CN116745398A - Washing liquid for washing tableware of professional machine - Google Patents

Washing liquid for washing tableware of professional machine Download PDF

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Publication number
CN116745398A
CN116745398A CN202280012280.0A CN202280012280A CN116745398A CN 116745398 A CN116745398 A CN 116745398A CN 202280012280 A CN202280012280 A CN 202280012280A CN 116745398 A CN116745398 A CN 116745398A
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CN
China
Prior art keywords
professional
detergent
machine dishwashing
liquid
alkali metal
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CN202280012280.0A
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Chinese (zh)
Inventor
L·E·戴维斯-麦格拉
M·米克斯特罗·塞拉斯奎罗
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Unilever IP Holdings BV
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Unilever IP Holdings BV
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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
    • C11D3/0026—Low foaming or foam regulating 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
    • C11D7/00—Compositions of detergents based essentially on non-surface-active compounds
    • C11D7/02—Inorganic compounds
    • C11D7/04—Water-soluble compounds
    • C11D7/06—Hydroxides
    • 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
    • C11D7/10—Salts
    • C11D7/14—Silicates
    • C11D2111/20—

Abstract

An aqueous liquid professional machine dishwashing detergent comprising from 10 wt% to 40 wt% alkali metal hydroxide; and 0.1 to 10 wt% alkali metal silicate; and up to 5 wt% of a bleach activator; and up to 0.5 wt% of a bleach catalyst; and up to 0.1 wt% enzyme; and up to 1 wt% phosphate; and optionally, a builder; and optionally, a surfactant; and wherein a 1 wt% solution of the detergent in water provides a pH of at least 10.5 at 25 degrees celsius and under otherwise standard conditions.

Description

Washing liquid for washing tableware of professional machine
Technical Field
The present invention relates to an aqueous liquid detergent for professional machine dishwashing machines which provides reduced sudsing. The invention also relates to a method for professional machine dishwashing.
Background
Professional machine dishwasher machines are different from domestic dishwasher machines and are used, for example, in restaurants and in restaurants in office buildings, factories, schools, etc. Such machines require high throughput and must be able to clean large numbers of dishes effectively in a short period of time. To achieve this, they tend to operate at high wash temperatures, with very short total wash cycle times, typically no more than 15 minutes. Such machines require specialized detergent products to effectively clean large amounts of (dish) ware in such short periods of time. The detergent product itself is also sold in bulk containers which are ideally self-feeding (e.g. liquid). Detergent products tend to provide a fairly high main wash alkalinity and are generally considered unsuitable for domestic use from a safety standpoint.
One recurring problem when using detergents in professional dish washing machines is the problem of foam formation. Foaming may be caused by a number of factors. One is the saponification of the fat during the washing process due to the high temperature and high alkaline conditions in the washing. Another possibility is to source the circulating rinse water for a subsequent main wash cycle with excess surfactant present in the rinse agent.
As consumers of professional machine dishwashing detergents wish to obtain products with less environmental impact and a shorter list of ingredients, finding a suitable solution to the problem of foaming becomes more challenging.
It is therefore an object of the present invention to provide an aqueous liquid detergent suitable for professional machine dishwashing machines, which has improved anti-foaming properties, preferably with a short list of ingredients and/or with a low or reduced environmental impact.
Disclosure of Invention
The object of the invention is achieved in a first aspect by an aqueous liquid professional machine dishwashing detergent comprising
10 to 40 wt.% of an alkali metal hydroxide; and
0.1 to 10% by weight of an alkali metal silicate; and
up to 5 wt% of a bleach activator; and
up to 0.5 wt% of a bleach catalyst; and
up to 0.1 wt.% enzyme; and
up to 1 wt% phosphate; and
optionally, a builder; and
optionally, a surfactant; and is also provided with
Wherein a 1 wt% solution of the detergent in water provides a pH of at least 10.5 at 25 degrees celsius and under otherwise standard conditions.
Surprisingly, it has been observed that the use of alkali metal silicate salts, especially in professional machine dishwashing detergents, can reduce foaming problems. In particular, it was observed that the alkali silicate present in an amount of 0.1 to 10 wt.% resulted in faster dissipation of any foam formed. Furthermore, it has unexpectedly been observed that effective cleaning of dishes in professional dish washing machines can be achieved with little or no use of enzymes, bleach catalysts, bleach activators and surfactants.
The invention in another aspect relates to a professional method for machine dishwashing comprising the steps of:
adding 1 to 10ml of the liquid detergent according to any of the preceding claims per liter of total water used in the main wash of a professional dishwasher;
in the main wash cleaning step, cleaning the dishes at a water temperature of at least 60 ℃; and
a rinsing step of the cutlery at a temperature of at least 60 degrees celsius.
In a further aspect, the invention relates to the use of alkali metal silicate to reduce sudsing in liquid detergents suitable for professional machine dishwashing. Indeed, to the inventors' knowledge, the anti-foaming properties of alkali metal silicates have not been recognized in the art of professional machine dishwashing. The invention therefore also relates to the use of alkali metal silicate for reducing foaming in professional machine dishwashing processes.
Detailed Description
Definition of the definition
Weight percentages (wt.%) are based on the total weight of the detergent composition, unless otherwise indicated or clear from the context. It should be understood that the total weight of the ingredients is not more than 100% by weight. Whenever an amount or concentration of a component is quantified herein, unless otherwise indicated, even if it is common practice to add such component in the form of a solution or blend with one or more other ingredients, the quantified amount or quantified concentration refers to the component itself. Furthermore, it will be understood that the verb "to comprise" and its conjugations is used in its non-limiting sense to mean that items following the word are included, but items not specifically mentioned are not excluded. Finally, references to an element by the indefinite article "a" or "an" do not exclude the possibility that more than one element is present, unless the context clearly requires that there be one and only one element. Thus, the indefinite article "a" or "an" generally means "at least one". All measurements were performed under standard conditions unless otherwise indicated. Whenever a parameter (e.g., concentration or ratio) is considered to be less than a certain upper limit, it is understood that the lower limit of the parameter is 0 in the absence of a specified lower limit.
Alkali metal silicate
The professional machine dishwashing detergent according to the invention comprises from 0.1 to 10% by weight of alkali metal silicate. More advantageous amounts are from 0.5 to 7% by weight, even more preferably from 1.0 to 5% by weight, still even more preferably from 1.5 to 3.5% by weight. In order of preference, it was observed that the more preferred amounts provided improved optimisation between anti-foaming capacity and formulation stability. In particular, higher amounts of alkali metal silicate have a greater tendency to precipitate from the liquid.
Sodium silicate is a sodium silicate having formula Na 2x Si y O 2y+x Or (Na) 2 O) x ·(SiO 2 ) y Generic names of compounds such as sodium metasilicate Na 2 SiO 3 Sodium orthosilicate Na 4 SiO 4 And sodium disilicate Na 6 Si 2 O 7 . The anions are typically polymeric. These compounds are generally colorlessTransparent solid or white powder, and is soluble in water in various amounts. Sodium silicate is also a technical and common name for mixtures of these compounds, mainly metasilicate, also known as water glass, water glass or liquid glass.
Silicate salts which are advantageously used in the detergent compositions of the invention are characterized by the general formula SiO 2 :M 2 O, wherein "M" represents an alkali metal atom. "M" is typically Na, K or Li. In industry, various grades of alkali metal silicates are characterized by their SiO 2 :M 2 O weight ratio. The ratio may be at 0.5 (i.e., siO 2 Weight relative to M 2 Half of the weight of O) and 4 (i.e., siO 2 Weight relative to M 2 Four times the weight of O). When alkali metal silicates of this formula are used, preferably in detergents, and advantageously with a ratio of 1.0 to 3.5, more preferably a ratio of 1.5 to 3.0, the best results in optimizing anti-foaming and detergent stability are found. The alkali metal may be based on potassium or sodium, with sodium being the more preferred alkali metal species.
Alkali metal hydroxide
Professional machine dishwashing detergents contain relatively large amounts of alkali metal hydroxide to provide fairly alkaline wash liquor conditions in the main wash. Preferred alkali metal hydroxides are selected from sodium hydroxide, potassium hydroxide, and combinations thereof. The amount of alkali metal hydroxide in the detergent composition of the present invention is 10-40 wt%, preferably 12-30 wt%, more preferably 13-25 wt%, even more preferably 15-20 wt%.
Bleaching agent
The detergents of the invention preferably comprise from 1 to 25 wt%, more preferably from 5 to 20 wt%, even more preferably from 8 to 15 wt% of bleach. Inorganic and/or organic bleaching agents may be used. The bleaching agent may be selected from the group consisting of peroxides, organic peracids, salts of organic peracids, and combinations thereof.
Examples of peroxides are monopersulfates, perborate monohydrate, perborate tetrahydrate and percarbonate acids and the corresponding salts. Organic peracids useful in the present invention include alkyl and aryl peroxy acids, such as peroxybenzoic acid and ring-substituted peroxybenzoic acids (e.g., peroxy- α -naphthoic acid), aliphatic and substituted aliphatic monoperoxyacids (e.g., peroxylauric acid and peroxystearic acid), and phthalimido Peroxycaproic Acid (PAP). Typical diperoxy acids useful herein include alkyl diperoxy acids and aryl diperoxy acids such as 1, 12-diperoxydodecanedioic acid (DPDA), 1, 9-diperoxyazelaic acid, diperoxybutyric acid, diperoxybebacic acid, and diperoxydisphthalic acid, and 2-decyl diperoxybutane-1, 4-diacid.
Preferably, the bleaching agent is selected from the group consisting of peroxides (including peroxide salts such as sodium percarbonate), organic peracids, salts of organic peracids, and combinations thereof. More preferably, the bleaching agent is a peroxide. Most preferably, the bleaching agent is percarbonate. Further preferably, the bleaching agent is a coated percarbonate.
Bleaching activator
The detergents of the invention may contain one or more bleach activators such as peroxyacid bleach precursors. Peroxyacid bleach precursors are well known in the art. As non-limiting examples, mention may be made of N, N' -tetraacetylethylene diamine (TAED), sodium nonanoyloxybenzene sulfonate (SNOBS), sodium benzoyloxybenzene sulfonate (SBOBS) and cationic peroxyacid precursor (SPCC), as described in US-se:Sup>A-4,751,015. However, the detergent of the present invention preferably comprises up to 5 wt% of bleach activator, more preferably up to 3 wt%, even more preferably up to 2 wt%, still even more preferably up to 1 wt%. Advantageously, the detergent composition contains substantially no bleach activator. In particular, the presence of bleach activators has been found to provide little or no further cleaning effect for the cleaning of dishes in professional dish washing machines. Thus, it has surprisingly been found that the absence of bleach activator enables the ingredient list to be kept shorter without having a too great impact on the cleaning efficiency of professional machine dishwashing detergent compositions.
Bleaching catalyst
Bleach catalysts generally function by oxidation of peroxides or peracids to form bleaching species. They require the presence of oxidizable soils so that they can be reduced back to the original bleach activator state.
Suitable bleach catalysts are manganese complexes of formula (a):
[L n Mn m X p ] z Y q
wherein Mn is manganese, which may be in the II, III, IV or V oxidation state or mixtures thereof; n and m are independent integers from 1 to 4; x represents a coordinating or bridging substance; p is an integer of 0 to 12; y is a counter ion, the type of which depends on the charge z of the complex, which may be positive, zero or negative; q=z/[ charge Y ]; and L is a ligand which is a macrocyclic organic molecule having the general formula:
wherein R is 1 And R is 2 May each be zero, H, optionally substituted alkyl or aryl; t and t' are each an independent integer from 2 to 3; each D may independently be N, NR, PR, O or S, wherein R is H, alkyl or aryl, optionally substituted; and s is an integer of 2 to 5.
Such bleach catalysts are described in EP0458397 A2. Preferred features of the manganese-based bleach catalysts described therein are preferably used in any of the manganese-based bleach catalysts used in the detergents of the present invention. Preferred features mentioned are those mentioned in connection with the manganese-based bleach catalysts on pages 3 to 8 of EP0458397A 2.
The amount of bleach catalyst in the detergent compositions of the present invention is up to 0.5 wt%. However, the detergent composition of the present invention preferably comprises at most 0.1 wt%, more preferably at most 0.05 wt%, even more preferably at most 0.01 wt%, yet even more preferably at most 0.001 wt% of bleach catalyst. Advantageously, the detergent composition is substantially free of bleach catalyst. In particular, the presence of bleach catalysts has been found to provide little or no further cleaning effect for the cleaning of dishes in professional dish washing machines. It has thus surprisingly been found that the absence of bleach catalyst enables the list of ingredients to be kept short without having a too great impact on the cleaning efficiency of professional machine dishwashing detergents. Furthermore, bleach catalysts are generally poorly biodegradable, so having a reduced (or even no) amount of bleach catalyst can further reduce the environmental impact of the detergent according to the present invention.
Surface active agent
The detergent of the present invention may comprise a surfactant. The nonionic and anionic surfactants of the surfactant system may be selected from the group consisting of surfactants described in "Surface Active Agents", first volume of Schwartz & Perry, interscience 1949, second volume of Schwartz, perry & Berch, interscience 1958, current versions "McCutcheon's Emulsifiers and Detergents" published by Manufacturing Confectioners Company or "Tenside-Taschenbuch", H.Stache,2nd Edn., carl Hauser Verlag, 1981. Preferably the surfactant used is saturated.
Nonionic surfactant
The detergent according to the present invention may comprise 0.1 to 15 wt% of a nonionic surfactant or a mixture of two or more nonionic surfactants. If a nonionic surfactant is present, a combination of at least two nonionic surfactants is advantageously used. Examples of nonionic surfactants that may be used include condensation products of hydrophobic alkyl, alkenyl, or alkylaromatic compounds bearing a functional group with free active hydrogen, which may be used to condense with hydrophilic alkylene oxides (e.g., ethylene oxide, propylene oxide, butylene oxide, polyethylene oxide, or polyethylene glycol) to form nonionic surfactants. Examples of such functional groups include hydroxyl, carboxyl, sulfhydryl, amino or amido groups. Examples of useful hydrophobes of commercially available nonionic surfactants include C8-C18 alkyl fatty alcohols, C8-C14 alkyl phenols, C8-C18 alkyl fatty acids, C8-C18 alkyl thiols, C8-C18 alkyl fatty amines, C8-C18 alkyl amides, and C8-C18 alkyl fatty alkanolamides. Thus, suitable ethoxylated fatty alcohols may be selected from ethoxylated cetyl alcohol, ethoxylated ketostearyl alcohol, ethoxylated isotridecyl alcoholAlkanol, ethoxylated lauryl alcohol, ethoxylated oleyl alcohol, and mixtures thereof. Examples of suitable nonionic surfactants for use in the present invention can be found in Plurafac provided by BASF TM LF series and Synpronic supplied by Croda TM The NCA series was low foaming into unfoamed ethoxylated/propoxylated linear alcohols. Also of interest are the blocked ethoxylated alcohols supplied by BASF as the SLF18 series and from Lutensol supplied by BASF TM Alkyl polyglycol ethers prepared from linear saturated C16-C18 fatty alcohols of the AT series. Other suitable nonionic surfactants for use in the compositions of the present invention are those available from BASF/Cognis as Dehypon TM E127、Dehypon TM 3697GRA or Dehypon TM Modified fatty alcohol polyglycol ether obtained by Wet. Also suitable for use in the present invention are the Lutensol of BASF TM TO series of nonionic surfactants, which are alkyl polyglycol ethers prepared from saturated iso-C13 alcohols.
Amine oxide surfactants may also be used as anti-redeposition surfactants in the present invention. Examples of suitable amine oxide surfactants are C10-C18 alkyl dimethylamine oxide and C10-C18 amidoalkyl dimethylamine oxide.
Anionic surfactants
If anionic surfactants are used, the total amount present is preferably less than 5% by weight, more preferably not more than 2% by weight. Examples of suitable anionic surfactants are methyl ester sulfonates or sodium lauryl sulfate.
The total amount of surfactant in the detergent composition of the present invention is preferably at most 5 wt%, more preferably at most 3.0 wt%, even more preferably at most 1.5 wt%, yet even more preferably at most 1.0 wt%, yet even more preferably at most 0.5 wt%. Advantageously, the detergent according to the invention comprises substantially no surfactant. In particular, the presence of surfactants has been found to provide little or no further cleaning effect for the cleaning of dishes in professional dish washing machines. Thus, it has surprisingly been found that the absence of a surfactant enables the list of ingredients to be kept short without having a too great impact on the cleaning efficiency of a professional machine dishwashing detergent composition. Furthermore, most existing surfactants are not derived from renewable resources and/or are poorly biodegradable. Having a reduced (or even no) amount of surfactant can therefore further reduce the environmental impact of the detergent compositions of the present invention.
Enzymes
The professional detergent composition according to the invention may comprise enzymes. Examples of enzymes suitable for use in the cleaning compositions of the present invention include lipases, cellulases, peroxidases, proteases (proteolytic enzymes), amylases (amylolytic enzymes), and the like. Well known and preferred examples of such enzymes are proteases, amylases, cellulases, peroxidases, mannanases, pectate lyases and lipases and combinations thereof. Enzymes most commonly used in detergent compositions are proteolytic and amylolytic enzymes. The enzyme may be added in liquid or encapsulated form. In a preferred embodiment of the invention, the enzyme is present in encapsulated form. Well known enzyme stabilizers such as polyol/borax, calcium, formate or protease inhibitors such as 4-formylphenyl boronic acid may also be present in the composition.
Suitable levels of protease are from 0.1 to 10mg, more preferably from 0.2 to 5mg, most preferably from 0.4 to about 4mg of active protease per gram of detergent composition. Preferred levels of amylase are from 0.01 to 5mg, more preferably from 0.02 to 2mg, most preferably from 0.05 to about 1mg of active amylase per gram of detergent composition.
However, it has been found that the addition of enzymes to detergents according to the invention provides little or no additional cleaning benefit when used in professional machine dishwashing machines. Thus, advantageously, the detergent according to the invention is substantially free of enzymes, which will further help to provide a shorter list of ingredients.
Dispersing polymers
The detergent composition according to the present invention may comprise a dispersing polymer. The dispersing polymer is advantageously selected from anti-spotting agents and/or anti-fouling agents. Examples of suitable polymeric anti-spotting agents include hydrophobically modified polycarboxylic acids, such as Acusol TM 460 ND (from Dow) and NouryonAlcosperse TM 747, while synthetic clays, preferably those having a high surface area, can also be used to reduce speckle, particularly speckle that forms in the presence of dirt and dispersed residues where water collects on the glass, and speckle that forms when water subsequently evaporates.
Suitable anti-kogation agents are water soluble dispersion polymers prepared from allyloxybenzenesulfonic acid monomers, methallylsulfonic acid monomers, copolymerizable nonionic monomers and copolymerizable ethylenically unsaturated carboxylic acid monomers, as described in US5547612, or referred to as acrylic sulfonated polymers, as described in EP 851022. Polymers of this type include polyacrylates with methyl methacrylate, sodium methallylsulfonate and sulfophenol methallylether, e.g. Alcosperse TM 240 (Nouryon). Also suitable are terpolymers comprising polyacrylate with 2-acrylamido-2-methylpropanesulfonic acid, such as Acumer3100 supplied by Dow. Alternatively, polymers and copolymers of acrylic acid having a molecular weight between 500 and 20,000, such as homo-polycarboxylic acid compounds having acrylic acid as monomer unit, may also be used. The average weight of the homopolymers in the acid form is preferably in the range from 1,000 to 100,000, in particular from 3,000 to 10,000, for example Sokolan of BASF TM Acusol of PA 25 or Dow TM 425. Also suitable are polycarboxylate copolymers derived from monomers of acrylic acid and maleic acid, such as CP5 of BASF. The average molecular weight of these polymers in acid form is preferably in the range of 4,000 to 70,000. Modified polycarboxylates, e.g. Sokalan of BASF, may also be used TM Alcoguard of CP50 or Nouryon TM 4160. Mixtures of anti-fouling agents may also be used. Particularly useful are mixtures of organic phosphonates and acrylic polymers.
It is preferred that the content of the dispersing polymer is at most 6 wt%, more preferably at most 5 wt%, even more preferably at most 4 wt%, with suitable lower contents being at least 0.1 wt%, at least 0.5 wt% and 1.0 wt%. Advantageously, however, the detergent according to the invention comprises substantially no dispersing polymer. This is because it was found that adding these polymers provides little or no additional benefit when the detergent is used in a professional machine dishwasher. Therefore, in order to keep the list of ingredients as short as possible and further reduce the amount of poorly biodegradable ingredients in the composition, the detergent according to the invention preferably contains substantially no dispersing polymer.
Surprisingly, it has been found that anti-scaling agents that provide significant cleaning benefits in professional machine dishwashing processes are organic phosphonates, amino carboxylates, polyfunctional substituted compounds and mixtures thereof. Particularly preferred anti-fouling agents are organic phosphonates, such as alpha-hydroxy-2-phenylethyl bisphosphonate, ethylene bisphosphonate, hydroxy-1, 1-hexylene, vinylidene-1, 1-bisphosphonate, 1, 2-dihydroxyethane 1, 1-bisphosphonate and hydroxy-ethylene 1, 1-bisphosphonate. Most preferred are hydroxy-ethylene 1, 1-bisphosphonates (HEDP) and 2-phosphono-butanes, 1,2, 4-tricarboxylic acid (Bayhibit, from Bayer). Hydroxy-ethylene 1, 1-bisphosphonates are sometimes also abbreviated as EHDP.
The detergent according to the invention advantageously comprises from 0.1 to 5% by weight, more preferably from 0.5 to 4% by weight, even more preferably from 1.0 to 3.0% by weight, and still more advantageously from 1.5 to 2.5% by weight of HEDP.
Glass corrosion inhibitors and antitarnish agents
Glass corrosion inhibitors can prevent irreversible corrosion and iridescence of glass surfaces in machine dishwashing detergents. The claimed compositions may suitably contain a glass corrosion inhibitor. Suitable glass etchants may be selected from zinc salts, bismuth salts, aluminum salts, tin salts, magnesium salts, calcium salts, strontium salts, titanium salts, zirconium salts, manganese salts, lanthanum salts, mixtures thereof, and precursors thereof. Most preferred are bismuth, magnesium, or zinc salts, or combinations thereof. The generally preferred content of glass corrosion inhibitor in the composition of the present invention is from 0.01 to 2% by weight, more preferably from 0.01 to 0.5% by weight. The antitarnish agent can prevent or reduce rust, corrosion or oxidation of metals such as silver, copper, aluminum and stainless steel. Antitarnish agents such as benzotriazole or bisbenzotriazole and substituted or substituted derivatives thereof and those described in EP723577 (Unilever) may also be included in the composition. Other antitarnish agents which may be included in the detergent compositions are mentioned in WO94/26860 and WO 94/26859. Suitable redox activators are, for example, complexes selected from cerium, cobalt, hafnium, gallium, manganese, titanium, vanadium, zinc or zirconium, in which the metal is in the oxidation state II, II, IV, V or VI.
The detergent composition is preferably free of zinc and/or bismuth in view of reducing the environmental impact of the detergent composition of the present invention. In the context of the present invention, alkali metal silicates are not considered as glass corrosion inhibitors or antitarnish agents.
Builder agent
The builder material may be selected from 1) calcium chelating materials, 2) precipitation materials, 3) calcium ion exchange materials, and 4) mixtures thereof. The water used to provide the wash liquor in a dishwasher typically contains calcium, magnesium and metal cations (iron, copper and manganese). Builders typically remove hard water ions by precipitation, chelation or ion exchange. In addition, they assist in the removal of soil by dispersion. In view of the aqueous liquid detergents of the invention, the beneficial amount of builder is 2 to 30 wt.%, more preferably 4 to 15 wt.%, even more preferably 5 to 12 wt.%, still even more preferably 6.0 to 10 wt.%.
Examples of precipitated builder materials include sodium carbonate. Examples of calcium ion-exchange builder materials include various types of water-insoluble crystalline or amorphous aluminosilicates, of which zeolites are the best known representatives, such as zeolite a, zeolite B (also known as zeolite P), zeolite C, zeolite X, zeolite Y and zeolite P-type as described in EP-a-0,384,070. Zeolite and carbonate, carbonate (including bicarbonate and sesquicarbonate)) are preferred builders, with carbonate being more preferred.
The detergent may contain crystalline aluminosilicate as a builder, preferably alkali metal aluminosilicate, more preferably sodium aluminosilicate. It is generally present in an amount of less than 15% by weight. Aluminosilicates are materials having the general formula:
0.8-1.5M 2 O.Al 2 O 3 .0.8-6SiO 2
wherein M is a monovalent cation, preferably sodium. These materials contain some bound water and requireHas a calcium ion exchange capacity of at least 50mg CaO/g. Preferred sodium aluminosilicates contain 1.5 to 3.5 SiO's in the above formula 2 A unit. They can be readily prepared by the reaction between sodium silicate and sodium aluminate, as fully described in the literature. The ratio of surfactant to aluminosilicate (when present) is preferably greater than 5:2, more preferably greater than 3:1.
Alternatively or in addition to aluminosilicate builders, phosphate builders can be used. In the art, the term "phosphate" includes the di-, tri-and phosphonate species. Preferably, the machine dishwashing detergent is non-phosphate-assisted (i.e., contains less than 1 wt% phosphate). Preferably, the detergent composition according to the invention comprises substantially no di-and/or tri-phosphates.
Amino polycarboxylates are well known in the detergent industry and are sometimes referred to as aminocarboxylate chelants. They are generally considered strong builders. Examples include glutamic acid N, N-diacetic acid (GLDA), methylglycine diacetic acid (MGDA), ethylenediamine disuccinic acid (EDDS), iminodisuccinic acid (IDS), iminodisuccinic acid (IDM), nitrilotriacetic acid (NTA), iminodiacetic acid (IDA), hydroxyethyiminodiacetic acid (HEIDA), aspartic acid diethoxy succinic Acid (AES), aspartic acid-N, N-diacetic acid (ASDA), hydroxyethylene-diamine tetraacetic acid (HEDTA), hydroxyethylene-diamine triacetic acid (HEEDTA), iminodif-fumaric acid (IDF), iminoditartaric acid (IDT), iminodimaleic acid (IDMAL), ethylenediamine disuccinic acid (EDDF), ethylenediamine disuccinic acid (EDDT), ethylenediamine dimaleic acid (EDDMAL) and pyridine dicarboxylic acid.
Preferred aminopolycarboxylate builders are GLDA, MGDA and/or EDDS, with GLDA and MGDA being more preferred and GLDA even more preferred. In particular, GLDA can be dissolved in large amounts in detergent products while maintaining good pourability, thus making the product more suitable for use in automatic-feeding machine dishwashing systems.
In the context of the present invention, alkali metal silicate is not considered a builder.
Perfume and colorant
The detergent according to the present invention may comprise one or more colorants, fragrances or mixtures thereof. The colorant is advantageously present in an amount of from 0.0001 to 8% by weight, more preferably from 0.001 to 4% by weight, even more preferably from 0.001 to 1.5% by weight.
The perfume may be present in the range of 0.1 to 1 wt%. Many suitable examples of fragrances are provided in CTFA (society for cosmetics, toiletries and fragrances) 1992 international buyer guidelines published by CFTA Publications and OPD 1993 chemical buyer catalogs edition 80 published by Schnell Publishing Co. Preferably 15 to 25% by weight of the perfume mixture is a top note. The top note is defined by Poucher (Journal of the Society of Cosmetic Chemists 6 (2): 80[1955 ]). Preferred top notes are selected from citrus oils, linalool, linalyl acetate, lavender, dihydromyrcenol, rose ethers and cis-3-hexanol. However, it is notable that another typical distinction between household and professional machine dishwashing detergents is that perfumes in the latter are generally not preferred. Thus, it is preferred that perfume be substantially absent from the detergents of the invention. The absence of perfume added to the detergents of the present invention further helps to reduce the number of ingredients.
Forms of detergent products
The professional machine dishwashing detergent product of the present invention is in the form of a pourable aqueous liquid. Thus, the preferred amount of water is 40-90 wt%, more preferably 50-85 wt%, even more preferably 55-80 wt%, yet even more preferably 60-75 wt%. The amount of such water refers to the total amount of water in the detergent product, regardless of how it is added (e.g., added as pure water or present as part of the added ingredient composition).
In view of the short wash cycle times of professional machine dishwasher, highly alkaline washing solutions are very important for adequate cleaning of the dishes. Thus, the detergent composition of the present invention is such that a pH of at least 10.5 is provided when a 1 wt% aqueous solution of detergent is provided at 25 degrees celsius and under otherwise standard conditions. Preferably, the pH is from 11.0 to 14.5, more preferably from 11.5 to 14.0, even more preferably from 12.0 to 13.8, and advantageously from 12.2 to 13.5.
Professional machine dishwashing machines are required to process a large number of dishes to be cleaned in a short period of time. Thus, to achieve this, it is important that the detergent according to the invention is packaged in a relatively large volume (e.g. as compared to conventional household detergent packages). This reduces the likelihood of empty detergent packages during peaks of machine dishwashing activity. It is therefore very advantageous that the detergent according to the invention is packaged in a container having 1 to 50 litres, preferably 2 to 30 litres, more preferably 4 to 20 litres, even more preferably 8 to 15 litres of detergent liquid.
As previously mentioned, many professional dishwasher machines automatically choose to automatically feed liquid detergent. This not only saves the user time, who no longer needs time to charge the detergent between each successive wash cycle, but is also important from a safety point of view. As mentioned above, professional machine dishwashing detergents themselves tend to be more alkaline than household detergents, and thus skin contact with professional machine dishwashing detergents can be more dangerous. Thus, advantageously, the machine dishwashing detergent according to the invention is packaged in bottles suitably adapted for automatic feeding.
The preferred form of packaging is in the form of a bottle container, more preferably with a pouring spout. It is further advantageous to have a container (preferably a bottle) with a gripping handle. This facilitates transport (as the detergent is typically packaged in large volumes) and further reduces the likelihood of accidental spillage and skin contact.
As indicated, the present invention is in part a recognition that several ingredients known for household dishwashing detergents provide little or no additional benefit when used in professional dishwashing machines. This discovery advantageously enables further optimisation of the detergent according to the invention by limiting the amount of ingredients, whilst still providing equivalent cleaning efficacy. Limiting the amount of ingredients in a detergent composition is not only beneficial from a consumer perspective, but is also beneficial in a sense that it makes the production of detergents less technically complex. It further enhances overall detergent stability, as fewer interactions (chemical or otherwise) may occur if fewer ingredients are present. Preferably, the detergent composition contains (for calculation purposes excluding water, dyes and perfumes) up to 8, more preferably up to 6, even more preferably up to 5, still more advantageously up to 4 ingredients.
Professional tableware washing method
One aspect of the invention relates to a professional method for machine dishwashing comprising the steps of:
adding 1 to 10ml of liquid detergent according to any of the preceding claims per liter of total water used in the main wash of a professional dishwasher;
in the main wash cleaning step, cleaning the dishes at a water temperature of at least 60 ℃; and
a rinsing step of the cutlery at a temperature of at least 60 degrees celsius.
It should be understood that the method steps are performed in this order.
Professional dishwasher machines are different from those used in the domestic case. Professional dish washing machines are designed for peak dish washing demands and should be capable of washing at least 100, preferably 200, more preferably 500, even more preferably at least 800 dishes per hour. Another conventional way of assessing throughput is based on the number of racks that can be washed by a professional dishwasher per hour. The professional dishwasher is preferably capable of washing at least 10 racks/hour, more preferably at least 20 racks/hour, even more preferably at least 50 racks/hour, still even more preferably at least 100 racks/hour.
A typical difference between household and professional dishwasher is that the latter usually does not use an active drying step. Vessel drying in professional machines is typically achieved by exposing the hot vessel to open air. This may reduce the time before another batch of cutlery can be loaded into the machine. Thus, preferably, the method for a professional dishwasher according to the invention does not comprise an active drying step. Active drying can be achieved by actively circulating hot air in the still closed washing chamber of the dishwasher. Thus, a preferred method according to the invention comprises a passive drying step, which advantageously comprises exposing the hot vessel to open air. "hot ware" means that the temperature of the ware is above ambient temperature and typically at least 50 degrees celsius above the moment the ware washing machine is turned on.
The main wash cycle is carried out at a relatively high temperature of at least 60 degrees celsius, but preferably in the range of from 62 to 90 degrees celsius, more preferably in the range of from 63 to 87 degrees celsius, even more preferably in the range of from 65 to 85 degrees celsius, still even more preferably in the range of from 70 to 80 degrees celsius.
Furthermore, the rinse cycle in professional machines is also typically carried out at a fairly high temperature, which is at least 60 ℃, but preferably in the range of 62 to 90 ℃, more preferably 63 to 87 ℃, even more preferably 65 to 85 ℃, still even more preferably 70 to 80 ℃. It is also preferred that the rinse cycle involves steam at least at some points of the cycle to further assist in drying the ware upon subsequent exposure to open air.
The length of the respective cycle times of the professional dishwasher for the main wash time and the rinse cycle time may vary. Preferably, each independently is at most 10 minutes, at most 8 minutes, at most 6 minutes, at most 5 minutes, at most 3 minutes, even more preferably at most 2 minutes. The total warewash time (including the main and rinse cycles) is preferably at most 15 minutes, more preferably at most 10 minutes, at most 8 minutes, at most 6 minutes, at most 5 minutes, at most 3 minutes, even more preferably at most 2 minutes. In general, the shorter the cycle time, the more preferred this is for a professional dishwasher.
A further feature of professional dish washing machines is their relatively low water/dish ratio. This has the advantage of reducing the amount of water used, but also saves energy in heating the water. One way to achieve this is to recycle the rinse water as the water for the main wash. However, since the rinse water typically contains a surfactant as a desiccant, this can exacerbate any foaming problems. Of course, the short wash cycle time and the general absence of an active drying step means that there is generally a tendency for surfactants to be present in the main wash cycle, even if surfactants are not present in the neat detergent composition.
In order to combine a short warewashing time with an overall warethroughput, the professional machine is preferably provided with a main wash liquor reservoir adapted to supply wash liquor for multiple washings and/or an automatic feed system for the detergent.
Use of alkali metal silicate
In another aspect the invention relates to the use of alkali metal silicate to reduce sudsing in liquid detergents suitable for professional machine dishwashing.
Although alkali metal silicates are known as dish protection agents in household detergents, their use in professional machines is not known. In particular, cutlery used in restaurants, for example, is generally less susceptible to corrosion in design and therefore requires little inclusion of an anti-corrosion agent in a professional machine dishwashing detergent. Furthermore, their anti-foaming activity is unexpected, let alone in the operating situation of professional machine dishwashing machines.
The invention therefore also relates to the use of alkali metal silicate to reduce foaming in professional machine dishwashing processes.
The preferred embodiments mentioned for one aspect of the present invention apply mutatis mutandis to other aspects of the present invention, unless otherwise stated or apparent from the context of the specification. The following examples are intended to be illustrative and not limiting.
Examples
Example 1
Professional machine dishwashing detergents were prepared with the compositions listed in table 1 below, wherein the composition of example 1 was according to the invention, whereas the composition of comparative example 1 was not.
Table 1-composition of professional machine dishwashing detergent. The amounts are shown as wt% active based on total detergent weight.
Composition of the components Example 1 Comparative example 1
GLDA 7.3 7.3
NaOH 17.5 17.5
HEDP 1.4 1.4
1 Sodium silicate 5.0 0
Dye 0.0025 0.0025
Demineralized water Allowance of Allowance of
1 Added as sodium silicate salt (CAS No: 1344-09-8).
Method for testing foam forming effect
The detergents according to Table 1 were mixed with water in an amount of 4 ml/L. Rinse aid product (having the formulation in Table 2) was then also added at a concentration of 4 ml/L. The resulting mixture was placed in a 1000ml volume plastic cartridge. The top of the cartridge was sealed and the cartridge was flipped 15 times. At the end of this inversion process, approximately the same amount of foam was produced for each composition tested. The rate of dissipation of the foam column in the cylinder was tracked over time, the results of which are given in table 3.
Table 2: rinse aid formulation compositions. The amounts are given in weight% active based on the weight of the total rinse aid composition.
Composition of the components
Citric acid 4.0
1 Plurfac LF300 7.3
Sodium xylene sulfonate 5.0
NaOH 0.125
Demineralized water Allowance of
1 Plurafac LF300: fatty alcohol alkoxylate nonionic surfactant (vendor: BASF)
Table 3: foam consumption over time, wherein foam height is given as% relative to the initial foam height (which is set to 100%).
From the results, it can be seen that the example 1 composition comprising 5 wt% sodium disilicate effectively reduced any initial foam formation at a much faster rate than the comparative composition that did not comprise any sodium silicate. This is very advantageous for professional dish washing machines, as they use very short cycle times to accommodate high dish throughput.

Claims (15)

1. An aqueous liquid professional machine dishwashing detergent comprising
10 to 40 wt.% of an alkali metal hydroxide; and
0.1 to 10% by weight of an alkali metal silicate; and
up to 5 wt% of a bleach activator; and
up to 0.5 wt% of a bleach catalyst; and
up to 0.1 wt.% enzyme; and
up to 1 wt% phosphate; and
optionally, a builder; and
optionally, a surfactant; and is also provided with
Wherein a 1 wt% solution of the detergent in water provides a pH of at least 10.5 at 25 degrees Celsius and under otherwise standard conditions,
wherein the SiO of the alkali metal silicate 2 :M 2 The weight ratio of O is 1.5 to 4.
2. A liquid professional machine dishwashing detergent according to claim 1 wherein the amount of surfactant is up to 5 wt%, preferably 3 wt%, more preferably 1.5 wt%, even more preferably 1.0 wt%, yet even more preferably up to 0.5 wt%, and advantageously the detergent is substantially free of surfactant.
3. A liquid professional machine dishwashing detergent according to claim 1 or 2 comprising from 2 wt% to 30 wt%, preferably from 4 wt% to 15 wt%, more preferably from 5 wt% to 12 wt% builder, wherein the builder is not an alkali metal silicate.
4. A liquid professional machine dishwashing detergent according to any preceding claim wherein said builder is selected from a) amino polycarboxylates, b) citric acid and/or alkali metal salts thereof or c) carbonates or mixtures thereof, preferably wherein said builder comprises a builder from a) and b), a) and c) or b) and c); and even more preferably wherein said builder from a) comprises GLDA, MGDA or mixtures thereof.
5. A liquid professional machine dishwashing detergent according to any preceding claim wherein the amount of water is from 40 wt% to 90 wt%, preferably from 50 wt% to 85 wt%, more preferably from 55 wt% to 80 wt%, and even more preferably from 60 wt% to 75 wt%.
6. A liquid professional machine dishwashing detergent according to any preceding claim wherein the amount of alkali metal hydroxide in the detergent composition of the present invention is from 12 wt% to 30 wt%, more preferably from 13 wt% to 25 wt%, and even more preferably from 15 wt% to 20 wt%.
7. A liquid professional machine dishwashing detergent according to any preceding claim wherein a 1 wt% solution of the detergent in water provides a pH of from 11.0 to 14.5, preferably from 11.5 to 14.0, more preferably from 12.0 to 13.8, and even more preferably from 12.2 to 13.5, at 25 degrees celsius and under otherwise standard conditions.
8. A liquid professional machine dishwashing detergent according to any preceding claim wherein the liquid detergent is packaged in a container having 1 to 50 litres, preferably 2 to 30 litres, more preferably 4 to 20 litres and even more preferably 8 to 15 litres of the liquid detergent.
9. A professional method for machine dishwashing comprising the steps of:
adding 1 to 10ml of the liquid detergent according to any of the preceding claims per liter of total water used in the main wash of a professional dishwasher;
in the main wash cleaning step, cleaning the dishes at a water temperature of at least 60 ℃; and
a rinsing step of the cutlery at a temperature of at least 60 degrees celsius.
10. A professional method for machine dishwashing according to claim 9, wherein the dishwasher is adapted to clean at least 200 dishes per hour, preferably at least 500 dishes per hour.
11. A professional method for machine dishwashing according to claim 9 or claim 10, wherein the method comprises automatically circulating rinse water for use as water for a subsequent main wash.
12. A professional method for machine dishwashing according to any one of claims 9 to 11, wherein the method does not comprise an active drying step.
13. A professional method for machine dishwashing according to any one of claims 9 to 12, wherein the liquid detergent is self-feeding.
14. Use of alkali metal silicate to reduce sudsing in liquid detergents suitable for professional machine dishwashing.
15. Use of alkali metal silicate to reduce foaming in professional machine dishwashing processes.
CN202280012280.0A 2021-01-29 2022-01-14 Washing liquid for washing tableware of professional machine Pending CN116745398A (en)

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Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4751015A (en) 1987-03-17 1988-06-14 Lever Brothers Company Quaternary ammonium or phosphonium substituted peroxy carbonic acid precursors and their use in detergent bleach compositions
CA2001927C (en) 1988-11-03 1999-12-21 Graham Thomas Brown Aluminosilicates and detergent compositions
DE69125310T2 (en) 1990-05-21 1997-07-03 Unilever Nv Bleach activation
US5378242A (en) * 1992-12-22 1995-01-03 Apollo Chemical Company Liquid alkali for soaping off reactive dyes
HU218008B (en) 1993-05-08 2000-05-28 Henkel Kg. Auf Aktien Silver-corrosion protection agents (i) and mashine cleaning agents containing thereof
DE59405259D1 (en) 1993-05-08 1998-03-19 Henkel Kgaa SILVER CORROSION PROTECTANT I
CA2171312A1 (en) 1993-10-14 1995-04-20 Petrus Adrianus J. M. Angevaare Detergent compositions containing silver anti-tarnishing agents
US5547612A (en) 1995-02-17 1996-08-20 National Starch And Chemical Investment Holding Corporation Compositions of water soluble polymers containing allyloxybenzenesulfonic acid monomer and methallyl sulfonic acid monomer and methods for use in aqueous systems
US6210600B1 (en) 1996-12-23 2001-04-03 Lever Brothers Company, Division Of Conopco, Inc. Rinse aid compositions containing scale inhibiting polymers
AU2009322574B2 (en) * 2008-12-02 2014-05-15 Diversey, Inc. Ware washing system containing cationic starch
CN108559651B (en) * 2018-05-14 2020-12-01 中国日用化学研究院有限公司 High-temperature-resistant and low-foam protein dirt alkaline cleaning agent and preparation method thereof

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