EP2439261A1 - Produit liquide à base de chlorhydrate d'urée pour l'élimination de sels de calcium insolubles. - Google Patents

Produit liquide à base de chlorhydrate d'urée pour l'élimination de sels de calcium insolubles. Download PDF

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Publication number
EP2439261A1
EP2439261A1 EP20110183907 EP11183907A EP2439261A1 EP 2439261 A1 EP2439261 A1 EP 2439261A1 EP 20110183907 EP20110183907 EP 20110183907 EP 11183907 A EP11183907 A EP 11183907A EP 2439261 A1 EP2439261 A1 EP 2439261A1
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EP
European Patent Office
Prior art keywords
product
urea hydrochloride
organic acid
acid
calcium salts
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.)
Granted
Application number
EP20110183907
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German (de)
English (en)
Other versions
EP2439261B1 (fr
Inventor
Barnabé Wayser
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CBA World SA
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Individual
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Publication of EP2439261A1 publication Critical patent/EP2439261A1/fr
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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
    • C11D3/2075—Carboxylic acids-salts thereof
    • C11D3/2086—Hydroxy carboxylic acids-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
    • C11D3/00—Other compounding ingredients of detergent compositions covered in group C11D1/00
    • C11D3/16—Organic compounds
    • C11D3/26—Organic compounds containing nitrogen
    • C11D3/32—Amides; Substituted amides
    • C11D3/323—Amides; Substituted amides urea or derivatives 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
    • C11D2111/00—Cleaning compositions characterised by the objects to be cleaned; Cleaning compositions characterised by non-standard cleaning or washing processes
    • C11D2111/10—Objects to be cleaned
    • C11D2111/14—Hard surfaces
    • C11D2111/24—Mineral surfaces, e.g. stones, frescoes, plasters, walls or concretes

Definitions

  • the present invention relates to a liquid product for the removal of insoluble calcium salts, such as calcium carbonate. More particularly, the product according to the present invention is intended for stripping concrete surfaces, metal surfaces or other to remove the residues and efflorescences of concrete or cement they carry.
  • the object of the present invention is to improve the quality and to reduce the pickling time with the aid of products based on urea hydrochloride.
  • the liquid product based on urea hydrochloride for the removal of insoluble calcium salts is remarkable in that it comprises a weak organic acid of molar mass at most equal to 80 g and the molar proportion of said weak organic acid relative to urea hydrochloride is from 1: 10 to 1:20.
  • weak acid denotes an acid whose dissociation constant in solution is only of the order of a few percent.
  • the addition of a small proportion of a weak acid to urea hydrochloride does not increase the corrosivity of the product.
  • the Applicant has found that if the weak acid used is of the organic type, only if the molar mass of this organic acid is small (at most equal to 80 g) and if the molar ratio between the said weak organic acid and the urea hydrochloride is small (between 1:10 and 1:20), the addition of said weak acid to urea hydrochloride makes it possible to significantly increase the stripping action of the latter and to reduce the residence time. removal of concrete and cement residues. In other words, the Applicant has found that under certain conditions there is a synergistic effect between urea hydrochloride and weak organic acid.
  • the Applicant believes that the low corrosivity and the low mass of the organic acid used allow it to penetrate deeply the concrete and cement residues without reacting immediately with them, but causing the hydrochloride 'urea. Thus, the latter is brought deep inside said residues and can exert, in cooperation with said weak organic acid, a destructuring effect of said residues from the heart thereof.
  • said weak organic acid is glycolic acid and the molar ratio of glycolic acid to urea hydrochloride is at least approximately 1: 15.
  • the product according to the invention is advantageously in the form of an aqueous solution.
  • One hundred grams of this aqueous solution then comprise at least approximately 40 g of urea hydrochloride and 2 g of glycolic acid.
  • the surface tension of the product can be adjusted by a surfactant, while it is advantageous to incorporate a corrosion inhibitor into said product, especially if the product is intended for pickling metal objects.
  • the present invention relates to an effective and non-corrosive pickling product capable of removing residues, efflorescences or heaps of concrete or cement hung on all kinds of surfaces, and particularly surfaces. concrete and metal surfaces.
  • the product of the invention can therefore be used, safely by the operators and without damage to the surfaces to be stripped, to strip concrete constructions, as well as the tools and equipment used for these constructions.
  • the product according to the invention can even be used to strip paint-coated surfaces without damaging the surfaces.

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  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Wood Science & Technology (AREA)
  • Organic Chemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Emergency Medicine (AREA)
  • Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
  • Detergent Compositions (AREA)

Abstract

- Produit liquide à base de chlorhydrate d'urée pour l'élimination de sels de calcium insolubles - Selon l'invention, ledit produit comporte un acide organique faible de masse molaire au plus égale à 80g et en ce que la proportion molaire dudit acide organique faible par rapport au chlorhydrate d'urée est comprise entre 1 :10 et 1 :20.

Description

  • La présente invention concerne un produit liquide pour l'élimination de sels de calcium insolubles, tels que le carbonate de calcium. Plus particulièrement, le produit conforme à la présente invention est destiné au décapage de surfaces de béton, de surfaces métalliques ou autres pour en éliminer les résidus et efflorescences de béton ou de ciment qu'elles portent.
  • On sait que, pour éliminer de tels résidus et efflorescences, on peut utiliser un acide fort, comme l'acide chlorhydrique ou l'acide phosphorique. Cependant, l'utilisation de tels acides forts est délicat et dangereux pour les opérateurs, notamment du fait de leur corrosivité et des vapeurs qu'ils émettent. De plus, ces acides forts attaquent non seulement lesdits résidus, mais également les surfaces qui les portent, ce qui les rend inutilisables pour le décapage de surfaces métalliques et rend leur utilisation difficile pour le décapage d'autres surfaces, y compris des surfaces de béton.
  • Pour remédier à ces inconvénients, il a été proposé, par exemple par les documents US 5 672 279 et US 2006/0063689 , de remplacer de tels acides forts par du chlorhydrate d'urée, peu corrosif. Toutefois, à cause de ce caractère peu corrosif, la qualité du décapage obtenu n'est pas optimale et le temps de décapage est relativement long.
  • La présente invention a pour objet d'améliorer la qualité et de réduire le temps du décapage à l'aide des produits à base de chlorhydrate d'urée.
  • A cette fin, selon l'invention, le produit liquide à base de chlorhydrate d'urée pour l'élimination de sels de calcium insolubles est remarquable en ce qu'il comporte un acide organique faible de masse molaire au plus égale à 80g et en ce que la proportion molaire dudit acide organique faible par rapport au chlorhydrate d'urée est comprise entre 1 : 10 et 1 :20.
  • De façon usuelle, par « acide faible », on désigne un acide dont la constante de dissociation en solution est seulement de l'ordre de quelques pour-cents.
  • Ainsi, l'addition d'une faible proportion d'un acide faible au chlorhydrate d'urée n'augmente pas la corrosivité du produit. De plus, le Demandeur a trouvé que si l'acide faible utilisé est du type organique, que si la masse molaire de cet acide organique est petite (au plus égale à 80g) et que si le rapport molaire entre ledit acide organique faible et le chlorhydrate d'urée est petit (entre 1 :10 et 1 :20), l'addition dudit acide faible au chlorhydrate d'urée permet d'augmenter de façon significative l'action de décapage de ce dernier et de réduire le temps d'élimination des résidus de béton et de ciment. En d'autres termes, le Demandeur a trouvé que, dans certaines conditions, il existe un effet de synergie entre le chlorhydrate d'urée et l'acide organique faible.
  • Pour expliquer cette synergie, le Demandeur pense que la faible corrosivité et la faible masse de l'acide organique utilisé permettent à celui-ci de pénétrer en profondeur les résidus de béton et de ciment sans réagir immédiatement avec eux, mais en entraînant le chlorhydrate d'urée. Ainsi, ce dernier est amené profondément à l'intérieur desdits résidus et peut exercer, en coopération avec ledit acide organique faible, un effet déstructurant desdits résidus depuis le coeur de ceux-ci.
  • La validité de la présente invention n'est évidemment pas liée à celle de l'explication donnée ci-dessus à titre de simple hypothèse.
  • Toutefois, cette explication hypothétique est confortée par le fait que, si on remplace la petite proportion d'acide organique faible et de petite masse molaire par une proportion aussi petite d'un acide minéral de même petite masse molaire, on n'obtient pas l'effet de synergie désiré : tout se passe comme si cet acide minéral réagissait trop vite, en créant une attaque de surface sans pénétration efficace des résidus de béton ou de ciment apte à entraîner le chlorhydrate d'urée. De même, si la petite proportion d'acide organique faible et de petite masse molaire est remplacée par une proportion aussi petite d'un acide organique faible de masse molaire importante (supérieure à 80g), on n'obtient pas non plus l'effet de synergie, vraisemblablement à cause d'une difficulté de pénétration à l'intérieur desdits résidus, ce qui produit une attaque superficielle immédiate, sans entraînement du chlorhydrate d'urée à l'intérieur desdits résidus.
  • De préférence, ledit acide organique faible est l'acide glycolique et le rapport molaire de l'acide glycolique au chlorhydrate d'urée est au moins approximativement égal à 1 : 15.
  • Le produit selon l'invention se présente avantageusement sous la forme d'une solution aqueuse. Cent grammes de cette solution aqueuse comportent alors au moins approximativement 40g de chlorhydrate d'urée et 2g d'acide glycolique.
  • La tension superficielle du produit peut être réglée par un agent tensioactif, tandis qu'il est avantageux d'incorporer audit produit un inhibiteur de corrosion, surtout si le produit est destiné au décapage d'objets métalliques.
  • Ainsi, de ce qui précède, on constate que la présente invention concerne un produit de décapage efficace et non corrosif, apte à éliminer des résidus, des efflorescences ou des amas de béton ou de ciment accrochés à toutes sortes de surfaces, et particulièrement des surfaces de béton et des surfaces métalliques. Le produit de l'invention peut donc être utilisé, en toute sécurité par les opérateurs et sans dommage pour les surfaces à décaper, pour décaper les constructions en béton, ainsi que les outils et équipements utilisés pour ces constructions. Le produit selon l'invention peut même être utilisé pour décaper des surfaces recouvertes de peinture, sans pour autant endommager celle-ci.

Claims (6)

  1. Produit liquide à base de chlorhydrate d'urée pour l'élimination de sels de calcium insolubles,
    caractérisé en ce qu'il comporte un acide organique faible de masse molaire au plus égale à 80g et en ce que la proportion molaire dudit acide organique faible par rapport au chlorhydrate d'urée est comprise entre 1 :10 et 1 :20.
  2. Produit selon la revendication 1,
    caractérisé en ce que ledit acide organique faible est l'acide glycolique.
  3. Produit selon la revendication 2,
    caractérisé en ce que le rapport molaire de l'acide glycolique au chlorhydrate d'urée est au moins approximativement égal à 1 :15.
  4. Produit selon la revendication 3,
    caractérisé en ce qu'il se présente sous la forme d'une solution aqueuse dont 100g comportent au moins approximativement 40g de chlorhydrate d'urée et 2g d'acide glycolique.
  5. Produit selon l'une des revendications 1 à 4,
    caractérisé en ce qu'il comporte un inhibiteur de corrosion.
  6. Produit selon l'une des revendications 1 à 5,
    caractérisé en ce qu'il comporte un agent tensioactif.
EP11183907.2A 2010-10-07 2011-10-05 Produit liquide à base de chlorhydrate d'urée pour l'élimination de sels de calcium insolubles. Active EP2439261B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1058147A FR2965817B1 (fr) 2010-10-07 2010-10-07 Produit liquide a base de chlorhydrate d'uree pour l'elimination de sels de calcium insolubles.

Publications (2)

Publication Number Publication Date
EP2439261A1 true EP2439261A1 (fr) 2012-04-11
EP2439261B1 EP2439261B1 (fr) 2015-12-02

Family

ID=43982178

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Application Number Title Priority Date Filing Date
EP11183907.2A Active EP2439261B1 (fr) 2010-10-07 2011-10-05 Produit liquide à base de chlorhydrate d'urée pour l'élimination de sels de calcium insolubles.

Country Status (2)

Country Link
EP (1) EP2439261B1 (fr)
FR (1) FR2965817B1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR3004460A1 (fr) * 2013-04-16 2014-10-17 Cba World S A Rl Produit pour l'elimination de residus de sels de calcium insolubles.

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5451264A (en) * 1994-04-04 1995-09-19 James, Jr.; Jarvis M. Method for removing hardened concrete
US5672279A (en) 1992-07-24 1997-09-30 Peach State Labs, Inc. Method for using urea hydrochloride
GB2416773A (en) * 2004-08-06 2006-02-08 Reckitt Benckiser Inc Aqueous acidic hard surface cleaning compositions and process for cleaning
US20060063689A1 (en) 2004-09-20 2006-03-23 Netherton Jason J Concrete cleaning and preparation composition
US20060063777A1 (en) * 2004-09-21 2006-03-23 Perry Stephen C Anti-microbial and anti-fungal shampoo for mammals especially humans and dogs

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5672279A (en) 1992-07-24 1997-09-30 Peach State Labs, Inc. Method for using urea hydrochloride
US5451264A (en) * 1994-04-04 1995-09-19 James, Jr.; Jarvis M. Method for removing hardened concrete
GB2416773A (en) * 2004-08-06 2006-02-08 Reckitt Benckiser Inc Aqueous acidic hard surface cleaning compositions and process for cleaning
US20060063689A1 (en) 2004-09-20 2006-03-23 Netherton Jason J Concrete cleaning and preparation composition
US20060063777A1 (en) * 2004-09-21 2006-03-23 Perry Stephen C Anti-microbial and anti-fungal shampoo for mammals especially humans and dogs

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR3004460A1 (fr) * 2013-04-16 2014-10-17 Cba World S A Rl Produit pour l'elimination de residus de sels de calcium insolubles.
EP2792660A1 (fr) * 2013-04-16 2014-10-22 CBA World S.à.r.l. Produit pour l'élimination de résidus de sels de calcium insolubles

Also Published As

Publication number Publication date
EP2439261B1 (fr) 2015-12-02
FR2965817A1 (fr) 2012-04-13
FR2965817B1 (fr) 2012-11-30

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