EP0282921A1 - Composition de dégraissage liquide monophasé pour surfaces en aluminium ne contenant pas de phosphate - Google Patents

Composition de dégraissage liquide monophasé pour surfaces en aluminium ne contenant pas de phosphate Download PDF

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Publication number
EP0282921A1
EP0282921A1 EP88103864A EP88103864A EP0282921A1 EP 0282921 A1 EP0282921 A1 EP 0282921A1 EP 88103864 A EP88103864 A EP 88103864A EP 88103864 A EP88103864 A EP 88103864A EP 0282921 A1 EP0282921 A1 EP 0282921A1
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EP
European Patent Office
Prior art keywords
acid
degreasing
sodium
degreasing agent
alkali metal
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Application number
EP88103864A
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German (de)
English (en)
Inventor
Herbert Dr. Leiter
Dieter Dr. Brodalla
Harald Wennemann
Frantisek Dr. Jost
Andreas Buhl
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Henkel AG and Co KGaA
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Henkel AG and Co KGaA
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Publication of EP0282921A1 publication Critical patent/EP0282921A1/fr
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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
    • C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
    • C23G5/00—Cleaning or de-greasing metallic material by other methods; Apparatus for cleaning or de-greasing metallic material with organic solvents
    • C23G5/02—Cleaning or de-greasing metallic material by other methods; Apparatus for cleaning or de-greasing metallic material with organic solvents using organic solvents
    • 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
    • C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
    • C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
    • C23G1/14—Cleaning or pickling metallic material with solutions or molten salts with alkaline solutions
    • C23G1/22—Light metals

Definitions

  • the invention relates to liquid, phosphate-free single-phase compositions which can be used for the degreasing cleaning of aluminum surfaces.
  • metal surfaces which has become increasingly important in recent times to improve corrosion protection or to achieve decorative effects, requires a careful cleaning of the metal surfaces as a preparatory step before the coatings or coatings are applied.
  • Metal surfaces are usually treated with strongly alkaline cleaning solutions, with more or less complete removal of impurities, in particular fat residues, being able to be achieved.
  • builder substances are understood here to mean those compounds which are effective as buffer substances and which promote the cleaning action of surfactants.
  • borate salts such as borax, in particular, have proven themselves in the prior art for cleaning aluminum surfaces, which are used in combination with alkali metal orthophosphates or alkali metal salts of condensed phosphates and provide adequate degreasing performance without excessive amounts of metal being removed from the aluminum surface will.
  • a major disadvantage of such formulations is that the corresponding borate salts are poorly water-soluble. This leads to the fact that problems repeatedly arise in the preparation of the application solutions in that multi-phase systems are formed in the process water when the compositions, which are usually made up in powder form, are dosed.
  • the condensed phosphates commonly used as sequestering agents (complexing agents) are also gradually hydrolyzed in aqueous solution and lose their complexing properties. Which arise in the application solution or in the wastewater The phosphates are also undesirable for ecological reasons and must be successively replaced by other compounds in order to prevent eutrophication of the surface water in the long term to the extent necessary.
  • compositions which contain sodium silicate as a builder in addition to sodium carbonate are described - tailored to the application for degreasing aluminum surfaces; the compositions also contain surface-active agents and other additives known from the prior art.
  • Such compositions cannot be used in dissolved form for degreasing aluminum surfaces, since they - packaged as a powder - are introduced into the aqueous phase in a certain dosage before use.
  • a complete dissolution or homogeneous distribution of the compositions in the aqueous phase - at least on an industrial scale - is not guaranteed.
  • such compositions have the disadvantage that automatic dosing of powders is difficult; Liquid assemblies are therefore preferred in industrial applications.
  • degreasing agents for aluminum surfaces should be free of phosphate, both of which could be the absence based phosphates are to be understood as active components which are hydrolyzed in aqueous phase in compositions according to the prior art and thus lose their effectiveness, in particular their sequestering activity, and also an absence of orthophosphate in order to avoid negative ecological effects from the outset, which consist primarily in the eutrophication of surface water.
  • the degreasing agents for aluminum surfaces on which the invention is based should be accessible to automatic dosing and subsequent easy distribution in the application solution, which is most likely ensured by a liquid agent.
  • the invention relates to liquid, phosphate-free single-phase degreasing agents for aluminum surfaces with one or more builders, sequestering agents and surfactants in aqueous, alkaline solution, the alkali metal and / or ammonium carbonate, alkali metal and / or ammonium hydrogen carbonate, one or more complexing agents from the group consisting of acrylic polymers and other complexing agents, one or more anionic or nonionic surfactants, optionally further active ingredients and / or auxiliaries commonly used in such degreasing agents and water.
  • Single-phase degreasing agents for aluminum surfaces are to be understood here, as in the following description and in the patent claims, to mean degreasing agents which are not in the form of suspensions or dispersions, but rather in the form of solutions in which all components are clear, ie isotropic, are solved.
  • Sig degreasing agents have the significant advantage that they have a much higher storage stability because, when stored, especially under extreme conditions, no settling of essential components and no phase separation is observed, thus guaranteeing an essentially constant concentration of all active ingredients in the concentrates over a long period of time can be. This enables easier handling for the user when manufacturing the application fleets and also leads to a quick distribution of the active ingredients in the application solutions on an industrial scale.
  • the liquid single-phase degreasing agents for aluminum surfaces contain as essential builder substances, ie buffer substances, alkali metal and / or ammonium carbonate and alkali metal and / or ammonium hydrogen carbonate.
  • Carbonates and hydrogen carbonates from the group of compounds of the general formulas (I) and (II) come into question from the group of the compounds covered by these generic terms MM ⁇ CO3 (I) MHCO3 (II) in which M and M ⁇ may be the same or different and represent lithium, sodium, potassium or ammonium of the formula NHR1R2R3, where R1, R2 and R3 are the same or different and are hydrogen, alkyl having 1 to 6 carbon atoms or hydroxyalkylene having 1 to 6 C atoms in the alkylene radical.
  • any alkyl residues and / or alkanol residues that are present can be straight-chain or branched; straight chain residues are preferred.
  • sodium carbonate and sodium bicarbonate, potassium carbonate and potassium bicarbonate, and triethanolammonium carbonate and triethanolammonium bicarbonate are preferred.
  • a carbonate in addition to a bicarbonate or a carbonate in addition to a number of bicarbonates or a number of carbonates in addition to a bicarbonate or a number of carbonates in addition to a number of bicarbonates can be used.
  • alkali metal and / or ammonium carbonate and alkali metal and / or ammonium hydrogen carbonate are used in combination with one another, an increased removal of the aluminum surfaces is not observed; nevertheless, an excellent degreasing effect is achieved on the aluminum surfaces at moderately alkaline pH values.
  • the degreasing agents preferably contain sodium and / or potassium and / or triethanolammonium carbonate and sodium and / or potassium and / or triethanolammonium hydrogen carbonate in a ratio of 1:10 to 3: 1, with a ratio in the range of 1: 2 being preferred is.
  • the compounds are usually used in the production of such single-phase degreasing agents in the form of their hydrates, which dissolve in the aqueous phase even after a short contact with water and without the need for long-term stirring.
  • the liquid single-phase degreasing agents for aluminum surfaces contain, in addition to the carbonate salts mentioned, one or more complexing agents from the group consisting of acrylic polymers and other complexing agents.
  • "Acrylic polymers" in the compositions according to the invention are understood to mean polymers of acrylic acid and / or methacrylic acid or copolymers of acrylic acid and / or methacrylic acid with a further monomer containing olefinic double bonds as well as the water-soluble salts of such polymers or copolymers.
  • water-soluble salts are the alkali metal and / or ammonium salts of the polymers or copolymers mentioned, in which one of the groups defined above for M in the general formula (I) acts as the salt-forming cation.
  • the sodium, potassium and / or triethanolammonium salts can be used with particular advantage because of their easy accessibility.
  • “Other complexing agents” mean complexing agents known from the prior art, such as, for example, citric acid, gluconic acid, acetaldehyde glyoxylic acid polyacetal, ethylenediaminetetraacetic acid (EDTA) or nitrilotriacetic acid (NTA) or their alkali metal or ammonium salts, preferably their sodium, potassium or triethanolammonium salts.
  • the acrylic polymers used in the degreasing agents according to the invention are particularly advantageously those compounds which are selected from the group of the polymers of acrylic acid, methacrylic acid, sodium acrylate, sodium methacrylate, copolymers of acrylic acid and / or methacrylic acid and maleic acid and the sodium salt of acrylic and / or methacrylic acid.
  • Maleic acid copolymers are known to have sequestering properties, ie they are able to act as complexing agents for metal ions. In this property, those polymers or their sodium and / or triethanolammonium salts from the group mentioned which have a molecular mass in the range from 30,000 to 150,000 are particularly advantageously active.
  • these compounds Compared to the phosphates or polyphosphates used in the prior art, these compounds have the advantage that they are not only stable against hydrolysis in aqueous solution, but - with a comparable sequestering effect - do not lead to eutrophication of the surface waters and therefore no ecological damage cause.
  • one or more other complexing agents can optionally be used instead of or together with the acrylic polymers mentioned.
  • the degreasing agents according to the invention can be diluted solely with acrylic polymers, ie without the addition of such other complexing agents, with tap water of the usual hardness without precipitation of any precipitate to give application solutions, it can nevertheless be used under certain conditions, for example in the intended use of particularly hard water Dilute, it may be desirable to add such other complexing agents to the degreasing agents according to the invention.
  • a compound from the group of citric acid, gluconic acid, acetaldehyde glyoxylic acid polyacetal, ethylenediaminetetraacetic acid (EDTA), nitrilotriacetate (NTA) and their alkali metal and / or ammonium salts as complexing agents.
  • the sodium, potassium and / or triethanolammonium salts are preferably used as complexing agents together with or instead of the acrylic polymers.
  • sodium citrate, sodium gluconate or the sodium salt of acetaldehyde glyoxylic acid polyacetal and / or the corresponding potassium or triethanolammonium salts are suitable for supplementing or replacing the acrylic polymer or polymers in the liquid single-phase degreasing agents according to the invention for aluminum surfaces.
  • the compounds mentioned, together with the acrylic polymer, contribute to a sequestering, ie complexing effect.
  • acrylic polymers and other complexing agents from the groups mentioned can in principle be mixed in any weight ratios, it is preferred according to the invention to use acrylic polymers and other complexing agents in a weight ratio of 100: 0 to 50:50, preferably 100: 0 to 80 : 20 to use.
  • the single-phase degreasing agents contain one or more anionic or nonionic surfactants as further essential components.
  • Preferred surfactants are those compounds which from the group of the adducts of ethylene oxides and / or propylene oxide with fatty alcohols, alkylphenols having 6 to 22 carbon atoms in the alkyl radical, fatty amines, fatty alkyl-derivatized ether amines, unsaturated, epoxidized and optionally subsequently with monohydric alcohols ring-opened and saturated fatty acids with 6 to 22 carbon atoms in the straight-chain or branched alkyl radicals and the alkylbenzenesulfonic acids, the alkanesulfonic acids, the alkyl sulfates and alkyl ether sulfates and their water-soluble salts, preferably their alkali metal and / or ammonium salts, having 6 to 22 carbon atoms in the alkyl radical.
  • addition products on average 1 to 20 mol of the respective alkylene oxide are attached to 1 mol of the respective fat derivative, ie the fatty alcohol, alkylphenol, fatty amine, etheramine or the fatty acid or its derivatives.
  • the respective fat derivative ie the fatty alcohol, alkylphenol, fatty amine, etheramine or the fatty acid or its derivatives.
  • addition products of ethylene oxide and / or propylene oxide with fatty alcohols from the group octanol, nonanol, decanol, undecanol, dodecanol, tridecanol, tetradecanol, pentadecanol, hexadecanol, heptadecanol, octadecanol, nonadecanol, eicosanol, uneicosanol, docosanol or docosanol.
  • straight-chain fatty alcohols and also mixtures of alcohols of the type which are inexpensively obtainable from natural fats or oils or their mixtures are usually preferred on an industrial scale.
  • addition products of ethylene oxide and / or propylene oxide with tallow fatty alcohols, coconut fatty alcohols and / or comparable fatty alcohol mixtures of native origin are used with particular advantage.
  • Addition products to alkylphenols having 6 to 22 carbon atoms in the alkyl radical are also suitable according to the invention as a surfactant component.
  • Ethylene oxide and / or propylene oxide can thus be added to the alkylphenols in the abovementioned quantitative ratios which contain the following groups as the alkyl chain: hexyl, heptyl, octyl, nonyl, decyl, undecyl, dodecyl, tridecyl, tetradecyl, pentadecyl, hexadecyl, heptadecyl, octadecyl, Nonadecyl, Eicosyl, Uneicosyl or Docosyl.
  • ethylene oxide and / or propylene oxide to fatty amines from the group consisting of octylamine, nonylamine, decylamine, undecylamine, dodecylamine, tridecylamine, tetradecylamine, pentadecylamine, hexadecylamine, heptadecylamine, nonadylylamine, octadecylamine and octadecylamine, octadecylamine, octadecylamine, octadecylamine, octadecylamine, octadecylamine, octadecylamine, octadecylamine, octadecylamine, octadecylamine, octadecylamine, octadecaminamine, and to use do
  • Addition products of ethylene oxide and / or propylene oxide onto fatty alkyl-derivatized ether amines are also suitable as surfactant components which can be used according to the invention.
  • the latter are tertiary amines containing ether groups and have at least one alkyl polyglycol ether group on the amino nitrogen atom.
  • Those alkyl radicals with 6 to 22 carbon atoms which have been mentioned above in connection with the alkylphenols are suitable as fatty alkyl radicals; the number of EO or PO groups is between 2 and 20.
  • Corresponding Connections are described in DE-OS 35 04 242. In addition to individual compounds, mixtures of the addition products mentioned can also be used. Both the length of the fatty alkyl groups and the number of recurring alkoxy units in the adduct formed can vary over a more or less large range.
  • fatty acids which can likewise be used according to the invention as a surfactant component.
  • fatty acids can be both unsaturated and saturated fatty acids with 8 to 22 carbon atoms in the straight-chain or branched alkyl radicals.
  • addition products of ethylene oxide and / or propylene oxide with caprylic acid, pelargonic acid, capric acid, undecanoic acid, lauric acid, tridecanoic acid, myristic acid, pentadecanoic acid, palmitic acid, margaric acid, stearic acid, nonadecanoic acid, arachic acid, uneiconic acid acid and the usual productic acid as well as the starting prodic acid are used as the starting prodic acid, the behensoduic acid as well as the starting prodic acid, the behensoduic acid as well as the startingsprensic acid, the starting prodic acid, as well as the starting prodic acid, the beensoductic acid as well as the startingsprensic acid, the starting prodic acid and the prenic acidic acid used in the startingsprensic acid, as the starting prodic acid, as the startingsprensic acid, as the starting prodic acid and the produic acid, as the starting prodic acid
  • All of the surfactants from the groups of the adducts mentioned above which can be used in the degreasing agents for aluminum surfaces according to the invention have in common that 1 mol of the respective fat derivative, ie fatty alcohol, fatty amine or the respective fat acid, on average 1 to 20 mol of the respective alkylene oxide are added, it being possible to use mixtures of ethylene oxide and propylene oxide for the formation of such adducts and thus to prepare adducts to the fat derivatives mentioned which are both ethoxylated and propoxylated, the Sequence of the ethoxy or propoxy groups is indifferent.
  • a preferred range for the number of such ethoxy and / or propoxy radicals is the range from 5 to 15. Because of the - more or less statistically - ethoxylation or propoxylation reaction, mixtures of such addition products are usually used as surfactant components which have a more or less large Contain range of differently alkoxylated fat derivatives.
  • the surfactants in the liquid single-phase degreasing agents for aluminum surfaces according to the invention are also alkylbenzenesulfonic acids, alkanesulfonic acids, alkyl sulfates and alkyl ether sulfates and their water-soluble salts, preferably their alkali metal and / or ammonium salts, particularly preferably their sodium and / or triethanolammonium salts , usable, wherein the alkyl radicals in the compounds mentioned or their salts can have 6 to 55 carbon atoms.
  • One or more ten are preferably used as surfactant components in the degreasing agents according to the invention side used, which have an HLB value in the range of 10 to 20. From the group of surfactants with an HLB value in the range mentioned, preference is given to those whose HLB value is in the range between 13 and 17. From this group, the non-ionic surfactants and of these the linear and / or branched fatty alcohol ethoxylates have proven to be particularly suitable and therefore preferred, since they ensure adequate water solubility with a high cleaning action due to their balanced ratio of hydrophilic to lipophilic part of the molecule. As already mentioned above, both individual surfactants and mixtures of different surfactants are used as essential surfactant components in the degreasing agents according to the invention, as long as they meet the above-mentioned requirements.
  • two surfactants which can be used individually or in mixtures with one another in the degreasing agents according to the invention prove to be particularly advantageous. It is the adduct of an average of 12 moles of ethylene oxide (EO) and coconut amine (fatty amine with a number of carbon atoms in the range from 12 to 18) and the adduct of 10 mol of EO to a fatty acid epoxide with 12 to 14 carbon atoms that had been reacted with ethylene glycol.
  • EO ethylene oxide
  • coconut amine fatty amine with a number of carbon atoms in the range from 12 to 18
  • the degreasing agents according to the invention measure only very small amounts of aluminum removed from the metal surfaces.
  • the agents according to the invention - if this is desired - can also have corrosion inhibitors added be set without the advantageous properties of the aqueous single-phase degreasing agents according to the invention suffering.
  • Chromium salts and / or silicates, for example, are known from the prior art as such corrosion inhibitors. These can also be added to the agents according to the invention in amounts of 0 to 5% by weight.
  • the agents according to the invention also contain water. With appropriate packaging, it is possible here to use deionized water, which is to be understood as the preferred embodiment. However, it is also possible to introduce the components mentioned into normal process water or tap water. The degreasing effect of the agents according to the invention does not deteriorate as a result.
  • the liquid, phosphate-free single-phase degreasing agents according to the invention for aluminum surfaces contain alkali metal and / or ammonium carbonate and alkali metal and / or ammonium hydrogen carbonate in a total amount of 1 to 20% by weight, which, like the following percentages, indicates that Total weight of the degreasing agents are related; the two carbonates are preferably present in a total amount of 5 to 13% by weight.
  • the amount of the complexing agents according to the invention - it being possible for one or more of the compounds mentioned to be used - according to the invention is in the range from 1 to 10% by weight in total, particularly preferably in the range from 5 to 8% by weight; the said or the ge
  • the named anionic or nonionic surfactants are contained in a total amount of 0.1 to 10, particularly preferably in a total amount of 1 to 3% by weight, while the active ingredients and / or auxiliaries customarily used in such degreasing agents, if desired, are present in total amounts from 0 to 18% by weight, particularly preferably in total amounts from 1 to 10% by weight.
  • the component water which is likewise essential according to the invention, is contained in the liquid single-phase degreasing agents according to the invention for aluminum surfaces in such an amount that it supplements the total amount of all remaining components by 100% by weight.
  • the pH of the aqueous solutions is usually in the range from 8.5 to 12.5, with a pH Value from 9.0 to 9.8 is particularly preferred.
  • Degreasing agents of this type can in most cases achieve significantly better degreasing of aluminum surfaces compared to the prior art without a greater aluminum removal from the treated, i.e. to accept degreased surfaces than was usually the case with the agents from the prior art.
  • the degreasing agents according to the invention are obtained in the form of clear, isotropic solutions which have excellent storage stability even under extreme storage conditions and which do not allow inhomogeneities to be expected.
  • Both deionized and tap water or process water can be used without problems without losing the advantages of the degreasing agents according to the invention.
  • the dilution process proceeds without problems: due to the liquid formulation, a rapid distribution of the degreasing agents according to the invention in water is guaranteed, and there is no need for lengthy stirring or dissolving processes, as were required in the case of powdered concentrates from the prior art.
  • test dirt was taken up in 100 ml of toluene.
  • the specific activity of this test soil was 7.2. 105 dpm / mg test dirt.
  • the aluminum sheets were pre-cleaned before exposure to the test dirt described above.
  • a 3% strength aqueous solution - as described in Comparative Example 3 - was heated to 70 to 80 ° C. in a beaker.
  • test dirt corresponding to 100 ⁇ l of the toluene solution prepared as described above
  • the solvent was evaporated at room temperature over a period of 18 to 36 h.
  • the residual fat content P was determined according to the following equation: In this equation means NR the zero rate, A0 the initial activity, A i the residual activity and P the residual fat content in percent.
  • the aluminum sheets prepared as described above and loaded with marked test dirt were immersed vertically in cleaning solutions which contained the aqueous solutions listed below with different builder combinations.
  • the temperatures of the solutions are 50 ° C. After immersion times of 1; 2; 3; 5;
  • the aluminum sheets were pulled out of the cleaning solutions for 7 and 10 minutes. They were then hung up to dry for 3 minutes and the residual activity was then determined using the duo flow-through tube as described above. The determinations were always carried out as double or triple determinations.
  • the builder-free degreasing solutions containing only one or more surfactants also showed a relatively poor degreasing effect, even after longer dipping times and at temperatures of 50 ° C. In none of the cases could more than 40% of the test dirt be removed.
  • a degreasing solution which contained the following components in 1 l of deionized water: 5.0 g of soda; 9.42 g sodium hydrogen carbonate; 7.0 g of the sodium maleic acid / acrylic acid copolymer (Sokalan® CPS from FA. BASF) and 1.5 g of an adduct of 12 EO with coconut amine (alkylamine mixture, 8 to 18 carbon atoms in the alkyl radical).
  • the pH of the aqueous degreasing agent was 9.49.
  • the aluminum sheets were after 0.5; 1; 3; 5 and 10 min removed from the aqueous solution and then rinsed for 10 seconds under flowing, deionized water (flow rate: 3 l / min; temperature: 24 ° C). The aluminum sheets were then hung up to dry for 3 minutes and then the residual activity was measured. A triple determination was carried out. The residual fat content was determined according to the equation given above. The results can be seen in FIG. 3.
  • the present degreasing solution composed according to the invention already showed a significantly better degreasing effect at 40 ° C. than the solutions described in Comparative Examples 1 and 2. This clearly demonstrates the better degreasing effect of the degreasing agents according to the invention compared to comparable agents from the prior art.
  • Example 1 the aluminum sheets were immersed in aqueous solutions which contained the following components in 1 l of deionized water:
  • Example 2 5.0 g of soda; 10.66 g sodium hydrogen carbonate; 7.0 g of the sodium salt of acetaldehyde glyoxylic acid polyacetal; 1.5 g of the adduct of 12 EO with coconut amine; pH 9.50.
  • Example 3 5.0 g of soda; 9.85 g sodium hydrogen carbonate; 7.0 g sodium citrate; 1.5 g of the adduct of 12 EO with coconut amine; pH 9.50.
  • Example 4 5.0 g soda; 10.2 g sodium hydrogen carbonate; 7.0 g sodium gluconate; 1.5 g of the adduct of 12 EO with coconut amine; pH 9.50.
  • Example 1 the degreasing agents of Examples 2 to 4 composed according to the invention show a significantly better degreasing behavior even at a temperature of 40 ° C. than was observed with degreasing agents from the prior art.
  • Example 1 the aluminum sheets were treated with a commercially available degreasing solution for aluminum surfaces, which contained the following components in 1 liter of deionized water: 4.5 g soda; 15.0 g borax; 9.0 g sodium tripolyphosphate; 1.5 g of an adduct of 12 EO with coconut amine; pH: 9.47.
  • the degreasing agent shows satisfactory cleaning results, due to its content of condensed phosphates this agent cannot be stored over a long period of time, since tripolyphosphates are hydrolyzed in aqueous solution over a long period of time and thus lose their sequestering properties.
  • complex stirring and mixing processes are required to dissolve the borax-containing powdery product in water. However, this is considered to be disadvantageous.
  • Example 5 5.0 g soda; 5.4 g sodium hydrogen carbonate; 7.0 g of copolymeric acrylic acid (molecular ge weight 30,000 to 60,000) (Sandoclean PTE, Sandoz; see product information from Sadoz); 1.5 g of an adduct of 12 EO with coconut amine as a surfactant component.
  • the pH was 9.52.
  • Example 6 Composition as in Example 5, but instead of 1.5 g of the EO-cocosamine adduct, only 0.75 g was used; instead, 0.75 g of an adduct of 5 EO was added to a C12 ⁇ 18 fatty alcohol.
  • Example 7 Composition as in Example 5, but instead of 1.5 g of the EO-cocosamine adduct, only 0.75 g was used; in addition, 0.75 g of an adduct of 10 EO to a C13 ⁇ 14 epoxide was added, which had been reacted with ethylene glycol.
  • Example 8 Composition as in Example 5, but instead of the EO-coconut amine adduct 1.5 g of a surfactant mixture of 80 wt .-% of an adduct of 5 EO to a C12 ⁇ 18 fatty alcohol and 20 wt .-% of an etheramine were used.
  • the pH was 9.53.
  • the degreasing agents of Examples 5 to 8 showed a significantly improved degreasing effect compared to the prior art.
EP88103864A 1987-03-19 1988-03-11 Composition de dégraissage liquide monophasé pour surfaces en aluminium ne contenant pas de phosphate Withdrawn EP0282921A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3708938 1987-03-19
DE19873708938 DE3708938A1 (de) 1987-03-19 1987-03-19 Fluessige, phosphatfreie einphasen-entfettungsmittel fuer aluminiumoberflaechen

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EP0282921A1 true EP0282921A1 (fr) 1988-09-21

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EP (1) EP0282921A1 (fr)
JP (1) JPS63255384A (fr)
KR (1) KR880011370A (fr)
DE (1) DE3708938A1 (fr)
ZA (1) ZA881965B (fr)

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US5200114A (en) * 1990-08-24 1993-04-06 Man-Gill Chemical Company Alkaline cleaner for reducing stain on aluminum surfaces
EP0541034A2 (fr) * 1991-11-06 1993-05-12 Nippon Paint Co., Ltd. Solution de dégraissage et méthode
EP0646661A1 (fr) * 1992-06-10 1995-04-05 CHURCH & DWIGHT COMPANY, INC. Procédé pour enlever un flux pour soudure
EP0743357A1 (fr) * 1995-05-19 1996-11-20 Nippon Paint Co., Ltd. Solution alcaline pour le dégraissage et utilisation dans un procédé de dégraissage

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JPS63255384A (ja) 1988-10-21
DE3708938A1 (de) 1988-09-29
KR880011370A (ko) 1988-10-28
US4844744A (en) 1989-07-04

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