EP0241779B1 - Saure Zusammensetzung zum Waschen der Aussenseite von Eisenbahnwagen und dergleichen - Google Patents

Saure Zusammensetzung zum Waschen der Aussenseite von Eisenbahnwagen und dergleichen Download PDF

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Publication number
EP0241779B1
EP0241779B1 EP87104462A EP87104462A EP0241779B1 EP 0241779 B1 EP0241779 B1 EP 0241779B1 EP 87104462 A EP87104462 A EP 87104462A EP 87104462 A EP87104462 A EP 87104462A EP 0241779 B1 EP0241779 B1 EP 0241779B1
Authority
EP
European Patent Office
Prior art keywords
weight
acid
composition according
ranging
content
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.)
Expired - Lifetime
Application number
EP87104462A
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English (en)
French (fr)
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EP0241779A2 (de
EP0241779A3 (en
Inventor
Gianni Campagna
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.)
CAMPI Centro Applicazione Moderni Prodotti Industriali Srl
Original Assignee
CAMPI Centro Applicazione Moderni Prodotti Industriali Srl
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
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Priority to AT87104462T priority Critical patent/ATE78867T1/de
Publication of EP0241779A2 publication Critical patent/EP0241779A2/de
Publication of EP0241779A3 publication Critical patent/EP0241779A3/en
Application granted granted Critical
Publication of EP0241779B1 publication Critical patent/EP0241779B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
    • C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
    • C11D3/00—Other compounding ingredients of detergent compositions covered in group C11D1/00
    • C11D3/16—Organic compounds
    • C11D3/20—Organic compounds containing oxygen
    • C11D3/22—Carbohydrates or derivatives thereof
    • C11D3/222—Natural or synthetic polysaccharides, e.g. cellulose, starch, gum, alginic acid or cyclodextrin
    • C—CHEMISTRY; METALLURGY
    • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
    • C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
    • C11D7/00—Compositions of detergents based essentially on non-surface-active compounds
    • C11D7/02—Inorganic compounds
    • C11D7/04—Water-soluble compounds
    • C11D7/08—Acids
    • C—CHEMISTRY; METALLURGY
    • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
    • C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
    • C11D7/00—Compositions of detergents based essentially on non-surface-active compounds
    • C11D7/22—Organic compounds
    • C11D7/26—Organic compounds containing oxygen
    • C11D7/263—Ethers
    • C—CHEMISTRY; METALLURGY
    • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
    • C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
    • C11D7/00—Compositions of detergents based essentially on non-surface-active compounds
    • C11D7/22—Organic compounds
    • C11D7/26—Organic compounds containing oxygen
    • C11D7/265—Carboxylic acids or salts thereof
    • C—CHEMISTRY; METALLURGY
    • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
    • C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
    • C11D7/00—Compositions of detergents based essentially on non-surface-active compounds
    • C11D7/22—Organic compounds
    • C11D7/32—Organic compounds containing nitrogen
    • C11D7/3227—Ethers thereof
    • 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
    • C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
    • C23G1/025—Cleaning or pickling metallic material with solutions or molten salts with acid solutions acidic pickling pastes

Definitions

  • This invention relates to an acid composition for washing the exterior of railway carriages and the like, and to the relative preparation process.
  • the basic reason for washing the exterior of railway carriages is to remove the iron oxide which deposits on the paintwork and windows. Said iron oxide originates mainly from the abrasion due to the friction generated between the brake blocks and the wheels, and to a lesser extent originates from all parts of the underbody and rails. In all cases, washing is carried out with acid compositions and it is therefore assumed that the paintwork is intact.
  • the products currently used are strong mineral acids thickened with various substances, and can be divided essentially into two types: the concentrated type, which generally consists of a product in powder form which is diluted with water before use; the type ready for use, which consists of a creamy paste able to adhere to the vertical surfaces to be washed.
  • the products of concentrated type have various drawbacks in their application: they are formed from aggressive substances and therefore have to be handled with care; on dilution they give rise to the formation of lumps which obstruct the spray nozzles; the stability of the dispersions is very brief; finally, it is always possible to make mistakes in the dilution proportions, with consequent possibility of damage both to the carriages and to the person if the products are too concentrated, or of not obtaining effective washing if the dispersion is too dilute.
  • acid compositions for washing the exterior of railway carriages can be prepared using pectin as the thickening agent, a substance well known to be unsuitable for use in a strongly acid environment (pH 0-1) as a gelling agent.
  • composition according to the invention is characterised by consisting of an aqueous dispersion containing pectin as the thickening agent, and possibly xanthan gum and sorbitol, and having acid pH due to the presence of one or more mineral or organic acids chosen from the group of acids able to dissolve iron oxide.
  • Said composition is prepared by a method characterised by mixing pectin, xanthan gum and sorbitol with water at 60-85°C, cooling to 45-50°C and adding the acids at this temperature.
  • the acids used in the composition are preferably sulphuric acid and hydrochloric acid, but other mineral or organic acids can be used provided they are able to dissolve iron oxide, such as phosphoric acid, oxalic acid, thioglycolic acid, citric acid and sulphamic acid.
  • the content of the various substances in the composition is as follows, expressed in percentage by weight: pectin 1-10% xanthan gum 0-5% sorbitol 0-50% HCl 0-30.0% H2SO4 0-30.0% H2O difference to 100% in which at least one of the two acids is present.
  • the content of the various substances in the composition is as follows, expressed in percentage by weight: pectin 2-3% xanthan gum 0.5-2% sorbitol 4-5% HCl 1-3% H2SO4 2-4% H2O difference to 100%
  • the pectin constitutes the essential component of the composition and exercises a thickening effect on the composition itself.
  • the xanthan gum improves the thickening characteristics of the pectin, and its presence is important to prevent the dispersion breaking down.
  • the effect of the xanthan gum can also be attained with its derivatives or with other thickening agents, such as celluloses, however the stability of these against strong acids is very low.
  • Sorbitol which is added in the form of a 70 weight% syrup, improves the wetting characteristics of the mixture so that its application is more uniform, droplets do not form and there is no drying. In practice, the sorbitol exerts a surprising surface-active effect in the mixture.
  • the sorbitol can be replaced by glycols, for example ethylene, propylene, polyethylene or polypropylene glycol, which however cannot be used if surfaces painted with alkyd paints are to be treated.
  • composition similtaneously contains two acids, however a single acid can also be used.
  • the pectin and possibly the xanthan gum and sorbitol are poured into water, the mixture agitated with very violent agitation while being heated to a temperature of between 60 and 85°C, and this temperature maintained under agitation for minutes. It is then cooled to a temperature of between 45 and 50°C, the acid or acids added, and this temperature maintained for 14-20 hours without agitation. In this manner a composition of syrupy, ungelled fluid consistency is obtained which after subsequent cooling to 25°C is packaged in cartons, drums or other types of container, which in all cases must be of non-metallic type.
  • the acid in the sequence and under the conditions described, ie the acid must be added as the last component when the pectin has already dissolved, and at a lower temperature than the temperature at which the organic products are mixed with the water, to prevent any rapid degradation of the pectin.
  • the composition according to the invention offers great advantage over known products from the ecological viewpoint, especially when the carriages are washed in stations or in carriage parks having no adequate effluent plant, in that there is no risk of pollutant substances entering the ground.
  • the organic components of the composition are completely innocuous as they are products widely used in the foodstuffs field, and in addition their concentration in the product is such that the wash effluents have an extremely low organic content, the acidity of the composition being very low compared with that of known products and is rapidly neutralised on contact with calcareous materials in the ground.
  • composition according to the invention when sprayed on to the carriage wall it resists drying for a time greater than that of known products, thus resulting in higher efficiency.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Wood Science & Technology (AREA)
  • Health & Medical Sciences (AREA)
  • Emergency Medicine (AREA)
  • Inorganic Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Molecular Biology (AREA)
  • Detergent Compositions (AREA)
  • Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
  • Vehicle Cleaning, Maintenance, Repair, Refitting, And Outriggers (AREA)

Claims (11)

  1. Verfahren zur Herstellung einer Zusammensetzung zum Waschen des Äußeren von Eisenbahnwagen und dergleichen, bestehend aus einer wässrigen Dispersion enthaltend:
    a) Pectin in Mengen im Bereich von 1 bis 10 Gew.%,
    b) Xanthangummi, Xanthanderivate oder Cellulose in Mengen im Bereich von 0 bis 5 Gew.%;
    c) Sorbit oder Glycol in Mengen im Bereich von 0 bis 50 Gew.%;
    wobei die Dispersion einen sauren pH-Wert besitzt, der abhängig ist von der Gegenwart einer oder mehrerer organischer- oder Mineralsäuren, die ausgewählt sind aus der Gruppe von Säuren, die dazu fähig sind, Eisenoxid aufzulösen, und worin mindestens eine dieser Säuren in Mengen von bis zu 30 Gew.% vorhanden ist,
    dadurch gekennzeichnet, daß
    das Verfahren die folgenden Stufen umfaßt:
    I) Mischen des Pectins und gegebenenfalls der Verbindung, die ausgewählt ist aus Xanthangummi, dem Xanthangummiderivat und Cellulose und der Verbindung, ausgewählt aus Sorbit und Glycol bei Temperaturen im Bereich von 60 bis 85°C;
    II) Kühlen der Mischung auf Temperaturen im Bereich von 45 bis 50°C;
    III) Zugabe der erforderlichen Säure oder Säuren.
  2. Verfahren nach Anspruch 1,
    dadurch gekennzeichnet, daß
    die Säure oder Säuren ausgewählt sind aus der Gruppe bestehend aus Schwefelsäure, Chlorwasserstoffsäure, Phosphorsäure, Oxalsäure, Thioglycolsäure, Zitronensäure und Sulphaminsäure.
  3. Verfahren nach einem der vorhergehenden Ansprüche,
    dadurch gekennzeichnet, daß
    die Zusammensetzung gleichzeitig Schwefelsäure und Chlorwasserstoffsäure enthält.
  4. Verfahren nach Anspruch 1,
    dadurch gekennzeichnet, daß
    der Pectingehalt der Endzusammensetzung zwischen 2 und 3% liegt.
  5. Verfahren nach Anspruch 1,
    dadurch gekennzeichnet, daß
    der Xanthangummigehalt in der Endzusammensetzung zwischen 0,5 und 2 Gew.% liegt.
  6. Verfahren nach Anspruch 1,
    dadurch gekennzeichnet, daß
    der Sorbitgehalt in der Endzusammensetzung im Bereich von 4 bis 5 Gew.% liegt.
  7. Verfahren nach Anspruch 1,
    dadurch gekennzeichnet, daß
    in der Endzusammensetzung der HCl-Gehalt zwischen 0 und 30 Gew.% und der H₂SO₄-Gehalt zwischen 0 und 30 Gew.% liegt, wobei mindestens eine Säure einen von 0 verschiedenen Gehalt besitzt.
  8. Verfahren nach Anspruch 7,
    dadurch gekennzeichnet, daß
    die Endzusammensetzung einen Gehalt an HCl zwischen 1 und 3 Gew.% und einen Gehalt an H₂SO₄ zwischen 2 und 4 Gew.% besitzt.
  9. Verfahren nach Anspruch 1 zur Herstellung der folgenden Zusammensetzung:
    Pectin im Bereich von 2 bis 3 Gew.%;
    Xanthangummi im Bereich von 0,5 bis 2 Gew.%;
    Sorbit im Bereich von 4 bis 5 Gew.%;
    HCl im Bereich von 1 bis 3 Gew.%;
    H₂SO₄ im Bereich von 2 bis 4 Gew.%;
    H₂O als Differenz auf 100 Gew.%.
  10. Verfahren nach Anspruch 1,
    dadurch gekennzeichnet, daß
    das Glycol ausgewählt ist aus der Klasse bestehend aus Ethylenglycol, Propylenglycol, Polyethylenglycol.
EP87104462A 1986-04-16 1987-03-26 Saure Zusammensetzung zum Waschen der Aussenseite von Eisenbahnwagen und dergleichen Expired - Lifetime EP0241779B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT87104462T ATE78867T1 (de) 1986-04-16 1987-03-26 Saure zusammensetzung zum waschen der aussenseite von eisenbahnwagen und dergleichen.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT2010686 1986-04-16
IT20106/86A IT1204304B (it) 1986-04-16 1986-04-16 Composizione acida per il lavaggio esterno di carrozze ferroviarie e simili

Publications (3)

Publication Number Publication Date
EP0241779A2 EP0241779A2 (de) 1987-10-21
EP0241779A3 EP0241779A3 (en) 1988-10-12
EP0241779B1 true EP0241779B1 (de) 1992-07-29

Family

ID=11163845

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87104462A Expired - Lifetime EP0241779B1 (de) 1986-04-16 1987-03-26 Saure Zusammensetzung zum Waschen der Aussenseite von Eisenbahnwagen und dergleichen

Country Status (5)

Country Link
EP (1) EP0241779B1 (de)
AT (1) ATE78867T1 (de)
DE (1) DE3780678T2 (de)
ES (1) ES2033710T3 (de)
IT (1) IT1204304B (de)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2707280B1 (fr) * 1993-07-09 1995-10-13 Rhone Poulenc Chimie Composition aqueuse d'acide sulfamique épaissie.
SE9403541L (sv) * 1994-10-14 1996-04-15 Sven Moberg Antimikrobiell komposition
ZA974982B (en) * 1996-06-06 1998-01-23 Monsanto Co Acidic cleaning compositions containing xanthan gum.
IN2014MN02036A (de) * 2012-04-23 2015-08-14 Unilever Plc

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU431227B2 (en) * 1969-01-30 1972-12-20 T. Squire Albert Noncorrosive rust remover
DE1908032A1 (de) * 1969-02-18 1970-09-03 Farbenkrauth & Co Verfahren zum Entzundern und Entrosten

Also Published As

Publication number Publication date
DE3780678D1 (de) 1992-09-03
DE3780678T2 (de) 1993-01-21
ES2033710T3 (es) 1993-04-01
EP0241779A2 (de) 1987-10-21
ATE78867T1 (de) 1992-08-15
EP0241779A3 (en) 1988-10-12
IT8620106A0 (it) 1986-04-16
IT1204304B (it) 1989-03-01

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