JP6764743B2 - Metal drums - Google Patents

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JP6764743B2
JP6764743B2 JP2016187805A JP2016187805A JP6764743B2 JP 6764743 B2 JP6764743 B2 JP 6764743B2 JP 2016187805 A JP2016187805 A JP 2016187805A JP 2016187805 A JP2016187805 A JP 2016187805A JP 6764743 B2 JP6764743 B2 JP 6764743B2
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paint
metal drum
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岩佐 浩樹
浩樹 岩佐
克範 藤村
克範 藤村
人詩 川田
人詩 川田
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JFE Container Co Ltd
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Description

本発明は、金属製ドラム缶に関する。 The present invention relates to metal drums.

例えば、食品、あるいは薬液等を収容するため、又は防錆用として、内面に樹脂コーティングを施した鋼製ドラム缶が存在する。 For example, there are steel drums having a resin coating on the inner surface for storing foods, chemicals, and the like, or for rust prevention.

「ドラム缶工業会」インターネットホームページ、<URL: http://www.jsda.gr.jp/index.html>"Drum Industry Association" Internet homepage, <URL: http://www.jsda.gr.jp/index.html>

しかしながら鋼製ドラム缶における従来の樹脂コーティングは、非粘着性能が十分ではない。ここで非粘着性能とは、撥水及び撥油性、離型性、及び防汚性を有する性質を言う。
よって鋼製ドラム缶における従来の樹脂コーティングは、例えば撥水等の撥液性能が十分ではなく、特に粘性の高い、つまり粘着性を有する液状体を収容した場合、ドラム缶内の樹脂コーティング表面に液状体が濡れ広がり粘着してしまう。その結果、そのような収容物の排出は容易ではなく、排出に際してドラム缶内の樹脂コーティング表面に多量の収容物が粘着したまま残り、収容物の全量を排出するのは困難であるという問題がある。
また、離型性が劣ることから、例えば粘着テープ等が粘着してしまうという問題もある。
However, the conventional resin coating on steel drums does not have sufficient non-adhesive performance. Here, the non-adhesive performance refers to properties having water repellency, oil repellency, mold releasability, and antifouling property.
Therefore, the conventional resin coating on steel drums does not have sufficient liquid repellency such as water repellency, and when a liquid material having particularly high viscosity, that is, stickiness is contained, the liquid material is applied to the surface of the resin coating in the drum can. Will get wet and spread and stick. As a result, it is not easy to discharge such contents, and there is a problem that it is difficult to discharge the entire amount of the contents because a large amount of the contents remain adhered to the resin coating surface in the drum can at the time of discharge. ..
Further, since the releasability is inferior, there is also a problem that, for example, an adhesive tape or the like sticks.

本発明は、このような問題点を解決するためになされたもので、従来に比べて優れた非粘着性能を有する内面を有する金属製ドラム缶を提供することを目的とする。 The present invention has been made to solve such a problem, and an object of the present invention is to provide a metal drum can having an inner surface having excellent non-adhesive performance as compared with the conventional one.

上記目的を達成するため、本発明は以下のように構成する。
即ち、本発明の第1態様における金属製ドラム缶は、金属製ドラム缶の内面を覆った被覆材を有し、この被覆材は、被覆表面の表面自由エネルギーのうち極性成分からなるエネルギーが5erg/cm未満であることを特徴とする。
In order to achieve the above object, the present invention is configured as follows.
That is, the metal drum can according to the first aspect of the present invention has a coating material that covers the inner surface of the metal drum can, and the coating material has an energy consisting of a polar component among the surface free energies of the coating surface of 5 erg / cm. It is characterized by being less than 2 .

本発明の第1態様における金属製ドラム缶によれば、表面自由エネルギーのうち極性成分からなるエネルギーが5erg/cm未満である被覆材を内面に有したことで、非粘着性能を有する缶内面を提供することができる。よって、収容物が被覆材にこびりつく、あるいは濡れ広がり粘着することを防ぐあるいは抑制することが可能になる。また、従来に比べて離型性及び防汚性を向上させることもできる。 According to the metal drum can according to the first aspect of the present invention, the inner surface of the can having non-adhesive performance is provided by having a coating material having an energy consisting of a polar component of the surface free energy of less than 5 erg / cm 2 on the inner surface. Can be provided. Therefore, it is possible to prevent or prevent the contained material from sticking to the covering material or spreading and sticking to the covering material. In addition, the releasability and antifouling property can be improved as compared with the conventional case.

本発明の実施形態における金属製ドラム缶を示す断面図である。It is sectional drawing which shows the metal drum can in embodiment of this invention.

本発明の実施形態である金属製ドラム缶について、図を参照しながら以下に説明する。尚、各図において、同一又は同様の構成部分については同じ符号を付している。また、以下の説明が不必要に冗長になるのを避け当業者の理解を容易にするため、既によく知られた事項の詳細説明及び実質的に同一の構成に対する重複説明を省略する場合がある。また、以下の説明及び添付図面の内容は、特許請求の範囲に記載の主題を限定することを意図するものではない。 The metal drum can according to the embodiment of the present invention will be described below with reference to the drawings. In each figure, the same or similar components are designated by the same reference numerals. In addition, in order to avoid unnecessary redundancy of the following explanations and facilitate understanding by those skilled in the art, detailed explanations of already well-known matters and duplicate explanations for substantially the same configuration may be omitted. .. In addition, the following description and the contents of the accompanying drawings are not intended to limit the subject matter described in the claims.

また、以下に説明する実施形態では、金属製ドラム缶として、JIS Z 1601に規定するような、内容量が約200リットルの鋼製ドラム缶を例に採るが、これに限定するものではなく、200リットルを超えるものも含む概念である。また、金属製ドラム缶は、胴体に地板及び天板を巻締めて接合した密閉型(タイトヘッドドラム)のみならず、胴体に対して天板を着脱自在としたオープン型も含む概念である。 Further, in the embodiment described below, as a metal drum can, a steel drum can having an internal capacity of about 200 liters as defined in JIS Z 1601 is taken as an example, but the present invention is not limited to this, and 200 liters is taken. It is a concept that includes things that exceed. Further, the metal drum can is a concept including not only a closed type (tight head drum) in which a main plate and a top plate are wound and joined to the body, but also an open type in which the top plate is detachably attached to the body.

図1には、本実施形態における鋼製ドラム缶100を示している。この鋼製ドラム缶100は、金属製で円筒状に成形された中空の胴体101と、胴体101の下端開口を閉塞する金属製の地板102と、胴体101の上端開口を閉塞する金属製の天板103とを有する。尚、図1は、胴体101に対して地板102及び天板103が巻締められた上述の密閉型(タイトヘッドドラム)の鋼製ドラム缶100を示している。
また天板103は、内容物の出し入れに使用される開口部である大栓111、及び大栓111より小径で主に空気穴としての小栓112を有する。
FIG. 1 shows a steel drum 100 according to the present embodiment. The steel drum 100 includes a hollow body 101 made of metal and formed into a cylindrical shape, a metal base plate 102 that closes the lower end opening of the body 101, and a metal top plate that closes the upper end opening of the body 101. It has 103 and. FIG. 1 shows the above-mentioned closed type (tight head drum) steel drum can 100 in which the main plate 102 and the top plate 103 are wound around the body 101.
Further, the top plate 103 has a large plug 111 which is an opening used for taking in and out the contents, and a small plug 112 which is smaller in diameter than the large plug 111 and mainly serves as an air hole.

さらに、このように構成される鋼製ドラム缶100は、その内面の全面を覆った被覆材110を有する。上記オープン型の鋼製ドラム缶100の場合には、天板内面に、別途、被覆材110を被覆した天板103が使用される。 Further, the steel drum 100 configured in this way has a covering material 110 that covers the entire inner surface thereof. In the case of the open type steel drum 100, a top plate 103 having a covering material 110 coated on the inner surface of the top plate is used separately.

被覆材110は、鋼製ドラム缶100の内面101aに対して焼付けによって固着される。被覆材110の膜厚は、特に規定しないが、コスト面を考慮すると、例えば10〜50μm程度である。このような被覆材110は、以下の構成を有する。 The covering material 110 is fixed to the inner surface 101a of the steel drum 100 by baking. The film thickness of the covering material 110 is not particularly specified, but is, for example, about 10 to 50 μm in consideration of cost. Such a covering material 110 has the following configuration.

被覆材110は、非粘着性能を有し、つまり、撥水及び撥油性、離型性、及び防汚性を有する。そのため被覆材110の表面では、無極性になることが重要になる。具体的には、被覆材110は、表面の表面自由エネルギーのうち極性成分からなるエネルギーが5erg/cm未満の材料である。このような被覆材110によれば、従来に比べて非粘着性能が向上し、例えば収容物の接着性を小さくでき、収容物のこびりつき、あるいは被覆材表面の汚染を有効に抑制することが可能になる。 The coating material 110 has non-adhesive performance, that is, has water and oil repellency, mold releasability, and antifouling property. Therefore, it is important that the surface of the covering material 110 is non-polar. Specifically, the covering material 110 is a material in which the energy composed of polar components among the surface free energies of the surface is less than 5 erg / cm 2 . According to such a covering material 110, the non-adhesive performance is improved as compared with the conventional case, for example, the adhesiveness of the contained material can be reduced, and the sticking of the contained material or the contamination of the surface of the covering material can be effectively suppressed. become.

上の構成に対して、被覆材110は、さらに以下の構成の少なくとも一つを有することができる。
即ち、被覆材110は、重量比で20%〜90%の塗膜形成用シリコーン樹脂エマルジョンと、80%〜10%の付加反応型のシリコーンエマルジョンとを有する水系撥水材であってもよい。ここで、重量比における各範囲の値は、鋼製ドラム缶100の内面101aに固着された状態、つまり焼付け後における値である。
For the above configuration, the dressing 110 may further have at least one of the following configurations:
That is, the coating material 110 may be a water-based water-repellent material having a 20% to 90% weight ratio silicone resin emulsion for forming a coating film and an 80% to 10% addition reaction type silicone emulsion. Here, the value in each range in the weight ratio is a value in a state of being fixed to the inner surface 101a of the steel drum 100, that is, a value after baking.

また被覆材110は、必須単位として、フルオロオレフィン系単量体と、シラン系単量体とに基づく重合単位を有してもよい。ここで、フルオロオレフィン系単量体の一例としてテトラフルオロエチレン等が挙げられ、シラン系単量体の一例としてビニロキシシラン、アリロキシシラン、又はイソプロペノキシシラン等が挙げられる。また必要により、炭化水素系単量体、及び硬化反応性部位を有する単量体に基づく単位を有する重合体を含むことができる。 Further, the coating material 110 may have a polymerization unit based on a fluoroolefin-based monomer and a silane-based monomer as essential units. Here, tetrafluoroethylene and the like can be mentioned as an example of the fluoroolefin-based monomer, and vinyloxysilane, allyloxysilane, isopropenoxysilane and the like can be mentioned as an example of the silane-based monomer. Further, if necessary, a hydrocarbon-based monomer and a polymer having a unit based on the monomer having a curing reactive site can be included.

また被覆材110は、10%〜30%の固形油脂と、70%〜90%の変性シリコーンとを含有してもよく、ここで上記固形油脂及び上記変性シリコーンの合計で100%である。ここで各範囲の値は、鋼製ドラム缶100の内面101aに固着された状態、つまり焼付け後における値である。 Further, the covering material 110 may contain 10% to 30% of solid fat and oil and 70% to 90% of modified silicone, and here, the total of the solid fat and oil and the modified silicone is 100%. Here, the values in each range are values in a state of being fixed to the inner surface 101a of the steel drum 100, that is, after baking.

ここで上記固形油脂は、パラフィンワックスであってもよい。 Here, the solid fat and oil may be paraffin wax.

ここで上記固形油脂は、天然油脂であってもよい。 Here, the solid fat and oil may be a natural fat and oil.

また被覆材110は、フッ素−シロキサングラフトポリマーと、上記フッ素−シロキサングラフトポリマーの硬化剤とを有する組成物であってもよい。 Further, the coating material 110 may be a composition having a fluorine-siloxane graft polymer and a curing agent for the fluorine-siloxane graft polymer.

また被覆材110は、ポリエステル系樹脂を主成分とした塗料を内面101aに塗布し、焼付け、乾燥させ、固着した状態のものであってもよく、ここで上記塗料は、当該塗料の固形分の0.2〜1.0wt%のアミノ変性シリコーンオイルと、ポリエステル系樹脂との反応当量より0.5〜3.0wt%過剰添加したメラミン硬化剤とを含むことができる。 Further, the coating material 110 may be in a state where a paint containing a polyester resin as a main component is applied to the inner surface 101a, baked, dried and fixed, and the above-mentioned paint is the solid content of the paint. It can contain 0.2 to 1.0 wt% of amino-modified silicone oil and a melamine curing agent added in excess of 0.5 to 3.0 wt% based on the reaction equivalent of the polyester resin.

さらにまた被覆材110は、第1含フッ素エチレン性単量体と、第2含フッ素エチレン性単量体とを共重合してなる含フッ素エチレン性重合体であってもよく、ここで、第1含フッ素エチレン性単量体は、ヒドロキシル基、カルボキシル基、カルボン酸塩、及びエポキシ基の少なくとも一つの官能基を有し、第2含フッ素エチレン性単量体は、上記官能基を有していない。このような被覆材110は、上記第1含フッ素エチレン性単量体の0.05〜30モル%と、上記第2含フッ素エチレン性単量体の70〜99.95モル%とを共重合してなる含フッ素エチレン性重合体であることができる。 Furthermore, the coating material 110 may be a fluorine-containing ethylenic polymer obtained by copolymerizing a first fluorine-containing ethylenic monomer and a second fluorine-containing ethylenic monomer. The 1-fluorinated ethylene monomer has at least one functional group of a hydroxyl group, a carboxyl group, a carboxylate, and an epoxy group, and the second fluoroethylene monomer has the above functional group. Not. In such a coating material 110, 0.05 to 30 mol% of the first fluorine-containing ethylenic monomer and 70 to 99.95 mol% of the second fluorine-containing ethylenic monomer are copolymerized. It can be a fluorine-containing ethylenic polymer.

以上説明した被覆材110を有する鋼製ドラム缶100は、以下のような効果を有する。
即ち、鋼製ドラム缶100は、従来に比べて非粘着性能が向上した缶内面を有し、例えば撥液性(撥水性、撥油性)を長期にわたって持続することができる。よって、粘性の高低にかかわらずいずれの液状体も被覆材110に、こびりつく、あるいは濡れ広がり粘着することを防ぐあるいは抑制することができる。また、被覆材110は、実用的な耐久性を有する。したがって、鋼製ドラム缶100から液状体を容易に取り出し可能で、ほぼ全量を取り出すことができ、従来に比べて缶内残量を著しく減少させることができる。また、内壁汚染もほとんど発生しない。さらに、鋼製ドラム缶100の使用後の再利用にあっては、缶内の洗浄が容易になり、残った収容物及び洗浄液等の廃液が環境に与える影響も従来に比べて小さくすることができる。
さらにまた、従来に比べて離型性及び防汚性も向上可能である。
The steel drum 100 having the covering material 110 described above has the following effects.
That is, the steel drum can 100 has a can inner surface having improved non-adhesive performance as compared with the conventional one, and can maintain, for example, liquid repellency (water repellency, oil repellency) for a long period of time. Therefore, it is possible to prevent or suppress that any liquid material sticks to the coating material 110 or spreads wet and adheres to the coating material 110 regardless of the viscosity. Further, the covering material 110 has practical durability. Therefore, the liquid material can be easily taken out from the steel drum can 100, and almost the entire amount can be taken out, and the remaining amount in the can can be remarkably reduced as compared with the conventional case. In addition, there is almost no inner wall contamination. Further, when the steel drum can 100 is reused after use, the inside of the can can be easily cleaned, and the influence of the remaining contained matter and waste liquid such as the cleaning liquid on the environment can be reduced as compared with the conventional case. ..
Furthermore, the releasability and antifouling property can be improved as compared with the conventional case.

本発明は、金属製ドラム缶に適用可能である。 The present invention is applicable to metal drums.

100…鋼製ドラム缶、110…被覆材。 100 ... Steel drums, 110 ... Covering material.

Claims (9)

金属製ドラム缶の内面を覆った被覆材(110)を形成する塗料、当該ドラム缶の収容物で粘着性を有する液状体である収容物の全量を排出可能とし離型性及び防汚性を有する塗料を有し、上記内面に焼付けられた上記塗料は、被覆表面の表面自由エネルギーのうち極性成分からなるエネルギーが5erg/cm未満であることを特徴とする金属製ドラム缶。 A paint that forms a coating material (110) that covers the inner surface of a metal drum can, and has releasability and antifouling properties by enabling discharge of the entire amount of the contained liquid substance that is a sticky liquid in the contained material of the drum can. The paint having a paint and being baked on the inner surface is a metal drum can characterized in that the energy consisting of a polar component among the surface free energies of the coating surface is less than 5 erg / cm 2 . 上記内面に焼付けられた上記塗料は、重量比で20%〜90%の塗膜形成用シリコーン樹脂エマルジョンと、80%〜10%の付加反応型のシリコーンエマルジョンとを有する水系撥水材である、請求項1に記載の金属製ドラム缶。 The paint baked on the inner surface is a water-based water-repellent material having a 20% to 90% weight ratio silicone resin emulsion for forming a coating film and an 80% to 10% addition reaction type silicone emulsion. The metal drum can according to claim 1. 上記内面に焼付けられた上記塗料は、フルオロオレフィン系単量体と、シラン系単量体とに基づく重合単位を有する、請求項1に記載の金属製ドラム缶。 The metal drum can according to claim 1, wherein the coating material baked on the inner surface has a polymerization unit based on a fluoroolefin-based monomer and a silane-based monomer. 上記内面に焼付けられた上記塗料は、10%〜30%の固形油脂と、70%〜90%の変性シリコーンとを含有し、ここで上記固形油脂及び上記変性シリコーンの合計で100%である、請求項1に記載の金属製ドラム缶。 The paint baked on the inner surface contains 10% to 30% of solid fat and oil and 70% to 90% of modified silicone, and the total of the solid fat and oil and the modified silicone is 100%. The metal drum can according to claim 1. 上記固形油脂は、パラフィンワックスである、請求項4に記載の金属製ドラム缶。 The metal drum can according to claim 4, wherein the solid fat is paraffin wax. 上記固形油脂は、天然油脂である、請求項4に記載の金属製ドラム缶。 The metal drum can according to claim 4, wherein the solid fat is a natural fat. 上記内面に焼付けられた上記塗料は、フッ素−シロキサングラフトポリマーと、上記フッ素−シロキサングラフトポリマーの硬化剤とを有する組成物である、請求項1に記載の金属製ドラム缶。 The metal drum can according to claim 1, wherein the coating material baked on the inner surface is a composition having a fluorine-siloxane graft polymer and a curing agent for the fluorine-siloxane graft polymer. 上記塗料は、ポリエステル系樹脂を主成分とした塗料を上記内面に焼付けた状態のものであり、ここで上記塗料は、当該塗料の固形分の0.2〜1.0wt%のアミノ変性シリコーンオイルと、ポリエステル系樹脂との反応当量より0.5〜3.0wt%過剰添加したメラミン硬化剤とを含む、請求項1に記載の金属製ドラム缶。 The paint is a state in which a paint containing a polyester resin as a main component is baked on the inner surface, and the paint is an amino-modified silicone oil having a solid content of 0.2 to 1.0 wt% of the paint. The metal drum can according to claim 1, further comprising the melamine curing agent added in excess of 0.5 to 3.0 wt% from the reaction equivalent with the polyester resin. 上記内面に焼付けられた上記塗料は、第1含フッ素エチレン性単量体と、第2含フッ素エチレン性単量体とを共重合してなる含フッ素エチレン性重合体であり、
上記第1含フッ素エチレン性単量体は、ヒドロキシル基、カルボキシル基、カルボン酸塩、及びエポキシ基の少なくとも一つの官能基を有し、
上記第2含フッ素エチレン性単量体は、上記官能基を有さず、
上記第1含フッ素エチレン性単量体の0.05〜30モル%と、上記第2含フッ素エチレン性単量体の70〜99.95モル%とを共重合してなる含フッ素エチレン性重合体である、請求項1に記載の金属製ドラム缶。
The paint baked on the inner surface is a fluorinated ethylenic polymer obtained by copolymerizing a first fluorinated ethylenic monomer and a second fluorinated ethylenic monomer.
The first fluoroethylene monomer has at least one functional group of a hydroxyl group, a carboxyl group, a carboxylate, and an epoxy group.
The second fluorine-containing ethylenic monomer does not have the functional group and has no functional group.
Fluorine-containing ethylenic weight obtained by copolymerizing 0.05 to 30 mol% of the first fluorine-containing ethylenic monomer and 70 to 99.95 mol% of the second fluorine-containing ethylenic monomer. The metal drum can according to claim 1, which is a coalescence.
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