EP0241779B1 - Composition acide pour laver l'extérieur de wagons de chemin de fer et semblables - Google Patents

Composition acide pour laver l'extérieur de wagons de chemin de fer et semblables 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
Other languages
German (de)
English (en)
Other versions
EP0241779A2 (fr
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
Application filed by CAMPI Centro Applicazione Moderni Prodotti Industriali Srl filed Critical CAMPI Centro Applicazione Moderni Prodotti Industriali Srl
Priority to AT87104462T priority Critical patent/ATE78867T1/de
Publication of EP0241779A2 publication Critical patent/EP0241779A2/fr
Publication of EP0241779A3 publication Critical patent/EP0241779A3/en
Application granted granted Critical
Publication of EP0241779B1 publication Critical patent/EP0241779B1/fr
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. Composition pour le lavage de l'extérieur des voitures du chemin de fer, et de matériels analogues, constituée par une dispersion aqueuse contenant :
    a) de la pectine, en quantité se situant entre 1 et 10% en poids;
    b) de la gomme de xanthane, des dérivés du xanthane ou de la cellulose, en quantité se situant entre 0 et 5% en poids;
    c) du sorbitol ou un glycol, en quantité se situant entre 0 et 50% en poids;
       ladite dispersion ayant un pH acide dû à la présence d'un ou plusieurs acides organiques ou minéraux, choisi(s) dans le groupe des acides capables de dissoudre l'oxyde de fer, dans laquelle au moins l'un de ces acides est présent en quantité pouvant aller jusqu'à 30% en poids.
  2. Composition selon la revendication 1, dans laquelle le(s)dit(s) acide(s) est (sont) choisi(s) dans le groupe constitué par : l'acide sulfurique, l'acide chlorhydrique, l'acide phosphorique, l'acide oxalique, l'acide thioglycolique, l'acide citrique et l'acide sulfamique.
  3. Composition selon l'une des revendications précédentes, contenant simultanément de l'acide sulfurique et de l'acide chlorhydrique.
  4. Composition selon la revendication 1, dans laquelle la teneur en pectine est comprise entre 2 et 3% en poids.
  5. Composition selon la revendication 1, dans laquelle la teneur en gomme de xanthane est comprise entre 0,5 et 2% en poids.
  6. Composition selon la revendication 1, dans laquelle la teneur en sorbitol se situe entre 4 et 5% en poids.
  7. Composition selon la revendication 1, comportant une teneur en HCl comprise entre 0 et 30% en poids et une teneur en H₂SO₄ comprise entre 0 et 30% en poids, dans laquelle au moins l'un des acides présente une teneur différente de 0.
  8. Composition selon la revendication 7, comportant une teneur en HCl comprise entre 1 et 3% en poids et une teneur en H₂SO₄ comprise entre 2 et 4% en poids.
  9. Composition selon la revendication 1, caractérisée par le fait qu'elle présente la composition suivante :
    - pectine, se situant entre 2 et 3% en poids;
    - gomme de xanthane, se Situant entre 0,5 et 2% en poids;
    - sorbitol, se situant entre 4 et 5% en poids;
    - HCl, se situant entre 1 et 3% en poids;
    - H₂SO₄, se situant entre 2 et 4% en poids;
    - H₂O, le complément à 100% en poids.
  10. Composition selon la revendication 1, dans laquelle le glycol est choisi dans la classe constituée par l'éthylène glycol, le propylène glycol, le polyéthylène glycol.
  11. Procédé de préparation de la composition pour le lavage de l'extérieur des voitures du chemin de fer selon la revendication 1, comprenant :
    a) le mélange de la pectine et facultativement du composé choisi parmi la gomme de xanthane, un dérivé de la gomme de xanthane et de la cellulose, ainsi que du composé choisi parmi le sorbitol et un glycol, à des températures se situant entre 60 et 85°C;
    b) le refroidissement du mélange à des températures se situant entre 45 et 50°C;
    c) l'addition de l'acide ou des acides nécessaire(s).
EP87104462A 1986-04-16 1987-03-26 Composition acide pour laver l'extérieur de wagons de chemin de fer et semblables Expired - Lifetime EP0241779B1 (fr)

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 (fr) 1987-10-21
EP0241779A3 EP0241779A3 (en) 1988-10-12
EP0241779B1 true EP0241779B1 (fr) 1992-07-29

Family

ID=11163845

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87104462A Expired - Lifetime EP0241779B1 (fr) 1986-04-16 1987-03-26 Composition acide pour laver l'extérieur de wagons de chemin de fer et semblables

Country Status (5)

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

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 (fr) * 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 (fr) 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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