JP3973759B2 - Hot rolling oil composition for aluminum and hot rolling oil for emulsion type aluminum - Google Patents
Hot rolling oil composition for aluminum and hot rolling oil for emulsion type aluminum Download PDFInfo
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Description
【0001】
【発明の属する技術分野】
本発明は、アルミニウム材(アルミニウム合金材を含む。以下同様。)を圧延して板や条に加工する際、潤滑及び冷却を目的として、圧延ロールや圧延材にエマルジョンとして吹き付けるアルミニウム用熱間圧延油組成物に関する。
【0002】
【従来の技術】
アルミニウムの熱間圧延加工では、従来、鉱油を基油とし油性剤を加えたものを乳化剤により水に乳化した圧延油をエマルジョンとして潤滑、冷却のために使用されているが、これは通常循環使用されている。この圧延油としては、従来、油性剤としてオレイン酸、乳化剤としてオレイン酸のアミンエステルを含む圧延油が多く使用されてきたが、圧延の進行に伴う乳化状態の変動という問題点がある。
また近年、熱間圧延工程における圧延効率及びアルミニウム材の表面品質の向上の観点から、潤滑性及び摩耗粉の除去性能を一層向上しうる圧延油の開発が要求されるようになってきている。
この摩耗粉の除去については、ペーパー濾紙を用いた吸引又は加圧濾過を行う方法があるが、圧延工程における潤滑性及び圧延効率向上の観点からは、スカムアウトと呼ばれる、摩耗粉を分離油分とともに浮上させ、スキマーによって除去する方法も重要であり、通常両方法が併用されている。しかし例えば、油性剤、ポリエチレングリコール型非イオン界面活性剤、脂肪酸、トリエタノールアミン及び精製鉱油を特定の割合で含有する従来のエマルジョン型圧延油(特開平8−183987号)では適度な油分離が生じにくく、摩耗粉の除去性能(スカムアウト性)は必ずしも満足できるものではない。これは熱間圧延工程下において、乳化安定性、潤滑性を保持しながら前記のスカムアウト性を高めることは必ずしも容易ではないからである。
一方、環境問題の上からも、使用後のエマルジョン型圧延油の処理方法が問題となってきており、廃液処理の際に容易に油水分離しうる圧延油が望まれており、廃液中に多量の窒素化合物を流出させない圧延油の開発が望まれている。
【0003】
【発明が解決しようとする課題】
したがって、本発明の目的は、熱間圧延工程で用いられ、乳化安定性と潤滑性を保持しながら、優れたスカムアウト性を同時に具備し、かつ、エマルジョンを形成することのできるアルミニウム用熱間圧延油組成物を提供することを目的とする。
【0004】
【課題を解決するための手段】
従来のアルミニウム用熱間圧延油組成物の有する上記問題点を解決するため、種々検討を行った結果、摩耗粉の除去性能を向上するにはエマルジョンの乳化力をコントロールし、エマルジョンをルーズ(エマルジョン中の油滴の平均粒径が比較的大きく、油滴の粒径の分布が比較的広い)な状態に保つことがその目的達成に効果的であること、また、トリエタノールアミン、界面活性剤及び脂肪酸、を所定比率で基油に添加することにより、エマルジョン調製直後からエマルジョンをルーズに調製でき、スカムアウト性を向上させ、しかも乳化安定性、潤滑性を維持できること、したがって、部分更油又は全量更油を行うことなく長期間にわたってエマルジョンの循環使用ができ、廃液の排出量を大幅に減少させることができることを見い出し、この知見に基づき本発明をなすに至った。
【0005】
すなわち本発明は、
(1)(a)トリエタノールアミン0.01〜0.05wt%、(b)非イオン界面活性剤及び陰イオン界面活性剤から選ばれる少なくとも1種を0.5〜1.0wt%及び(c)脂肪酸1.5〜15.0wt%を含有し残部が精製鉱油、精製油脂及び合成油から選ばれる少なくとも1種よりなることを特徴とするアルミニウム用熱間圧延油組成物、及び
(2)(a)トリエタノールアミン0.01〜0.05wt%、(b)非イオン界面活性剤及び陰イオン界面活性剤から選ばれる少なくとも1種を0.5〜1.0wt%及び(c)脂肪酸1.5〜15.0wt%を含有し残部が精製鉱油、精製油脂及び合成油から選ばれる少なくとも1種よりなる組成物を水に乳化させてなることを特徴とするエマルジョン型アルミニウム用熱間圧延油
を提供するものである。
【0006】
【発明の実施の形態】
本発明のアルミニウム用熱間圧延油組成物は、上記のようにトリエタノールアミン含有量が非常に少量であり、好ましくは0.02〜0.05wt%であり、より好ましくは0.02〜0.04wt%の範囲である。0.01wt%未満では乳化安定性が極端に低下し、0.05wt%を越えて含有するとエマルジョンがタイト(エマルジョン中の油滴の平均粒径が比較的小さく、油滴の粒径の分布が比較的狭い)化し、廃液処理の際には油水分離が困難になる。
本発明のアルミニウム用熱間圧延油組成物の含有する非イオン界面活性剤及び陰イオン界面活性剤の少なくとも1種の含有量は、通常0.5〜1.0wt%の範囲であり、好ましくは0.6〜1.0wt%である。0.5wt%未満ではエマルジョンの乳化安定性が極端に低下し、1.0wt%を越えて含有するとエマルジョンがタイト化する。本発明のアルミニウム用熱間圧延油組成物に用いられる非イオン界面活性剤としては、エステル型としてグリセリン脂肪酸エステル、ソルビタン脂肪酸エステル等が、エーテル型としてポリオキシエチレンアルキルフェニルエーテル、ポリオキシエチレンアルキルエーテル等が、エステルエーテル型としてポリエチレングリコール脂肪酸エステル等が、アルカノールアミド型として脂肪酸アルカノールアミド等が挙げられるが、好ましくはエステルエーテル型である。また、陰イオン界面活性剤は、カルボン酸型として脂肪酸モノカルボン酸塩、N−アシロイルグルタミン酸塩等が、スルホン酸型としてアルキルベンゼンスルホン酸塩等が、硫酸エステル型として硫酸アルキル塩等が、リン酸エステル型としてリン酸アルキル塩等が挙げられるが、好ましくはスルホン酸型である。
本発明のアルミニウム用熱間圧延油組成物に含まれる脂肪酸の含有量は、通常1.5〜15.0wt%であるが、好ましくは2.0〜14.0wt%である。1.5wt%未満では潤滑性向上の効果が不十分であり、15.0wt%を越えると腐食性に対して好ましくない。脂肪酸は、ステアリン酸、オレイン酸、リノレン酸等が挙げられ、好ましくはオレイン酸である。脂肪酸は、飽和脂肪酸よりも不飽和脂肪酸が油膜強度向上の上で好ましい。
本発明のアルミニウム用熱間圧延油組成物に用いられる基油は、精製鉱油及び精製油脂、合成油のいずれでも良く、少なくとも1種よりなることを特徴とする。ここで、鉱油はパラフィン系、ナフテン系のいずれでも良く、油脂は植物性、動物性のいずれでも良い。また、合成油としてはポリアルファオレフィン、エステル類等を挙げることができる。基油の代表的なものとして、パラフィン系鉱油があり分子量は、好ましくは200〜800、より好ましくは400〜600である。
本発明のエマルジョン型アルミニウム用熱間圧延油は、上記のアルミニウム用熱間圧延油組成物を通常用いられる方法により水に乳化分散することにより調製することができる。圧延油中のアルミニウム用熱間圧延油組成物の濃度は、通常3〜8wt%であり、4〜6wt%が好ましい。また本発明のエマルジョンの平均粒径(エマルジョン中の油滴の平均粒径)は、通常2〜10μmであるが5〜7μmであることが好ましい。2μm未満では、乳化安定性に優れるがスカムアウト性が悪化する。10μmを越えるとエマルジョンの平均粒径が大きくなり過ぎ、乳化安定性が極めて悪くなる。また、エマルジョンの粒径の分布(エマルジョン中の油滴の粒径の分布)は、通常全油滴の80%が1〜20μmの範囲にあり、5〜7μmであることが好ましい。2μm未満の粒子を多く含むとスカムアウト性が悪化する。10μmを越える粒子を多く含むと乳化安定性が悪化する。
【0007】
本発明は、トリエタノールアミン、界面活性剤及び脂肪酸を精製鉱油、精製油脂及び合成油から選ばれる少なくとも1種に対して上記組成で含有することで、以下に記載した優れた作用を有するものである。
(1)エマルジョン型圧延油として調製直後から、適正な、エマルジョンの平均粒径及び粒径の分布を示し、圧延加工が効率よく安定化して行われ、安定した操業が可能となる。
(2)エマルジョンをルーズにすることができ、優れたスカムアウト性を有するため、圧延油中の摩耗粉などの汚れ蓄積を抑制できる。
(3)過剰な粒径成長を抑制でき、ルーズなエマルジョンを高温下においても安定的に長期間保持することができる。
(4)エマルジョンをルーズかつ安定的に保持できるため、製品の優れた表面品質を得られることに加え、エマルジョン性状に左右されない安定した圧延加工が行われ、安定した操業を行うことができる。
(5)エマルジョン型圧延油が廃液となった際の処理が容易となる。
【0008】
【実施例】
次に本発明を実施例に基づき説明するが本発明は以下の実施例に限定されるものではない。
図1に示した大型循環試験機を用いて試験した。図1中、1は大型循環試験機を付設した圧延機、2はリターンピット、3はリターンポンプ、4はベルトスキマー、5はドラムスキマー、6はダーティタンク、7はフィルターポンプ、8はフィルター、9はクリーンタンク、10はサプライポンプを示す。
エマルジョンの調製は、表1に示したアルミニウム用熱間圧延油組成物を60℃に加温した純水に少量ずつ加えたものを、図1中のクリーンタンク9に加え、試験機を作動させてリターンポンプ3、フィルターポンプ7及びサプライポンプ10を介して、スプレーノズル11からエマルジョンに対して強烈な攪拌力を与えるようにスプレーして、圧延油を循環させた(スプレー循環)。そして形成されたエマルジョンの平均粒径が変化しなくなるところまで十分スプレー循環を行った。エマルジョンの油分濃度(圧延油組成物の濃度)は、5wt%に調製した。
次に、圧延機1を作動させ、上記試験機を用いエマルジョン型圧延油1種類につき、1日に8時間、循環及び熱間圧延を行い、それを6か月間継続した。熱間圧延は450℃にて行った。
熱間圧延中、各エマルジョンは図1に示したリターンポンプ3、フィルターポンプ7及びサプライポンプ10の3台のポンプ、圧延機1へのスプレーにより高せん断応力が付加され強烈に攪拌される。ここで、サプライポンプ10は吐出量が80m3 /hで運転される。また、圧延によって発生した摩耗粉は、スカムアウト性の試験のためにフィルター8では除去されないようにし(濾紙を抜いてある)、分離した油分とともに浮上したもののみ、ダーティタンク6に設置されているベルトスキマー4及びドラムスキマー5によって系外に排出されるようにした。アルミニウム板としては純アルミ系材料(圧下率50%)を用いた。
【0009】
【表1】
【0010】
このように6か月循環使用後、クリーンタンク9の中層部分からエマルジョンサンプルを取り、以下に示す方法で、乳化安定性、圧延油汚れの度合い、潤滑性を試験し、また圧延後のアルミニウム板の表面品質を試験した。
(乳化安定性)
▲1▼比色管にエマルジョンサンプルを各々100mlずつ採取し、丸1日放置後、分離する状態をフリーオイル、スカム、クリームの量で調べた。
▲2▼比色管にエマルジョンサンプルを各々100mlずつ採取し、遠心分離器で1500±200rpmで20分間分離操作を行い、フリーオイル、スカム、クリームの量を調べた。
(圧延油汚れの度合い)
エマルジョンを脱水し、残った油分(汚れを含む)を電気炉で予備灰化処理を行った後、775℃のマッフル炉内で2時間、完全に灰化させ、残渣物を「灰分」として評価した。
(潤滑性)
▲1▼ロードセルより検出される圧延荷重の大小、及び▲2▼上記圧延荷重、及び先進率より計算によって求められる摩擦係数により評価した。
◎:摩擦係数0.08以下、○:摩擦係数0.1〜0.2、×:摩擦係数0.3以上
(アルミニウム板の表面品質)
▲1▼陽極酸化処理(アルマイト)し、顕微鏡による観察、及び▲2▼素板の光沢により評価した。
○:ピックアップスコア2未満、×:ピックアップスコア2以上
(エマルジョンの平均粒径の測定)
生理食塩水にてエマルジョンを10000倍に希釈し、コールターカウンターにて測定した。
(エマルジョンの粒径の分布の測定)
生理食塩水にてエマルジョンを10000倍に希釈し、コールターカウンターにて測定した。
試験結果及び評価を表2に示した。
【0011】
【表2】
【0012】
表2に示した結果から、次のことが分かる。
(1)油剤Aは乳化安定性が優れるが、油分離が生じないため、圧延油中に摩耗粉の浮上が起こらず、圧延油中に摩耗粉の蓄積が激しい。それに加えてエマルジョンの平均粒径が小さいため、潤滑性が乏しく、圧延後のアルミニウム板表面の品質も悪い、また、圧延速度を上げると焼き付きが発生する。
(2)油剤Bは、乳化不完全の状態であり、乳化安定性が極めて悪い。しかし、激しく分離油の浮上が起こるため、スカムアウト性は良好で汚れの蓄積は少ない。しかし、乳化安定性が悪いので上記試験機に補給直後から、投入した圧延油の油分が浮上してしまい、油分濃度を保持するのは困難であり、循環使用できない。なお、大量の圧延油の補給を連続的に実施することで油分濃度を一定に保持すれば、潤滑性は良好である。しかし、板の表面性状は均一性に欠け、品質的に良好とはいえない。
(3)油剤Cは、トリエタノールアミン量が少ないことに加えて、脂肪酸量が非常に高いため乳化安定性が悪い。更に潤滑過多であるため、圧延の際の板かみ込み性が極めて悪い。しかし、分離油の浮上は起こるため、スカムアウト性は良好で汚れの蓄積は少ない。
(4)油剤Dは、乳化安定性は良好であるが、エマルジョン粒径が小さいため、潤滑性、表面品質とも良くない。更に油浮上も少ないため汚れの蓄積が多いことに加えて廃油処理性が悪い。
(5)油剤Eは、乳化安定性は比較的良好であるが、油分離が生じにくく、油浮上が少ないため、汚れの蓄積が多い。更にエマルジョン粒径が小さいため潤滑性も良好とはいえない。
(6)本発明油剤F〜Hは、エマルジョン調製直後から6か月経過後まで、エマルジョンの粒径が安定的に5〜8μmの範囲にあり、乳化安定性が良好であるうえに、スカムアウト性も良く、圧延油中の汚れの蓄積は少ない。また潤滑性は優れており、アルミニウム板表面の品質も良好であった。更に廃油処理性も優れていた。
【0013】
【発明の効果】
本発明のアルミニウム用熱間圧延油組成物から得られるエマルジョンは、乳化安定性を保持しながらエマルジョンをルーズにすることができ、圧延工程に高せん断応力の付加される循環機を付設した循環系に使用して、部分更油又は全量更油することがなくとも長期間安定な操業が可能である。また、このようなエマルジョン型アルミニウム用熱間圧延油によれば優れたスカムアウト性と乳化安定性を両立し、圧延油の機能である潤滑性が良好であり、優れた表面品質の圧延アルミニウム板を提供しうるものである。
【図面の簡単な説明】
【図1】大型循環試験機の説明図である。[0001]
BACKGROUND OF THE INVENTION
The present invention is a hot rolling for aluminum in which an aluminum material (including an aluminum alloy material; the same applies hereinafter) is rolled into a sheet or strip and sprayed as an emulsion onto a rolling roll or rolled material for the purpose of lubrication and cooling. It relates to an oil composition.
[0002]
[Prior art]
In hot rolling of aluminum, conventionally, rolling oil obtained by emulsifying mineral oil into base oil and adding an oil-based agent in water using an emulsifier has been used as an emulsion for lubrication and cooling. Has been. Conventionally, as this rolling oil, many rolling oils containing oleic acid as an oiliness agent and an amine ester of oleic acid as an emulsifier have been used. However, there is a problem that the emulsified state varies with the progress of rolling.
In recent years, from the viewpoint of improving rolling efficiency and surface quality of aluminum materials in the hot rolling process, development of rolling oil that can further improve lubricity and wear powder removal performance has been required.
For removal of this wear powder, there is a method of suction or pressure filtration using paper filter paper, but from the viewpoint of improving lubricity and rolling efficiency in the rolling process, the wear powder is called scum out together with the separated oil. The method of floating and removing with a skimmer is also important, and both methods are usually used in combination. However, for example, conventional emulsion-type rolling oil (Japanese Patent Laid-Open No. Hei 8-183987) containing oily agents, polyethylene glycol-type nonionic surfactants, fatty acids, triethanolamine and refined mineral oil in a specific ratio does not provide appropriate oil separation. The abrasion powder removal performance (scum-out property) is not always satisfactory. This is because it is not always easy to improve the scum out property while maintaining emulsification stability and lubricity under the hot rolling process.
On the other hand, from the viewpoint of environmental problems, the processing method of emulsion-type rolling oil after use has become a problem, and rolling oil that can be easily separated into oil and water during waste liquid treatment is desired. Development of a rolling oil that does not allow any nitrogen compounds to flow out is desired.
[0003]
[Problems to be solved by the invention]
Therefore, the object of the present invention is a hot for aluminum which is used in a hot rolling process and has excellent scum-out properties while maintaining emulsion stability and lubricity, and can form an emulsion. An object is to provide a rolling oil composition.
[0004]
[Means for Solving the Problems]
As a result of various studies to solve the above-mentioned problems of conventional hot rolling oil compositions for aluminum, the emulsification power of the emulsion is controlled to improve the removal performance of the abrasion powder, and the emulsion is loosened (emulsion The average particle size of the oil droplets in the inside is relatively large and the distribution of the particle size of the oil droplets is relatively wide) is effective in achieving the purpose, and triethanolamine, surfactant And a fatty acid in a predetermined ratio to the base oil, the emulsion can be prepared loosely immediately after the preparation of the emulsion, the scum-out property can be improved, and the emulsion stability and lubricity can be maintained. It has been found that the emulsion can be circulated over a long period of time without changing the total amount of oil, and the amount of waste liquid discharged can be greatly reduced. , The present invention has been accomplished based on this finding.
[0005]
That is, the present invention
(1) (a) 0.01 to 0.05 wt% of triethanolamine, (b) 0.5 to 1.0 wt% of at least one selected from a nonionic surfactant and an anionic surfactant, and (c ) A hot rolled oil composition for aluminum, which contains 1.5 to 15.0 wt% of fatty acid, and the balance is at least one selected from refined mineral oil, refined oil and fat, and synthetic oil, and (2) ( a) Triethanolamine 0.01 to 0.05 wt%, (b) 0.5 to 1.0 wt% of at least one selected from a nonionic surfactant and an anionic surfactant, and (c) fatty acid 1. A hot rolling oil for emulsion type aluminum, comprising 5 to 15.0 wt%, the balance being emulsified in water with a composition comprising at least one selected from refined mineral oil, refined fat and oil, and synthetic oil It is intended to provide.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
The hot rolling oil composition for aluminum of the present invention has a very small triethanolamine content as described above, preferably 0.02 to 0.05 wt%, more preferably 0.02 to 0. .04 wt% range. If it is less than 0.01 wt%, the emulsion stability is extremely lowered, and if it exceeds 0.05 wt%, the emulsion becomes tight (the average particle size of the oil droplets in the emulsion is relatively small, and the distribution of the particle size of the oil droplets is It becomes relatively narrow), and oil / water separation becomes difficult during waste liquid treatment.
The content of at least one of the nonionic surfactant and the anionic surfactant contained in the hot rolling oil composition for aluminum of the present invention is usually in the range of 0.5 to 1.0 wt%, preferably 0.6 to 1.0 wt%. If it is less than 0.5 wt%, the emulsion stability of the emulsion is extremely lowered, and if it exceeds 1.0 wt%, the emulsion becomes tight. Examples of the nonionic surfactant used in the hot rolling oil composition for aluminum of the present invention include glycerol fatty acid esters and sorbitan fatty acid esters as ester types, and polyoxyethylene alkylphenyl ethers and polyoxyethylene alkyl ethers as ether types. And the like, polyethylene glycol fatty acid ester and the like as the ester ether type, and fatty acid alkanolamide and the like as the alkanolamide type. Anionic surfactants include fatty acid monocarboxylates and N-acyloyl glutamate as carboxylic acid types, alkylbenzene sulfonates as sulfonic acid types, alkyl sulfate salts as sulfate ester types, Examples of the acid ester type include alkyl phosphates, and the sulfonic acid type is preferable.
The content of the fatty acid contained in the hot rolling oil composition for aluminum of the present invention is usually 1.5 to 15.0 wt%, preferably 2.0 to 14.0 wt%. If it is less than 1.5 wt%, the effect of improving lubricity is insufficient, and if it exceeds 15.0 wt%, it is not preferable for corrosiveness. Examples of the fatty acid include stearic acid, oleic acid, linolenic acid, and the like, preferably oleic acid. As the fatty acid, an unsaturated fatty acid is preferable to a saturated fatty acid in terms of improving oil film strength.
The base oil used in the hot rolling oil composition for aluminum of the present invention may be any of refined mineral oil, refined oil and fat, and synthetic oil, and is characterized by comprising at least one kind. Here, the mineral oil may be either paraffinic or naphthenic, and the oil may be vegetable or animal. Examples of synthetic oils include polyalphaolefins and esters. A typical base oil is paraffinic mineral oil, and the molecular weight is preferably 200 to 800, more preferably 400 to 600.
The hot rolled oil for emulsion-type aluminum of the present invention can be prepared by emulsifying and dispersing the above-described hot rolled oil composition for aluminum in water by a commonly used method. The density | concentration of the hot rolling oil composition for aluminum in rolling oil is 3-8 wt% normally, and 4-6 wt% is preferable. The average particle size of the emulsion of the present invention (average particle size of oil droplets in the emulsion) is usually 2 to 10 μm, but preferably 5 to 7 μm. If it is less than 2 μm, the emulsification stability is excellent, but the scum out property is deteriorated. If it exceeds 10 μm, the average particle size of the emulsion becomes too large and the emulsion stability becomes extremely poor. In addition, the particle size distribution of the emulsion (distribution of the particle size of oil droplets in the emulsion) is usually 80% of the total oil droplets in the range of 1 to 20 μm, preferably 5 to 7 μm. When many particles of less than 2 μm are contained, the scum out property is deteriorated. When many particles exceeding 10 μm are contained, the emulsion stability deteriorates.
[0007]
This invention has the outstanding effect | action described below by containing a triethanolamine, surfactant, and a fatty acid with the said composition with respect to at least 1 sort (s) chosen from refined mineral oil, refined fats and oils, and synthetic oil. is there.
(1) Immediately after preparation as an emulsion-type rolling oil, an appropriate average particle size and particle size distribution of the emulsion are shown, the rolling process is efficiently stabilized, and stable operation is possible.
(2) Since the emulsion can be loosened and has excellent scum-out properties, accumulation of dirt such as wear powder in the rolling oil can be suppressed.
(3) Excessive particle size growth can be suppressed, and a loose emulsion can be stably maintained for a long time even at high temperatures.
(4) Since the emulsion can be held loosely and stably, in addition to obtaining an excellent surface quality of the product, a stable rolling process independent of the emulsion properties is performed, and a stable operation can be performed.
(5) The processing when the emulsion-type rolling oil becomes waste liquid becomes easy.
[0008]
【Example】
EXAMPLES Next, although this invention is demonstrated based on an Example, this invention is not limited to a following example.
The test was conducted using the large-scale circulation tester shown in FIG. In FIG. 1, 1 is a rolling mill equipped with a large circulation tester, 2 is a return pit, 3 is a return pump, 4 is a belt skimmer, 5 is a drum skimmer, 6 is a dirty tank, 7 is a filter pump, 8 is a filter, 9 is a clean tank and 10 is a supply pump.
The emulsion was prepared by adding a small amount of the hot rolling oil composition for aluminum shown in Table 1 to pure water heated to 60 ° C. to the clean tank 9 in FIG. Then, the spray oil was sprayed from the spray nozzle 11 through the return pump 3, the filter pump 7 and the supply pump 10 to give a strong stirring force to the emulsion, and the rolling oil was circulated (spray circulation). Then, spray circulation was sufficiently performed until the average particle size of the formed emulsion did not change. The oil concentration of the emulsion (concentration of the rolling oil composition) was adjusted to 5 wt%.
Next, the rolling mill 1 was operated, and using the above testing machine, one kind of emulsion-type rolling oil was subjected to circulation and hot rolling for 8 hours a day, and this was continued for 6 months. Hot rolling was performed at 450 ° C.
During hot rolling, each emulsion is applied with high shear stress by spraying the three pumps of the return pump 3, the filter pump 7 and the supply pump 10 shown in FIG. Here, the supply pump 10 is operated at a discharge rate of 80 m 3 / h. In addition, the abrasion powder generated by rolling is not removed by the filter 8 for the scum-out property test (filter paper is removed), and only those that float with the separated oil are installed in the dirty tank 6. The belt skimmer 4 and the drum skimmer 5 were discharged from the system. As the aluminum plate, a pure aluminum material (rolling ratio 50%) was used.
[0009]
[Table 1]
[0010]
Thus, after 6 months of circulation, an emulsion sample is taken from the middle layer of the clean tank 9, and the emulsion stability, degree of rolling oil contamination, and lubricity are tested by the following methods, and the rolled aluminum plate Was tested for surface quality.
(Emulsification stability)
(1) 100 ml of each emulsion sample was collected in a colorimetric tube, and after standing for a whole day, the state of separation was examined by the amount of free oil, scum and cream.
{Circle around (2)} Each 100 ml of the emulsion sample was collected in a colorimetric tube and subjected to a separation operation at 1500 ± 200 rpm for 20 minutes with a centrifuge, and the amounts of free oil, scum and cream were examined.
(Rolling oil stain degree)
The emulsion was dehydrated and the remaining oil (including dirt) was pre-ashed in an electric furnace and then completely incinerated for 2 hours in a 775 ° C. muffle furnace. The residue was evaluated as “ash”. did.
(Lubricity)
(1) The magnitude of the rolling load detected from the load cell, and (2) the friction coefficient determined by calculation from the rolling load and the advanced rate.
A: Friction coefficient 0.08 or less, B: Friction coefficient 0.1-0.2, X: Friction coefficient 0.3 or more (aluminum plate surface quality)
(1) Anodized (anodized), observed with a microscope, and (2) evaluated by the gloss of the base plate.
○: Less than pickup score 2, ×: Pickup score 2 or more (measurement of average particle diameter of emulsion)
The emulsion was diluted 10,000 times with physiological saline and measured with a Coulter counter.
(Measurement of emulsion particle size distribution)
The emulsion was diluted 10,000 times with physiological saline and measured with a Coulter counter.
The test results and evaluation are shown in Table 2.
[0011]
[Table 2]
[0012]
From the results shown in Table 2, the following can be understood.
(1) Although oil agent A has excellent emulsification stability, oil separation does not occur, so that wear powder does not float in the rolling oil, and the accumulation of wear powder in the rolling oil is intense. In addition, since the average particle size of the emulsion is small, the lubricity is poor, the quality of the surface of the aluminum sheet after rolling is poor, and seizure occurs when the rolling speed is increased.
(2) Oil agent B is in an incompletely emulsified state and has a very poor emulsification stability. However, since the separated oil floats violently, the scum out property is good and the accumulation of dirt is small. However, since the emulsification stability is poor, the oil content of the rolling oil that has been introduced floats immediately after replenishment to the testing machine, and it is difficult to maintain the oil concentration, and the oil cannot be circulated. The lubricity is good if the oil concentration is kept constant by continuously supplying a large amount of rolling oil. However, the surface properties of the plate lack uniformity, and it cannot be said that the quality is good.
(3) Oil C has a low amount of triethanolamine and, in addition, a very high amount of fatty acid, so the emulsion stability is poor. Furthermore, because of excessive lubrication, the plate biting property during rolling is extremely poor. However, since the separation oil floats up, the scum out property is good and the accumulation of dirt is small.
(4) Although the oil agent D has good emulsion stability, since the emulsion particle size is small, the lubricity and surface quality are not good. Furthermore, since there is little oil floating, accumulation of dirt is large, and in addition, waste oil treatment is poor.
(5) Oil E has relatively good emulsification stability, but is less likely to cause oil separation and has less oil floating, so that there is a lot of accumulation of dirt. Furthermore, since the emulsion particle size is small, the lubricity is not good.
(6) The oils F to H of the present invention have a stable emulsion particle size in the range of 5 to 8 μm immediately after the preparation of the emulsion and after 6 months, and have good emulsification stability and scum out. It has good properties and there is little accumulation of dirt in the rolling oil. Further, the lubricity was excellent and the quality of the aluminum plate surface was also good. Furthermore, the waste oil processing property was also excellent.
[0013]
【The invention's effect】
The emulsion obtained from the hot rolling oil composition for aluminum according to the present invention is capable of making the emulsion loose while maintaining the emulsion stability, and is equipped with a circulation system to which a high shear stress is added to the rolling process. Therefore, it is possible to operate stably for a long time without partial or total oil renewal. Also, according to such hot rolled oil for emulsion type aluminum, both excellent scum out property and emulsification stability are achieved, the lubricity that is a function of the rolled oil is good, and the rolled aluminum plate has excellent surface quality. Can be provided.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram of a large circulation tester.
Claims (2)
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JP15170698A JP3973759B2 (en) | 1998-06-01 | 1998-06-01 | Hot rolling oil composition for aluminum and hot rolling oil for emulsion type aluminum |
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JP15170698A JP3973759B2 (en) | 1998-06-01 | 1998-06-01 | Hot rolling oil composition for aluminum and hot rolling oil for emulsion type aluminum |
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