JP7122728B2 - ANTIBACTERIAL DETERGENT COMPOSITION FOR DISHWASHER - Google Patents

Description

INDUSTRIAL APPLICABILITY The present invention has excellent detergency, is excellent in preventing re-adhesion of dirt on tableware, suppresses the generation of pink slime in a dishwasher cabinet, and achieves both cleaning and hygiene in the cabinet. , relates to an antibacterial detergent composition for dishwashers.

Conventionally, detergents used in dishwashing machines have aimed primarily at improving the finish of objects to be washed, and have aimed to improve the technology. Therefore, there are not many products that are effective for sanitation inside the washer, and washing dishes in a dirty compartment is one of the causes of food poisoning. In addition, in many busy shops, pink dirt, that is, pink slime, occurs inside the washer. However, a satisfactory cleaning agent has not yet been obtained.

The term "pink slime" as used herein refers to deposits derived from bacteria that exhibit a pale pink color, have a moist surface, and are highly viscous. The place where it occurs is always high humidity, where water tends to stay, and where there is insufficient ventilation. This pink slime is sometimes called a biofilm in which rod-like microorganisms aggregate. Biofilm formation begins with the attachment of several types of bacteria to the surface, and the attached bacteria proliferate in a short period of time under high-temperature, high-humidity conditions using organic matter such as dirt as a nutrient source, and are presumed to be polysaccharides. It expands while producing mucous substances.

Until now, as shown in Patent Document 1, an antibacterial agent comprising a combination of a specific quaternary ammonium salt and a specific organic solvent has been known for the purpose of preventing and removing pink stains on hard surfaces. ing. This technology has identified that the main cause of pink stains is Methylobacterium rather than the previously known Rhodotorula yeast. It is considered useful for

However, bacteria of the genus Methylobacterium are bacteria that can inhibit growth in a general dishwasher with alkali and high temperatures without using a high-grade sterilant such as a quaternary ammonium salt. Therefore, even if it exerts antibacterial activity against bacteria of the genus Methylobacterium, it is insufficient to prevent pink stains occurring in the dishwasher.

Further, Patent Document 2 discloses a cleaning agent containing specific amounts of an alkaline agent, a specific polyacrylic acid or maleic acid-based polymer having a metal ion trapping ability, and a bleaching agent (here, sodium hypochlorite). The composition is proposed as exhibiting excellent bleaching effect on discolored stains such as tea stains, coffee stains, and the like.

Usually, detergents for dishwashers are composed of an alkali agent and a chelating agent, and these alone are insufficient to remove pink stains in the dishwasher compartment. Even if a bleaching agent is added to the cleaning agent, although the bleaching effect is exhibited, it is insufficient to remove the pink stains in the dishwasher.

Furthermore, in Patent Document 3, a sequestering agent, a nonionic surfactant, a cationic surfactant, at least one of an organic electrolyte polymer and a xylenesulfonate, an alkyl aliphatic dicarboxylic acid salt and It contains at least one of alkenyl aliphatic dicarboxylates, does not contain any of alkali metal hydroxides, carbonates, and silicates as an alkaline agent, has reduced environmental impact, and has excellent cleaning performance and recontamination. A liquid detergent composition has been proposed that has anti-foaming, low-foaming performance and storage stability in a wide range of temperature environments.

However, there is room for improvement in low-foaming properties, and furthermore, there is a growing demand for anti-redeposition properties for soils induced by cationic surfactants, so they are sufficient as detergent compositions. It's hard to say.

Further, Patent Document 4 discloses that a combination of a dioctyldimethylammonium salt, an alkaline agent, and a chelating agent in a specific ratio removes unsanitary stains formed by excrement without being affected by fibers. There has been proposed a liquid disinfecting detergent composition that exerts sufficient disinfecting power and detergency and hardly causes recontamination of textiles such as clothes.

This is a liquid disinfecting detergent composition that does not easily cause recontamination of textiles such as clothing, but if this composition is used as it is in a commercial dishwasher, the amount of dioctyldimethylammonium salt is large. Therefore, there is a concern that reattachment of dirt is induced.

JP 2012-36179 A JP-A-8-199194 Japanese Patent Application Laid-Open No. 2002-146400 JP-A-2009-91469

The present invention has been made in view of such circumstances, and has excellent washability, excellent prevention of re-adhesion of stains on dishes, and suppresses the generation of pink slime in the dishwasher. An object of the present invention is to provide an antibacterial detergent composition for dishwashers that satisfies both cleaning and sanitation in the refrigerator.

In order to achieve the above objects, the present invention provides an antibacterial detergent for dishwashers that contains the following components (A) to (D) in the following proportions relative to the total detergent composition and exhibits antibacterial activity: A composition is the subject matter.
(A) Dioctyldimethylammonium salt 0.01 to 2% by mass.
(B) Alkaline agent 5 to 50% by mass.
(C) Chelating agent 5 to 30% by mass.
(D) Scale inhibitor 0.1 to 10% by mass.

That is, the present inventors have developed an antibacterial detergent composition for dishwashers that has excellent detergency, is excellent in preventing redeposition of stains on tableware, and suppresses the generation of pink slime in the dishwasher. I did a lot of research to find what I was looking for.
Generally known as pink slime, it tends to grow in humid environments such as bathrooms and around water. As a countermeasure against pink slime, it was the mainstream to use an antibacterial agent that suppresses these constituent bacteria.
However, the environment inside the dishwasher is harsh with an alkaline cleaning liquid of 60° C. or higher, and the present inventor found that the above-mentioned bacteria cannot survive inside the dishwasher. As a result of collecting the pink slime generated in the dishwasher and identifying the isolated bacteria, it was possible to specify that the bacteria were gram-positive bacilli of the genus Gordonia. Therefore, the inventor of the present invention has conducted extensive research on Gordonia paraffinivorans, which has the highest homology among the Gordonia bacteria, as pink slime-producing bacteria in the dishwasher, and has developed an antibacterial detergent with high antibacterial activity. developed and arrived at the present invention.

As described above, the antibacterial detergent composition for dishwashers of the present invention contains the following components (A) to (D) in the following proportions relative to the total detergent composition, and exhibits antibacterial activity. Therefore, it has excellent detergency, is excellent in preventing the redeposition of dirt on dishes, suppresses the generation of pink slime in the dishwasher, and achieves both cleaning and hygiene inside the dishwasher. can be done.
(A) Dioctyldimethylammonium salt 0.01 to 2% by mass.
(B) Alkaline agent 5 to 50% by mass.
(C) Chelating agent 5 to 30% by mass.
(D) Scale inhibitor 0.1 to 10% by mass.

In addition, when the (D) scale inhibitor is at least one of an organic phosphorus scale inhibitor and a glycine scale inhibitor, the reattachment of stains is more effectively prevented, thus improving the washability. It is possible to improve the prevention against the generation of calcium carbonate scale, silica scale and the like.

When the antibacterial activity shows antibacterial activity against Gordonia bacteria, the generation of pink slime in the dishwasher can be more effectively suppressed.

Next, embodiments of the present invention will be described in detail. However, the present invention is not limited to the following embodiments.

First, the antibacterial detergent composition for dishwashers of the present invention (hereinafter sometimes referred to as "detergent composition") contains (A) 0.01 to 2 dioctyldimethylammonium salts relative to the entire detergent composition. % by mass, (B) 5 to 50% by mass of an alkaline agent, (C) 5 to 30% by mass of a chelating agent, and (D) 0.1 to 10% by mass of a scale inhibitor, while exhibiting antibacterial activity. is shown. Each component will be described below.

<(A) Component>
The dioctyldimethylammonium salt as component (A) is represented by the following general formula (1).

In addition, X in the above general formula (1)^-is Cl^-, I^-, Br^-or halogen ions such as HSO^Four-, NO^3-, H₂ PO^Four-is an inorganic acid counterion such as CH₃OSO^3-, C₂H._FiveSO^3-, CH₃CO^2-, CH₃C.₆H._FourSO^3-, CH₃SO^3-It is preferably an organic acid counterion such as Cl^-is preferably

Examples of the dioctyldimethylammonium salt of component (A) include dioctyldimethylammonium chloride and the like. Among them, dioctyldimethylammonium chloride is preferably used from the standpoint of easy availability.

The content of the dioctyldimethylammonium salt as component (A) is 0.01 to 2% by mass, more preferably 0.05 to 1% by mass, based on the total detergent composition. If the amount of component (A) is too small, the antibacterial effect is poor. because there will be more.

<(B) Component>
Examples of the alkali agent as the component (B) include alkali metal hydroxides such as sodium hydroxide and potassium hydroxide; silicates such as sodium silicate and potassium silicate; and carbonates such as sodium carbonate and potassium carbonate. Salts, alkanolamines and the like can be mentioned. Among them, alkali metal hydroxides such as sodium hydroxide and potassium hydroxide are preferably used in terms of storage stability and cost. These can be used alone or in combination of two or more.

The content of the alkaline agent, which is the component (B), is 5 to 50% by mass, more preferably 10 to 30% by mass, based on the total detergent composition. If the amount of component (B) is too small, the desired detergency may not be achieved. This is because, along with deterioration, the balance of each performance of the detergent composition deteriorates, and in particular, the synergistic effect with other components tends to saturate the detergency performance, and the storage stability tends to decrease.

<(C) Component>
Both phosphorus-based and non-phosphorus-based chelating agents can be used as the component (C) used in the cleaning composition. Examples of the phosphorus-based chelating agent include alkali metal phosphates, and examples of the phosphoric acid include orthophosphoric acid, polyphosphoric acid, pyrophosphoric acid, metaphosphoric acid, and hexametaphosphoric acid. Alkali metals to be combined with phosphoric acid include sodium and potassium. In particular, sodium tripolyphosphate is suitable among the above alkali metal phosphates. Examples of the non-phosphorus chelating agents include ethylenediaminetetraacetic acid, nitrilotriacetic acid, iminodiacetic acid, diethylenetriaminepentaacetic acid, N-hydroxyethylethylenediamineacetic acid, ethylenediaminetetrapropionacetic acid, methylglycinediacetic acid (MGDA), and triethylenetetramine. hexaacetic acid, ethylene glycol dietherdiaminetetraacetic acid, hydroxyethyliminodiacetic acid, cyclohexane-1,2-diaminetetraacetic acid, diencolic acid, dicarboxymethylglutaric acid, hydroxyethylethylenediaminetriacetic acid, ethylenediaminedisuccinic acid (EDDS), L-glutamic diacetic acid (GLDA), 3-hydroxy-2,2'-iminodisuccinic acid (HIDS), L-aspartic acid-N,N-diacetic acid (ASDA), heptogluconic acid (GH-NA), taurine-N , N-diacetic acid, gluconic acid, citric acid, water-soluble alkali metal salts such as sodium salts and potassium salts thereof, ethanolamine salts and ammonium salts thereof. Among the above non-phosphorus chelating agents, ethylenediaminetetraacetic acid, nitrilotriacetic acid, L-glutamic acid diacetic acid, methylglycine diacetic acid, water-soluble alkali metal salts such as sodium salts and potassium salts thereof, and ethanolamine salts , ammonium salts are preferred, and sodium salts are particularly preferred in terms of detergency and cost. These may be used alone or in combination of two or more.

In addition, the chelating agent which is the component (C) excludes the organophosphorus scale inhibitor described later.

The content of the chelating agent, component (C), is 5 to 30% by mass, preferably 8 to 25% by mass, and more preferably 10 to 20% by mass, based on the total detergent composition. If the amount of component (C) is too small, the balance with other ingredients will not only result in poor detergency for oil stains, but also cause scale formation. Conversely, if the amount of component (C) is too large, This is because not only is the storage stability lowered, but also the cost is disadvantageous.

<(D) Component>
An organic phosphorus scale inhibitor and a glycine scale inhibitor are preferably used as the (D) component scale inhibitor used in the cleaning composition. These can be used alone or in combination of two or more.

The organophosphorus scale inhibitors include, for example, ethane-1,1-diphosphonate, ethane-1,1,2-triphosphonate, 1-hydroxyethane-1,1-diphosphonate and derivatives thereof, ethane Phosphonic acid compounds such as hydroxy-1,1,2-triphosphonic acid, ethane-1,2-dicarboxy-1,2-diphosphonic acid, methanehydroxyphosphonic acid, or alkali metal salts and alkaline earth metal salts thereof, Ammonium salts or ethanolamine salts, phosphonocarboxylic acid compounds such as 2-phosphonobutane-1,2-dicarboxylic acid, 1-phosphonobutane-2,3,4-tricarboxylic acid, α-methylphosphonosuccinic acid, aminotrimethylphosphone acids, or their alkali metal salts, alkaline earth metal salts, ammonium salts, or ethanolamine salts. Among them, alkali metal salts are preferred. These can be used alone or in combination of two or more.

Examples of the glycine-based scale inhibitor include dihydroxyethylglycine and salts thereof. Examples of salts of these include sodium salts, potassium salts, ammonium salts, and ethanolamine salts. Among them, dihydroxyethylglycine sodium salt is preferred. These can be used alone or in combination of two or more.

Among such scale inhibitors of the component (D), 1-hydroxyethane-1,1-diphosphonic acid sodium salt, 1 -Phosphonobutane-2,3,4-tricarboxylic acid sodium salt and dihydroxyethylglycine sodium salt are preferably used.

The amount of the scale inhibitor, which is the component (D), is 0.1 to 10% by mass, more preferably 0.5 to 7% by mass, based on the total detergent composition. That is, if the amount of component (D) is too small, performance such as scale prevention, effect of reducing spots remaining on tableware, and dispersibility of dirt cannot be obtained sufficiently. If there is too much, there is a risk that the balance of each performance of the detergent composition will deteriorate, the storage stability will decrease, and the synergistic effect with other components will not be obtained any further.

In the detergent composition of the present invention, optional components other than the above components (A) to (D) include, for example, water, extenders such as sodium sulfate, and (A) such as didecyldimethylammonium chloride (DDAC). Antibacterial ingredients other than ingredients, bleaching agents such as sodium hypochlorite, pH adjusters, dyes, perfumes, metal corrosion inhibitors (rust inhibitors), deodorants, antistatic agents, and the like.

Examples of the water include tap water, soft water, ion-exchanged water, pure water, and purified water, preferably soft water, ion-exchanged water, and pure water. These can be used alone or in combination of two or more. The above-mentioned "water" refers to both the water of crystallization derived from each component constituting the liquid detergent composition, the water contained in the form of an aqueous solution, and the water added from the outside.

As described above, the detergent composition of the present invention contains the above components (A) to (D) and, if necessary, other optional components, and has antibacterial activity.

The above antibacterial activity refers to the property of suppressing the activity of bacteria, and among the antibacterial activities, the antibacterial activity against Gordonia bacteria effectively suppresses the occurrence of pink slime in the dishwasher. It is preferable because it is possible.

The antibacterial activity of the detergent composition of the present invention was measured with reference to "Sterilization Activity Test Method for Household Synthetic Detergents and Soaps (Detergent and Soap Fair Trade Council)" and Gordonia paraffinivorans (NBRC108238). can be shown by measuring the number of surviving bacteria after mixing with the diluted test composition and contacting the bacteria, and the fewer the surviving bacteria, the higher the antibacterial activity. indicates that
The antibacterial activity value is represented by the following formula (2), preferably showing a value of 1 or more, more preferably in the range of 2-3.
〔formula〕
Antibacterial activity value = Log (number of contact bacteria - number of viable bacteria) (2)

Here, the term "antibacterial" refers to suppressing the activity of bacteria and preventing further increase of the bacteria. It can also have a sterilizing effect that can be used.

Therefore, the detergent composition of the present invention is suitable for cleaning tableware having hard surfaces such as glass, ceramics, metals and plastics. In the present invention, the term "tableware" refers to any object having a degree of hardness that allows itself to maintain a predetermined shape and that can be used to serve food and drink. It does not include products, but is intended to include elastic resin surfaces.

In addition, the detergent composition of the present invention can be used not only for tableware, but also for automatic cleaning applications for cleaning utensils and containers in various manufacturing plants and processing plant buildings, plastic containers used for distribution, and the like. Furthermore, it can be preferably used for cleaning hard surfaces such as tiles and floors in food factories and food processing factories, cleaning containers such as glass bottles used for serving beverages, and cleaning metal surfaces. In particular, it is suitable for use in dishwashers in hotels, restaurants, schools, hospitals, restaurants, catering companies, company cafeterias, and the like. That is, the "tableware" in the present invention includes not only the literal "tableware" but also objects to be washed related to various food manufacturing and food processing as described above.

The form of the detergent composition is not particularly limited, but liquid, powder, and solid forms are preferably used from the viewpoint of storage stability and administration.
Here, the term "solid form" refers to a detergent composition obtained by dissolving raw materials with water and solidifying the detergent composition by bringing it into a supersaturated state. many. Although depending on the type of raw material, such a solid is formed with a composition of approximately 55 to 75% by mass of solids and the remainder of water. On the other hand, a powdery cleaning composition has almost no water content.

The concentration of the cleaning solution obtained by diluting the cleaning composition with water is preferably 0.03 to 0.5% by mass of the cleaning composition for washing tableware in a dishwasher. More preferably, it is 0.1 to 0.3% by mass. That is, if the content of the detergent composition is too low, it tends to be difficult to obtain the desired effect, and if it is too high, the rinsability tends to deteriorate.

A "dishwasher" is a machine that automatically washes dishes and the like, and includes door type, under counter type, rack conveyor type, flight conveyor type, and the like. In particular, the detergent composition of the present invention is preferably applied to door-type and conveyor-type detergents, which tend to generate pink slime.

EXAMPLES Next, examples will be described together with comparative examples, but the present invention is not limited to these.

Prior to Examples and Comparative Examples, the following components were prepared. The details of each prepared component and its effective pure content (%) are as follows, and the numerical values in the table indicate the pure content of each component. In addition, unless otherwise specified, "%" means a mass standard. Moreover, ion-exchanged water is used as the water in the detergent composition.

<Dioctyldimethylammonium salt (A)>
・ A-1: Dioctyldimethylammonium chloride (pure content 80%) (Bardac LF-80, manufactured by Lonza Japan)

<Alkaline agent (B)>
・ B-1: Sodium hydroxide (pure content 99%) (Toso Pearl, manufactured by Tosoh Corporation)
・ B-2: Potassium hydroxide (purity 48%) (48% liquid caustic potash, manufactured by Asahi Glass Co., Ltd.)
・ B-3: Potassium silicate (pure content 38%) (A potassium silicate, manufactured by Nippon Kagaku Kogyo Co., Ltd.)
・ B-4: monoethanolamine (90% pure) (monoethanolamine 90, manufactured by Nippon Shokubai Co., Ltd.)
・ B-5: Sodium carbonate (99% pure) (light soda ash, manufactured by Tokuyama)
・ B-6: Anhydrous sodium metasilicate (pure content 96%) (anhydrous sodium metasilicate, manufactured by Nippon Chemical Industry Co., Ltd.)

<Chelating agent (C)>
・ C-1: trisodium nitrilotriacetate (pure content 92%) (Krewat PC-C3, manufactured by Nagase ChemteX Corporation)
・ C-2: sodium tripolyphosphate (98% pure) (sodium tripolyphosphate, manufactured by Nippon Chemical Industry Co., Ltd.)

<Scale inhibitor (D)>
・ D-1: 1-hydroxyethane-1,1-diphosphonic acid (pure content 60%) (Dequest 2010, manufactured by Italmatch Japan)
・ D-2: Sodium dihydroxyethylglycinate (pure content 50%) (Cherest G-50, manufactured by Cherest)

<Optional component>
・ Sodium sulfate (pure content 100%) (neutral anhydrous mirabilite, manufactured by Nippon Kagaku Kogyo Co., Ltd.)
・ Didecyldimethylammonium chloride (DDAC) (pure content 80%) (Bardac 2280, manufactured by Lonza Japan)
・ Sodium hypochlorite (12% pure content) (sodium hypochlorite, manufactured by Nankai Chemical Co., Ltd.)

[Examples 1 to 14, Comparative Examples 1 to 10]
A detergent composition having the composition shown in Table 1 below (the unit of the numerical values in each table is "% by mass") was prepared, and the form of the detergent composition is shown. Anti-adhesion properties, anti-scaling properties, antibacterial properties, and storage stability were tested, and these evaluations are shown in Table 1 below. The test method and evaluation method for each item are as shown below.

<Washability>
<Test method>
The prepared detergent composition was diluted with ion-exchanged water so as to have the following detergent concentration to prepare a detergent solution. This washing liquid is set in the washing tank of a commercial dishwasher (SD104GS, manufactured by Nihon Washiki Co., Ltd.), and a set of 10 porcelain dishes to be washed is washed under the following operating conditions. was evaluated according to the following criteria. As stains, two types of stains, oil (beef tallow) stains and protein (egg yolk) stains, were prepared, and washing evaluation was performed for each of the stains.
*Operating conditions Detergent concentration: 0.2% by mass
Washing temperature: 60°C
Rinsing temperature: 80°C
Rinse water volume: 2.2L
Washing course: Standard washing cycle (washing: 50 seconds, rinsing: 10 seconds)
Tap water hardness: 60 mg/L (as _CaCO3 )
Grease stain: A porcelain dish with a diameter of 25 cm was used, on which 4 g/pan of refined beef tallow was adhered.
Protein stain: 4 g/plate of chicken egg yolk was applied to a porcelain dish with a diameter of 25 cm, dried at room temperature (about 23±2° C.) for 1 hour, and immersed in hot water at 40° C. for 30 minutes immediately before washing. used things.
<Evaluation criteria>
For greasy stains, oil red liquid was applied to the washed porcelain dish, and for protein stains, the degree of stain removal was determined by visual inspection as follows. The oil red liquid contains an azo dye, which dyes the oil red.
A: Very good (90% or more stain removal).
◯: Good (stain removal of 70% or more and less than 90%).
Δ: Good (50% or more and less than 70% dirt removal).
x: Poor (less than 50% stain removal).

<Low foaming>
<Test method>
The prepared detergent composition and 30 g of sufficiently stirred chicken eggs (whole eggs) were put into a commercial automatic dishwasher (SD104GS, manufactured by Nippon Washer Co., Ltd.) and operated under the following operating conditions. Then, foaming (foaming) of the cleaning liquid was visually evaluated according to the following evaluation criteria.
*Operating conditions Detergent concentration: 0.2% by mass
Washing temperature: 60°C
Rinsing temperature: 80°C
Rinse water volume: 2.2L
Washing course: Standard washing cycle (washing: 50 seconds, rinsing: 10 seconds)
Tap water hardness: 60 mg/L (as _CaCO3 )
Protein stain: Chicken egg (whole egg) 30g
<Evaluation criteria>
⊚: Bubbles are less than 50 mm from the liquid surface during operation, and the bubbles disappear quickly after operation.
◯: Bubbles are less than 50 mm from the liquid surface during operation, and the bubbles disappear within 1 minute after the end of operation.
Δ: Bubbles are 50 mm or more from the liquid surface during operation, but the bubbles disappear within 1 minute after the end of operation.
x: Regardless of the height of the foam during operation, the foam remains even after 1 minute from the end of the operation.
XX: Immediately after operation, the pump chews bubbles, making it difficult to operate.

<Redeposition prevention>
<Test method>
30 g of salad oil colored with oil red liquid together with the prepared detergent composition was put into a commercial automatic dishwasher (SD104GS, manufactured by Nihon Washiki Co., Ltd.), and operated under the following operating conditions to obtain a melamine detergent. The degree of adhesion of dirt to the plate was visually determined according to the following criteria.
*Operating conditions Detergent concentration: 0.2% by mass
Washing temperature: 60°C
Rinsing temperature: 80°C
Rinse water volume: 2.2L
Washing course: Standard washing cycle (washing: 50 seconds, rinsing: 10 seconds)
Tap water hardness: 60 mg/L (as _CaCO3 )
<Evaluation criteria>
⊚: No dirt adhered to the clean plate.
◯: Almost no dirt adhered to the clean plate.
Δ: Dirt adhered to the clean plate.
x: A large amount of dirt adhered to the clean plate.

<Scale prevention>
<Test method>
A test solution was prepared by diluting the detergent composition to 0.2% by mass with artificial hard water (total hardness: 150 mg/L). Pour 50 mL of this test liquid into a colorimetric tube with a capacity of 100 mL, hold it at 60 ° C. for 4 hours in an incubator (IS800, manufactured by Yamato Scientific Co., Ltd.), and then visually observe the test liquid and the colorimetric tube. The degree of scale generation suppression was evaluated according to. There are scales that float in the test solution and those that adhere to the bottom and sides of the colorimetric tube, both of which were evaluated.
<Evaluation criteria>
⊚: Very good (no scale was generated).
◯: Good (almost no scale was generated).
Δ: Acceptable (scale was generated).
x: Poor (remarkable scale adhesion).

<Antibacterial properties>
<Test method>
Gordonia paraffinivorans (NBRC108238) was used as a pink slime-producing bacterial model, and the antibacterial activity was evaluated by the following method. First, each test composition was diluted to 0.2% by weight with 50 ppm (as CaCO ₃ ) of hard water. Next, 1 mL of the bacterial solution adjusted so that the number of bacteria was 10 ⁵ was mixed with 99 mL of the test composition test solution diluted with sterilized water to bring the bacteria into contact. After 60 minutes at a contact temperature of 50° C., 1 mL of the contact liquid was taken out and added to 9 mL of drug-inactivated phosphate buffer. ), and the number of surviving bacteria was measured. Then, the difference between the number of contacted bacteria and the number of surviving bacteria obtained by the following formula (2) was defined as the antibacterial activity value, and evaluated according to the following four-grade evaluation criteria.
〔formula〕
Antibacterial activity value = Log (number of contact bacteria - number of viable bacteria) (2)
<Evaluation criteria>
A: Very good antibacterial activity (antibacterial activity value of 2 or more).
◯: Excellent antibacterial activity (antibacterial activity value of 1 or more and less than 2).
Δ: Slightly inferior antibacterial activity (antibacterial activity value of 0.5 or more and less than 1).
x: Poor antibacterial activity (antibacterial activity value less than 0.5).
In addition, (double-circle) and (circle) were evaluated as having practicality.

<Storage stability>
<Test method>
The prepared detergent composition was placed in a 100 mL glass bottle, placed in an atmosphere of 40° C. in a constant temperature bath (SLI-4S, manufactured by Sunaka Rika Kogyo Co., Ltd.), and stored in that state for one month. Similarly, the prepared cleaning agent composition was placed in a 100 mL glass bottle and placed in an atmosphere programmed from -5°C to 5°C in an incubator (MTH-2400, manufactured by SANYO). stored for months. The appearances of these samples were visually observed and evaluated according to the following evaluation criteria.
<Evaluation criteria>
⊚: Very good (after 1 month, there was no change in appearance such as turbidity, separation, deposition, discoloration, etc.).
◯: Good (after one month, slight changes in appearance such as turbidity, separation, precipitation, discoloration, etc. were observed).
Δ: Acceptable (after 2 weeks, slight changes in appearance such as turbidity, separation, precipitation, discoloration, etc. were observed).
x: Poor (immediately after blending, appearance changes such as turbidity, separation, precipitation, discoloration, etc.).

Thus, from Tables 1 and 2, the products of the present invention not only have excellent washability and do not re-deposit stains on the dishes, but also are causative bacteria of pink slime in the dishwasher. It can be seen that it is possible to achieve both cleaning and sanitation inside the refrigerator by suppressing the Gordonia paraffinivorans bacteria. On the other hand, it can be seen that it is difficult to achieve both detergency and antibacterial properties in the comparative example products.
In addition, the example products of the present invention exhibited the effect of suppressing not only Gordonia paraffinivorans but also food poisoning-causing bacteria.

The cleaning agent composition of the present invention is an antibacterial agent, especially a disinfectant, which has a high cleaning finish of dishes and can reduce wasteful operation of cleaning pink slime by maintaining hygiene in the dishwasher. Suitable for use as a dishwasher detergent.

Claims (3)

The following components (A) to (D) are contained in the following proportions with respect to the entire detergent composition, and the mass ratio of (C)/(D) is 1.3 to 50, and exhibits antibacterial activity An antibacterial detergent composition for dishwashers, characterized by:
(A) Dioctyldimethylammonium salt 0.05 to 2% by mass.
(B) Alkaline agent 5 to 50% by mass.
(C) alkali metal phosphates excluding organic phosphorus scale inhibitors, ethylenediaminetetraacetic acid, nitrilotriacetic acid, iminodiacetic acid, diethylenetriaminepentaacetic acid, N-hydroxyethylethylenediamineacetic acid, ethylenediaminetetrapropionacetic acid, methylglycinediacetic acid, Triethylenetetraaminehexaacetic acid, ethylene glycol dietherdiaminetetraacetic acid, hydroxyethyliminodiacetic acid, cyclohexane-1,2-diaminetetraacetic acid, diencolic acid, dicarboxymethylglutaric acid, hydroxyethylethylenediaminetriacetic acid, ethylenediaminedisuccinic acid , L-glutamic diacetic acid, 3-hydroxy-2,2′-iminodisuccinic acid, L-aspartic acid-N,N-diacetic acid, heptogluconic acid, taurine-N,N-diacetic acid, gluconic acid, citric acid and 5 to 30% by mass of at least one chelating agent selected from the group consisting of water-soluble alkali metal salts, ethanolamine salts and ammonium salts thereof ;
(D) 0.1 to 10% by mass of at least one scale inhibitor selected from the group consisting of organic phosphorus scale inhibitors and glycine scale inhibitors ; The antibacterial detergent composition for dishwashers according to claim 1, which exhibits antibacterial activity against Gordonia bacteria. A cleaning liquid containing 0.03 to 0.3% by mass of the antibacterial agent composition for dishwashers according to claim 1 or 2.