Liquid detergent composition and cleaning method

Abstract

To provide a liquid cleaner composition that allows bubbles to quickly run out during rinsing and properly prevents metal corrosion.SOLUTION: A liquid cleaner composition comprises a component (A): an alkali metal hydroxide 0.1 mass% or more to 10 mass% or less, a component (B) a C10 to C14 fatty acid and / or a salt thereof 0.01 mass% or more to 0.45 mass% or less, a component (C) an amine oxide having a C8 to C18 alkyl group 0.5 mass% or more to 12 mass% or less, a component (D) a water-soluble calcium compound 0.03 mass% or more to 3 mass% or less, and a component (E) water. The mass ratio between the component (B) and the component (D), (B) / (D), is 0.005 or more to 15 or less.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to a liquid detergent composition that can be used mainly in cooking equipment and food processing equipment, which has foaming properties, suppresses corrosion of metals contained in the equipment, and has excellent foam-removal properties during rinsing, and a cleaning method using the detergent composition. [Background technology]

[0002] Conventionally, for cleaning walls and floors of kitchens and work areas in schools, hospitals, employee cafeterias, food processing plants, etc., particularly vertical hard surfaces such as tile and metal walls, foam cleaning methods using foam cleaning machines have been adopted for hygiene reasons. In foam cleaning, an undiluted solution of a cleaning agent or a diluted solution diluted with water at a ratio of more than 1 to 100, is introduced into a foam cleaning machine, and foam generated by hydraulic or air pressure is sprayed onto the surface to be cleaned. After a certain period of time, the surface is cleaned and / or disinfected by scrubbing with a brush or sponge, or by rinsing with water without scrubbing. In this type of foam cleaning, applying the cleaning agent in foam form increases the residence time of the cleaning agent on the surface to be cleaned, improving the cleaning and / or disinfecting effect.

[0003] Detergents used in foam cleaning have traditionally been developed with an emphasis on foaming ability and foam stability. However, there has been a problem in that the foam does not disappear easily during rinsing, requiring the use of a large amount of rinsing water. Therefore, from the perspectives of work convenience and water conservation, there is a demand for detergents that generate sufficient foam during cleaning, yet have good rinsing properties and foam disappear easily when rinsing with water. Furthermore, since the surfaces to be cleaned with the cleaning agent contain metals that easily corrode, such as copper and aluminum, the cleaning agent is required to have high detergency but low corrosiveness.

[0004] As examples of conventional detergent compositions, Patent Document 1 describes a liquid detergent composition containing an oxidizing agent, a fatty acid and / or its salt having a hydrocarbon group containing 14 to 22 carbon atoms, an alkyldimethylamine oxide and / or alkenyldimethylamine oxide having a hydrocarbon group containing 8 to 18 carbon atoms, and at least one selected from organic phosphonic acid and its salt, and condensed phosphoric acid and its salt. Patent Document 2 describes a liquid alkaline detergent composition containing a chlorine-based oxidizing agent, a fatty acid and / or its salt having 10 to 14 carbon atoms, decyldimethylamine oxide, and dodecyldimethylamine oxide. Patent Document 3 describes a foaming detergent composition for food and beverage manufacturing equipment containing an alkaline agent, an anionic surfactant, an alkyldimethylamine oxide having an alkyl or alkylene group having 12 to 18 carbon atoms, an aromatic sulfonate, a water-soluble calcium compound, and a sequestering agent. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2016-108552 [Patent Document 2] Japanese Patent Application Publication No. 2020-050694 [Patent Document 3] Japanese Patent Application Laid-Open No. 2010-150307 Summary of the Invention [Problem to be solved by the invention]

[0006] However, the compositions described in Patent Documents 1 and 2 do not have sufficient corrosion prevention properties when cleaning surfaces made of light metals such as aluminum. The composition described in Patent Document 3 exhibits metal corrosion prevention properties, but its foam removal during rinsing is not sufficient.

[0007] The present invention has been made in view of the above problems. That is, an object of the present invention is to provide a liquid detergent composition that has foaming properties, excellent corrosion prevention properties for metals used in cooking equipment, food processing equipment, etc., and excellent foam-removal properties during rinsing, and a cleaning method using the composition. [Means for solving the problem]

[0008] That is, the present invention is (1) 0.1% by mass or more and 10% by mass or less of an alkali metal hydroxide as component (A); (B) 0.01% by mass or more and 0.45% by mass or less of a fatty acid having 10 to 14 carbon atoms and / or a salt thereof as a component; (C) 0.5% by mass or more and 12% by mass or less of decyl dimethyl amine oxide and dodecyl dimethyl amine oxide as components; (D) 0.03% by mass or more and 3% by mass or less of a water-soluble calcium compound; a liquid detergent composition containing water as component (E), in which the mass ratio (B) / (D) of component (B) to component (D) is 0.005 or more and 1.1 or less, and the mass ratio (decyldimethylamine oxide) / (dodecyldimethylamine oxide) is 5 or more and 200 or less; (2) (B) contains lauric acid or a salt thereof and myristic acid or a salt thereof, and the mass ratio (lauric acid or a salt thereof) / (myristic acid or a salt thereof) is 0.05 or more; 40 A liquid detergent composition according to (1), which is: (3) The liquid detergent composition according to (1) or (2), wherein the mass ratio (decyldimethylamine oxide) / (dodecyldimethylamine oxide) is 5 or more and 30 or less. (4) The liquid detergent composition according to any one of (1) to (3), further comprising, as a component (F), at least one selected from phosphonic acid, phosphinic acid, phosphinocarboxylic acid, condensed phosphoric acid, and salts thereof; (5) The liquid detergent composition according to any one of (1) to (4), further comprising a chlorine-based oxidizing agent as component (G). (6) The liquid detergent composition according to any one of (1) to (5), wherein the water-soluble calcium compound is calcium acetate. (7) A cleaning method comprising spraying the liquid detergent composition according to any one of (1) to (6) in the form of foam onto an object to be cleaned, (8) The cleaning method according to (7), in which the liquid detergent composition is diluted in advance to a dilution ratio of more than 1 to 100 times, and / or is sprayed in a foam form onto the object to be cleaned while being diluted, It is characterized in that: [Effects of the Invention]

[0009] The liquid detergent composition of the present invention has foaming properties and excellent foam-removal properties during rinsing, which results in good water-saving and workability, and also exhibits excellent corrosion prevention properties for metals used in cooking equipment, food processing equipment, etc. DETAILED DESCRIPTION OF THE INVENTION

[0010] <Component (A)> The liquid detergent composition of the present invention contains an alkali metal hydroxide as component (A), which improves the detergency of the composition.

[0011] Examples of alkali metal hydroxides include lithium hydroxide, sodium hydroxide, and potassium hydroxide. Among these, it is preferable to use at least one of sodium hydroxide and potassium hydroxide.

[0012] The amount of component (A) is not particularly limited as long as the effects of the present invention are achieved, but is preferably 0.1 to 10% by mass, more preferably 0.5 to 8% by mass, and particularly preferably 1 to 5% by mass, of the total amount of the liquid detergent composition of the present invention. If the amount of component (A) is less than 0.1% by mass of the total amount of the liquid detergent composition of the present invention, the cleaning properties may be insufficient, while if it is more than 10% by mass, the storage stability of the composition may be reduced. The above blending amount of component (A) is the charge value when preparing the liquid detergent composition of the present invention.

[0013] <(B) component> The liquid detergent composition of the present invention contains a fatty acid having 10 to 14 carbon atoms and / or a salt thereof as component (B), which improves the foam-removal properties of the composition during rinsing.

[0014] Examples of fatty acids having 10 to 14 carbon atoms include capric acid (10 carbon atoms), undecylic acid (11 carbon atoms), lauric acid (12 carbon atoms), tridecylic acid (13 carbon atoms), myristic acid (14 carbon atoms), and salts thereof. Among these, from the viewpoints of achieving good foam retention after foaming and excellent foam-removal properties during rinsing, it is preferable to use one or more selected from lauric acid or myristic acid or salts thereof, and it is more preferable to use lauric acid or a laurate salt, and myristic acid or a myristate salt. As the laurate salt, sodium laurate or potassium laurate is preferred, and as the myristate salt, sodium myristate or potassium myristate is preferred.

[0015] One selected from lauric acid or a laurate salt and myristic acid or a myristate salt may be used in combination with a different fatty acid and / or a salt thereof. A specific example of the combination is a combination of one selected from lauric acid or a salt thereof and myristic acid or a salt thereof with capric acid or a salt thereof.

[0016] The amount of component (B) is not particularly limited as long as the effects of the present invention are achieved, but is preferably 0.01 to 0.45% by mass, more preferably 0.05 to 0.4% by mass, and particularly preferably 0.1 to 0.3% by mass, of the total amount of the liquid detergent composition of the present invention. If the amount of component (B) is less than 0.01% by mass, the foam-removal properties during rinsing may be insufficient, while if the amount is more than 0.45% by mass, the stability of the composition when diluted may be impaired. When a fatty acid salt is contained in component (B), the amount of component (B) in the detergent composition of the present invention is determined by converting the amount of the fatty acid salt into fatty acid. Furthermore, the above blend amount of component (B) in the detergent composition of the present invention is the charge value at the time of preparation. The dilution mentioned here is not particularly limited to a dilution ratio, but may be, for example, a dilution ratio of more than 1 to 100 times the original solution.

[0017] From the viewpoint of achieving excellent foam-removal properties during rinsing, the cleansing composition of the present invention preferably contains, as component (B), lauric acid or a salt thereof and myristic acid or a salt thereof, and in this case, the mass ratio (lauric acid or a salt thereof) / (myristic acid or a salt thereof) is preferably 0.05 or more and 40 or less. From the viewpoint of achieving better foam-removal properties during rinsing, the above mass ratio is more preferably 0.1 or more and 30 or less, even more preferably 1.0 or more and 20 or less, and particularly preferably 3.5 or more and 20 or less. The above values ​​are calculated as lauric acid when a laurate salt is contained, and as myristic acid when a myristate salt is contained.

[0018] <(C) component> The liquid detergent composition of the present invention contains, as component (C), an amine oxide having an alkyl group having 8 to 18 carbon atoms. This amine oxide improves the cleaning properties and foaming properties of the composition.

[0019] Examples of amine oxides having an alkyl group of 8 to 18 carbon atoms include octyldimethylamine oxide, nonyldimethylamine oxide, decyldimethylamine oxide, undecyldimethylamine oxide, dodecyldimethylamine oxide, tridecyldimethylamine oxide, tetradecyldimethylamine oxide, pentadecyldimethylamine oxide, hexadecyldimethylamine oxide, heptadecyldimethylamine oxide, octadecyldimethylamine oxide, etc. Among these, from the viewpoint of excellent cleaning properties and foaming properties, it is preferable to use one or more selected from octyldimethylamine oxide, decyldimethylamine oxide, dodecyldimethylamine oxide, and tetradecyldimethylamine oxide, it is more preferable to use one or two selected from decyldimethylamine oxide and dodecyldimethylamine oxide, and it is particularly preferable to use both decyldimethylamine oxide and dodecyldimethylamine oxide.

[0020] The amount of component (C) is not particularly limited as long as the effects of the present invention are achieved, but is preferably 0.5 to 12% by mass, more preferably 1 to 10% by mass, and particularly preferably 1.5 to 8% by mass, of the total amount of the liquid detergent composition of the present invention. If the amount of component (C) is less than 0.1% by mass of the total amount of the liquid detergent composition of the present invention, cleaning properties and foaming properties may be insufficient, while if it is more than 12% by mass, the composition may not rinse well. The above blend amount of component (C) in the detergent composition of the present invention is the charge amount at the time of preparation.

[0021] Furthermore, from the viewpoint of achieving excellent cleaning properties, foaming properties, and foam-removal properties during rinsing, it is preferable that component (C) is a mixture of decyl dimethylamine oxide and dodecyl dimethylamine oxide, with the mass ratio (decyl dimethylamine oxide) / (dodecyl dimethylamine oxide) being 4 or more and 200 or less. From the viewpoint of realizing good foaming properties and foam removal during rinsing, the above mass ratio is more preferably 5 or more. Furthermore, from the viewpoint of realizing better cleaning properties, the above mass ratio is more preferably 30 or less, and even more preferably 20 or less. The term "foaming ability" used herein means the ability to form fine foam containing an appropriate amount of water.

[0022] Furthermore, from the viewpoint of obtaining better foam retention when the liquid detergent composition of the present invention is sprayed in the form of foam onto a vertical surface, it is preferable that the liquid detergent composition of the present invention contains one or two compounds selected from decyl dimethylamine oxide and dodecyl dimethylamine oxide as component (C), and that the liquid detergent composition of the present invention contains lauric acid or a salt thereof as component (B).

[0023] <(D) component> The liquid detergent composition of the present invention contains a water-soluble calcium compound as component (D), which improves the metal corrosion prevention properties of the composition.

[0024] Examples of water-soluble calcium compounds include calcium chloride, calcium acetate, calcium carbonate, calcium bromide, calcium iodide, calcium gluconate, calcium lactate, calcium nitrate, etc. Among these, from the viewpoint of excellent metal corrosion prevention properties, it is preferable to use one or more selected from calcium chloride, calcium acetate, and calcium gluconate, and it is particularly preferable to use calcium acetate.

[0025] The amount of component (D) is not particularly limited as long as the effects of the present invention are achieved, but is preferably 0.03 to 3 mass% of the total amount of the liquid detergent composition of the present invention, more preferably 0.05 to 2 mass%, and particularly preferably 0.1 to 1 mass%. If the amount of component (D) is less than 0.03 mass% of the total amount of the liquid detergent composition of the present invention, the metal corrosion inhibitory effect may be insufficient, while if it is more than 3 mass%, the storage stability of the composition may be impaired. The above blend amount of component (D) in the detergent composition of the present invention is the charge amount at the time of preparation.

[0026] The ratio of component (B) to component (D) in the liquid detergent composition of the present invention, (B) / (D), must be 0.005 to 15 in mass ratio, preferably 0.01 to 5, more preferably 0.05 to 1. If the (B) / (D) ratio is less than 0.005, the foam-removal property during rinsing and storage stability may be impaired. On the other hand, if the (B) / (D) ratio exceeds 15, the metal corrosion prevention property and stability upon dilution may be impaired. The masses of the components (B) and (D) are the amounts charged when the liquid detergent composition is prepared. Similarly to the above, when component (B) contains a fatty acid salt, the value is determined from the amount of the fatty acid salt converted into fatty acid.

[0027] The cleaning composition for hard surfaces of the present invention contains water as component (E). Examples of water that can be used include tap water, softened water, purified water, RO water, ion-exchanged water, and distilled water. Examples of tap water include tap water from Arakawa Ward, Tokyo (pH = 7.6, total alkalinity (calcium carbonate equivalent) 40.5 mg / L, German hardness 2.3°DH (including calcium hardness 1.7°DH and magnesium hardness 0.6°DH), chloride ions 21.9 mg / L, sodium and its compounds 15 mg / L, nitrate nitrogen and nitrite nitrogen 1.2 mg / L, fluorine and its compounds 0.1 mg / L, boron and its compounds 0.04 mg / L, total trihalomethanes 0.016 mg / L, residual chlorine 0.4 mg / L, and organic matter (total organic carbon) 0.7 mg / L). The water as component (E) of the present invention is the remainder relative to the total amount of components (A) to (D) above, or the remainder relative to the total amount of components (A) to (D) and other components (components (F) to (G)).

[0028] In addition to the above components (A) to (E), the liquid detergent composition of the present invention may optionally contain at least one selected from phosphonic acid, phosphinic acid, phosphinocarboxylic acid, condensed phosphoric acid, and salts thereof as component (F), and a chlorine-based oxidizing agent as component (G).

[0029] By using at least one selected from phosphonic acid, phosphinic acid, phosphinocarboxylic acid, condensed phosphoric acid, and salts thereof as the component (F), the stability upon dilution and storage stability of the liquid detergent composition can be further improved.

[0030] Examples of the component (F) include 2-phosphonobutane-1,2,4-tricarboxylic acid, 1-hydroxyethylidene-1,1-diphosphonic acid, bis(poly-2-carboxyethyl)phosphinic acid, phosphinocarboxylic acid copolymer, tripolyphosphoric acid, pyrophosphoric acid, and salts thereof. Among these, 2-phosphonobutane-1,2,4-tricarboxylic acid, phosphinocarboxylic acid copolymer, and salts thereof are preferred from the viewpoint of excellent stability upon dilution and storage stability.

[0031] The amount of component (F) is not particularly limited as long as the effects of the present invention are achieved, but is preferably 0.2 to 7 mass% of the total amount of the liquid detergent composition of the present invention, more preferably 0.5 to 5 mass%, and particularly preferably 1 to 4 mass%. If the amount of component (F) is less than 0.2 mass% of the total amount of the liquid detergent composition of the present invention, improvement in stability upon dilution and storage stability may not be observed, while if the amount is more than 7 mass%, it may have a negative impact on metal corrosion prevention properties and foam-removal during rinsing. When component (F) contains a phosphonate, a phosphinate, a phosphinocarboxylate, or a condensed phosphate, the amount of component (F) in the detergent composition of the present invention is determined by converting the amount of component (F) into the amount of phosphonic acid, phosphinic acid, phosphinocarboxylic acid, or condensed phosphoric acid, respectively.

[0032] The use of a chlorine-based oxidizing agent as component (G) can further improve the cleaning properties of the liquid detergent composition and impart disinfecting properties to the composition. The chlorine-based oxidizing agent can be at least one selected from hypochlorous acid, chlorous acid, and salts thereof.

[0033] As the component (G), hypochlorous acid or an alkali metal salt of chlorous acid is preferred from the viewpoint of cleaning properties and disinfecting properties, sodium hypochlorite, potassium hypochlorite, and sodium chlorite are more preferred, and sodium hypochlorite is particularly preferred.

[0034] The amount of component (G) is not particularly limited as long as the effects of the present invention are achieved, but is preferably 0.1 to 8 mass% in terms of available chlorine concentration, more preferably 1 to 6 mass%, and particularly preferably 2 to 5 mass% in terms of available chlorine concentration, relative to the total amount of the liquid detergent composition of the present invention. If the amount of component (G) is less than 0.1 mass% in terms of available chlorine concentration, improvements in cleaning and disinfecting properties may not be observed, while if it exceeds 8 mass%, it may have a negative impact on metal corrosion prevention properties. The above blending amounts of the components (F) and (G) in the detergent composition of the present invention are the amounts charged at the time of preparation.

[0035] The liquid detergent composition of the present invention may contain other ingredients other than those described above, such as water-soluble solvents, chelating agents, disinfectants, pH adjusters, thickeners, fragrances, and colorants, within the range that does not impair the effects of the present invention. It is preferable that the liquid detergent composition does not contain enzymes.

[0036] Examples of the water-soluble solvent include lower alcohols such as ethanol, propanol, and butanol; glycols such as ethylene glycol, propylene glycol, and butylene glycol; and polyols such as glycerin, polyglycerin, and sorbitol.

[0037] Examples of the chelating agent include ethylenediaminetetraacetic acid or a salt thereof, hydroxyethylenediaminetriacetic acid or a salt thereof, diethylenetriaminopentaacetic acid or a salt thereof, triethylenetetraaminehexaacetic acid or a salt thereof, hydroxyethyliminodiacetic acid or a salt thereof, methylglycinediacetic acid or a salt thereof, glutamic acid diacetic acid or a salt thereof, iminodisuccinic acid or a salt thereof, and nitrilotriacetic acid or a salt thereof, and examples of the salts thereof include sodium salts and potassium salts.

[0038] Examples of disinfectants include thiazolines such as 5-chloro-2-methyl-4-isothiazolin-3-one, 2-methyl-4-isothiazolin-3-one, isothiazolin-3-one, 1,2-benzisothiazolin-3-one, and Nn-butyl-benzisothiazolin-3-one; hydantoins such as 1,3-dimethylol-5,5-dimethylhydantoin, 1 or 3-monomethylol-5,5-dimethylhydantoin, dimethylhydantoin, 1,3-dichloro-5,5-dimethylhydantoin, and 1,3-dichloroethylmethylhydantoin; and quaternary ammonium salts such as alkyldimethylammonium chloride, alkyldimethylbenzylammonium chloride, alkyldimethylhydroxyethylammonium chloride, and benzethonium chloride.

[0039] Examples of bases used as pH adjusters include monoethanolamine, diethanolamine, triethanolamine, monoisopropanolamine, diisopropanolamine, triisopropanolamine, etc., preferably monoethanolamine, triethanolamine, and monoisopropanolamine. Examples of acids used as pH adjusters include hydrochloric acid, acetic acid, propionic acid, lactic acid, malic acid, citric acid, benzoic acid, malonic acid, succinic acid, glutaric acid, adipic acid, and gluconic acid, preferably acetic acid, citric acid, p-toluenesulfonic acid, xylenesulfonic acid, and cumenesulfonic acid.

[0040] Examples of thickening agents include alkali-neutralized salts of polymeric polycarboxylic acids such as carboxyvinyl polymers, carboxymethyl cellulose, polyacrylic acid, and acrylic acid / maleic acid copolymers.

[0041] Examples of the fragrance include natural fragrances, synthetic fragrances, blends of these fragrances, etc. Examples of the coloring matter include natural coloring matter, synthetic coloring matter, and mixtures thereof.

[0042] The cleaning composition of the present invention can be obtained by a known production method, for example, by mixing and stirring components (A), (B), (C), and (D) (and, if necessary, components (F), (G), and (H), or other components described above) with water (component (E)). Component (B) and, if used, component (F), may be neutralized with an alkali metal hydroxide before being added to water as component (E) and then mixed.

[0043] The above-described detergent composition of the present invention can be used as a foaming detergent (foaming detergent) in the form of a stock solution or a diluted solution. The dilution ratio is not particularly limited, and the composition can be used by diluting it with water or the like in a range of more than 1 to 100 times. The cleaning composition of the present invention has good storage stability in the undiluted form, and also has good stability in the diluted solution diluted within the above range. Therefore, the cleaning composition of the present invention is easy to handle and can be used in a wide range of applications.

[0044] The pH of the detergent composition of the present invention is not particularly limited, but is preferably 9 or more and 14 or less, and more preferably 11 or more and 13 or less. The pH of the diluted solution of the detergent composition of the present invention is not particularly limited, but is preferably 9 or more and 14 or less, and more preferably 10 or more and 13 or less.

[0045] (Cleaning method) Next, the cleaning method of the present invention will be described. The cleaning method of the present invention is characterized in that the liquid detergent composition of the present invention described above is sprayed in the form of foam onto an object to be cleaned, thereby cleaning the object. The cleaning method of the present invention enjoys the excellent effects of the detergent composition of the present invention. Therefore, the cleaning method of the present invention can maintain good hygiene of the object to be cleaned, and is also excellent in terms of cleaning convenience and water conservation.

[0046] In the cleaning method of the present invention, the above-mentioned cleaning composition can be diluted in advance at a dilution ratio of more than 1 to 100 times, and / or can be sprayed in the form of foam onto the object to be cleaned while being diluted. The above-mentioned detergent composition has good storage stability in the undiluted form and also has excellent stability in the diluted form, and therefore can exhibit good cleaning properties whether it is diluted before use or diluted at the time of use.

[0047] The dilution is usually carried out with water. For example, the water used for dilution is generally assumed to be water containing hardness components, such as tap water, and from the viewpoint of the stability of the diluted solution, the water has a pH of preferably 1 to 20°DH, more preferably 1 to 10°DH. From the viewpoint of obtaining better foaming properties, the lower limit of the dilution ratio is more preferably 2 times or more. Furthermore, if the upper limit of the dilution ratio exceeds 100 times, good cleaning properties and foaming properties may not be obtained when the diluted cleaning solution is sprayed in foam form for cleaning. Furthermore, by adjusting the concentration of component (C) in the diluted cleaning solution to 0.003 mass% or more and 1 mass% or less, good cleaning properties, foaming properties, and foam-removal properties during rinsing can be obtained. From the viewpoint of cleaning properties and foaming properties, the concentration of component (C) in the diluted cleaning solution is preferably 0.01 mass% or more, more preferably 0.05 mass% or more. From the viewpoint of foam-removal properties during rinsing, the concentration of component (C) in the diluted cleaning solution is preferably 0.5 mass% or less, more preferably 0.3 mass% or less.

[0048] In the cleaning method of the present invention, the foaming means is not particularly limited. For example, the diluted cleaning solution obtained by diluting the detergent composition at a desired ratio may be charged into a foam washer and foamed by hydraulic or air pressure. Alternatively, the detergent composition may be charged into the foam washer, and the foam washer may be connected to a water supply means such as a tap via a hose, and water may be supplied to dilute and mix the foamed detergent composition, thereby foaming it. Specific examples of foam washer include devices that use an air-driven diaphragm pump to deliver the liquid, mix compressed air with the diluted foamed detergent composition, and foam and spray it. For example, the 910N Portable Foamer manufactured by DEMA can be used. The supply air pressure is 30 to 80 PSI. is preferable, and 40 to 60 PSI is more preferable.

[0049] The foamed detergent composition is sprayed onto the object to be cleaned. In the cleaning method of the present invention, the foam generated has good retention on the surface to be cleaned. In order to achieve more sufficient cleaning and disinfecting properties, it is advisable to allow the foam sprayed onto the object to be cleaned to remain on the surface to be cleaned for a certain period of time rather than immediately rinsing it off. From the viewpoint of workability, the retention time of the foam (the time from spraying to rinsing) is preferably 1 minute to 60 minutes, more preferably 1 minute to 30 minutes. Note that while the foam is retained on the surface to be cleaned, a small amount of water or the like may be added to the surface as appropriate. After the foam is allowed to remain on the surface to be cleaned for a certain period of time, the surface to be cleaned is rinsed with water to remove the foam (cleaning agent). The temperature of the rinsing water is preferably 10°C or higher and 70°C or lower, more preferably 20°C or higher and 60°C or lower. Tap water can be used as the rinsing water, and it may be heated to adjust to the above-mentioned preferred water temperature. Generally, rinsing is performed by hand using a hose or the like.

[0050] The objects to be cleaned by the cleaning method of the present invention are mainly hard surfaces, specifically the surfaces of production equipment in food and beverage manufacturing factories that produce processed meat products, processed seafood products, bread, confectionery, prepared dishes, beverages such as beer, juice, and dairy drinks, dairy products, frozen foods, retort foods, seasonings, mayonnaise, etc., walls and floors within factories, and hard surfaces such as equipment and devices in restaurant kitchens. [Example]

[0051] The present invention will be specifically explained below with reference to examples and comparative examples. The components used in the examples and comparative examples are shown below. In the following examples, "%" represents mass % unless otherwise specified, and the numerical values ​​of the compositions of the examples and comparative examples in the tables represent mass % of the pure components. The compounds used in the examples and comparative examples are listed below. In the table, the amounts of each component other than component (G) shown are those added at the time of charging, and the values ​​of component (G) shown are converted into effective chlorine concentrations. Furthermore, for component (B), component (B'-1), and component (F), the values ​​shown are converted into the amounts of the compounds before they form alkali metal salts.

[0052] Component (A) A-1: Potassium hydroxide A-2: Sodium hydroxide

[0053] (B) Component B-1: Potassium caprate (neutralized version of Lunac 10-98 manufactured by Kao Corporation) B-2: Potassium laurate (neutralized version of Kao Corporation's Lunac L-98) B-3: Sodium laurate (neutralized version of Lunac L-98 manufactured by Kao Corporation) B-4: Potassium myristate (neutralized version of Kao Corporation's Lunac MY-98) B-5: Sodium myristate (neutralized version of Kao Corporation's Lunac MY-98)

[0054] (B) Comparative ingredients B'-1: Potassium palmitate (neutralized version of Kao Corporation's Lunac P-95)

[0055] (C) Component C-1: Decyldimethylamine oxide C-2: Dodecyldimethylamine oxide C-3: Octyldimethylamine oxide C-4: Tetradecyldimethylamine oxide

[0056] (D) Component D-1: Calcium acetate monohydrate D-2: Calcium chloride dihydrate

[0057] (E) Component E-1: Ion-exchanged water

[0058] (F) Component F-1: Potassium 2-phosphonobutane 1,2,4-tricarboxylate (neutralized from Belclene 650 manufactured by BWA) F-2: Sodium 2-phosphonobutane 1,2,4-tricarboxylate (neutralized from Belclene 650 manufactured by BWA) F-3: Potassium phosphinocarboxylic acid copolymer (neutralized Belclene 400 manufactured by BWA) F-4: Sodium phosphinocarboxylic acid copolymer (neutralized Belclene 400 manufactured by BWA) F-5: Potassium tripolyphosphate

[0059] (G) Component G-1: Sodium hypochlorite G-2: Potassium hypochlorite

[0060] (H) Other ingredients H-1: Propylene glycol H-2: Sodium polyacrylate (weight average molecular weight 4,000, trade name: Sokalan PA25CL, manufactured by BASF) H-3: Sodium acrylic acid-maleic acid copolymer (weight average molecular weight: 1,900, trade name: ACUSOL 425N, manufactured by The Dow Chemical Company) H-4: Potassium orthosilicate

[0061] The compositions of each example were prepared by adding water (E) as component to a mixing tank so that the total weight of the composition was 100% by mass, and then blending components (A), (B), (C), and (D) (and, if necessary, components (F), (G), and (H)) into the mixing tank and thoroughly mixing and stirring.

[0062] Examples 1 to 60, Comparative Examples 1 to 9 The liquid detergent compositions shown in Tables 1 to 7 were prepared. Each liquid detergent composition was used to measure its cleaning performance, foam-removal during rinsing, foaming performance, stability of diluted detergent solutions, metal corrosion prevention, and storage stability, and was also measured for disinfection properties as needed. Tables 1 to 6 show the results for Examples 1 to 60, and Table 7 shows the results for Comparative Examples 1 to 9. Examples 11 to 14, 16 to 19, 25, 28, 56, and 59 are reference examples.

[0063] *1: Cleaning test (non-heated oil stains) Test Method: A 70mm x 60mm x 1mm stainless steel (SUS304) specimen was coated on one side with oil (10g beef tallow, 10g soybean oil, 0.25g monooleic acid glyceride, and 0.1g Sudan III dissolved in 60ml chloroform) and dried at 25°C for 2 hours to prepare a test specimen, which was then weighed. The specimen was immersed in 200ml of diluted cleaning solution at room temperature, prepared by diluting each liquid detergent composition to 3% by mass with hard water (75mg / L calcium carbonate equivalent [German hardness 4.2°DH]), left for 5 minutes, rinsed with ion-exchanged water, air-dried, and then weighed. The cleaning rate for unheated oily soils was calculated from the change in mass of the specimen before and after cleaning using the following formula and evaluated according to the following criteria.

[0064] The amount of dirt adhesion shown below is the value obtained by subtracting the mass of the test piece alone from the mass of the test piece to which oil has been applied as described above. Cleaning rate (%) = {(mass of test piece before cleaning - mass of test piece after cleaning) / (amount of dirt attached)} x 100 Evaluation criteria: ◎: Cleaning rate 100% to 80% or more ○: Cleaning rate: Less than 80% - 60% or more △: Cleaning rate less than 60% to 40% or more ×: Cleaning rate less than 40% The products were judged as practical with △, ○ and ◎.

[0065] *2: Cleaning test (heated oil stains) Test Method: A 70mm x 60mm x 1mm stainless steel (SUS304) specimen was coated on one side with oil (10g beef tallow, 10g soybean oil, 0.25g monooleic acid glyceride, and 0.1g Sudan III dissolved in 60ml chloroform) and baked at 180°C for 90 minutes to prepare a test specimen, which was then weighed. The test specimen was immersed in 200ml of diluted cleaning solution at room temperature, prepared by diluting each liquid detergent composition to 5% by mass with hard water (75mg / L calcium carbonate equivalent [German hardness 4.2°DH]), left for 5 minutes, rinsed with ion-exchanged water, air-dried, and then weighed. The cleaning rate for heated oil stains was calculated from the change in mass of the specimen before and after cleaning using the following formula and evaluated according to the following criteria.

[0066] The amount of dirt adhesion shown below is the value obtained by subtracting the mass of the test piece alone from the mass of the test piece to which oil has been applied as described above. Cleaning rate (%) = {(mass of test piece before cleaning - mass of test piece after cleaning) / (amount of dirt attached)} x 100 Evaluation criteria: ◎: Cleaning rate 100% to 80% or more ○: Cleaning rate: Less than 80% - 60% or more △: Cleaning rate less than 60% to 40% or more ×: Cleaning rate less than 40% The products were judged as practical with △, ○ and ◎.

[0067] *3: Test of foam removal during rinsing Test Method: Each liquid detergent composition was diluted to 5% by mass with hard water (calcium carbonate equivalent: 75 mg / L [German hardness: 4.2°DH]) at 20°C to prepare a cleaning solution. The solution was foamed into foam with a specific gravity of 0.15 g / cm3 using a DEMA 910N Portable Foamer and sprayed onto the bottom of a stainless steel box (stainless steel (SUS304)) (500 mm long, 700 mm wide) for 20 seconds. After one minute, the box was rinsed (using a shower nozzle) with hard water (calcium carbonate equivalent: 75 mg / L [German hardness: 4.2°DH]). The rinsing time until the foam disappeared around the drain outlet (diameter: 50 mm, with a 40-mesh polyethylene mesh inside) in the center of the bottom of the stainless steel box was evaluated according to the following criteria. Evaluation criteria: ◎: Less than 60 seconds ○: Over 60 seconds, less than 90 seconds △: 90 seconds or more, less than 120 seconds ×: 120 seconds or more The products were judged as practical with △, ○ and ◎.

[0068] *4: Foaming test <Test Method> Each liquid detergent composition was diluted to 3% by mass at 20°C with hard water equivalent to 75 mg / L of calcium carbonate (German hardness 4.2°DH). The cleaning solution was then foamed into foam with a specific gravity of 0.15 g / cm3 using a DEMA 910N Portable Foamer. The foam was then sprayed onto an area of ​​1 m vertically and 1 m horizontally on the vertical surface of a stainless steel plate (stainless steel (SUS304)) for 10 seconds, and the foam state was visually observed and evaluated according to the following criteria. Evaluation criteria: ◎: Watery and fine foam ○: Fine, not watery foam △: Watery, coarse foam ×: Not watery, coarse foam or no foam The products were judged as practical with △, ○ and ◎.

[0069] *5: Foam retention test Each foaming detergent composition was diluted to 3% by mass at 20°C with hard water equivalent to 75 mg / L of calcium carbonate (German hardness 4.2°DH). The cleaning solution was then foamed to a specific gravity of 0.15 g / cm3 using a DEMA 910N Portable Foamer. The foam was sprayed onto an area of ​​1 m long and 1 m wide on the vertical surface of a stainless steel plate (stainless steel (SUS304)) to produce a foam thickness of 2 cm or less. The appearance after 1 minute was photographed, and the vertical surface of the stainless steel plate was divided into 10 vertical and 10 horizontal sections and a grid pattern was drawn. The squares with foam attached were counted, and the proportion of squares with foam attached was taken as the foam retention rate, which was evaluated according to the following criteria. Evaluation criteria: ◎: Foam retention is 70% or more ○: Foam retention is 60% or more but less than 70% △: Foam retention is 50% or more but less than 60% ×: Foam retention is less than 50% The products were judged as practical with △, ○ and ◎.

[0070] *6: Stability test of diluted cleaning solution Test Method: Each liquid detergent composition was diluted to 3% by mass with hard water having a calcium carbonate equivalent of 75 mg / L (German hardness 4.2°DH) to prepare a cleaning solution. The diluted cleaning solution was visually observed within 15 minutes of preparation to determine whether it became cloudy, and the results were evaluated according to the following criteria. Evaluation criteria: ◎: No turbidity occurs ○: Slight turbidity occurs △: Slight cloudiness occurs, but there is no problem in use ×: Turbidity occurs The products were judged as practical with △, ○ and ◎.

[0071] *7: Metal corrosion prevention test (stainless steel, aluminum) The test specimens were stainless steel (SUS304) pieces measuring 70 mm long x 60 mm wide x 1 mm thick or aluminum (A5052P) pieces measuring 50 mm long x 30 mm wide x 2 mm thick, which were washed with a neutral detergent, treated with acetone, and dried. Each liquid detergent composition was diluted to 5% by mass with hard water (75 mg / L, calculated as calcium carbonate [German hardness 4.2°DH]) to prepare 60 ml of diluted cleaning solution, which was placed in a 70 ml glass bottle with a lid. The test specimen was immersed in the diluted cleaning solution and stored in an incubator at 25°C for 6 hours. The test specimen was then removed from the incubator, rinsed with ion-exchanged water, and air-dried. The appearance of the test specimen surface was visually observed and evaluated according to the following criteria. Evaluation criteria: ○: No corrosion △: Some corrosion is observed, but it is not a problem for use. ×: Corroded The evaluation was made as △ and ○ for practical use.

[0072] *8: Storage stability test Test Method: 100 g of each liquid detergent composition was placed in a polypropylene container and allowed to stand at -5°C, 25°C, or 40°C for one month, after which the appearance was observed and evaluated according to the following criteria. Evaluation criteria: ○: Stable with no separation or turbidity observed △: No overall separation, but some turbidity is observed ×: Separation or turbidity is observed The evaluation was made as △ and ○ for practical use.

[0073] *9: Bacterial sterilization test Test Method: Each liquid detergent composition was diluted with ion-exchanged water to 1%, 3%, or 5% by mass to prepare a diluted cleaning solution. 0.1 ml of a bacterial solution prepared by cultivating each of the following test strains in SCD bouillon medium was added to 10 ml of the diluted cleaning solution and the mixture was allowed to come into contact with the test strains for 1 minute at 25°C to prepare a test solution. 0.01 ml of this test solution was placed in one well of a 24-well microplate containing 1 ml of SCDLP bouillon medium containing 0.1% by mass of sodium thiosulfate, and the mixture was cultured at 37°C for 24 hours. After the culture was completed, the turbidity of the microplate was evaluated visually and rated according to the following criteria. Test strains: Escherichia coli NBRC3972 (10 CFU / mL level) and Staphylococcus aureus NBRC12732 (10 CFU / mL level) from the Institute for Fermentation were used. Evaluation criteria: ◎: No turbidity was observed in any of the 1 mass%, 3 mass%, and 5 mass% diluted cleaning solutions. ○: Only the 3% and 5% diluted cleaning solutions were not cloudy △: Only the 5% by mass diluted cleaning solution is not cloudy ×: All diluted cleaning solutions were cloudy. The products were judged as practical with △, ○ and ◎.

[0074] [Table 1]

[0075] [Table 2]

[0076] [Table 3]

[0077] [Table 4]

[0078] Table 5

[0079] Table 6

[0080] Table 7

Claims

1. (A) 0.1% by mass or more and 10% by mass or less of an alkali metal hydroxide; (B) 0.01% by mass or more and 0.45% by mass or less of a fatty acid having 10 to 14 carbon atoms and / or a salt thereof as a component; (C) 0.5% by mass or more and 12% by mass or less of decyl dimethyl amine oxide and dodecyl dimethyl amine oxide; (D) 0.03% by mass or more and 3% by mass or less of a water-soluble calcium compound; (E) Water as component wherein the mass ratio (B) / (D) of the component (B) to the component (D) is 0.005 or more and 1.1 or less, and the mass ratio (decyldimethylamine oxide) / (dodecyldimethylamine oxide) is 5 or more and 200 or less.

2. 2. The liquid detergent composition according to claim 1, comprising, as component (B), lauric acid or a salt thereof and myristic acid or a salt thereof, and wherein the mass ratio (lauric acid or a salt thereof) / (myristic acid or a salt thereof) is 0.05 or more and 40 or less.

3. The liquid detergent composition according to claim 1 or 2, wherein the mass ratio (decyldimethylamine oxide) / (dodecyldimethylamine oxide) is 5 or more and 30 or less.

4. The liquid detergent composition according to any one of claims 1 to 3, further comprising, as component (F), at least one selected from the group consisting of phosphonic acid, phosphinic acid, phosphinocarboxylic acid, condensed phosphoric acid, and salts thereof.

5. The liquid detergent composition according to any one of claims 1 to 4, further comprising a chlorine-based oxidizing agent as component (G).

6. The liquid detergent composition according to any one of claims 1 to 5, wherein the water-soluble calcium compound is calcium acetate.

7. A cleaning method comprising spraying the liquid detergent composition according to any one of claims 1 to 6 in the form of foam onto an object to be cleaned and cleaning the object.

8. 8. The cleaning method according to claim 7, wherein the liquid detergent composition is diluted in advance to a dilution ratio of more than 1 to 100 times and / or is sprayed in the form of foam onto the object to be cleaned while being diluted.

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