JP3836546B2 - Vaporizable rust preventive composition - Google Patents
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- JP3836546B2 JP3836546B2 JP27026096A JP27026096A JP3836546B2 JP 3836546 B2 JP3836546 B2 JP 3836546B2 JP 27026096 A JP27026096 A JP 27026096A JP 27026096 A JP27026096 A JP 27026096A JP 3836546 B2 JP3836546 B2 JP 3836546B2
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Description
【０００１】
【発明の属する技術分野】
本発明は、鉄鋼材あるいは銅やＡｌなどを始めとする酸化を受け易い非鉄金属などからなる機械・器具や部品等を保管、搬送もしくは輸出する際に、その表面が酸化されて発錆するのを防止するための気化性防錆組成物に関し、特に取扱いが簡便でしかも安定して優れた防錆効果を持続する気化性防錆組成物に関するものである。
【０００２】
【従来の技術】
気化性防錆剤は、被防錆対象物を包装する際に当該包装体の内部空間に気化性防錆剤を挿入しておき、該防錆剤から揮発する防錆成分を被防錆対象物の表面に化学的もしくは物理的に吸着させることによって、大気中の酸素や湿気などによる酸化（腐食）を防止するものであり、特に防錆油等の塗布による防錆を行なえない様な機械・器具、精密機器や電子部品などの保管、搬送、輸出時における防錆管理に広く利用されている。
【０００３】
ところが通常の気化性防錆剤は、常温で揮発して防錆効果を発揮するものであるから、粉末状あるいは液体状の気化性防錆剤を直接被防錆物に散布乃至塗布したのでは、防錆成分が短期間のうちに揮発してしまって防錆効果を喪失する。また粉末状や液状の気化性防錆剤では、それを被防錆物に散布したり塗布するのに手数がかかり、且つそれら防錆成分の担体成分が被防錆物の表面に付着すると、特に精密機器等では機能障害を起こす原因になることがある。更に、機械・器具等には、パーツ毎に異なる種類の金属部材を複数組み込んで１つの機械・器具を構成しているものも多く、その様な機械・器具などでは組合わされた各金属に対して防錆効果を有効に発揮する複数の防錆剤を併用しなければならないこともある。
【０００４】
【発明が解決しようとする課題】
本発明は上記の様な従来技術の問題点に着目してなされたものであって、その目的は、長期間に渡って優れた防錆効果を持続すると共に、その取扱いが簡便で被防錆物を汚染することがなく、しかも異なる種類の金属材が組み込まれた機械・器具等であっても、それらを確実に防錆保護できる様な気化性防錆組成物を提供しようとするものである。
【０００５】
【課題を解決するための手段】
上記課題を解決することのできた本発明の気化性防錆組成物とは、亜硝酸塩と、ほう酸、りん酸およびそれらの塩よりなる群から選択される少なくとも１種のｐＨ緩衝剤と、ベンゾトリアゾールまたはその誘導体と、樹脂粉末とを含有し、粉末状であるところにその特徴が存在する。ここで用いられる好ましい亜硝酸塩としては、亜硝酸ナトリウム、亜硝酸カリウム、亜硝酸カルシウムが、また好ましいベンゾトリアゾールまたはその誘導体としてはベンゾトリアゾールやトリルトリアゾールが例示され、これらはそれぞれ単独で使用し得る他、必要に応じて２種以上を併用することができる。またｐＨ緩衝剤は、単独あるいは２種以上を組合せて用いることができる。
【０００６】
本発明に係る気化性防錆組成物は、上記各成分の均一混合物を粉末状態で不織布等の通気性袋に挿入し、飛散しない様にして実用化することも可能であるが、顆粒状もしくは錠剤状に成形すれば、その取扱いを一層容易にすることができるので好ましい。
【０００７】
【発明の実施の形態】
上記の様に本発明では、防錆成分として亜硝酸塩とｐＨ緩衝剤およびベンゾトリアゾールまたはその誘導体の３成分を併用し、且つそれらを樹脂粉末と共に均一に混合してなるものであり、これを粉末状態のままで通気性袋内に挿入し、あるいは顆粒状や錠剤状に成形してから実用化すれば、液体状の気化性防錆剤に比べてその取扱いが容易であるばかりでなく、被防錆物を汚染する恐れも生じない。しかも、樹脂粉末と共に混合された防錆成分からは防錆ガスが発生するが、この防錆ガスは、樹脂粉末相互間の隙間から少しずつ放散され、優れた防錆効果を長期間持続し得ることとなる。
【０００８】
尚、本発明で防錆成分の１つとして用いられる亜硝酸塩は、それ自体気化性を有していないので、そのままでは気化性防錆剤として有効に作用しないが、雰囲気中の水分および酸成分としての炭酸ガスの存在下で加水分解を起こし、鉄鋼材料に対して優れた防錆効果を発揮するＮＯ2 -ガスを生成し、それにより優れた防錆効果を発揮する。但し空気中の炭酸ガス量は非常に少ないので、亜硝酸塩そのままではＮＯ2 -ガスの生成量および生成速度が小さいため、防錆剤としての即効性に欠ける。ところが、亜硝酸塩と共にｐＨ緩衝剤を適量含有させておくと、上記加水分解の反応速度が促進され、防錆剤としての即効性が高められることが確認された。
【０００９】
この理由は次の様に考えられる。即ち亜硝酸塩は、上記の様に水および酸性成分の共存下で加水分解を起こしてＮＯ2 -ガスを生成するが、空気中の炭酸ガス濃度が低いためそのままでは加水分解が殆んど進行せず、防錆効果の即効性に欠ける。従って、亜硝酸塩に酸性成分を混合してやるとＮＯ2 -ガス生成反応は著しく加速されて即効性は高まるが、酸性物質の酸性度が強過ぎると亜硝酸塩の加水分解が瞬時に起こり、即効性は高められるものの持続性が得られなくなる。ところが酸性領域でｐＨ緩衝作用を発揮する物質を亜硝酸塩と併用すると、緩衝剤の作用によってｐＨの急激な変動が抑えられ、それに伴って亜硝酸塩の加水分解反応の進行も抑えられる結果、ＮＯ2 -ガスは少しづつ放出されることになり、防錆効果の即効性と持続性を合わせ発揮するものと思われる。
【００１０】
しかも顆粒状あるいは錠剤状に成形したものは、該防錆成分が防錆に寄与しない樹脂粉末との混合状態で成形された状態となっており、該樹脂粉末相互の隙間から少しづつ侵入してくる水分によって徐々に加水分解を起こしつつ、同隙間から防錆ガスの放出が行なわれるので、こうしたこととも相まって、従来の液状の気化性防錆剤に比べると、防錆効果の持続性を著しく高めることが可能となる。
【００１１】
ここで、鉄鋼部材に対する防錆ガス発生源となる亜硝酸塩としては、要は水の存在下で加水分解を起こして防錆ガスを生成し得るものであればその種類は制限されないが、防錆効果、取扱い性、経済性等を総合的に考えて特に好ましいのは亜硝酸ナトリウム、亜硝酸カリウム、亜硝酸カルシウム、亜硝酸アンモニウムなどである。
【００１２】
また防錆効果に持続性を持たせる為のｐＨ緩衝剤としては、水の存在系でｐＨ安定化効果を発揮する緩衝剤を全て使用できるが、中でも実用性の高いのは、ほう酸、りん酸、フタル酸、クエン酸、コハク酸、酒石酸、乳酸およびそれらの塩であり、それらは単独で使用する場合もあるし、必要により２種以上を併用してｐＨ安定化効果を一段と高めることも有効である。これらの中でも特に好ましいのは、ほう酸およびりん酸二水素ナトリウムである。
【００１３】
もう１つの防錆成分であるベンゾトリアゾールおよびその誘導体は、それ自身気化性を有しており、これはＡｌなどの非鉄金属に対して優れた防錆効果を発揮する成分であり、中でも特に好ましいのは、ベンゾトリアゾールおよびトリルトリアゾール、とりわけ好ましいのはベンゾトリアゾールである。
【００１４】
次に、上記防錆成分と共に配合される樹脂粉末の種類も特に制限されず、要は上記防錆成分と混合して加圧成形することによって任意の形状に成形し得るものであればどの様な樹脂粉末でもよく、ポリオレフィン系樹脂、塩化ビニル系樹脂、酢酸ビニル系樹脂、ポリアミド系樹脂、ポリエステル系樹脂等を始めとする多くの樹脂粉末、好ましくは合成樹脂粉末を使用することができるが、顆粒状や錠剤状等に成形して実用化する際に特に好ましいのは、加圧成形などによって相互に接合し易く且つ適度の隙間を残しつつ任意の形状を保持することのできる樹脂粉末、特にポリエチレン、ポリプロピレン等のポリオレフィン系樹脂、塩化ビニル系樹脂、酢酸ビニル系樹脂等が好ましく、中でも特に好ましいのはポリエチレン等のポリオレフィン系樹脂粉末である。
【００１５】
該樹脂粉末は、前記防錆成分との均一混合性、成形性、防錆ガスを放出させる為の適度の粒子間隙間形成性などを考慮して、平均粒径で１０〜５００μｍ、より好ましくは５０〜３００μｍ程度のものを使用することが望ましい。
【００１６】
また上記防錆成分や樹脂粉末の好ましい配合比率は、防錆組成物全量中に占める比率で、亜硝酸塩が１〜４０重量％、より好ましくは５〜２０重量％、ｐＨ緩衝剤が０．０１〜１０重量％、より好ましくは０．１〜５重量％、ベンゾトリアゾールまたはその誘導体が１〜４０重量％、より好ましくは５〜２０重量％、樹脂粉末が１０〜９０重量％、より好ましくは５０〜８０重量％の範囲である。
尚本発明の気化性防錆組成物には、上記必須成分の他、必要により着色剤、他の酸化防止剤、脱水剤、分散剤等を適量含有させることも勿論可能である。
【００１７】
かくして得られる本発明の気化性防錆組成物は、上記樹脂粉末相互間の隙間から上記ＮＯ2 -ガスおよびベンゾトリアゾールガスが少しずつ放出されることになり、鉄鋼部材および非鉄金属部材のいずれに対しても、長期間に渡って優れた防錆効果を発揮することとなる。特に顆粒状や錠剤等に成形したものは、粉末状あるいは液状の気化性防錆剤の様に被防錆製品を汚染することがなく、これをそのまま或は適当な通気性袋に収納して被防錆製品の包装乃至梱包袋等の内部に挿入しておくことによって、長期間優れた防錆効果を持続させることが可能となる。尚本発明の防錆組成物を粉末状のままの混合物として実用化する際には、これが飛散しない様に不織布等の通気性袋に挿入しておけば、その取扱い性を一層高めることができるので好ましい。
【００１８】
【実施例】
次に実施例を挙げて本発明をより具体的に説明するが、本発明はもとより下記実施例によって制限を受けるものではなく、前・後記の趣旨に適合し得る範囲で適当に変更を加えて実施することも可能であり、それらは全て本発明の技術的範囲に包含される。
【００１９】
実施例１
亜硝酸ナトリウム１０重量部、ベンゾトリアゾール１０重量部、ほう酸０．３重量部、高密度ポリエチレン（三井石油化学社製「ＨＷ１００Ｐ」、分子量９００）７９．７重量部を、ボールミルを用いて粉砕混合した後、その０．２５ｇを用いて、回転式錠剤機を使用し７００ｋｇに加圧して直径１０ｍｍ、厚み４．２ｍｍの錠剤タイプの気化性防錆剤を得た。
【００２０】
実施例２
上記実施例１における加圧成形前の粉末をそのまま使用し、その０．２５ｇを不織布（帝人社製「ユニセルＢＴ−０７０Ｅ」）からなる３ｃｍ×３ｃｍの袋に挿入してヒートシールし封入した。
【００２１】
比較例１
前記実施例１において、ほう酸の配合を省略し、亜硝酸ナトリウム１０重量部、ベンゾトリアゾール１０重量部、高密度ポリエチレン（三井石油化学社製「ＨＷ１００Ｐ」、分子量９００）８０重量部を用いた以外は、実施例１と全く同様にして粉砕混合および製剤化し、直径１０ｍｍ、厚み４．２ｍｍの錠剤タイプの気化性防錆剤を得た。
【００２２】
比較例２
市販の気化性防錆化合物としてジシクロヘキシルアンモニウムナイトライト（ＤＩＣＨＡＮ）を使用し、その０．２５ｇを、上記実施例２と同様にして不織布に封入した。
【００２３】
比較例３
市販の非金属用気化性防錆化合物としてベンゾトリアゾールを使用し、その０．２５ｇを、上記実施例２と同様にして不織布に封入した。
【００２４】
［防錆試験１］
上記実施例および比較例で得た気化性防錆剤につき、短期気化性防錆試験を行なった。鉄については、ＪＩＳ Ｚ １５１９ ４．４のＨ形の試験法に準拠して防錆能を調べた。また非鉄金属（銅、アルミニウム、アルミニウム鋳物）については、４０×６０×２ｍｍの試験片をゴム栓に吊り下げ、夫々の気化性防錆剤と共に１リットルの広口瓶中に密封し、３０℃で１８時間放置した後、２０℃に冷却して脱イオン水２０ｍｌを広口瓶中に投入し、密封してから５℃×２時間−５０℃×３時間−５℃×１６時間の熱サイクル試験を行ない、発錆状態を目視評価した。結果を表１に示す。
○：全く錆の発生が認められない、×：明らかに錆の発生が認められる。
【００２５】
【表１】
［防錆試験２］
上記実施例および比較例で得た各気化性防錆剤について、長期気化性防錆試験を行なった。鉄、非鉄金属ともに、４０×６０×２ｍｍの試験片をゴム栓に吊り下げ、夫々の気化性防錆剤を水２０ｍｌと共に１リットルの広口瓶中に密封し、３０℃で１月、４月および６月放置した後の発錆状態を目視評価した。結果を表２に示す。
○：全く錆の発生が認められない、×：明らかに錆の発生が認められる。
【００２７】
【表２】
表１，２からも明らかである様に、本発明の要件を満たす実施例１，２の気化性防錆剤は、短期試験はもとより長期試験においても優れた防錆効果を有しているのに対し、比較例１（ｐＨ緩衝剤が配合されていないもの）および比較例３（鉄鋼用防錆剤そのものが配合されていないもの）では、いずれも鉄に対する防錆効果が乏しく、また比較例２（市販の気化性防錆剤）では、鉄および非鉄金属のいずれに対しても、短期気化性防錆試験においては満足な防錆効果が得られていない。
【００２９】
【発明の効果】
本発明は以上の様に構成されており、亜硝酸塩をｐＨ緩衝剤と併用することによって、鉄鋼材に対して防錆ガスの徐放性を与えて長期的に防錆効果を発揮させると共に、これらをベンゾトリアゾールまたはその誘導体と併用することによって非鉄金属材に対しても優れた防錆効果を与え、更にはこれらの防錆成分を樹脂粉末と混合して使用し、殊に顆粒状や錠剤状などに成形し、あるいは粉末状のままであっても不織布等の通気性袋内に充填密封することによって飛散を防止すると共にその取扱い性を高めることができ、気化性防錆剤としての実用性を著しく高め得ることになった。[0001]
BACKGROUND OF THE INVENTION
In the present invention, when storing, transporting or exporting a machine, instrument, or part made of a ferrous material or a non-ferrous metal that is susceptible to oxidation such as copper or Al, the surface is oxidized and rusted. In particular, the present invention relates to a vaporizable rust preventive composition that is easy to handle and that stably maintains an excellent rust preventive effect.
[0002]
[Prior art]
The vaporizable rust preventive is designed to insert the vaporizable rust preventive into the inner space of the package when packaging the object to be rusted, and to remove the rust preventive component volatilized from the rust preventive. It is a machine that prevents oxidation (corrosion) due to oxygen or moisture in the atmosphere by being chemically or physically adsorbed on the surface of the object, and in particular, cannot prevent rust prevention by applying anti-rust oil etc. -It is widely used for rust prevention management at the time of storage, transportation and export of instruments, precision equipment and electronic parts.
[0003]
However, normal vaporizable rust preventives volatilize at room temperature and exhibit a rust preventive effect. Therefore, if powdered or liquid vaporizable rust preventives are sprayed or applied directly to the object to be protected. The rust preventive component volatilizes in a short period of time and loses the rust preventive effect. Also, in the case of a powdery or liquid vaporizable rust preventive agent, it takes time to spread or apply it to the article to be rusted, and when the carrier component of those rust preventive ingredients adheres to the surface of the article to be rusted, Especially in precision instruments, it may cause functional problems. Furthermore, many machines / instruments, etc., are composed of a plurality of different types of metal members for each part to constitute a single machine / equipment. In such machines / instruments, etc. In some cases, it is necessary to use a plurality of rust preventives that effectively exhibit the rust preventive effect.
[0004]
[Problems to be solved by the invention]
The present invention has been made paying attention to the problems of the prior art as described above, and its purpose is to maintain an excellent rust prevention effect over a long period of time and to handle the rust to be rusted easily. It is intended to provide a vaporizable rust preventive composition that can reliably protect rust even if it is a machine / equipment that incorporates different types of metal materials without contaminating the object. is there.
[0005]
[Means for Solving the Problems]
The vaporizable rust preventive composition of the present invention capable of solving the above-mentioned problems includes nitrite , at least one pH buffer selected from the group consisting of boric acid, phosphoric acid and salts thereof, and benzotriazole Or the derivative | guide_body and the resin powder are contained and the characteristic exists in the place which is a powder form . Preferred nitrites used here include sodium nitrite, potassium nitrite and calcium nitrite, and preferred benzotriazoles or derivatives thereof include benzotriazole and tolyltriazole, each of which can be used alone, Two or more kinds can be used in combination as required. Moreover, a pH buffer can be used individually or in combination of 2 or more types.
[0006]
The vaporizable rust preventive composition according to the present invention can be put into practical use in such a manner that the homogeneous mixture of the above components is inserted into a breathable bag such as a nonwoven fabric in a powder state and is not scattered. If it is formed into a tablet, it can be handled more easily, which is preferable.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
As described above, in the present invention, nitrite, a pH buffer, and benzotriazole or a derivative thereof are used in combination as a rust preventive component, and these are uniformly mixed together with a resin powder. If it is inserted into a breathable bag as it is, or formed into granules or tablets and then put into practical use, it is not only easier to handle than liquid vaporizable rust preventives, but also covered. There is no risk of contaminating the rust preventives. Moreover, rust preventive gas is generated from the rust preventive component mixed with the resin powder, but this rust preventive gas is gradually diffused from the gap between the resin powders, and can maintain an excellent rust preventive effect for a long time. It will be.
[0008]
In addition, since nitrite used as one of the rust preventive components in the present invention does not itself have a vaporization property, it does not act effectively as a vaporizable rust preventive agent as it is, but moisture and acid components in the atmosphere. hydrolysis, in the presence of carbon dioxide as, NO 2 exhibits excellent anticorrosive effect against iron and steel materials - generates gas, exerts whereby excellent corrosion protection. Since, however amount of carbon dioxide in the air is very low, as it nitrite NO 2 - for small production amount and production rate of the gas, lacks immediate as corrosion inhibitors. However, it has been confirmed that when an appropriate amount of a pH buffer agent is contained together with nitrite, the reaction rate of the hydrolysis is accelerated and the immediate effect as a rust inhibitor is enhanced.
[0009]
The reason is considered as follows. That nitrite can undergo hydrolysis in the presence of water and acidic components as described above NO 2 - to produce a gas, but as it has a low carbon dioxide concentration in the air causes throat proceed hydrolysis N殆It lacks the immediate effect of the rust prevention effect. Therefore, when'll mixing an acidic component to nitrite NO 2 - gas generating reaction is significantly accelerated immediate is increased, the acidity of the acidic substance is too strong hydrolysis of nitrite occur instantaneously, immediate effect is Although it can be increased, it will not be sustainable. However, when a substance which exhibits a pH buffering action in the acidic range in combination with nitrite, a sudden change in pH is suppressed by the action of the buffer, the results of suppressed progression of the hydrolysis reaction of nitrite with it, NO 2 - gas will be little by little discharged, it is believed to exhibit combined persistence and fast-acting rust effect.
[0010]
Moreover, those molded into granules or tablets are in a state of being molded in a mixed state with the resin powder in which the rust preventive component does not contribute to rust prevention, and gradually enter from the gap between the resin powders. Rust prevention gas is released from the gap while gradually hydrolyzing with the coming water, and combined with this, the sustainability of the rust prevention effect is remarkably higher than that of conventional liquid vaporizable rust prevention agents. It becomes possible to raise.
[0011]
Here, as a nitrite which is a source of rust prevention gas for steel members, the type is not limited as long as it can generate rust prevention gas by hydrolysis in the presence of water, but rust prevention Sodium nitrite, potassium nitrite, calcium nitrite, ammonium nitrite and the like are particularly preferable in view of the effects, handling properties, economic efficiency and the like.
[0012]
In addition, as a pH buffering agent for imparting durability to the rust prevention effect, any buffering agent that exhibits a pH stabilizing effect in the presence of water can be used. Of these, boric acid and phosphoric acid are most practical. , Phthalic acid, citric acid, succinic acid, tartaric acid, lactic acid and their salts, which may be used alone or in combination with two or more if necessary, to further enhance the pH stabilization effect It is. Of these, boric acid and sodium dihydrogen phosphate are particularly preferred.
[0013]
Another rust preventive component, benzotriazole and its derivatives, itself has a vaporizing property, which is a component that exhibits an excellent rust preventive effect against non-ferrous metals such as Al, and is particularly preferable. Are benzotriazole and tolyltriazole, particularly preferred are benzotriazole.
[0014]
Next, the type of resin powder to be blended with the rust preventive component is not particularly limited, and what is important is that it can be molded into an arbitrary shape by mixing with the rust preventive component and pressing. Many resin powders including polyolefin resin, vinyl chloride resin, vinyl acetate resin, polyamide resin, polyester resin, etc., preferably synthetic resin powder can be used. Particularly preferred when it is formed into a granule or tablet and put into practical use, particularly a resin powder that can be easily joined to each other by pressure molding and the like and can retain an arbitrary shape while leaving an appropriate gap, in particular Polyolefin resins such as polyethylene and polypropylene, vinyl chloride resins, vinyl acetate resins and the like are preferable, and polyolefins such as polyethylene are particularly preferable. A resin powder.
[0015]
The resin powder has an average particle size of 10 to 500 μm, more preferably in consideration of uniform mixing with the rust preventive component, moldability, moderate interparticle gap forming property for releasing a rust preventive gas, and the like. It is desirable to use about 50 to 300 μm.
[0016]
Moreover, the preferable mixture ratio of the said rust preventive component and resin powder is the ratio which occupies in the rust preventive composition whole quantity, 1-40 weight% of nitrite, More preferably, 5-20 weight%, pH buffer agent is 0.01. 10 wt%, more preferably 0.1-5 wt%, benzotriazole or its derivative 1-40 wt%, more preferably 5-20 wt%, resin powder 10-90 wt%, more preferably 50 It is in the range of ˜80% by weight.
The vaporizable rust preventive composition of the present invention may of course contain an appropriate amount of a colorant, other antioxidants, a dehydrating agent, a dispersing agent, etc., if necessary, in addition to the above essential components.
[0017]
Thus volatile corrosion composition of the present invention obtained in the above a gap between the resin powder mutual NO 2 - will be gas and benzotriazole gas is released little by little, to any of the steel members and the non-ferrous metal member On the other hand, an excellent antirust effect is exhibited over a long period of time. In particular, those molded into granules or tablets do not contaminate the product to be rusted like a powdery or liquid vaporizable rust inhibitor, and can be stored as it is or in a suitable breathable bag. It is possible to maintain an excellent rust prevention effect for a long period of time by inserting the product into a package or a packaging bag of a product to be protected. When the rust preventive composition of the present invention is put into practical use as a mixture in the form of a powder, if it is inserted into a breathable bag such as a non-woven fabric so that it does not scatter, its handleability can be further enhanced. Therefore, it is preferable.
[0018]
【Example】
EXAMPLES Next, the present invention will be described in more detail with reference to examples. However, the present invention is not limited by the following examples as a matter of course, and appropriate modifications are made within a range that can meet the purpose described above and below. It is also possible to carry out and they are all included in the technical scope of the present invention.
[0019]
Example 1
10 parts by weight of sodium nitrite, 10 parts by weight of benzotriazole, 0.3 part by weight of boric acid, 79.7 parts by weight of high-density polyethylene (“HW100P” manufactured by Mitsui Petrochemical Co., Ltd., molecular weight 900) were pulverized and mixed using a ball mill. Thereafter, 0.25 g of the mixture was used to pressurize to 700 kg using a rotary tablet machine to obtain a tablet-type vaporizable rust preventive having a diameter of 10 mm and a thickness of 4.2 mm.
[0020]
Example 2
The powder before pressure molding in Example 1 was used as it was, and 0.25 g of the powder was inserted into a 3 cm × 3 cm bag made of a nonwoven fabric (“Unicel BT-070E” manufactured by Teijin Ltd.) and heat sealed.
[0021]
Comparative Example 1
In Example 1, except that boric acid was omitted, 10 parts by weight of sodium nitrite, 10 parts by weight of benzotriazole, and 80 parts by weight of high density polyethylene (“HW100P” manufactured by Mitsui Petrochemical Co., Ltd., molecular weight 900) were used. In the same manner as in Example 1, the mixture was pulverized, mixed, and formulated into a tablet-type vaporizable rust preventive having a diameter of 10 mm and a thickness of 4.2 mm.
[0022]
Comparative Example 2
Dicyclohexylammonium nitrite (DICHAN) was used as a commercially available vaporizable rust preventive compound, and 0.25 g thereof was encapsulated in a nonwoven fabric in the same manner as in Example 2 above.
[0023]
Comparative Example 3
Benzotriazole was used as a commercially available non-metal vaporizable rust preventive compound, and 0.25 g thereof was encapsulated in a nonwoven fabric in the same manner as in Example 2 above.
[0024]
[Rust prevention test 1]
The vaporizable rust inhibitor obtained in the above Examples and Comparative Examples was subjected to a short-term vaporizable rust preventive test. About iron, the antirust ability was investigated based on the H-shaped test method of JISZ15194.4. For non-ferrous metals (copper, aluminum, aluminum castings), a 40 x 60 x 2 mm test piece is hung on a rubber stopper and sealed in a 1 liter jar with each vaporizable rust inhibitor, at 30 ° C. After standing for 18 hours, cool to 20 ° C., add 20 ml of deionized water into a wide-mouth bottle, seal, and then perform a thermal cycle test of 5 ° C. × 2 hours−50 ° C. × 3 hours−5 ° C. × 16 hours. The rusting state was visually evaluated. The results are shown in Table 1.
○: No occurrence of rust at all, ×: Obviously generation of rust is observed.
[0025]
[Table 1]
[Rust prevention test 2]
A long-term vaporizable rust preventive test was conducted for each vaporizable rust inhibitor obtained in the above Examples and Comparative Examples. For both ferrous and non-ferrous metals, 40 x 60 x 2 mm specimens are hung on rubber stoppers, and each vaporizable rust inhibitor is sealed in a 1 liter jar with 20 ml of water. And the rusting state after leaving in June was visually evaluated. The results are shown in Table 2.
○: No occurrence of rust at all, ×: Obviously generation of rust is observed.
[0027]
[Table 2]
As is clear from Tables 1 and 2, the vaporizable rust preventives of Examples 1 and 2 that satisfy the requirements of the present invention have an excellent rust preventive effect not only in short-term tests but also in long-term tests. On the other hand, Comparative Example 1 (in which no pH buffering agent is blended) and Comparative Example 3 (in which no rust preventive agent for steel itself is blended) have poor anticorrosive effects on iron, and Comparative Example In 2 (commercial vaporizable rust preventive), a satisfactory rust preventive effect is not obtained in the short-term vaporizable rust preventive test for both iron and non-ferrous metals.
[0029]
【The invention's effect】
The present invention is configured as described above, and by using nitrite in combination with a pH buffer, the steel material is given a sustained release of a rust-proof gas and exhibits a long-term rust-preventing effect, By using these in combination with benzotriazole or its derivatives, non-ferrous metal materials are also provided with an excellent rust-preventive effect. Furthermore, these rust-preventive ingredients are mixed with resin powders, especially in the form of granules and tablets. Even if it remains in powder form, it can be prevented from scattering by filling and sealing in a breathable bag such as non-woven fabric, and its handling can be improved, making it practical as a vaporizable rust inhibitor. It was possible to significantly improve the sex.
Claims (3)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27026096A JP3836546B2 (en) | 1996-10-11 | 1996-10-11 | Vaporizable rust preventive composition |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27026096A JP3836546B2 (en) | 1996-10-11 | 1996-10-11 | Vaporizable rust preventive composition |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH10114892A JPH10114892A (en) | 1998-05-06 |
| JP3836546B2 true JP3836546B2 (en) | 2006-10-25 |
Family
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP27026096A Expired - Fee Related JP3836546B2 (en) | 1996-10-11 | 1996-10-11 | Vaporizable rust preventive composition |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3836546B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100871509B1 (en) | 2007-06-18 | 2008-12-05 | 황인수 | Volatile corrosion inhibitor powder manufacturing method |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1910237B (en) * | 2004-01-19 | 2011-09-07 | 中部吉利斯德股份有限公司 | Volatile corrosion inhibitor, and forming material and formed article using the same |
| JP6432028B2 (en) * | 2014-12-18 | 2018-12-05 | 中部キレスト株式会社 | Vaporizable rust preventive |
| KR102316297B1 (en) * | 2015-04-13 | 2021-10-22 | 정용주 | Method for manufacturing rust Inhibitor and the rust Inhibitor manufactured by the same |
-
1996
- 1996-10-11 JP JP27026096A patent/JP3836546B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100871509B1 (en) | 2007-06-18 | 2008-12-05 | 황인수 | Volatile corrosion inhibitor powder manufacturing method |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH10114892A (en) | 1998-05-06 |
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