JP2010047731A - Liquid detergent composition for dish washer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a liquid detergent composition for dish washers, having excellent detergency to protein stains and the like and excellent in foam suppressing property. <P>SOLUTION: The liquid detergent composition for dish washers comprises ≥0.1 wt.% but <1 wt.% specific PO-EO-PO type nonionic surfactant (A) represented by general formula (I) shown bellow, a builder (B) and alkenyl succinic acid metal salt (C), wherein the weight ratio of (A) and (C) is (C)/(A)=2/3 to 10/1. HO(CH(CH<SB>3</SB>)CH<SB>2</SB>O)<SB>a</SB>(CH<SB>2</SB>CH<SB>2</SB>O)<SB>b</SB>(CH(CH<SB>3</SB>)CH<SB>2</SB>O)<SB>c</SB>H (I). (Wherein, a, b and c are respectively an average addition number of moles and each independently a number of 1-350). <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a liquid detergent composition for a 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. In addition, a rinsing agent is used in the rinsing process for commercial dishwashers used in kitchens such as restaurants and coffee shops.

These dishwasher cleaning compositions contain an alkaline agent such as sodium hydroxide, potassium hydroxide, sodium carbonate or potassium carbonate for the purpose of removing strong oily dirt. A detergent composition for dishwashers containing 5% or more of sodium hydroxide or potassium hydroxide becomes a “non-medical deleterious substance” and requires special knowledge and handling. Moreover, the detergent composition for tableware washing machines containing the said alkaline agent may erode glass tableware or blacken aluminum tableware. In addition, if splashed and adhered to the skin, it may cause strong irritation, and if it enters the eyes, it may cause blindness, so workers must wear appropriate gloves and protective glasses for safety. Must be worn. Then, the neutral type dishwasher detergent composition which mix | blended various surfactants which have high washing | cleaning property with respect to oil stains instead of the said alkali agent is proposed. However, there are many bubbles that are not suitable for nozzle-jet type machine cleaning via a pump.

In addition, it can reduce the load on the environment by reducing the blending ratio of alkali metal hydroxide salt, which is a strong alkali agent, and is a liquid detergent with excellent cleaning performance, low foamability, storage stability, and finish after rinsing. In order to provide the composition, Patent Document 1 proposes to use an alkaline agent, a sequestering agent, a solubilizer composed of an alkenyldicarboxylic acid dialkali metal salt, and a nonionic surfactant under specific conditions.
JP 2001-316700 A

  However, in Patent Document 1, it is necessary to add a certain amount of a nonionic surfactant to ensure the cleaning performance, and the low-foaming property required for the dishwasher cleaning agent is maintained while maintaining the cleaning power. It is difficult to get enough.

  An object of the present invention is to provide a liquid detergent composition for a dishwasher that has excellent detergency against protein stains and the like and is also excellent in foam suppression.

The present invention relates to a nonionic surfactant (A) represented by the following general formula (I) (hereinafter referred to as component (A)) of 0.1% by weight or more and less than 1% by weight, builder (B) [hereinafter, ( B) component] and alkenyl succinic acid metal salt (C) [hereinafter referred to as component (C)], and the weight ratio of (A) to (C) is (C) / (A) = 2/3 It is related with the liquid detergent composition for dishwashers which is 10/1.
HO (CH (CH ₃ ) CH ₂ O) _a (CH ₂ CH ₂ O) _b (CH (CH ₃ ) CH ₂ O) _c H (I)
[In formula, a, b, and c are average addition mole number, and are the numbers of 1-350 each independently. ]

  ADVANTAGE OF THE INVENTION According to this invention, the liquid detergent composition for tableware washing machines which has the outstanding detergency with respect to protein dirt etc. and was excellent also in foam suppression property is obtained. In the liquid detergent composition for a dishwasher according to the present invention, such an effect can be obtained with a small amount of nonionic surfactant, which is advantageous in terms of uniform blending in a system including a builder. Stability is also good.

<(A) component>
In the formula (I) of the component (A), a, b and c are the average added moles of ethylene oxide (hereinafter referred to as EO) or propylene oxide (hereinafter referred to as PO), and are each independently , 1 to 350.

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

  Moreover, 1,000-15,000 are preferable and, as for the weight average molecular weight of (A) component, More preferably, it is 1,500-6,000. The component (A) is available from BASF under the trade name “Pluronic RPE”.

<(B) component>
As the action mechanism of the component (B) builder, a metal chelate action, an alkali buffer action, and a solid particle dispersing action are important.

  Examples of inorganic builders include phosphates, carbonates, silicates, and sulfates. Specifically, sodium pyrophosphate, potassium pyrophosphate, sodium tripolyphosphate, potassium tripolyphosphate, sodium orthophosphate, sodium hexametaphosphate, sodium carbonate, potassium carbonate, sodium bicarbonate, sodium sulfate, sodium silicate, potassium silicate, metasilicate Sodium etc. are mentioned. Moreover, alkali metal hydroxides such as sodium hydroxide and potassium hydroxide are also included.

  Examples of the organic builder include (a) ethane-1,1-diphosphonic acid, ethane-1,2-diphosphonic acid, ethane-1-hydroxy-1,1-diphosphonic acid and its derivatives, ethanehydroxy-1,1,2 -Phosphonic acid salts such as triphosphonic acid, ethane-1,2-dicarboxy-1,2-diphosphonic acid, methanehydroxyphosphonic acid, (b) 2-phosphonobutane-1,2-dicarboxylic acid, 1-phosphonobutane-2 , 3,4-tricarboxylic acid, salt of phosphonocarboxylic acid such as α-methylphosphonosuccinic acid, (c) salt of amino acid such as aspartic acid, glutamic acid, (d), nitrilotriacetic acid salt, ethylenediaminetetraacetic acid salt Aminopolyacetates such as (e) diglycolic acid, oxydisuccinic acid, carboxymethyloxysuccinic acid, cyclopentane-1, , 3,4-tetracarboxylic acid, tetrahydrofuran-1,2,3,4-tetracarboxylic acid, tetrahydrofuran-2,2,5,5-tetracarboxylic acid, citric acid, lactic acid, tartaric acid, oxalic acid, sulfosuccinic acid, Examples thereof include salts of organic acids such as malic acid and gluconic acid, (f) polyacrylic acid salt, polyacrylic acid / polymaleic acid copolymer polymer compound and salts thereof.

<(C) component>
The alkenyl succinic acid metal salt of component (C) preferably has an alkenyl group having 8 to 22 carbon atoms and further 10 to 16 carbon atoms. In addition, examples of the metal salt include potassium salt and sodium salt, and potassium salt is preferable from the viewpoint of solubility in the composition and solution stability. The salt may be a mono salt or a di salt, and a di salt is preferred. (C) As a component, the alkenyl succinic-acid dipotassium salt which has a C12-C14 alkenyl group is preferable.

<Liquid detergent composition for dishwashers>
In the liquid detergent composition for a dishwasher of the present invention, the content of the component (A) is from 0.1% by weight to less than 1% by weight, preferably from 0.2 to 0, from the viewpoint of foam suppression. 9.9% by weight, more preferably 0.3 to 0.9% by weight, still more preferably 0.5 to 0.8% by weight.

  Moreover, the liquid detergent composition for tableware washing machines of this invention, (B) component from a viewpoint of a washability and solution stability, Preferably it is 1 to 80 weight%, More preferably, it is 5 to 60 weight%, Furthermore, Preferably it contains 10 to 50 weight%, More preferably, it contains 10 to 40 weight%.

  Moreover, the liquid detergent composition for tableware washing machines of this invention becomes like this. Preferably (C) component is 0.1 to 10 weight% from a viewpoint of detergency and foam suppression property, More preferably, it is 0.5-8. % By weight, more preferably 1 to 5% by weight, still more preferably 1 to 3% by weight.

  In the liquid detergent composition for a dishwasher according to the present invention, the weight ratio of the component (A) to the component (C) is (C) / (A) = 2/3 to 10/1, preferably 1. / 1 to 8/1, more preferably 2/1 to 6/1. In the present invention, the combined use of the (A) component and the (C) component at such a weight ratio improves the cleaning power (in particular, the cleaning power against protein stains). Good cleanability can be secured even with a small amount. As a result, the antifoaming property required for the liquid detergent composition for dishwashers can be realized, and the small amount of the component (A) is required for the system containing the component (B) which is a builder. This is also advantageous in terms of uniformity.

  The balance of the liquid detergent composition for a dishwasher of the present invention is usually water. Moreover, it is preferable that the liquid detergent composition for tableware washing machines of this invention is 10-13 at 25 degreeC, and also 11-11 is pH of the undiluted | stock solution or 1 weight% concentration aqueous solution.

  In addition, anionic surfactants other than the component (C), nonionic surfactants other than the component (A), amphoteric surfactants, enzymes, bleaching agents, antifoaming agents, rust preventives, hydrotropes, surface modification A quality agent, a fragrance | flavor, etc. can be contained.

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

  The liquid detergent composition for a dishwasher of the present invention is preferably used as a cleaning liquid diluted to an appropriate concentration with water or the like.

  In the case of washing with a commercial dishwasher using the liquid detergent composition for a dishwasher of the present invention, the composition is arbitrarily transferred into a commercial dishwasher by a supply device, and is appropriately transferred. The concentration of the correct cleaning solution is maintained. The dishwasher liquid detergent composition is used for commercial dishwashing by inserting a tube dedicated to commercial dishwashers directly into a plastic container filled with the liquid detergent composition for dishwashers. Supplied inside the machine.

  The liquid detergent composition for a dishwasher of the present invention is used at a concentration of 0.05 to 0.5% by weight in the cleaning liquid, but from the viewpoint of economy and detergency, 0.05 to 0.3. % By weight is preferable, and 0.05 to 0.2% by weight is more preferable. The washing time for tableware is preferably 10 seconds to 3 minutes, more preferably 20 seconds to 2 minutes, from the viewpoint of detergency. The cleaning temperature of the cleaning liquid is very important for improving the cleaning performance in a short time, and is preferably 40 ° C. or more, and particularly preferably 40 to 70 ° C. After the dishes are washed, they are usually rinsed quickly with hot water at 60 to 90 ° C. in the same commercial dishwasher. Rinsing can be performed only with hot water at 60 to 90 ° C.

  In a commercial dishwasher, when washing dishes continuously, the cleaning liquid is circulated with a pump and repeatedly used for washing.

  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 liquid detergent composition for the dishwasher is supplied by the automatic supply device so as to obtain an appropriate concentration.

  The automatic supply device for the liquid detergent composition for a dishwasher is not particularly limited, but the concentration of the washing liquid is sensed, a signal is received, the tube pump is driven, and the required amount of dishwashing is performed. Supply the machine liquid detergent composition.

  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).

  Liquid detergent compositions for dishwashers (both at pH 11.8 / 25 ° C.) having the composition shown in Table 1 were prepared, and the detergency and foam suppression were evaluated by the following methods. The results are shown in Table 1.

[Detergency evaluation]
[1] Detergency evaluation / model dirt production (modified egg yolk dirt)
In the center of a new porcelain dish with a diameter of 20 cm, 2 g of egg yolk was uniformly applied with a brush in a circular shape with a diameter of about 10 cm and placed in an electric dryer set at 80 ° C. After 30 minutes, the porcelain dish coated with egg yolk was taken out, and naturally cooled was used as a model stain of denatured egg yolk stain (protein stain) for evaluation of detergency.
(Oil stains)
In the center of a new 20 cm diameter polypropylene (PP) dish, 5 g of commercially available salad oil colored with 0.1% by weight of Sudan IV is uniformly applied to a circle with a diameter of about 10 cm. Used for detergency evaluation.

Evaluation method 57 g of the liquid detergent composition for a dishwasher was placed in a washing tank (38 L) of a commercial dishwasher [SANYO DR53 manufactured by Sanyo Electric Co., Ltd.] and dissolved in hot water at 50 ° C. Set 4 plates (2 denatured egg yolk stains, 2 oil stains) coated with model dirt on a dedicated rack, wash with 50 ° C cleaning solution for 1 minute, and then use 80 ° C without rinsing agent Rinse with rinsing water for 8 seconds. A porcelain dish (two denatured egg yolk stains) was taken out from the dedicated rack, colored with a 1% by weight aqueous solution of erythrosine dye, and the detergency was evaluated according to the following criteria. The PP dish (two oil stains) was rinsed completely with 100 g of normal hexane, taken out into a disposable cell, and colorimetrically measured with a spectrophotometric system (520 nm) manufactured by HITACHI. The residual amount (mg) of oil per dish was calculated from the calibration curve, and the detergency was evaluated according to the following criteria.

* Judgment criteria for denatured egg yolk stains ◎: No colored traces were observed, completely removed stains ○: Slightly colored traces were observed, but most stains were removed △; ×: Most of the stains remain, and many stains remain.

* Judgment criteria for oil stain cleaning ability ◎; remaining amount of oil is less than 10 mg ○; remaining amount of oil is 10 mg or more and less than 20 mg Δ; remaining amount of oil is 20 mg or more and less than 30 mg ×;

[2] Foam suppression evaluation / evaluation method 40g of milk, 20g of rapeseed oil, and 57g of liquid detergent composition for dishwashers are placed in the washing tank (38L) of a commercial dishwasher [SANYO DR53 manufactured by Sanyo Electric Co., Ltd.] Then, it was dissolved in warm water at 50 ° C. After washing with a washing solution at 50 ° C. for 1 minute, rinsing with rinsing water at 80 ° C. for 8 seconds without using a rinsing agent, and foaming in the washing machine immediately after the washing is suppressed according to the following criteria. Sex was evaluated.
◎: Foam is hardly observed ○: There is a thin bubble but disappears immediately Δ: Thick foam is formed but it does not overflow from the washing machine.
X: Thick foam is formed and overflows from the washing machine.

  From the results in Table 1, it was revealed that the liquid detergent composition for dishwashers of the present invention is excellent in cleanability and foam suppression.

The components in the table are as follows.
Polyacrylic acid, potassium salt: Oligomer M3 (manufactured by Kao Corporation)
・ Potassium alkenyl succinate: Latemul DSK (manufactured by Kao Corporation)
・ Nonionic surfactant A1: PO / EO / PO block polymer, Pluronic RPE2520 (BASF)
Nonionic surfactant A2: a nonionic surfactant represented by the following general formula (I ′), wherein R ^1b in the formula (I ′) is a linear alkyl group having 12 carbon atoms, p = 3 , Q = 1.5, r = 3 nonionic surfactant R ^1b —O— (EO) _p — (PO) _q — (EO) _r —H (I ′)
Nonionic surfactant A3: a nonionic surfactant represented by the following general formula (I ″), wherein R ^2b in the formula (I ″) is a branched lauryl group, s = 7, t = 8.5 Nonionic Surfactant (Ethylene oxide average addition mole number 7, propylene oxide average addition mole number 8.5, block adduct having polyoxyethylene chain bonded to branched lauryl group)
R ^2b —O— (EO) _s — (PO) _t —H (I ″)

Claims (3)

Nonionic surfactant (A) represented by the following general formula (I) 0.1% by weight or more and less than 1% by weight, containing a builder (B) and an alkenyl succinic acid metal salt (C), (A) The liquid detergent composition for dishwashers whose weight ratio of (C) and (C) is (C) / (A) = 2 / 3-10 / 1.
HO (CH (CH ₃ ) CH ₂ O) _a (CH ₂ CH ₂ O) _b (CH (CH ₃ ) CH ₂ O) _c H (I)
[In formula, a, b, and c are average addition mole number, and are the numbers of 1-350 each independently. ]   The liquid detergent composition for a dishwasher according to claim 1, wherein the weight ratio of (A) to (C) is (C) / (A) = 2/1 to 6/1.   The liquid detergent composition for dishwashers according to claim 1 or 2, wherein (C) is alkenyl succinic acid potassium salt.