JP2009173704A - Detergent composition for dishwasher - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a detergent composition, which has excellent storage stability even in varied storage conditions and exhibits excellent washability in washing dishes by an automatic dishwasher, for a dishwasher. <P>SOLUTION: The detergent composition for a dishwasher comprises the following components by amounts within predetermined ranges respectively: (A) one or more kinds of inorganic compounds selected among the group consisting of silicate, carbonate and sulfate; (B) a chlorine bleach; (C) a compound selected among citric acid and its salt; and (D) a nonionic surfactant. The total amount of the silicate and the carbonate in the component (A) is 60wt% or more, and the content of the component (C) in all the chelating agents is 80wt% or more. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a detergent composition for use in a dishwasher. In particular, the present invention relates to a detergent composition for use in a commercial dishwasher.

  A dishwasher is a facility for washing dishes such as dirty dishes, glasses and cooking utensils, and is used in kitchens such as homes, restaurants and coffee shops. In general, dishwashing is performed in the order of washing process-rinsing process. In the washing process, a non-foaming or low-foaming dishwasher cleaner different from a dishwashing detergent for hand washing is used. Further, a detergent for dishwashers may contain a bleaching agent in order to obtain bleaching performance against discolored stains such as tea astringency and coffee.

Patent Document 1 describes an alkali metal hydroxide, an alkali metal tripolyphosphate, an alkali metal hypochlorite, a water-soluble chelating agent and water in specific ratios for detergency, bleaching action, finish, and storage stability. An excellent liquid detergent composition for automatic washing machines is described. Patent Document 2 describes a hard sterilization detergent for hard bodies that contains a chlorine-based disinfectant, a solid acid, and a surfactant in a specific ratio, has a specific pH, and has a high detergency and high sterilization ability. ing. Furthermore, Patent Document 3 discloses a detergent composition for an automatic dishwashing machine, which is excellent in washing effect and bleaching effect, containing an alkaline agent, a polyacrylic acid or maleic acid polymer material having a specific molecular weight and a bleaching agent in a specific ratio. Is described.
JP 2006-335908 A JP-A-11-148098 JP-A-8-199194

  As described above, in the cleaning using the automatic dishwasher detergent, the immersion cleaning is generally performed periodically using the bleaching agent, and it takes time and labor. Various studies have been made on detergents containing bleaching agents. For example, in a phosphorus-free blending system, a problem arises when the use conditions are taken into consideration regarding the stability of the bleaching components.

  That is, in the actual use situation of the detergent, the dishwasher detergent is, for example, in a powder state (packed state), in a wet state (in contact with water in a hopper), in a solution state (for washing). It is difficult to maintain excellent storage stability in accordance with these techniques. As a result, sufficient effects were not obtained in terms of detergency and bleaching power.

  Therefore, the problem of the present invention is that the storage stability is excellent even when stored in various forms, and excellent cleaning properties (detergency and detergency in cleaning dishes such as ceramics, glass, and plastic using an automatic dishwasher). It is an object of the present invention to provide a detergent composition for a dishwasher that exhibits (bleaching power).

  The present invention comprises (A) one or more inorganic compounds selected from the group consisting of silicate, carbonate and sulfate (hereinafter referred to as component (A)) 50 to 90% by weight, (B) chlorine bleach [ Hereinafter referred to as (B) component] 0.1 to 10% by weight, (C) a compound selected from citric acid and its salt [hereinafter referred to as (C) component] 5 to 50% by weight, and (D) nonionic interface Activating agent (hereinafter referred to as component (D)) is contained in an amount of 0.1 to 10% by weight, the total amount of silicate and carbonate in (A) is 60% by weight or more, and the content of (C) is all The present invention relates to a detergent composition for a dishwasher which is 80% by weight or more in a chelating agent.

  According to the present invention, even when stored in various forms, the storage stability is excellent, and in cleaning dishes such as ceramics, glass and plastic using an automatic dishwashing machine, excellent cleaning properties (detergency and bleaching power) A dishwasher cleaning composition is provided.

<(A) component>
(A) As a component, the alkali metal salt of silicic acid, the alkali metal salt of carbonic acid, and the alkali metal salt of a sulfuric acid are preferable. Moreover, the compound of (B) component has a preferable anhydride. Specifically, alkali metal carbonates such as sodium carbonate, potassium carbonate and sodium bicarbonate, alkali metal sulfates such as sodium sulfate, alkali metal silicates such as sodium silicate, potassium silicate and sodium metasilicate, and anhydrous Things. (A) As an ingredient, anhydrous sodium carbonate, anhydrous potassium carbonate, and anhydrous sodium silicate are preferred. Moreover, it is preferable to contain both carbonate and silicate.

<(B) component>
As component (B), chloroisocyanuric acid, sodium dichloroisocyanurate, potassium dichloroisocyanurate, tridichloroisocyanuric acid, salicy powder, high-grade salicy powder, sodium chlorite and the like in hypochloric acid or The thing which can generate | occur | produce chlorous acid can be mentioned. These can be used alone or in combination of two or more. As the component (B), sodium dichloroisocyanurate is preferable.

<(C) component>
Among the components (C), examples of the salt of citric acid include alkali metal salts such as sodium salt. (C) As a component, sodium citrate is preferable.

<(D) component>
(D) Component is not particularly limited, but glycerin fatty acid ester, polyglycerin fatty acid ester, propylene glycol fatty acid ester, polyethylene glycol fatty acid ester, sorbitan fatty acid ester, sucrose fatty acid ester, polyoxyethylene sorbitan fatty acid ester, polyoxyethylene Examples include alkyl ether, polyoxyethylene dialkyl ether, polyoxyethylene glycol, polyoxyethylene oxypropylene glycol, polyoxypropylene oxyethylene oxypropylene glycol and the like.

From the viewpoint of detergency, a nonionic surfactant represented by the following general formula (D1) [hereinafter referred to as component (D1)] is preferably used.
R ^1- (AO) _n -R ² (D1)
[Wherein, R ^1, R ² are each independently a hydrogen atom or a hydrocarbon group having 1 to 24 carbon atoms. n is an average addition mole number, and is a number of 1-500. AO is the same or different and is an oxyethylene group, an oxypropylene group, or an oxybutylene group. ]

In the general formula (D1) of the component (D1), R ¹ and R ² are each independently preferably a hydrogen atom or a linear or branched alkyl group having 1 to 24 carbon atoms, more preferably a hydrogen atom, Or a linear or branched alkyl group having 6 to 18 carbon atoms, particularly preferably a hydrogen atom, or a linear or branched alkyl group having 8 to 14 carbon atoms. Moreover, in general formula (D1), n is an average addition mole number, Preferably it is 1-400, More preferably, it is 1-350, More preferably, it is 1-200, Most preferably, it is a number of 1-100. Moreover, in general formula (D1), AO is the same or different, Preferably they are an ethylene group and a propylene group.

Furthermore, from the viewpoint of detergency, non-foaming property and low-foaming property, from the nonionic surfactant represented by the following general formula (D2-1) and the nonionic surfactant represented by the general formula (D2-2) One or more selected nonionic surfactants (hereinafter referred to as component (D2)) are preferred.
HO (CH ₂ CH ₂ O) _a (CH (CH ₃ ) CH ₂ O) _b (CH ₂ CH ₂ O) _c H (D2-1)
HO (CH (CH ₃ ) CH ₂ O) _d (CH ₂ CH ₂ O) _e (CH (CH ₃ ) CH ₂ O) _f H (D2-2)
[Wherein, a, b, c, d, e and f are the average number of moles added, each independently a number of 1 to 350. ]

  In the general formulas (D2-1) and (D2-2), a, b, c, d, e, and f are averages of ethylene oxide (hereinafter referred to as EO) or propylene oxide (hereinafter referred to as PO). It is the number of added moles, each independently a number of 1 to 350.

  The component (D2) preferably contains 10 mol% or more of EO in the total of EO and PO, and a, b, c, d, e and f are preferably selected so as to satisfy this.

  Moreover, 1,000-15,000 are preferable and, as for the weight average molecular weight of (D2) component, More preferably, it is 1,500-6,000. The component (D2) is available from BASF under the trade names “Pluronic” and “Pluronic R”. As the component (D2), a nonionic surfactant represented by the formula (D2-2) is preferable from the viewpoint of low foamability.

From the viewpoint of finish, one or more nonionic surfactants selected from the nonionic surfactant represented by the following general formula (D3-1) and the nonionic surfactant represented by the general formula (D3-2) A surfactant [hereinafter referred to as component (D3)] is preferred.
_{^{R 3 -O- (EO) p -}} (PO) q - (EO) r -H (D3-1)
[Wherein R ³ represents a linear alkyl group having 8 to 18 carbon atoms or a linear alkenyl group, EO represents an oxyethylene group, and PO represents an oxypropylene group. p, q, and r represent average addition mole numbers, respectively, p = 1-10, q = 0.5-5, r = 1-10. ]
_{^{R 4 -O- (EO) s -}} (PO) t -H (D3-2)
[Wherein, R ⁴ represents a branched alkyl group having 8 to 18 carbon atoms or a branched alkenyl group, EO represents an oxyethylene group, and PO represents an oxypropylene group. s and t each represent an average added mole number, s = 4 to 10, t = 2 to 10, and 0.3 ≦ (t / s) ≦ 1.5. ]

In the general formula (D3-1), R ³ is preferably a linear alkyl group having 10 to 14 carbon atoms or a linear alkenyl group, and more preferably a linear alkyl group having 10 to 14 carbon atoms, and p = 2 to 8 Q = 0.5 to 4.5, more preferably 1 to 4.5, particularly preferably 1 to 2, r = 2 to 8 is preferable, p + r = 1 to 30, further 2 to 20, and particularly 4 to 15 Is preferred. Specific examples of the nonionic surfactant of the general formula (D3-1) include polyoxyethylene (3) polyoxypropylene (1.5) polyoxyethylene (3) lauryl ether, polyoxyethylene (5) polyoxypropylene (1.5) Polyoxyethylene (5) lauryl ether, polyoxyethylene (5) polyoxypropylene (4.5) polyoxyethylene (5) lauryl ether and the like. Here, regarding the said compound, the inside of () is the average addition mole number of ethylene oxide or propylene oxide (hereinafter the same).

In General Formula (D3-2), R ⁴ is preferably a branched alkyl group having 10 to 14 carbon atoms or a branched alkenyl group, and more preferably a branched alkyl group having 10 to 14 carbon atoms. Among the branched alkyl groups having 10 to 14 carbon atoms or branched alkenyl groups of R ^4, a secondary alkyl group or secondary alkenyl group having 10 to 14 carbon atoms is preferable. In general formula (D3-2), s = 5-9 is preferable and t = 5-10 is preferable. Specific examples of the nonionic surfactant represented by the general formula (D3-2) include polyoxyethylene (7) polyoxypropylene (8.5) -sec-dodecyl ether, polyoxyethylene (7) polyoxypropylene (8. 5) -sec-tridecyl ether, polyoxyethylene (7) polyoxypropylene (8.5) -sec-tetradecyl ether, and the like.

In addition, the compound of the general formula (D3-2) can be obtained by adding EO to a branched (preferably secondary) alcohol having a branched (preferably secondary) alkyl group or branched (preferably secondary) alkenyl group of R ^4. It can be synthesized by adding PO after adding PO.

  Further, the weight average molecular weight of the component (D3) is preferably 200 to 5,000, more preferably 200 to 2,000. Among the components (D3), the compound of the general formula (D3-1) is available from Kao Corporation under the trade name “Emulgen”, and the compound of the general formula (D3-2) is a product of “Softanol”. It is available from Nippon Shokubai Co., Ltd. by name. The component (D3) is preferably a nonionic surfactant of the general formula (D3-1) from the viewpoint of finish.

  The cleaning composition for a dishwasher of the present invention can contain a compound called a builder, particularly an organic compound. As the action mechanism of the builder, a metal chelate action, an alkali buffer action, and a solid particle dispersion action are important. Especially, it is preferable to contain a chelating agent.

  As chelating agents, phosphates such as sodium pyrophosphate, potassium pyrophosphate, sodium tripolyphosphate, sodium orthophosphate, sodium hexametaphosphate other than the component (A) are known as inorganic chelating agents.

  On the other hand, as a chelating agent, as an organic chelating agent, (i) ethane-1,1-diphosphonic acid, ethane-1,2-diphosphonic acid, ethane-1-hydroxy-1,1-diphosphonic acid and derivatives thereof Salts of phosphonic acids such as ethanehydroxy-1,1,2-triphosphonic acid, ethane-1,2-dicarboxy-1,2-diphosphonic acid, methanehydroxyphosphonic acid, (b) 2-phosphonobutane-1,2 A salt of a phosphonocarboxylic acid such as a dicarboxylic acid, 1-phosphonobutane-2,3,4-tricarboxylic acid, α-methylphosphonosuccinic acid, (ha) a salt of an amino acid such as aspartic acid, glutamic acid, (d) nitrilo Aminopolyacetates such as triacetate and ethylenediaminetetraacetate, (e) diglycolic acid, oxydisuccinic acid, carboxymethyloxyco Succinic acid, cyclopentane-1,2,3,4-tetracarboxylic acid, tetrahydrofuran-1,2,3,4-tetracarboxylic acid, tetrahydrofuran-2,2,5,5-tetracarboxylic acid, lactic acid, tartaric acid, Examples thereof include salts of organic acids other than citric acid, such as oxalic acid, sulfosuccinic acid, malic acid, and gluconic acid, (f) polyacrylic acid salt, polyacrylic acid / polymaleic acid copolymer polymer compound, and salts thereof.

  In the present invention, a chelating agent containing phosphorus is preferably not contained. Therefore, the composition of the present invention is preferably a so-called phosphorus-free cleaning composition.

  Moreover, the organic polymer compound of the powder which has the water absorption by a hydrogen bond can be contained. Specifically, dextrin, carrageenan, xanthan gum, guar gum, pectin, locust bin gum, or derivatives thereof, polysaccharides such as modified starch, methylcellulose, carboxymethylcellulose, synthetic polymer compounds such as polyvinyl alcohol, polyacrylamide, polyethylene oxide, etc. Is mentioned. These contents are preferably from 0.1 to 20% by weight, more preferably from 0.5 to 15% by weight, especially from the viewpoint of storage stability, with respect to the detergent composition for a dishwasher of the present invention. Preferably it is 1 to 10% by weight.

  In addition, an anionic surfactant, an amphoteric surfactant, an enzyme, a bleaching agent, an antifoaming agent, a rust preventive agent, a hydrotrope agent, a surface modifier, a fragrance and the like can be contained.

  As the above components, those described in International Publication No. 99/58633 pamphlet can be referred to.

<Cleaning composition for dishwasher>
In the detergent composition for a dishwasher of the present invention, the component (A) is preferably 50 to 90% by weight, more preferably 50 to 80% by weight, from the viewpoint of detergency. More preferably, it contains 60 to 70% by weight.

  Moreover, from the viewpoint of detergency, the detergent composition for a dishwasher of the present invention has a total of 60 wt% or more, preferably 65 to 100 wt%, of the silicate and carbonate in the component (A). More preferably, it is 70-100 weight%, More preferably, it is 80-100 weight%.

  In the dishwasher cleaning composition of the present invention, the component (B) is preferably 0.1 to 10% by weight, more preferably 1 to 10% by weight, from the viewpoint of bleaching performance. More preferably, it contains 1 to 5% by weight, still more preferably 2 to 5% by weight.

  In the detergent composition for a dishwasher of the present invention, the component (C) is preferably 5 to 50% by weight, more preferably 10 to 50% by weight, from the viewpoint of calcium capturing ability. More preferably, it contains 20-50 weight%, More preferably, it contains 30-40 weight%.

  The detergent composition for a dishwasher of the present invention comprises 10 to 99.9% by weight of the chelating agent in total including the component (C), from the viewpoints of detergency, sequestering properties and anti-recontamination properties, It is preferable to contain 20 to 99% by weight, and further 30 to 95% by weight. In the present invention, from the viewpoint of the stability of the component (B), the proportion of the component (C) in the total chelating agent in the composition is 80% by weight or more, preferably 90% by weight or more, more preferably 100% by weight. %.

  In addition, the content of aminopolyacetate in the chelating agent is preferably 5% by weight or less, more preferably 3% by weight or less in the composition, and more preferably no aminopolyacetate is contained as a chelating agent.

  Moreover, in the detergent composition for dishwashers of this invention, the weight ratio of (B) component and (C) component is (B) / (C) = 0.02-2 from a viewpoint of effective chlorine stability. Further, it is preferably 0.05 to 1, more preferably 0.1 to 0.5.

  In the detergent composition for a dishwasher of the present invention, the component (D) is preferably 0.01 to 50% by weight, more preferably 0.05 to 30% by weight from the viewpoint of detergency. More preferably, it contains 0.1 to 20% by weight, and still more preferably 0.5 to 10% by weight.

  In addition, the detergent composition for a dishwasher of the present invention is preferably used as a cleaning solution diluted to an appropriate concentration with water or the like when used, for example, diluted to 0.05 to 0.5% by weight. It is done.

  In the case of washing with a commercial dishwasher using the detergent composition for a dishwasher of the present invention, the composition is arbitrarily transferred into a commercial dishwasher by a supply device, and the proper composition is transferred. The concentration of the cleaning solution is maintained. The form of the detergent composition for a dishwasher of the present invention is preferably a solid or powder from the viewpoint of storage stability. As a usage method, it is used for a dishwasher in which a plastic hopper filled with a detergent composition for a dishwasher is set in a predetermined direction in a dedicated hopper for a commercial dishwasher, or in a pouch container or the like. Transfer the cleaning composition to a hopper dedicated to commercial dishwashers, spray water or hot water onto the cleaning composition for dishwashers with a spray or shower, etc., and dissolve the cleaning solution into the commercial dishwasher Supplied.

  In a commercial dishwasher, when washing dishes continuously, the cleaning liquid is circulated with a pump and repeatedly used for washing. Since the cleaning liquid prepared from the composition of the present invention is excellent in storage stability and has little decrease in effective chlorine concentration, an excellent cleaning effect can be obtained even in such a use mode.

  In the case of continuously washing dishes with a commercial dishwasher, the concentration of the washing liquid decreases with the number of washings due to carry-out of the washing liquid by tableware or carry-over of rinsing water to the washing tank. In order to maintain an appropriate concentration of the cleaning liquid, the dishwasher cleaning composition is supplied to an appropriate concentration by an automatic supply device.

  The automatic supply device for the dishwasher cleaning composition is not particularly limited, but the concentration of the cleaning liquid is sensed and a signal is received to obtain a powder or solid dishwasher cleaning composition. Water or warm water is sprayed in the form of a spray or shower to supply a necessary amount of the detergent composition for a dishwasher.

  This automatic supply device is preferably used for business use with a very large number of cleanings per day, and has the advantage that it saves a lot of time compared to manual feeding for each cleaning frequency. It becomes easy to maintain a proper concentration in the middle (during washing).

  A detergent composition for a dishwasher having the composition shown in Table 1 was prepared, and the detergency and storage stability were evaluated by the following methods. The results are shown in Table 1.

[1] Evaluation of detergency Using a 1-door type commercial dishwasher (Sanyo Electric DW-230L type) as a washing machine, 5 g of composite model dirt (a mixture of protein, fat and starch) was applied and dried. Four magnetic dishes (diameter 200 mm × height 30 mm) were washed under the conditions of a washing temperature of 60 ° C., a detergent composition concentration of 0.2% by weight, a washing time of 40 seconds, a rinsing temperature of 80 ° C., and a rinsing time of 15 seconds. After drying, the appearance of the magnetic dish was visually observed, and the washability was determined according to the following criteria.
Judgment criteria ◎: Dirt was completely removed from all four magnetic dishes. ○: Dirt was removed from all four magnetic dishes. △: Dirt was not sufficiently removed from all four magnetic dishes. All four dishes are almost free of dirt.

[2] Storage stability evaluation (2-1) Evaluation 1
Effective chlorine concentration after storage of the detergent composition in a bag-like container (material nylon / PET laminate film) and shape (flat bag, capacity of about 3 L) and sealed for 20 days at 50 ° C. Was measured, and the effective chlorine residual rate after storage was determined from the effective chlorine concentration before storage. The storage stability was evaluated from the effective chlorine residual rate according to the following criteria. This evaluation is an evaluation of storage stability assuming storage in the form of a pouched product. The result of this evaluation is shown as “powder storage” in the table.
Judgment criteria ◎: Effective chlorine residual ratio is 90% or more ○: Effective chlorine residual ratio is 60% or more and less than 90% △: Effective chlorine residual ratio is 40% or more and less than 60% ×: Effective chlorine residual ratio is less than 40%

(2-2) Evaluation 2
A predetermined amount (about 2 kg) of the cleaning composition is put into the hopper of a commercial conveyor type dishwasher DW2000R / L (Sanyo Electric), and the cleaning machine is set so that the concentration of the cleaning liquid is 0.1% by weight. The initial effective chlorine concentration (effective chlorine concentration before storage) is measured. Further, the operation is stopped with the cleaning agent in the hopper sufficiently wet. The cleaning agent was left in a wet state in the hopper and the apparatus was operated in the same manner three days later. The effective chlorine concentration at that time was measured to determine the effective chlorine residual rate. Storage stability was evaluated according to the same criteria as in Evaluation 1. This evaluation is an evaluation of storage stability assuming a case in which water is left in contact with the cleaning agent in the hopper in an actual use situation. The result of this evaluation is shown as “wet preservation” in the table.

(2-3) Evaluation 3
A 0.1 wt% aqueous solution of the cleaning composition was prepared, and the effective chlorine concentration after standing at 50 ° C. for 3 hours was measured to determine the effective chlorine residual ratio. Storage stability was evaluated according to the same criteria as in Evaluation 1. This evaluation is an evaluation of the storage stability of the cleaning liquid prepared from the cleaning agent supplied from the hopper. The result of this evaluation is shown as “solution storage” in the table.

(Note) The components in the table are as follows.
Nonionic surfactant: PO / EO / PO block polymer, Pluronic RPE2520 (manufactured by BASF)
NTA3Na: nitrilotriacetic acid trisodium salt (disorbin A-92 manufactured by Akzo Nobel)
EDTA4Na 2H ₂ O: ethylenediaminetetraacetic acid tetrasodium salt dihydrate Polymer dispersing agent: acrylic acid / maleic acid copolymer, sodium salt: Sokalan CP5 Granules (BASF)

Claims (5)

  (A) 50 to 90% by weight of one or more inorganic compounds selected from the group consisting of silicate, carbonate and sulfate, (B) 0.1 to 10% by weight of chlorine bleach, (C) citric acid and 5 to 50% by weight of a compound selected from the salt, and (D) 0.1 to 10% by weight of a nonionic surfactant, and the total of silicate and carbonate in (A) is 60% by weight or more. A cleaning composition for a dishwasher, wherein the content of (C) is 80% by weight or more in the total chelating agent.   (A) The cleaning composition for dishwashers according to claim 1, wherein the inorganic compound is an anhydride.   (B) The cleaning composition for dishwashers according to claim 1 or 2, wherein the chlorine bleach is a compound selected from dichloroisocyanuric acid and salts thereof.   The weight ratio of (B) and (C) is (B) / (C) = 0.2-2, The cleaning composition for dishwashers in any one of Claims 1-3.   The cleaning composition for dishwashers according to any one of claims 1 to 4, which does not contain a chelating agent containing phosphorus as a chelating agent.