DE3923283A1 - NITRITE-FREE AQUEOUS WET DRESSING AGENTS - Google Patents

NITRITE-FREE AQUEOUS WET DRESSING AGENTS

Info

Publication number
DE3923283A1
DE3923283A1 DE3923283A DE3923283A DE3923283A1 DE 3923283 A1 DE3923283 A1 DE 3923283A1 DE 3923283 A DE3923283 A DE 3923283A DE 3923283 A DE3923283 A DE 3923283A DE 3923283 A1 DE3923283 A1 DE 3923283A1
Authority
DE
Germany
Prior art keywords
acid
weight
wet dressing
dressing agent
agent according
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
DE3923283A
Other languages
German (de)
Inventor
Armin Friesendorf
Josef Dipl Chem Dr Kresse
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Henkel AG and Co KGaA
Original Assignee
Henkel AG and Co KGaA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Henkel AG and Co KGaA filed Critical Henkel AG and Co KGaA
Priority to DE3923283A priority Critical patent/DE3923283A1/en
Priority to AU60410/90A priority patent/AU6041090A/en
Priority to PCT/EP1990/001083 priority patent/WO1991001363A1/en
Priority to NZ234465A priority patent/NZ234465A/en
Priority to PL28604290A priority patent/PL286042A1/en
Priority to ZA905525A priority patent/ZA905525B/en
Priority to AR90317362A priority patent/AR246763A1/en
Priority to CN90104601A priority patent/CN1048723A/en
Publication of DE3923283A1 publication Critical patent/DE3923283A1/en
Withdrawn legal-status Critical Current

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    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
    • C23F11/00—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent
    • C23F11/08—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent in other liquids
    • C23F11/10—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent in other liquids using organic inhibitors
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    • C10M125/00—Lubricating compositions characterised by the additive being an inorganic material
    • C10M125/26—Compounds containing silicon or boron, e.g. silica, sand
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    • C10M129/00—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing oxygen
    • C10M129/02—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing oxygen having a carbon chain of less than 30 atoms
    • C10M129/26—Carboxylic acids; Salts thereof
    • C10M129/28—Carboxylic acids; Salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms
    • C10M129/38—Carboxylic acids; Salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having 8 or more carbon atoms
    • C10M129/40—Carboxylic acids; Salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having 8 or more carbon atoms monocarboxylic
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Abstract

The invention concerns a nitrite-free wet dressing agent for preventing the contamination of rollers and corrosion of the rolled sheet, the dressing agent containing a carboxylic acid and an amine, characterized in that the nitrite-free aqueous wet dressing agent consists of at least 2-20 % by wt of a monovalent with 6-20 C-atoms or a divalent with 4-12 C-atoms aliphatic and/or aromatic and/or arylaliphatic carboxylic acid, 0-10 % by wt of boric acid, 0.1-10 % by wt of an N-acylated derivative of N-methylglycine of the general formula (I) in which R = a saturated or unsaturated C11-C19 alkyl group and M = H, Li, Na, K, ammonium or alkanolammonium, 0-5 % by wt of a water-hardness-complexing agent, 0-0.5 % by wt of a perfuming agent, an amine which forms a salt with said carboxylic acid in aqueous solution and which is added in a quantity such that the pH-value is between 8 and 11, the remainder consisting of water. The invention also concerns a process for finishing steel strip, using this aqueous wet dressing agent.

Description

Die Erfindung betrifft nitritfreie wäßrige Naßdressiermittel zur Verhinderung von Walzenverschmutzung und Korrosion des nachgewalzten (dressierten) Bleches, sowie ein Verfahren zum Nachwalzen (Dressieren) von Bandstahl unter Verwendung dieses Mittels.The invention relates to nitrite-free aqueous wet dressing agents for Prevention of roller contamination and corrosion of the re-rolled (trained) sheet metal, as well as a method for re-rolling Of steel strip using this agent.

Nach dem Kaltwalzen von Bandstahl in Gegenwart von Walzölemulsionen wird das erhaltene, in der Dicke reduzierte und walzharte Blech geglüht, um ihm wiederum eine gewisse Weichheit zu verleihen. Um diesem weichen Blech die erwünschten Verarbeitungseigenschaften zu verleihen, muß es anschließend noch nachgewalzt werden. Dieser Verfahrensschritt dient zur Erzeugung einer definierten Rauheit auf der Blechoberfläche, der Verbesserung der Planheit und der Unterdrückung der Bildung von Fließfiguren bei der Lagerung.After cold rolling steel strip in the presence of rolling oil emulsions the thickness obtained is reduced and hard as rolled Annealed sheet metal to give it a certain softness. The desired processing properties around this soft sheet to lend, it must then be re-rolled. This process step serves to generate a defined one Roughness on the sheet surface, improving the Flatness and the suppression of the formation of flow figures of storage.

Das dabei eingesetzte Naßdressiermittel soll Schmutzablagerungen auf den Walzen, die sogenannte zulaufende Mattierung, verhindern und für eine gewisse Schmierung sorgen. Eine weitere wesentliche Forderung ist, daß die in das Band beim Aufrollen eingewickelte noch vorhandene wäßrige Lösung keine Korrosion oder Verfärbung des Bleches verursacht.The wet dressing agent used is intended to deposit dirt prevent the so-called tapering on the rollers and provide some lubrication. Another essential  The requirement is that the wrapped in the tape when rolled up still existing aqueous solution no corrosion or discoloration of the sheet.

Bisher verwendete Naßdressiermittel enthalten meist anorganisches Nitrit, vielfach in Kombination mit Alkanolaminen, wie z. B. Mono-, Di- oder Triethanolamin.Wet dressing agents used up to now mostly contain inorganic Nitrite, often in combination with alkanolamines, such as e.g. B. mono-, di- or triethanolamine.

WO 81/00 579 beschreibt ein Gemisch aus anorganischem Nitrit, dem Natriumsalz der Benzoesäure, Natriumcarbonat und gegebenenfalls einem Glykol. Die korrosionsinhibierende Wirkung wird hierbei im wesentlichen dem Natriumnitrit zugeschrieben.WO 81/00 579 describes a mixture of inorganic nitrite, the Sodium salt of benzoic acid, sodium carbonate and optionally a glycol. The corrosion-inhibiting effect is here essentially attributed to sodium nitrite.

JP-1 09 780 beschreibt ein Naßdressiermittel aus einer substituierten Benzoesäure, einem primären Amin und einer Carbonsäure.JP-1 09 780 describes a wet dressing agent made from a substituted one Benzoic acid, a primary amine and a carboxylic acid.

Aus JP-0 46 719 ist ein Alkanolamin enthaltendes Gemisch bekannt, welches kein Natriumnitrit enthält.A mixture containing alkanolamine is known from JP-0 46 719, which does not contain sodium nitrite.

Ebenfalls nitritfrei ist das Naßdressiermittel, welches in JP 57 151 700 beschrieben wird. Wesentlicher Bestandteil ist hier ein Partialester oder Salz einer Dicarbonsäure mit einem oxyalkylierten Amin.The wet dressing agent, which is described in JP 57 151 700 is described. An essential part is here a partial ester or salt of a dicarboxylic acid with an oxyalkylated Amine.

Es handelt sich also um nitrithaltige, dafür aminfreie oder nitritfreie, dafür aminhaltige Mischungen, wobei letztere häufig aus Alkanolamin-Salzen von aromatischen oder aliphatischen Mono- und Dicarbonsäuren und deren Derivaten bestehen.So it is nitrite-containing, but amine-free or nitrite-free, but amine-containing mixtures, the latter often from alkanolamine salts of aromatic or aliphatic mono- and dicarboxylic acids and their derivatives.

Aus Gründen des Umweltschutzes und der Arbeitshygiene sind nitrithaltige Mittel unerwünscht. Besonders kritisch sind hierbei jedoch Kombinationen von Nitrit und Aminen durch die Gefahr der Nitrosaminbildung. Da die Naßdressiermittel zur Anwendung auf das Blech aufgesprüht werden, wobei sie sich in der das Walzgerüst umgebenden Luft in Form eines feinen Nebels verteilen (Aerosolbildung), können sie durch das Betriebspersonal eingeatmet werden.For reasons of environmental protection and occupational hygiene agents containing nitrite undesirable. Are particularly critical here however combinations of nitrite and amines due to the danger nitrosamine formation. Because the wet dessant to use be sprayed onto the metal sheet, which is in the Distribute the surrounding air in the form of a fine mist  (Aerosol formation), they can be inhaled by the operating personnel will.

Die nitritfreien Lösungen sind dagegen nicht in der Lage, bei naß aufgewickelten Bändern einen ausreichenden Korrosionsschutz zu gewährleisten.The nitrite-free solutions, however, are not able to Adequate corrosion protection is provided on wet wound tapes to guarantee.

Aus den beschriebenen Umständen ergibt sich die Aufgabe, ein nitritfreies Naßdressiermittel bereitzustellen, welches hinsichtlich seiner korrosionsinhibierenden Wirkung bei der Lagerung von Bandstahl den nitrithaltigen Gemischen nicht nachsteht. Gleichzeitig soll die Walze von Verunreinigungen oder Ablagerungen freigehalten werden. Die erhaltenen Gemische sollen zudem physiologisch unbedenklich und zur Anwendung in einem Verfahren zum Nachwalzen von Bandstahl geeignet sein.The task arises from the circumstances described to provide nitrite-free wet dressing which, with regard to its corrosion-inhibiting effect during storage of strip steel is not inferior to the nitrite-containing mixtures. At the same time, the roller should avoid contamination or deposits be kept free. The mixtures obtained should also physiologically harmless and for use in one process be suitable for rolling steel strip.

Die Aufgabe wird erfindungsgemäß gelöst durch ein nitritfreies wäßriges Naßdressiermittel zur Verhinderung von Walzenverschmutzung und Korrosion des nachgewalzten Bleches, das eine Carbonsäure und ein Amin enthält, und das dadurch gekennzeichnet ist, daß das nitritfreie wäßrige Naßdressiermittel aus
2 bis 20 Gew.-% mindestens einer 6 bis 20 C-Atome enthaltenden einwertigen oder einer 4 bis 12 C-Atome enthaltenden zweiwertigen aliphatischen und/ oder aromatischen und/oder arylaliphatischen Carbonsäure,
0 bis 10 Gew.-% Borsäure,
0,1 bis 10 Gew.-% eines N-acylierten Derivates von N-Methylglycin der allgemeinen FormelThe object is achieved by a nitrite-free aqueous wet dressing agent to prevent roller contamination and corrosion of the re-rolled sheet, which contains a carboxylic acid and an amine, and which is characterized in that the nitrite-free aqueous wet dressing agent
2 to 20% by weight of at least one monovalent aliphatic and / or aromatic and / or arylaliphatic carboxylic acid containing 6 to 20 C atoms or one divalent 4 to 12 C atoms,
0 to 10% by weight boric acid,
0.1 to 10 wt .-% of an N-acylated derivative of N-methylglycine of the general formula

mit
R = gesättigt oder ungesättigt C₁₁-C₁₉-Alkyl und
M = H, Li, Na, K, Ammonium oder Alkanolammonium,
0 bis 5 Gew.-% eines Wasserhärte-komplexierenden Mittels,
0 bis 0,5 Gew.-% eines Parfüms,
einem Amin, das mit den genannten Carbonsäuren in wäßriger Lösung ein Salz bildet und das in einer solchen Menge zugesetzt wird, daß der pH-Wert zwischen 8 und 11 beträgt und als Rest aus Wasser besteht.With
R = saturated or unsaturated C₁₁-C₁₉ alkyl and
M = H, Li, Na, K, ammonium or alkanolammonium,
0 to 5% by weight of a water hardness complexing agent,
0 to 0.5% by weight of a perfume,
an amine which forms a salt with the aforementioned carboxylic acids in aqueous solution and which is added in such an amount that the pH is between 8 and 11 and the remainder consists of water.

Besonders geeignet sind Mono- und/oder Dicarbonsäuren mit einer Anzahl von Kohlenstoffatomen zwischen 8 und 12, wobei insbesondere Gemische einer Mono- und Dicarbonsäure im Verhältnis 1 : 10 bis 10 : 1 eingesetzt werden können.Mono- and / or dicarboxylic acids with a Number of carbon atoms between 8 and 12, in particular Mixtures of a mono- and dicarboxylic acid in a ratio of 1:10 up to 10: 1 can be used.

Typische Vertreter der Monocarbonsäuren sind 2-Ethylhexansäure, Laurinsäure, Isooctansäure, Benzoesäure, 3-Nitrobenzoesäure, 3-Aminobenzoesäure, p-tert.-Butylbenzoesäure, Zimtsäure und insbesondere Isononansäure.Typical representatives of the monocarboxylic acids are 2-ethylhexanoic acid, Lauric acid, isooctanoic acid, benzoic acid, 3-nitrobenzoic acid, 3-aminobenzoic acid, p-tert-butylbenzoic acid, cinnamic acid and in particular Isononanoic acid.

Vertreter für Dicarbonsäuren sind Adipinsäure, Azelainsäure, Isosebazinsäure, Phthalsäure, Isophthalsäure, Terephthalsäure und insbesondere Sebazinsäure.Representatives of dicarboxylic acids are adipic acid, azelaic acid, Isosebacic acid, phthalic acid, isophthalic acid, terephthalic acid and especially sebacic acid.

Borsäure, die als Konservierungsmittel zugesetzt werden kann, wird vorzugsweise in einer Menge von 0,5 bis 5 Gew.-% eingesetzt.Boric acid, which can be added as a preservative, is preferably used in an amount of 0.5 to 5 wt .-%.

Bevorzugte Derivate des N-acylierten N-Methyl-glycins (N-Acylsarkosin) sind Oleoyl-N-methylglycin (Sarkosyl O®, Ciba Geigy) oder Lauroyl-N-methylglycin (Sarkosyl L®, Ciba Geigy), deren Wirkung als temporäre Korrosionsschutzmittel bekannt ist. Neben der freien Säure können auch die durch Neutralisation mit Lithium-, Natrium- oder Kaliumhydroxiden, Aminen oder Alkanolaminen erhaltenen Salze eingesetzt werden.Preferred derivatives of N-acylated N-methylglycine (N-acylsarcosine) are oleoyl-N-methylglycine (Sarkosyl O®, Ciba Geigy) or lauroyl-N-methylglycine (Sarkosyl L®, Ciba Geigy), their  Effect is known as a temporary anti-corrosion agent. Next the free acid can also be obtained by neutralization with lithium, Sodium or potassium hydroxides, amines or alkanolamines obtained salts are used.

Zur Komplexierung der Wasserhärte kann erfindungsgemäß das Natrium- oder Kaliumligninsulfonat Verwendung finden. Es können aber auch andere übliche Substanzen zur Komplexierung der Wasserhärte Verwendung finden, beispielsweise die hierfür bekannten Phosphonsäuren, wie 2-Hydroxyethan-1,1-diphosphonsäure (HEDP), 2-Phosphonobutan-1,2,4-tricarbonsäure (PBS) oder Ethylendiamintetra (methylenphosphonsäure) (EDTP). Solche Verbindungen werden vorzugsweise in einer Menge von 0,1 bis 2 Gew.-% eingesetzt.To complex the water hardness, the sodium or potassium lignin sulfonate are used. It can but also other common substances for complexing the water hardness Find use, for example those known for this Phosphonic acids, such as 2-hydroxyethane-1,1-diphosphonic acid (HEDP), 2-phosphonobutane-1,2,4-tricarboxylic acid (PBS) or ethylenediaminetetra (methylenephosphonic acid) (EDTP). Such connections will be preferably used in an amount of 0.1 to 2 wt .-%.

Zur Vermeidung eines eventuell auftretenden unangenehmen Geruchs kann dem Naßdressiermittel ein Parfüm zugegeben werden, vorzugsweise in einer Menge von 0,1 Gew.-%.To avoid a possible unpleasant smell a perfume can be added to the wet dressing agent, preferably in an amount of 0.1% by weight.

Die Zugabe des Amins erfolgt zur Neutralisation der eingesetzten Carbonsäuren. Die durch Zusatz des Amins alkalisierte Lösung hat erfindungsgemäß vorzugsweise einen pH-Wert von 9 bis 10.The amine is added to neutralize the ones used Carboxylic acids. Has the solution alkalized by adding the amine according to the invention preferably a pH of 9 to 10.

Als Amin werden vorzugsweise Gemische aus Di- oder Trialkanolaminen, insbesondere Di- und Triethanolamin eingesetzt. Das Verhältnis von Di- zu Triethanolamin beträgt dabei zwischen 1 : 5 und 5 : 1, vorzugsweise zwischen 2 : 1 und 1 : 2. In der Regel ergibt ein Verhältnis von 1 : 1 eine optimale Mischung.Mixtures of di- or trialkanolamines, especially di- and triethanolamine used. The relationship from di to triethanolamine is between 1: 5 and 5: 1, preferably between 2: 1 and 1: 2. Usually a ratio of 1: 1 gives an optimal mix.

Eine typische Zusammensetzung für ein Naßdressiermittel besteht erfindungsgemäß aus 8 bis 15 Gew.-% einer Mono- und/oder Dicarbonsäure, 0 bis 5 Gew.-% Borsäure, 1 bis 5 Gew.-% Oleoyl-N-methylglycin (Sarkosyl O®), 0 bis 2 Gew.-% Natrium- oder Kaliumligninsulfonat, 0 bis 0,1 Gew.-% Parfüm, 15 bis 40 Gew.-% eines Gemisches aus Di- und Trialkanolamin im Verhältnis von 2 : 1 bis 1 : 1 und als Rest aus Wasser. A typical composition for a wet dressing agent is according to the invention from 8 to 15% by weight of a mono- and / or dicarboxylic acid, 0 to 5% by weight boric acid, 1 to 5% by weight oleoyl-N-methylglycine (Sarkosyl O®), 0 to 2% by weight sodium or potassium lignin sulfonate, 0 to 0.1% by weight of perfume, 15 to 40% by weight of one Mixture of di- and trialkanolamine in a ratio of 2: 1 to 1: 1 and the rest from water.  

Die Erfindung betrifft weiterhin ein Verfahren zum Nachwalzen von Bandstahl unter Verwendung des erfindungsgemäßen Naßdressiermittels, welches, bevor das Band in den Walzspalt eintritt, auf die Oberfläche dieses Bandes aufgetragen und in einer Anwendungskonzentration von 1 bis 10 Gew.-% eingesetzt wird. Vorzugsweise wird auf eine Anwendungskonzentration von 3 bis 8 Gew.-%, insbesondere 5 Gew.-%, verdünnt.The invention further relates to a method for rerolling of strip steel using the wet dressing agent according to the invention, which, before the strip enters the nip, applied to the surface of this tape and in a Application concentration of 1 to 10 wt .-% is used. Preferably an application concentration of 3 to 8% by weight, in particular 5% by weight, diluted.

Zur Prüfung des Korrosionsschutzes der erfindungsgemäßen Naßdressiermittel im Labor wurden trockendressierte Feinbleche (Typ R, Dicke 0,8 mm, 3 × 5 inch, ASTM D 609.1B, The Q-Panel Company, Cleveland, Ohio) mit definierten, unbehandelten Oberflächen in eine 5 gew.-%ige Behandlungslösung getaucht, welche durch Verdünnung des Konzentrats mit einem Gemisch aus vollentsalztem Wasser und Trinkwasser im Verhältnis 90 : 10 erhalten wurde. Dann wurden jeweils zwei dieser Bleche zusammengepreßt und naß in handelsübliche Aluminiumfolie eingewickelt und bei Raumtemperatur gelagert. Nach jeweils 1, 2, 3, 4 und 5 Wochen wurden die Innenseiten der Bleche auf Korrosion und Verfärbung geprüft.To test the corrosion protection of the wet dressing agents according to the invention In the laboratory, dry-addressed thin sheets (type R, thickness 0.8mm, 3x5 inch, ASTM D 609.1B, The Q-Panel Company, Cleveland, Ohio) with defined, untreated surfaces in a 5 wt .-% treatment solution dipped by dilution of the concentrate with a mixture of fully desalinated Water and drinking water in a ratio of 90:10 was obtained. Then two of these sheets were pressed together and wet wrapped in commercially available aluminum foil and at room temperature stored. After 1, 2, 3, 4 and 5 weeks, respectively the inside of the sheets checked for corrosion and discoloration.

Zur Prüfung des Korrosionsschutzes und der verschmutzungsverhindernden Wirkung der erfindungsgemäßen Naßdressiermittel unter praktischen Betriebsbedingungen wurden die Lösungen mittels Spritzdüsen vor dem Walzspalt aufgetragen, die Bänder naß aufgewickelt und nach mehrtägiger bis mehrwöchiger Zwischenlagerung auf den Zustand der Oberfläche hin betrachtet.For checking the corrosion protection and pollution prevention Effect of the wet dressing agents according to the invention The solutions were created using practical operating conditions Spray nozzles applied in front of the roll gap, the strips wound up wet and after intermediate storage lasting several days to several weeks looking at the condition of the surface.

Während des Betriebs wurde das Ausmaß der Verunreinigung der Walzen begutachtet. In allen Fällen war das in Gegenwart des erfindungsgemäßen Naßdressiermittels gewalzte Bandmaterial nach der angegebenen Zeit in optisch einwandfreiem Zustand, zeigte also keine Korrosion und keine Verfärbung. Die Oberflächen der Walzen wiesen keine feststellbaren Verunreinigungen auf.During operation, the level of contamination of the Rolls examined. In all cases it was in the presence of the wet material according to the invention after rolled strip material the specified time in optically perfect condition so no corrosion and no discoloration. The surfaces of the Rollers showed no detectable contamination.

Die Erfindung wird durch die folgenden Beispiele erläutert.The invention is illustrated by the following examples.

BeispieleExamples

Konzentratmischungen 1 bis 3 beziehen sich auf handelsübliche Naßdressiermittel, welche zum Vergleich mit aufgeführt wurden. Beispiele 4 bis 8 betreffen die erfindungsgemäßen Konzentrate, wobei Beispiel 8 als Betriebsversuch durchgeführt wurde, bei dem die Mischung in der angegebenen Konzentration im Dressiergerüst vor dem Walzspalt auf das Feinband gesprüht wurde. Sofort nach dem Dressieren wurde das Feinband naß aufgewickelt. Die Prüfung des Bandstahls auf optisch einwandfreiem Zustand erfolgte jeweils nach 2 Tagen bzw. 2 Wochen bzw. 4 Wochen.Concentrate mixtures 1 to 3 refer to commercially available Wet dressing agents that were listed for comparison. Examples 4 to 8 relate to the concentrates according to the invention, Example 8 was carried out as an operational test in which the mixture in the specified concentration in the skin pass mill was sprayed onto the fine strip before the roll gap. Immediately after The fine tape was wound up wet with skin pass. The exam the steel strip was in a visually perfect condition after 2 days or 2 weeks or 4 weeks.

Die Bewertung der Korrosion in den Laborversuchen (Stapeltest) erfolgte dabei nach folgender Einstufung:
0 = rost- und verfärbungsfrei,
1 = geringe Verfärbung,
2 = ca. 10% Flächenrost,
3 = ca. 40 bis 50% Flächenrost und
4 = 80 bis 100% Flächenrost. The corrosion in the laboratory tests (batch test) was rated according to the following classification:
0 = rust and discoloration free,
1 = slight discoloration,
2 = approx. 10% surface rust,
3 = approx. 40 to 50% surface rust and
4 = 80 to 100% surface rust.

Tabelle table

Claims (15)

1. Nitritfreies wäßriges Naßdressiermittel zur Verhinderung von Walzenverschmutzung und Korrosion des nachgewalzten Bleches, enthaltend eine Carbonsäure und ein Amin, dadurch gekennzeichnet, daß das nitritfreie wäßrige Naßdressiermittel aus
2 bis 20 Gew.-% mindestens einer 6 bis 20 C-Atome enthaltenden einwertigen oder einer 4 bis 12 C-Atome enthaltenden zweiwertigen aliphatischen und/ oder aromatischen und/oder arylaliphatischen Carbonsäure,
0 bis 10 Gew.-% Borsäure,
0,1 bis 10 Gew.-% eines N-acylierten Derivates von N-Methylglycin der allgemeinen Formel mit
R = gesättigt oder ungesättigt C₁₁-C₁₉-Alkyl und
M = H, Li, Na, K, Ammonium oder Alkanolammonium,
0 bis 5 Gew.-% eines Wasserhärte-komplexierenden Mittels,
0 bis 0,5 Gew.-% eines Parfüms,
einem Amin, das mit den genannten Carbonsäuren in wäßriger Lösung ein Salz bildet und das in einer solchen Menge zugesetzt wird, daß der pH-Wert zwischen 8 und 11 beträgt und als Rest aus Wasser besteht. 1. Nitrite-free aqueous Naßdressiermittel to prevent roller contamination and corrosion of the temper rolled sheet containing a carboxylic acid and an amine, characterized in that the nitrite-free aqueous Naßdressiermittel from
2 to 20% by weight of at least one monovalent aliphatic and / or aromatic and / or arylaliphatic carboxylic acid containing 6 to 20 C atoms or one divalent 4 to 12 C atoms,
0 to 10% by weight boric acid,
0.1 to 10% by weight of an N-acylated derivative of N-methylglycine of the general formula With
R = saturated or unsaturated C₁₁-C₁₉ alkyl and
M = H, Li, Na, K, ammonium or alkanolammonium,
0 to 5% by weight of a water hardness complexing agent,
0 to 0.5% by weight of a perfume,
an amine which forms a salt with the carboxylic acids mentioned in aqueous solution and which is added in such an amount that the pH is between 8 and 11 and the remainder consists of water. 2. Naßdressiermittel nach Anspruch 1, dadurch gekennzeichnet, daß die Anzahl der Kohlenstoffatome in der Mono- und/oder Dicarbonsäure 8 bis 12 beträgt.2. Wet dressing agent according to claim 1, characterized in that that the number of carbon atoms in the mono- and / or dicarboxylic acid Is 8 to 12. 3. Naßdressiermittel nach Ansprüchen 1 und 2, dadurch gekennzeichnet, daß ein Gemisch einer Mono- und Dicarbonsäure im Verhältnis 1 : 10 bis 10 : 1 eingesetzt wird.3. wet dressing agent according to claims 1 and 2, characterized in that a mixture of a mono- and dicarboxylic acid in the ratio 1:10 to 10: 1 is used. 4. Naßdressiermittel nach Ansprüchen 1 bis 3, dadurch gekennzeichnet, daß als Monocarbonsäure 2-Ethylhexansäure, Laurinsäure, Isooctansäure, Benzoesäure, 3-Nitrobenzoesäure, 3-Aminobenzoesäure, p-tert.-Butylbenzoesäure, Zimtsäure und insbesondere Isononansäure eingesetzt wird.4. wet dressing agent according to claims 1 to 3, characterized in that as monocarboxylic acid 2-ethylhexanoic acid, lauric acid, Isooctanoic acid, benzoic acid, 3-nitrobenzoic acid, 3-aminobenzoic acid, p-tert-butylbenzoic acid, cinnamic acid and in particular Isononanoic acid is used. 5. Naßdressiermittel nach Ansprüchen 1 bis 3, dadurch gekennzeichnet, daß als Dicarbonsäure Adipinsäure, Azelainsäure, Isosebazinsäure, Phthalsäure, Isophthalsäure, Terephthalsäure und insbesondere Sebazinsäure eingesetzt wird.5. wet dressing agent according to claims 1 to 3, characterized in that as dicarboxylic acid adipic acid, azelaic acid, isosebacic acid, Phthalic acid, isophthalic acid, terephthalic acid and in particular sebacic acid is used. 6. Naßdressiermittel nach Ansprüchen 1 bis 5, dadurch gekennzeichnet, daß die Menge an Borsäure 0,5 bis 5 Gew.-% beträgt.6. wet dressing agent according to claims 1 to 5, characterized in that the amount of boric acid is 0.5 to 5 wt .-%. 7. Naßdressiermittel nach Ansprüchen 1 bis 6, dadurch gekennzeichnet, daß als N-acyliertes Derivat von N-Methylglycin Oleoyl-N-methylglycin oder Lauroyl-N-methylglycin oder das Salz davon eingesetzt wird.7. wet dressing agent according to claims 1 to 6, characterized in that as an N-acylated derivative of N-methylglycine Oleoyl-N-methylglycine or lauroyl-N-methylglycine or the salt of which is used. 8. Naßdressiermittel nach Ansprüchen 1 bis 7, dadurch gekennzeichnet, daß als Wasserhärte-komplexierendes Mittel 2-Hydroxyethan- 1,1-diphosphonsäure, 2-Phosphonobutan-1,2,4-tricarbonsäure, Ethylendiamintetra(methylenphosphonsäure) und insbesondere Natrium- oder Kaliumligninsulfonat eingesetzt wird.8. wet dressing agent according to claims 1 to 7, characterized in that as a water hardness complexing agent 2-hydroxyethane 1,1-diphosphonic acid, 2-phosphonobutane-1,2,4-tricarboxylic acid, Ethylenediaminetetra (methylenephosphonic acid) and in particular Sodium or potassium lignin sulfonate is used. 9. Naßdressiermittel nach Ansprüchen 1 bis 8, dadurch gekennzeichnet, daß die Menge des Parfüms 0,1 Gew.-% beträgt. 9. wet dressing agent according to claims 1 to 8, characterized in that the amount of the perfume is 0.1% by weight.   10. Naßdressiermittel nach Ansprüchen 1 bis 9, dadurch gekennzeichnet, daß das Amin in einer solchen Menge zugesetzt wird, daß der pH-Wert der Lösung 9 bis 10 beträgt.10. wet dressing agent according to claims 1 to 9, characterized in that the amine is added in such an amount that the pH of the solution is 9 to 10. 11. Naßdressiermittel nach Ansprüchen 1 bis 10, dadurch gekennzeichnet, daß als Amin ein Gemisch aus Di- und Trialkanolamin, insbesondere Di- und Triethanolamin, im Verhältnis von 1 : 5 bis 5 : 1, vorzugsweise von 2 : 1 bis 1 : 2 eingesetzt wird.11. Wet dressing agent according to claims 1 to 10, characterized in that as amine a mixture of di- and trialkanolamine, especially di- and triethanolamine, in a ratio of 1: 5 to 5: 1, preferably from 2: 1 to 1: 2 is used. 12. Naßdressiermittel nach Ansprüchen 1 bis 11, dadurch gekennzeichnet, daß als Amin ein Gemisch aus Di- und Trialkanolamin im Verhältnis von 1 : 1 eingesetzt wird.12. Wet dressing agent according to claims 1 to 11, characterized in that as an amine a mixture of di- and trialkanolamine in Ratio of 1: 1 is used. 13. Naßdressiermittel nach Ansprüchen 1 bis 12, dadurch gekennzeichnet, daß es aus
 8 bis 15 Gew.-% einer Mono- und/oder Dicarbonsäure,
 0 bis  5 Gew.-% Borsäure,
 1 bis  5 Gew.-% Oleoyl-N-methylglycin,
 0 bis  2 Gew.-% Natrium- oder Kaliumligninsulfonat,
 0 bis  0,1 Gew.-% Parfüm,
15 bis 40 Gew.-% eines Gemisches aus Di- und Trialkanolamin im Verhältnis von 2 : 1 bis 1 : 1 und als Rest Wasser besteht.13. Wet dressing agent according to claims 1 to 12, characterized in that it consists of
8 to 15% by weight of a mono- and / or dicarboxylic acid,
0 to 5% by weight boric acid,
1 to 5% by weight of oleoyl-N-methylglycine,
0 to 2% by weight of sodium or potassium lignin sulfonate,
0 to 0.1% by weight of perfume,
15 to 40 wt .-% of a mixture of di- and trialkanolamine in a ratio of 2: 1 to 1: 1 and the rest is water. 14. Verfahren zum Nachwalzen von Bandstahl unter Verwendung eines wäßrigen Naßdressiermittels, welches, bevor das Band in den Walzspalt eintritt, auf die Oberfläche dieses Bandes aufgetragen wird, dadurch gekennzeichnet, daß dieses Mittel aus
2 bis 20 Gew.-% mindestens einer 6 bis 20 C-Atome enthaltenden einwertigen oder einer 4 bis 12 C- Atome enthaltenden zweiwertigen aliphatischen und/oder aromatischen und/oder arylaliphatischen Carbonsäure,
0 bis 10 Gew.-% Borsäure,
0,1 bis 10 Gew.-% eines N-acylierten Derivates von N-Methylglycin der allgemeinen Formel mit
R = gesättigt oder ungesättigt C₁₁-C₁₉-Alkyl und
M = H, Li, Na, K, Ammonium oder Alkanolammonium,
0 bis 5 Gew.-% eines Wasserhärte-komplexierenden Mittels,
0 bis 0,5 Gew.-% eines Parfüms, sowie
einem Amin, das mit den genannten Carbonsäuren in wäßriger Lösung ein Salz bildet und das in einer solchen Menge zugesetzt wird, daß der pH-Wert zwischen 8 und 11 beträgt und als Rest aus Wasser besteht, in einer Anwendungskonzentration von 1 bis 10 Gew.-% verwendet wird.14. A method for re-rolling steel strip using an aqueous wet dressing agent, which is applied to the surface of this strip before the strip enters the roll gap, characterized in that this agent consists of
2 to 20% by weight of at least one monovalent aliphatic and / or aromatic and / or arylaliphatic carboxylic acid containing 6 to 20 C atoms or one divalent 4 to 12 C atoms,
0 to 10% by weight boric acid,
0.1 to 10 wt .-% of an N-acylated derivative of N-methylglycine of the general formula With
R = saturated or unsaturated C₁₁-C₁₉ alkyl and
M = H, Li, Na, K, ammonium or alkanolammonium,
0 to 5% by weight of a water hardness complexing agent,
0 to 0.5% by weight of a perfume, and
an amine which forms a salt with the carboxylic acids mentioned in aqueous solution and which is added in such an amount that the pH is between 8 and 11 and the remainder consists of water, in an application concentration of 1 to 10% by weight % is used. 15. Verfahren nach Anspruch 14, dadurch gekennzeichnet, daß die Anwendungskonzentration 3 bis 8 Gew.-%, vorzugsweise 5 Gew.-% beträgt.15. The method according to claim 14, characterized in that the Application concentration 3 to 8 wt .-%, preferably 5 wt .-% is.
DE3923283A 1989-07-14 1989-07-14 NITRITE-FREE AQUEOUS WET DRESSING AGENTS Withdrawn DE3923283A1 (en)

Priority Applications (8)

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DE3923283A DE3923283A1 (en) 1989-07-14 1989-07-14 NITRITE-FREE AQUEOUS WET DRESSING AGENTS
AU60410/90A AU6041090A (en) 1989-07-14 1990-07-05 Nitrite-free aqueous wet dressing agent
PCT/EP1990/001083 WO1991001363A1 (en) 1989-07-14 1990-07-05 Nitrite-free aqueous wet dressing agent
NZ234465A NZ234465A (en) 1989-07-14 1990-07-11 Nitrate free aqueous wet temper rolling fluid
PL28604290A PL286042A1 (en) 1989-07-14 1990-07-12 Nitride-free wet smoothening agent and a method for smooth-rolling of steel strip
ZA905525A ZA905525B (en) 1989-07-14 1990-07-13 Nitrite-free aqueous wet temper rolling fluids
AR90317362A AR246763A1 (en) 1989-07-14 1990-07-13 Nitrite-free aqueous wet dressing agent
CN90104601A CN1048723A (en) 1989-07-14 1990-07-14 The watery wet smoothing agent of no nitrite

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ZA905525B (en) 1991-03-27
AU6041090A (en) 1991-02-22
CN1048723A (en) 1991-01-23

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