁粉液を貯蔵するタンクや配管に磁粉が付着し難く、また、磁粉液を散布するノズルの目詰まりも生じ難い磁粉液を調製できる湿式磁粉探傷試験用濃厚磁粉分散液である。
よって、本発明の産業上の利用可能性は高い。
The concentrated magnetic particle dispersant for wet magnetic particle testing of the present invention contains an anti-algae agent, but can maintain a dispersed state without the magnetic particles settling or settling even when stored at a high temperature such as 40°C for a long period of time such as one month or more.
Furthermore, since it contains an anti-algae agent, a magnetic powder liquid containing the appropriate amount of anti-algae agent can be prepared by the simple method of diluting it with water, so there is no need to weigh out the appropriate amount of anti-algae agent and add it to the magnetic powder liquid at the magnetic particle testing site.
Furthermore, since the prepared magnetic powder liquid contains an appropriate amount of anti-algae agent, even if it is reused multiple times over a long period of time such as one month or more, it is possible to suppress the growth of microorganisms and prevent the occurrence of unpleasant odors and algae-like substances, and furthermore, since the magnetic powder is difficult to agglomerate, high-precision wet magnetic particle inspection testing can be performed even with magnetic powder liquid that has been reused multiple times.
In addition, since the magnetic particles are less likely to agglomerate, the magnetic particles are less likely to adhere to tanks or pipes that store the magnetic particle liquid, and the concentrated magnetic particle dispersion liquid for wet magnetic particle testing can be used to prepare a magnetic particle liquid that is less likely to clog the nozzles that spray the magnetic particle liquid.
Therefore, the present invention has high industrial applicability.
Claims (7)
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| JP2004217451A (en) | 2003-01-10 | 2004-08-05 | Takenaka Komuten Co Ltd | Antifouling agent composition for cement-based building materials, cement-based building material, surface treatment agent for buildings, and antifouling method for buildings |
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