WO2017167618A1 - Corrosion protection in laundry processes - Google Patents

Corrosion protection in laundry processes Download PDF

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Publication number
WO2017167618A1
WO2017167618A1 PCT/EP2017/056800 EP2017056800W WO2017167618A1 WO 2017167618 A1 WO2017167618 A1 WO 2017167618A1 EP 2017056800 W EP2017056800 W EP 2017056800W WO 2017167618 A1 WO2017167618 A1 WO 2017167618A1
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WIPO (PCT)
Prior art keywords
wash liquor
weight
detergent
acid
triazine derivative
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.)
Ceased
Application number
PCT/EP2017/056800
Other languages
French (fr)
Inventor
Walter Heberlein
Christian Nitsch
Arnd Kessler
Slavoljub Barackov
Ingrid Kraus
Hesham EISSA
Amr DAOUD
Shaimaa ALWAKEL
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
Publication of WO2017167618A1 publication Critical patent/WO2017167618A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • 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
    • C11D3/0005—Other compounding ingredients characterised by their effect
    • C11D3/0073—Anticorrosion compositions
    • 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
    • C11D3/28—Heterocyclic compounds containing nitrogen in the ring
    • 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
    • C23F11/14—Nitrogen-containing compounds
    • C23F11/149—Heterocyclic compounds containing nitrogen as hetero atom

Definitions

  • the present invention relates to the use of s-triazine derivatives as corrosion protective ingredients in aqueous liquors used in laundry processes.
  • sodium chloride is present as a filler substance, due to its availability in large amounts at low costs, or as a carrier material or part of the carrier materials for other detergent ingredients such as enzymes or perfumes.
  • sodium hypochlorite normally in aqueous solution
  • Such chlorine bleach after having oxidized bleachable matter during the process, will in the end result in chloride ions.
  • Chloride ions tend to cause corrosion of metal parts of washing machines, at least after prolonged contact which might result from cumulated use of chlorine bleach or other sources of chloride anions. This corrosive effect might even be increased by the presence of oxidizing agents in the wash liquor.
  • a first aspect of the present invention is the use of an s-triazine derivative, selected from the group of cyanuric acid, its tautomer isocyanuric acid, dichloroisocyanuric acid, their alkali salts, and mixtures thereof, to inhibit corrosion of metal parts of washing machines that come into contact with aqueous wash liquors comprising chloride ions.
  • a second aspect of the invention is a process for washing textiles in an aqueous wash liquor, comprising steps of preparing an aqueous wash liquor that comprises chloride ions in a washing machine, adding an s-triazine derivative, selected from the group of cyanuric acid, its tautomer isocy- anuric acid, dichloroisocyanuric acid, their alkali salts, and mixtures thereof, to said wash liquor, and contacting textiles in need of cleaning with the resulting wash liquor.
  • an s-triazine derivative selected from the group of cyanuric acid, its tautomer isocy- anuric acid, dichloroisocyanuric acid, their alkali salts, and mixtures thereof
  • Parts of washing machines, that are composed of metal and come into contact with the aqueous wash liquor employed in the washing machine, such as heating devices and holders, are protected against corrosion by adding said s-triazine derivatives to the wash liquor. It is also possible to achieve this effect by using a detergent that comprises such a s-triazine derivative to prepare the aqueous wash liquor, by dissolving the detergent in water.
  • the detergent preferably comprises from 0.0001 % by weight to 10 % by weight, in particular from 0.001 % by weight to 1 % by weight, of said s-triazine derivative.
  • chloride salts usually alkali chlorides and among those especially sodium chloride, for example as a filler or carrier material
  • Detergents which can be used to prepare the wash liquor and/or can be used in a process according to the invention preferably are solid, for example in the form of a powder, and/or may comprise up to 10 % by weight, especially of from 0.1 % by weight to 5 % by weight, of chloride (expressed as sodium chloride).
  • an additive to be used in the process to add defined ingredients such as for example optical brighteners, enzymes, bleaches, or perfumes
  • the amount of chloride (expressed as sodium chloride), acting as a carrier for the ingredient might even be higher, for example up to 95 % by weight or even up to 98 % by weight of the composition.
  • the s- triazine derivative may be employed as part of such a detergent or additive composition, or as part of a composition that does not comprise chloride ions; especially the latter compositions may also be liquid at room temperature, and may for example be aqueous solutions of the s-triazine derivatives defined above. It is also possible to impregnate or to coat sheets, especially sheets made from textile materials, with the s-triazine or a detergent comprising the s-triazine and to add such a sheet to the wash liquor.
  • a further embodiment of the invention is a process for washing textiles in an aqueous wash liquor, comprising the steps of preparing an aqueous wash liquor in a washing machine by dissolving a detergent that comprises chloride ions and an s-triazine derivative, selected from the group of cy- anuric acid, its tautomer isocyanuric acid, dichloroisocyanuric acid, their alkali salts, and mixtures thereof, to said wash liquor, and contacting textiles in need of cleaning with said wash liquor.
  • the amount of s-triazine to be added to the wash liquor preferably is in the range of from 0.01 g/l to 1 g/l, in particular from 0.1 g/l to 0.2 g/l.
  • the textiles After contact times preferably in the range of from 1 min to 60 min, in particular from 8 min to 15 min, the textiles might be removed from the wash liquor, for example by taking them out of the washing machine or draining the wash liquor out of the washing machine, rinsed with water, if one so wishes, and dried.
  • Example 1 Powder detergents (% weight):
  • Example 2 Liquid detergents (% by weight)
  • Ci2-i4-fatty alcohol with 7 EO 7 7 7 Ci2-i4-fatty alcohol with 7 EO 7 7 7
  • Example 3 Functional finisher (% by weight):
  • Example 4 Laundry Sheet impregnated with Sodium Isocyanurate (% by weight):

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Organic Chemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Wood Science & Technology (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Detergent Compositions (AREA)
  • Treatments For Attaching Organic Compounds To Fibrous Goods (AREA)

Abstract

The present invention prevents corrosion of metal parts of washing machines by using s-triazine derivatives.

Description

Corrosion protection in laundry processes
The present invention relates to the use of s-triazine derivatives as corrosion protective ingredients in aqueous liquors used in laundry processes.
In some detergent formulations sodium chloride is present as a filler substance, due to its availability in large amounts at low costs, or as a carrier material or part of the carrier materials for other detergent ingredients such as enzymes or perfumes. In some regions as a local washing habit consumers tend to use detergents with a chlorine bleach in textile washing processes, or to add sodium hypochlorite, normally in aqueous solution, to a washing liquor in order to enhance the bleaching and whitening effect on laundry. Such chlorine bleach, after having oxidized bleachable matter during the process, will in the end result in chloride ions.
In some regions water used for textile washing contains considerable amounts of NaCI (sea water or brackish water). So even if a detergent free from NaCI and no chlorine bleach is used, chloride anions are present during the wash process in this case.
Chloride ions tend to cause corrosion of metal parts of washing machines, at least after prolonged contact which might result from cumulated use of chlorine bleach or other sources of chloride anions. This corrosive effect might even be increased by the presence of oxidizing agents in the wash liquor.
Now it has surprisingly been found that the addition of certain s-triazine derivatives to aqueous chloride-containing laundry liquors inhibits corrosion on metal parts of washing machines.
A first aspect of the present invention is the use of an s-triazine derivative, selected from the group of cyanuric acid, its tautomer isocyanuric acid, dichloroisocyanuric acid, their alkali salts, and mixtures thereof, to inhibit corrosion of metal parts of washing machines that come into contact with aqueous wash liquors comprising chloride ions.
A second aspect of the invention is a process for washing textiles in an aqueous wash liquor, comprising steps of preparing an aqueous wash liquor that comprises chloride ions in a washing machine, adding an s-triazine derivative, selected from the group of cyanuric acid, its tautomer isocy- anuric acid, dichloroisocyanuric acid, their alkali salts, and mixtures thereof, to said wash liquor, and contacting textiles in need of cleaning with the resulting wash liquor.
Parts of washing machines, that are composed of metal and come into contact with the aqueous wash liquor employed in the washing machine, such as heating devices and holders, are protected against corrosion by adding said s-triazine derivatives to the wash liquor. It is also possible to achieve this effect by using a detergent that comprises such a s-triazine derivative to prepare the aqueous wash liquor, by dissolving the detergent in water. The detergent preferably comprises from 0.0001 % by weight to 10 % by weight, in particular from 0.001 % by weight to 1 % by weight, of said s-triazine derivative.
Through the invention, it is possible to use chloride salts, usually alkali chlorides and among those especially sodium chloride, for example as a filler or carrier material, in detergents without having to fear that such detergents will cause damage to metal parts of washing machines when used in a laundry process employing such washing machines. Detergents which can be used to prepare the wash liquor and/or can be used in a process according to the invention preferably are solid, for example in the form of a powder, and/or may comprise up to 10 % by weight, especially of from 0.1 % by weight to 5 % by weight, of chloride (expressed as sodium chloride). In case not a fully formulated detergent is contemplated, but an additive to be used in the process to add defined ingredients, such as for example optical brighteners, enzymes, bleaches, or perfumes, the amount of chloride (expressed as sodium chloride), acting as a carrier for the ingredient, might even be higher, for example up to 95 % by weight or even up to 98 % by weight of the composition. The s- triazine derivative may be employed as part of such a detergent or additive composition, or as part of a composition that does not comprise chloride ions; especially the latter compositions may also be liquid at room temperature, and may for example be aqueous solutions of the s-triazine derivatives defined above. It is also possible to impregnate or to coat sheets, especially sheets made from textile materials, with the s-triazine or a detergent comprising the s-triazine and to add such a sheet to the wash liquor.
A further embodiment of the invention is a process for washing textiles in an aqueous wash liquor, comprising the steps of preparing an aqueous wash liquor in a washing machine by dissolving a detergent that comprises chloride ions and an s-triazine derivative, selected from the group of cy- anuric acid, its tautomer isocyanuric acid, dichloroisocyanuric acid, their alkali salts, and mixtures thereof, to said wash liquor, and contacting textiles in need of cleaning with said wash liquor. The amount of s-triazine to be added to the wash liquor preferably is in the range of from 0.01 g/l to 1 g/l, in particular from 0.1 g/l to 0.2 g/l.
After contact times preferably in the range of from 1 min to 60 min, in particular from 8 min to 15 min, the textiles might be removed from the wash liquor, for example by taking them out of the washing machine or draining the wash liquor out of the washing machine, rinsed with water, if one so wishes, and dried.
Examples
Example 1 : Powder detergents (% weight):
Figure imgf000005_0001
Example 2: Liquid detergents (% by weight)
E3 E4 E5
Ci2-i4-fatty alcohol with 7 EO 7 7 7
Ci2-i8-fatty acid, Na-salt 10 10 10
Boric acid 4 4 4
Citric acid 2 2 2
Propanediol 6 6 6
NaOH 3 3 3
Figure imgf000006_0001
Example 3: Functional finisher (% by weight):
Figure imgf000006_0002
Example 4: Laundry Sheet impregnated with Sodium Isocyanurate (% by weight):
E7
Textile Carrier 98
Sodium Isocyanurate 2

Claims

Claims
1. Use of an s-triazine derivative, selected from the group of cyanuric acid, its tautomer isocy- anuric acid, dichloroisocyanuric acid, their alkali salts, and mixtures thereof, to inhibit corrosion of metal parts of washing machines that come into contact with aqueous wash liquors comprising chloride ions.
2. Use according to claim 1 , characterized in that the wash liquor is prepared from a detergent that comprises up to 10 % by weight, especially of from 1 % by weight to 5 % by weight, of chloride.
3. Use according to claim 1 or 2, characterized in that the s-triazine derivative is part of a detergent that is used to prepare the aqueous wash liquor.
4. Use according to claim 3, characterized in that the detergent comprises from 0.0001 % by weight to 10 % by weight, in particular from 0.001 % by weight to 1 % by weight, of the s- triazine derivative.
5. Process for washing textiles in an aqueous wash liquor, comprising steps of preparing an aqueous wash liquor that comprises chloride ions in a washing machine, adding an s-triazine derivative, selected from the group of cyanuric acid, its tautomer isocyanuric acid, dichloroisocyanuric acid, their alkali salts, and mixtures thereof, to said wash liquor, and contacting textiles in need of cleaning with the resulting wash liquor.
6. Process according to claim 5, characterized in that after contact times in the range of from 1 min to 60 min, in particular from 8 min to 15 min, the textiles are removed from the wash liquor, rinsed with water, if one so wishes, and dried.
7. Process according to claim 5 or claim 6, characterized in that the s-triazine derivative is part of a detergent that is used to prepare the aqueous wash liquor.
8. Use according to any of claims 1 to 4, or process according to any of claims 5 to 7, characterized in that the amount of s-triazine added to the wash liquor is in the range of from 0.01 g/l to 1 g/l, in particular from 0.1 g/l to 0.2 g/l.
PCT/EP2017/056800 2016-03-31 2017-03-22 Corrosion protection in laundry processes Ceased WO2017167618A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102016205271.3A DE102016205271A1 (en) 2016-03-31 2016-03-31 Corrosion protection in washing processes
DE102016205271.3 2016-03-31

Publications (1)

Publication Number Publication Date
WO2017167618A1 true WO2017167618A1 (en) 2017-10-05

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WO (1) WO2017167618A1 (en)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3352785A (en) * 1965-06-18 1967-11-14 Fmc Corp Stable dishwashing compositions containing sodium dichloroisocyanurate
US20120094889A1 (en) * 2009-04-11 2012-04-19 Clariant Finance (Bvi) Limited Bleach Granules

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3352785A (en) * 1965-06-18 1967-11-14 Fmc Corp Stable dishwashing compositions containing sodium dichloroisocyanurate
US20120094889A1 (en) * 2009-04-11 2012-04-19 Clariant Finance (Bvi) Limited Bleach Granules

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