Liquid cleaning agent composition for hard surfaces

Abstract

To provide a liquid cleaning agent composition for hard surfaces that provides excellent foam retention at the time of foaming and provides superior rapid-acting cleaning performance against denatured oily stains, and provides superior cleaning performance for film oily stains.SOLUTION: A liquid cleaning agent composition for hard surfaces contains (a) 1 mass% or more and 10 mass% or less of an amine oxide-type surfactant, (b) 8 mass% or more and 20 mass% or less of monoethanolamine, and (c) an alkali metal hydroxide and water, wherein a pH at 25°C is 12.0 or more.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to a liquid detergent composition for hard surfaces and a method for cleaning hard surfaces, particularly to a liquid detergent composition and a method for cleaning hard surfaces in kitchens and surrounding areas where food is prepared by food service businesses, food processors, etc. [Background technology]

[0002] In kitchens and surrounding areas, particularly in food service establishments, cooking appliances such as ranges, ovens, and fryers, as well as the surrounding walls, floors, and ventilation fans, as well as food processing equipment, are prone to developing oily stains due to heat, sunlight, oxygen in the air, etc. In particular, the kitchens and food processing equipment of food service establishments that cook large amounts of food every day are prone to accumulating stubborn oily stains. To remove these stains, various cleaning agents for kitchens and surrounding areas have been developed and are being used, including those that use strong alkalinity to break down stains, combinations of solvents that take into account the affinity for denatured stains, and combinations of these base materials with various surfactants.

[0003] A new method of using the detergent has been developed, which involves foaming the detergent to make it easier to adhere to the surface and less likely to run off, and then leaving it for a certain period of time before rinsing, resulting in high cleaning power.In other words, in addition to the conventional method of scrubbing with a sponge, a new method has been proposed in which the detergent is sprayed into a foam form, left to adhere to the surface, and then rinsed without scrubbing. Furthermore, foam retention, i.e., foam retention without collapse, is an important property of a cleaning agent from the viewpoint of enhancing adhesion to hard surfaces after foam is sprayed.

[0004] Patent Document 1 discloses a liquid detergent composition for hard surfaces, which contains (a) 1 to 15 mass % of a monoalkyl ether of a specific polyalkylene glycol, (b) an amine oxide, (c) 0.01 to 15 mass % of a specific surfactant, and water, in which the mass ratio of component (c) / (component (b) + component (c)) is 0.01 / 1 to 1 / 1 and the pH at 25°C is 6 to 14. Patent Document 2 also discloses a liquid detergent composition containing (a) a specific compound having one type of alkyl group selected from a 2-ethylhexyl group, an isononyl group, and an isodecyl group, (b) a specific surfactant, (c) a hydrophobic organic solvent that is liquid at 20°C, and (d) water in specific proportions. Patent Document 3 discloses a cleaning composition for hard surfaces that contains specific amounts of (a) a specific glyceryl ether derivative, (b) a surfactant, (c) a builder, and (d) water. Patent Document 4 discloses a liquid detergent composition having a pH of 10 or higher (25°C), which contains (a) 0.01 to 10% by mass of an amine oxide, (b) 0.01 to 30% by mass of an alkaline agent, (c) a copper phthalocyanine blue dye, (d) an azo yellow dye, and water. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2012-126884 [Patent Document 2] Japanese Patent Application Laid-Open No. 2007-31692 [Patent Document 3] Japanese Patent Application Publication No. 7-3289 [Patent Document 4] Japanese Patent Application Laid-Open No. 2008-266552 Summary of the Invention [Problem to be solved by the invention]

[0006] Due to the generation of oil-laden smoke and soot during cooking, and the diffusion of oil from heated fryers, oil stains in the kitchens of restaurants and food processing equipment at food processors accumulate on hard surfaces around cooking equipment, ceilings, floors, and ventilation fans, despite regular cleaning. These stains then deteriorate and solidify due to the effects of heat, sunlight, and oxygen in the air. Depending on the degree of deterioration, deteriorated oils can become difficult to clean, even with the same surfactant. Oil stains that have thermally denatured to a resinous state (film-like oil stains), such as those found around trivets and gas ranges, are particularly difficult to clean because they adhere firmly to hard surfaces. In recent years, the food and beverage industry has been experiencing a labor shortage, which has led to a demand for shorter cleaning times, and therefore a need for fast-acting cleaning capabilities. The present invention provides a liquid detergent composition for hard surfaces that has excellent foam retention when foamed, and not only has excellent fast-acting detergency for denatured oily stains but also has excellent cleaning performance for film-like oily stains, and a method for cleaning hard surfaces. [Means for solving the problem]

[0007] The present invention relates to a liquid detergent composition for hard surfaces, which contains (a) 1% by mass or more and 10% by mass or less of an amine oxide surfactant, (b) 8% by mass or more and 20% by mass or less of monoethanolamine, and (c) an alkali metal hydroxide and water, and has a pH of 12.0 or more at 25°C.

[0008] The present invention also relates to a method for cleaning a hard surface, which comprises contacting the hard surface with a liquid detergent composition for hard surfaces, which contains (a) 1% by mass to 10% by mass of an amine oxide surfactant, (b) 8% by mass to 20% by mass of monoethanolamine, and (c) an alkali metal hydroxide and water, and has a pH of 12.0 or higher at 25°C. [Effects of the Invention]

[0009] According to the present invention, there are provided a liquid detergent composition for hard surfaces that has excellent foam retention after foaming, excellent fast-acting cleaning power for denatured oily stains, and also excellent cleaning performance for film-like oily stains, and a method for cleaning hard surfaces. DETAILED DESCRIPTION OF THE INVENTION

[0010] The mechanism by which the liquid detergent composition for hard surfaces of the present invention not only has excellent foam retention when foamed and excellent fast-acting cleaning power for denatured oily stains but also has excellent cleaning performance for film-like oily stains is not clear, but is presumed to be as follows. The inventors analyzed the component composition of the modified oil and noticed that it contains oleic acid. They speculate that because nonionic surfactants are not affected by the negative charge of fatty acids such as oleic acid and do not electrostatically repel fatty acids, the nonionic surfactants can quickly adsorb to the oil interface, thereby exhibiting fast-acting detergency for modified oil. In particular, the inventors discovered that the use of component (a), an amine oxide surfactant, results in high detergency. This is presumably because the amine oxide surfactant retains its cationic properties under highly alkaline conditions while its nonionic properties are strengthened. The liquid detergent composition for hard surfaces of the present invention is capable of converting the amine oxide surfactant into a cationic state due to the negative charge of oleic acid. Since the composition has a high pH, ​​it changes its properties to be more effective on lipophilic compositions than on water-soluble compositions, which is presumably further improving the fast-acting detergency of modified oils. Furthermore, the mechanism by which the liquid cleaning composition for hard surfaces of the present invention exhibits excellent foam retention upon foaming is unclear, but is speculated as follows. Generally, when a composition is used in foam form, the presence of the foam makes it easy to see where the composition has been applied, and good foam retention is desirable for the composition to enhance visibility. For the composition to be used in foam form using a spray or other method, low viscosity is important, and solvents are used to reduce viscosity. However, excessive use of solvents reduces the foam retention of the composition, causing the foam to quickly disappear. The inventors have discovered that compositions containing a specific amount of monoethanolamine (component (b)) maintain low viscosity while maintaining good foam retention. This is speculated to be due to the highly alkaline composition, in which monoethanolamine, a weak alkaline agent and compact substance, acts as a solvent before and during foaming, and continues to function as a solvent after foaming, while also acting as an alkaline buffer against the acid derived from the denatured oil, thereby freely changing its state at the interface. The liquid detergent composition for hard surfaces and the method for cleaning hard surfaces of the present invention are not limited to the above-mentioned mechanism of action. In the present invention, the properties of modified oils vary depending on the degree of modification, and modified oils with an advanced degree of modification, such as those used to remove baked-on stains, are sometimes called film oils, while modified oils with a lower degree of modification are sometimes called sticky oils. Although film oils and sticky oils have different properties, the liquid detergent composition for hard surfaces of the present invention has excellent cleaning performance for both modified oils. In the present invention, the foam retention property upon foaming may refer to the foam retention property upon foaming of the undiluted liquid of the liquid detergent composition for hard surfaces of the present invention.

[0011] <Liquid cleaning composition for hard surfaces> The liquid detergent composition for hard surfaces of the present invention contains (a) an amine oxide surfactant (hereinafter referred to as component (a)), (b) monoethanolamine (hereinafter referred to as component (b)), (c) an alkali metal hydroxide (hereinafter referred to as component (c)), and water, and has a pH of 12.0 or higher at 25°C.

[0012] <Component (a)> Component (a) is an amine oxide surfactant. Component (a) can be used alone or in combination of two or more. From the viewpoint of further enhancing fast-acting detergency for modified oils, component (a) is preferably an amine oxide surfactant having a chain hydrocarbon group having from 5 to 22 carbon atoms. From the viewpoint of further enhancing fast-acting detergency for modified oils, the number of carbon atoms in the chain hydrocarbon group of component (a) is preferably 5 or more, more preferably 8 or more, even more preferably 10 or more, and preferably 22 or less, more preferably 18 or less, even more preferably 16 or less. From the viewpoint of further enhancing detergency, the chain hydrocarbon group of component (a) is preferably an alkyl group or alkenyl group, more preferably an alkyl group. In this specification, when the chain hydrocarbon group or alkyl group has a carbonyl carbon atom at its terminal, the carbonyl carbon atom is also counted as the carbon number of the chain hydrocarbon group or alkyl group.

[0013] From the viewpoint of further enhancing fast-acting detergency for modified oils, the component (a) is preferably a compound represented by the following general formula (a1).

[0014] [ka]

[0015] [In the formula, R 1a is R 1a When a carbonyl carbon atom is bonded to the terminal of R, it is a hydrocarbon group having 4 to 21 carbon atoms. 1a If no carbonyl carbon atom is bonded to the end of R, it represents a hydrocarbon group having 5 to 22 carbon atoms. 2a and R 3a each independently represents an alkyl group having 1 to 3 carbon atoms; D represents an -NHC(=O)- group or a -C(=O)NH- group; E represents an alkylene group having 1 to 5 carbon atoms; and p represents 0 or 1.

[0016] In the above general formula (a1), R 1aFrom the viewpoint of further improving the cleaning property, R is preferably an alkyl group or an alkenyl group, and more preferably an alkyl group. When p is 1 and D is a -C(=O)NH- group, R 1a From the viewpoint of further improving the cleaning property, the number of carbon atoms in R is preferably 7 or more, more preferably 11 or more, and preferably 18 or less, more preferably 14 or less. When p is 0 or 1 and D is a -NHC(=O)- group, R 1a From the viewpoint of further improving the cleaning property, the number of carbon atoms is preferably 8 or more, more preferably 12 or more, and is preferably 18 or less, more preferably 14 or less. In the general formula (a1), D is preferably a —C(═O)NH— group, and E is preferably a propylene group. In the present invention, p is preferably 0 from the viewpoint of further improving the cleaning property. 2a , R 3a is preferably a methyl group having one carbon atom, from the viewpoint of further improving the cleaning property.

[0017] Preferred examples of component (a) include: (1) Alkyl (carbon number 5 to 22) dialkyl (carbon number 1 to 3) amine oxides: capryl dimethylamine oxide, capric dimethylamine oxide, lauryl dimethylamine oxide, myristyl dimethylamine oxide, palmityl dimethylamine oxide, stearyl dimethylamine oxide, (2) Amide group-containing amine oxides (compounds in which p=1 in general formula (a1)): caprylic acid amidopropyl dimethylamine oxide, capric acid amidopropyl dimethylamine oxide, lauric acid amidopropyl dimethylamine oxide, myristic acid amidopropyl dimethylamine oxide These may be used alone or in combination of two or more.

[0018] From the viewpoint of further enhancing cleaning properties, component (a) is preferably (1) an alkyl (having 5 to 22 carbon atoms) dialkyl (having 1 to 3 carbon atoms) amine oxide, more preferably one or more selected from capryl dimethylamine oxide, lauryl dimethylamine oxide, and myristyl dimethylamine oxide, even more preferably one or more selected from lauryl dimethylamine oxide and myristyl dimethylamine oxide, and even more preferably a combination of lauryl dimethylamine oxide and myristyl dimethylamine oxide.

[0019] <(b) Component> Component (b) is monoethanolamine. Since the acid dissociation constant pKa of monoethanolamine is 9.55, in the liquid detergent composition for hard surfaces of the present invention having a pH of 12.0 or higher, component (b) has the properties of an organic solvent rather than an alkaline agent, and its structure is also compact, so that effective penetration can be expected in terms of fast-acting detergency for denatured oils and cleaning for film-like oil stains.

[0020] <(c) component> Component (c) is an alkali metal hydroxide. Component (c) is used as an alkaline agent to further enhance the cleaning ability of film-like oil stains. Component (c) can be used alone or in combination of two or more. Component (c) is preferably one or more selected from sodium hydroxide and potassium hydroxide, more preferably sodium hydroxide. By including a large amount of the strong alkaline agent component (c), film-like oil stains can be decomposed, resulting in high cleaning ability.

[0021] <Water> The liquid detergent composition for hard surfaces of the present invention contains water, which may be, for example, deionized water, distilled water, RO water, ultrapure water, or tap water.

[0022] <Composition, optional ingredients, etc.> The liquid detergent composition for hard surfaces of the present invention contains component (a) in an amount of 1% by mass or more, preferably 1.5% by mass or more, more preferably 2% by mass or more, in order to further enhance cleaning properties, and 10% by mass or less, preferably 8% by mass or less, more preferably 6% by mass or less, in order to further enhance fast-acting detergency against modified oils.

[0023] The liquid detergent composition for hard surfaces of the present invention contains component (b) in an amount of 8% by mass or more, preferably 10% by mass or more, in order to further improve viscosity, foam retention, and film oil detergency, and in an amount of 20% by mass or less, preferably 18% by mass or less, more preferably 16% by mass or less, in order to further improve foam retention.

[0024] The liquid detergent composition for hard surfaces of the present invention contains component (c) in an amount of preferably 2% by mass or more, more preferably 3% by mass or more, in order to further enhance the cleaning ability for film oil stains, and preferably 20% by mass or less, more preferably 15% by mass or less, and even more preferably 10% by mass or less, in order to further enhance the fast-acting cleaning ability for modified oils. In the liquid detergent composition for hard surfaces of the present invention, the content of the alkali metal hydroxide (component (c)) in the liquid detergent composition for hard surfaces of the present invention is determined from the concentration of the free alkali metal ions remaining after the contained acid is consumed as an alkali metal salt. Therefore, the alkali metal that is counted as an acid salt is not included in the content of component (c).

[0025] In the liquid detergent composition for hard surfaces of the present invention, the mass ratio of the content of component (b) to the content of component (a) [(b) / (a)] is preferably 1.5 or more, more preferably 1.8 or more, even more preferably 2.1 or more, from the viewpoint of further improving foam retention, and is preferably 10 or less, more preferably 8 or less, even more preferably 7.5 or less.

[0026] The liquid detergent composition for hard surfaces of the present invention contains water. Water can be used as the remainder of the composition in an amount such that the total composition amount is 100% by mass. The liquid detergent composition for hard surfaces of the present invention contains water in an amount of preferably 50% by mass or more, more preferably 60% by mass or more, and preferably 90% by mass or less, more preferably 80% by mass or less, from the viewpoint of solubility.

[0027] The liquid detergent composition for hard surfaces of the present invention may optionally contain, within the range that does not impair the effects of the present invention, surfactants other than those corresponding to component (a), alkali agents other than those corresponding to components (b) and (c), organic solvents, hydrotropes, antigelling agents such as polyethylene glycol, thickeners such as polyacrylic acid, fragrances, dyes, pigments, disinfectants, preservatives, antibacterial agents, antiseptic and antifungal agents, and pH adjusters such as polycarboxylic acids having a molecular weight of 250 or less, such as citric acid and succinic acid.

[0028] Examples of surfactants other than those corresponding to component (a) include nonionic surfactants, anionic surfactants, cationic surfactants, and amphoteric surfactants other than those corresponding to component (a). Examples of alkaline agents other than those falling under component (b) and component (c) include inorganic alkaline agents (excluding those falling under component (c)) and organic alkaline agents (excluding those falling under component (b)). An example of an inorganic alkaline agent other than those falling under component (c) is sodium carbonate. An example of an organic alkaline agent other than those falling under component (b) is alkanolamines other than those falling under component (b). Hydrotropes include, for example, paratoluenesulfonic acid, metaxylenesulfonic acid, and salts thereof.

[0029] When the liquid detergent composition for hard surfaces of the present invention contains a surfactant other than that corresponding to component (a), the liquid detergent composition for hard surfaces of the present invention contains the surfactant other than that corresponding to component (a) in an amount of preferably more than 0 mass % in the composition from the viewpoint of further improving the cleaning ability for film oil stains, and preferably 5 mass % or less, more preferably 3 mass % or less, and even more preferably 1.5 mass % or less from the viewpoint of further improving the foam retention. The liquid detergent composition for hard surfaces of the present invention optionally contains a surfactant other than that corresponding to component (a), and it is preferable that the content of the surfactant other than that corresponding to component (a) in the composition is within the above-mentioned range.

[0030] Among the organic solvents, it is preferable to consider the content of the water-soluble organic solvent (d) (hereinafter referred to as component (d)) from the viewpoint of further improving foam retention. In the present invention, the water solubility of component (d) means that it dissolves in water at 20°C at a rate of 20 g / L or more.

[0031] Component (d) preferably contains one or more selected from the group consisting of a (poly)glycol ether compound having an alkyl group, phenyl group, or benzyl group having from 1 to 4 carbon atoms and one to four alkyleneoxy groups having from 2 to 4 carbon atoms, preferably 2 or 3 carbon atoms, ethylene glycol, propylene glycol, diethylene glycol, dipropylene glycol, ethanol, and propanol. Specific examples of the (poly)glycol ether compound include one or more selected from the group consisting of (poly)alkylene glycol monoalkyl ethers, (poly)alkylene glycol monophenyl ethers, and (poly)alkylene glycol monobenzyl ethers.

[0032] The (poly)glycol ether compound of component (d) having an alkyl group, phenyl group, or benzyl group having from 1 to 4 carbon atoms and from 1 to 4 alkyleneoxy groups having from 2 to 3 carbon atoms is preferably a compound represented by the following general formula (d1) from the viewpoint of appearance: R 1d -O-(R 2d O) t -H (d1) [In the formula, R 1d is an alkyl group having 1 to 4 carbon atoms, a phenyl group, or a benzyl group, and R 2d O is an alkyleneoxy group having 2 or 3 carbon atoms, and t is R 2d The number of moles of O added is 1 or more and 4 or less.

[0033] In general formula (d1), R1d From the viewpoint of further enhancing foaming properties, R is an alkyl group having 1 to 4 carbon atoms, a phenyl group, or a benzyl group, and is preferably an alkyl group having 1 to 4 carbon atoms. 2d From the viewpoints of further enhancing detergency and transparency of appearance, O is an alkyleneoxy group having 2 or 3 carbon atoms, i.e., a group selected from an ethyleneoxy group and a propyleneoxy group, and t is a number of 1 or more and 4 or less, preferably 2 or less.

[0034] Specific examples of component (d) include one or more selected from 1-methoxy-2-propanol, dipropylene glycol monomethyl ether, 2-ethoxyethanol, 2-(2-ethoxyethoxy)ethanol, ethylene glycol monobutyl ether, diethylene glycol monobutyl ether (also known as butyl carbitol), triethylene glycol monobutyl ether, 1-butoxy-2-propanol, dipropylene glycol mono-n-butyl ether, 2-isobutoxyethanol, 2-(2-isobutoxyethoxy)ethanol, (mono-, di-, or tri)ethylene glycol monophenyl ether, (mono-, di-, or tri)ethylene glycol monobenzyl ether, ethylene glycol, propylene glycol, diethylene glycol, dipropylene glycol, ethanol, and propanol. From the viewpoint of further enhancing the detergency of the modified oil when used in a diluted state, dipropylene glycol monomethyl ether, One or more selected from ethylene glycol monobutyl ether, diethylene glycol monobutyl ether, triethylene glycol monobutyl ether, 1-butoxy-2-propanol, dipropylene glycol mono-n-butyl ether, 2-isobutoxyethanol, 2-(2-isobutoxyethoxy)ethanol, ethylene glycol, propylene glycol, diethylene glycol, dipropylene glycol, ethanol, and propanol are preferred, and one or more selected from dipropylene glycol monomethyl ether, ethylene glycol monobutyl ether, diethylene glycol monobutyl ether, triethylene glycol monobutyl ether, dipropylene glycol mono-n-butyl ether, 2-(2-isobutoxyethoxy)ethanol, ethylene glycol, propylene glycol, diethylene glycol, dipropylene glycol, ethanol, and propanol are more preferred.

[0035] When the liquid detergent composition for hard surfaces of the present invention contains component (d), the liquid detergent composition for hard surfaces of the present invention preferably contains more than 0% by mass of component (d) in order to further improve the cleaning ability for oily film stains, and preferably contains 5% by mass or less, more preferably 2% by mass or less, even more preferably 1% by mass or less, and even more preferably 0.5% by mass or less in order to further improve foam retention, or is essentially free of component (d). By including component (d) in the composition, the cleaning ability for oily film stains is improved, and by further incorporating a large amount of monoethanolamine (b), a composition with excellent foaming properties and excellent foam retention can be obtained. The liquid detergent composition for hard surfaces of the present invention optionally contains component (d), and it is preferable that the content of component (d) in the composition is within the above range. Furthermore, the liquid detergent composition for hard surfaces of the present invention may be a composition that does not contain component (d), i.e., the content of component (d) in the liquid detergent composition for hard surfaces of the present invention may be 0 mass %.

[0036] From the viewpoint of stability, the liquid detergent composition for hard surfaces of the present invention preferably contains no more than 1% by mass of a hydrophobic organic solvent such as a terpene hydrocarbon or paraffin, more preferably no more than 0.5% by mass, and even more preferably contains no hydrophobic organic solvent except for fragrances. The hydrophobic organic solvent of the present invention has a solubility of no more than 5 g / L in water at 20°C.

[0037] As a preferred embodiment of the liquid detergent composition for hard surfaces of the present invention, (a) an amine oxide surfactant in an amount of 1% by mass or more and 8% by mass or less in the composition; (b) monoethanolamine in an amount of 8% by mass or more and 20% by mass or less in the composition; (c) an alkali metal hydroxide in the composition in an amount of 2% by mass or more and 10% by mass or less; 60% by mass or more and 89% by mass or less of water in the composition, Optionally, surfactants, organic solvents, fragrances, pigments, antibacterial agents, and antifungal agents other than those corresponding to component (a) are contained, In the composition, the content of surfactants excluding those corresponding to the component (a) is 5% by mass or less, the content of the organic solvent is 2% by mass or less, and a liquid detergent composition for hard surfaces having a pH of 12.0 or more at 25°C can be mentioned. In the composition, the preferred embodiments of the component (a), component (b), component (c) and optional components are the same as the above-mentioned preferred embodiments. Also, the preferred content of each component is also the same as the preferred content of each of the above-mentioned preferred components. Further, the organic solvent may be the component (d), and fragrances, pigments, antibacterial and antifungal agents are used in predetermined contents.

[0038] The pH at 25°C of the liquid detergent composition for hard surfaces of the present invention is 12.0 or more, preferably 12.5 or more, more preferably 13 or more, and for example 14 or less, from the viewpoint of further enhancing detergency. This pH is measured according to the following pH measurement method.

[0039] When the alkalinity of the liquid detergent composition for hard surfaces of the present invention is high, it is difficult to measure a pH exceeding 14. In confirming that the liquid detergent composition for hard surfaces of the present invention is highly alkaline, it is preferable that the pH at 25°C of a 1% by mass aqueous solution of the liquid detergent composition for hard surfaces of the present invention diluted with deionized water is 12 or more, and preferably 14 or less. Therefore, the pH at 25°C of an aqueous solution containing 1% by mass of the liquid detergent composition for hard surfaces of the present invention (that is, an aqueous solution obtained by diluting the liquid detergent composition for hard surfaces 100-fold with water) is preferably 12 or more, more preferably 12.5 or more, still more preferably 13 or more, and preferably 14 or less, from the viewpoint of further enhancing detergency. The aqueous solution may be an aqueous solution obtained by diluting the liquid detergent composition for hard surfaces of the present invention with deionized water. This pH is measured according to the following pH measurement method.

[0040] <pH Measurement Method> A pH measurement combination electrode (Horiba, Ltd., glass ground sleeve type) is connected to a pH meter (Horiba, Ltd., pH / ion meter F-23) and the power is turned on. A saturated potassium chloride aqueous solution (3.33 mol / L) is used as the pH electrode internal solution. Next, 100 mL of pH 4.01 standard solution (phthalate standard solution), pH 6.86 (neutral phosphate standard solution), and pH 9.18 standard solution (borate standard solution) are each filled into a beaker and immersed in a thermostatic bath at 25°C for 30 minutes. The pH measurement electrode is immersed in the thermostatically adjusted standard solutions for 3 minutes, and calibration is performed in the following order: pH 6.86 → pH 9.18 → pH 4.01. The sample to be measured is adjusted to 25°C, the pH meter electrode is immersed in the sample, and the pH is measured after 1 minute.

[0041] The viscosity of the liquid cleaning composition for hard surfaces of the present invention at 25°C is preferably 50 mPa·s or less, more preferably 30 mPa·s or less, even more preferably 20 mPa·s or less, and even more preferably 15 mPa·s or less, from the viewpoint of further improving spray dischargeability. The viscosity is measured using a Brookfield viscometer, using a rotor recommended for the viscosity to be measured from among rotors No. 1 to No. 3, at 60 r / min, and the reading is the reading 1 minute after the start of measurement. The liquid cleaning composition for hard surfaces is measured at a temperature adjusted to 25±1°C. If there are multiple rotors that satisfy the conditions, the value measured using the rotor with the smaller number is used.

[0042] The liquid detergent composition for hard surfaces of the present invention may be a liquid detergent composition for hard surfaces of hard articles. The hard articles are preferably tableware and / or hard articles for use in the kitchen. Specific examples of hard surfaces to be cleaned with the liquid detergent composition for hard surfaces of the present invention include the surfaces of the following hard articles. Hard items around the kitchen are items used around the kitchen, specifically: (1) Storage areas for food, tableware, and cooking utensils, such as refrigerators and cupboards, (2) Food preparation areas such as fryers, trivets, ovens, extractor fans, drains, countertops, range hoods, sinks, gas ranges, and microwave ovens; (3) Floors and walls around the storage area and cooking area In the present invention, these are referred to as "hard kitchen items" for convenience. In addition, the tableware, specifically, (i) Plates, bowls, and other tableware; (ii) Storage containers such as Tupperware and bottles, (iii) Cooking utensils such as knives, cutting boards, pots, frying pans, and fish grills; (iv) Food processors, mixers, and other cooking appliances In the present invention, these are referred to as "tableware" for convenience. Furthermore, the liquid detergent composition for hard surfaces of the present invention is preferably intended for use on items selected from cooking areas, tableware, storage containers, cooking utensils, and kitchen appliances, and more preferably for use on items selected from fryers, trivets, gas ranges, ovens, extractor fans, plates, bowls, Tupperware, bottles, knives, cutting boards, pots, frying pans, fish grills, food processors, and mixers.

[0043] The liquid detergent composition for hard surfaces of the present invention can be used to effectively clean tableware and / or kitchen hard objects made of plastics (including silicone resins, etc.), metals, ceramics, wood, and combinations thereof. The liquid detergent composition for hard surfaces of the present invention can effectively clean oily stains containing denatured oils, particularly heat-denatured oils, adhering to the tableware and / or kitchen hard objects.

[0044] <How to clean hard surfaces> The present invention provides a method for cleaning a hard surface, which comprises contacting the hard surface with a liquid detergent composition for hard surfaces, the composition containing (a) an amine oxide surfactant (component (a)) in an amount of 1% by mass to 10% by mass, (b) monoethanolamine (component (b)) in an amount of 8% by mass to 20% by mass, (c) an alkali metal hydroxide (component (c)), and water, and having a pH of 12.0 or higher at 25°C. The method for cleaning a hard surface of the present invention may be a method for cleaning a hard surface in which the liquid detergent composition for hard surfaces of the present invention is brought into contact with the hard surface.

[0045] In the method for cleaning a hard surface of the present invention, the hard surface may be the surface of a hard article. Specifically, the hard surface may be any of the hard surfaces listed above as targets to be cleaned with the liquid detergent composition for hard surfaces of the present invention. In the method for cleaning hard surfaces of the present invention, preferred aspects of the liquid detergent composition for hard surfaces of the present invention, such as components (a) to (c), water, and optional components contained in the liquid detergent composition for hard surfaces of the present invention, as well as the contents and pH of these components, are the same as those described for the liquid detergent composition for hard surfaces of the present invention.

[0046] When the liquid detergent composition for hard surfaces of the present invention (also referred to as undiluted solution) is brought into contact with oily stains containing denatured oil, particularly heat-denatured oil, the denatured oil is broken down into small pieces and floats off the object (e.g., tableware and / or hard items around the kitchen). Methods for bringing the liquid detergent composition for hard surfaces of the present invention into contact with the object include, for example, applying or spraying the composition in a foam state. Therefore, in the cleaning method of the present invention, denatured oil stains can be easily removed without applying external force such as scrubbing, for example, by leaving the object for a certain period of time and then rinsing it with water. However, in the cleaning method of the present invention, the object surface may be cleaned by applying external force such as scrubbing.

[0047] In the cleaning method of the present invention, the liquid detergent composition for hard surfaces can be brought into contact with the surface of a hard article having oily soiling containing denatured oil, particularly heat-denatured oil, without dilution, and then rinsed without scrubbing. In the cleaning method of the present invention, the liquid detergent composition for hard surfaces can be brought into contact with the surface of a hard article having oily stains containing, for example, denatured oil, particularly heat-denatured oil, without being diluted, and can be cleaned without applying external force such as mechanical force. Cleaning the surface of a hard article without applying an external force such as a mechanical force means, for example, that no operation is performed to intentionally apply an external force for cleaning to the object other than contacting the composition. For example, the natural flow of the contacted composition down the surface of the hard article, or the transmission of vibrations not intended for cleaning to the hard article, can be understood as cleaning the surface of a hard article without applying an external force such as a mechanical force. "Bringing the liquid detergent composition for hard surfaces into contact without dilution with the surface of a hard article having oily soiling containing denatured oil, particularly heat-denatured oil," means that the detergent composition is not brought into contact with a hard article having oily soiling containing liquid oil derived from food after intentionally diluting it with water, etc. For example, when the liquid detergent composition for hard surfaces is brought into contact with a hard article having water droplets or the like attached thereto, or when water droplets adhere to the hard article after the liquid detergent composition for hard surfaces has been brought into contact with the hard article, this can be understood as meaning that the liquid detergent composition for hard surfaces has been brought into contact without dilution with a hard article having oily soiling containing denatured oil, particularly heat-denatured oil, attached thereto. After leaving the hard article, the hard article is rinsed with water. When rinsing, external force (physical force) may be applied by hand or the like, or simply rinsed with running water.

[0048] In the cleaning method of the present invention, the liquid detergent composition is brought into contact with a hard article having oily soiling containing a denatured oil, particularly a heat-denatured oil, followed by leaving the article to stand and rinsing with water. When rinsing with water after contact, external force such as mechanical force may or may not be applied using a flexible material such as a sponge or fingers.

[0049] In the cleaning method of the present invention, the liquid detergent composition for hard surfaces of the present invention may be diluted with water and used in the cleaning method. In the cleaning method of the present invention, when the liquid detergent composition for hard surfaces is diluted with water, the dilution ratio is preferably more than 1, more preferably 2 or more, even more preferably 4 or more, even more preferably 10 or more, and preferably 100 or less, more preferably 80 or less, even more preferably 20 or less.

[0050] In the cleaning method of the present invention, from the viewpoint of enhancing detergency, after the liquid detergent composition for hard surfaces contacts a hard object, it is preferably left for 10 seconds or more, more preferably 20 seconds or more, still more preferably 30 seconds or more, even more preferably 40 seconds or more, even more preferably 50 seconds or more, even more preferably 1 minute or more, and from the viewpoint of reducing the cleaning load on the user, it is preferably left for 60 minutes or less, more preferably 30 minutes or less, still more preferably 20 minutes or less, even more preferably 10 minutes or less, even more preferably 5 minutes or less. In this case, the start time of leaving can be the time when the composition first contacts the hard object. The temperature during leaving is room temperature, for example, 10°C or higher and 30°C or lower.

Examples

[0051] Using the following components (a) to (d), etc., a liquid detergent composition for hard surfaces shown in Table 1 was prepared and evaluated for the following items. The results are shown in Table 1. The mass percentages of each component in Table 1 are all values based on the pure component conversion values. When the pH of the liquid detergent composition for hard surfaces shown in Table 1 was measured by the same method as the <pH measurement method> above, the measured pH value showed 14, which is the upper limit value of the pH meter. From this, it is shown that the pH of the composition shown in Table 1 is at least 14. Also, when the pH of an aqueous solution containing 1% by mass of the liquid detergent composition for hard surfaces shown in Table 1 at 25°C was measured by the same method, the pH of all the aqueous solutions exceeded 12.

[0052] <(a) component> · Nonionic surfactant: Unitol 20N, lauryldimethylamine oxide, manufactured by Kao Corporation, in the general formula (a1), R 1a is a lauryl group, R 2a , R 3a is a methyl group, and a compound with p = 0 <(a’) component> · Anionic surfactant: Emal 2F-HP, sodium lauryl sulfate, manufactured by Kao Corporation Cationic surfactant: Kotamin 20W, lauryltrimethylammonium chloride, manufactured by Kao Corporation <(b) Component> Monoethanolamine: Nippon Shokubai Co., Ltd. <(c) component> Sodium hydroxide: Nankai Chemical Co., Ltd. <(d) component> BDG-NS: Butyl carbitol (diethylene glycol monobutyl ether), manufactured by Nippon Nyukazai Co., Ltd. <Water> Deionized water

[0053] (1) Fast-acting degreasing effect on denatured oils (2 min) The fast-acting modified oil cleaning ability of each hard surface liquid detergent composition in Table 1 was evaluated by the following method. This evaluation was conducted to evaluate the fast-acting modified oil cleaning ability for sticky oil stains with a relatively low degree of modification that adhere to the periphery of fryers, etc. (i) Pretreatment of SUS plate A SUS304 test piece (1.0 × 25 × 70 mm) manufactured by Engineering Test Services Co., Ltd. was washed with a sponge using neutral dishwashing detergent, then rinsed (once with tap water and twice with deionized water) and dried in an electric dryer at 80°C. (ii) Preparation of modified oil First, rapeseed oil (manufactured by Fujifilm Wako Pure Chemical Industries, Ltd.) was placed in a petri dish and heated in an oven at 180°C for 24 hours to prepare a thermally denatured oil. Next, the prepared thermally denatured oil and chloroform were mixed in a ratio of 20 g of thermally denatured oil to 60 mL of chloroform to prepare a chloroform solution containing the thermally denatured oil. (iii) Evaluation of fast-acting detergency for modified oils A chloroform solution containing modified oil was applied at 1 mg / cm2 to an area of ​​25 x 50 mm on one side of a SUS plate. 2 The oil was poured once using a dropper so that the surface was covered with oil. The surface was left to dry flat overnight with the oily side facing up. Next, three SUS plates were placed on a balance dish BD-3 (140 × 140 × 25 mm), and the Biore u Foam Pump Former was used to foam the hard surface liquid detergent composition (undiluted) shown in Table 1 onto the SUS plates so that the dirt adhering to the plates was covered. The plates were then left to stand for two minutes. The plates were then rinsed with tap water for one minute at 300 rpm using a Lenauts tester, and then left to dry flat overnight. The mass of the SUS plate before the chloroform solution containing the modified oil was attached (initial mass), the mass of the SUS plate before cleaning (mass before cleaning), and the mass of the SUS plate after cleaning (mass after cleaning) were each weighed using a four-digit balance, and the cleaning rate (mass%) was calculated using the following formula (1). The evaluation of fast-acting modified oil cleaning ability was carried out using three SUS plates for each type of liquid detergent composition for hard surfaces, and the average cleaning rate of the three plates was calculated. The evaluation was carried out based on the calculated average cleaning rate according to the following evaluation criteria. The results are shown in Table 1. The higher the cleaning rate, the better the fast-acting modified oil cleaning ability of the detergent composition. A cleaning ability rating of "A" or "B" indicates high fast-acting modified oil cleaning ability, which is preferable. Cleaning rate (mass%) = [(mass before cleaning) - (mass after cleaning)] / [(mass before cleaning) - (initial mass)]] × 100 (1) <Evaluation criteria> A: The cleaning rate was 90% or more by mass, and the dirt was completely removed. B: The cleaning rate was 60% by mass or more and 89% by mass or less, and the dirt was removed. C: The cleaning rate was 41% by mass or more and 59% by mass or less, and the stain remained. D: The cleaning rate was 40% by mass or less, and most of the dirt remained.

[0054] (2) Cleaning ability against oily film stains The cleaning ability of each hard surface liquid detergent composition in Table 1 against film oil (baked-on oil) stains was evaluated by the following method. This evaluation was conducted to evaluate the cleaning ability against highly denatured oil stains that adhere to trivets, gas ranges, etc. (i) Pretreatment of SUS plate The surface of a SUS304 test piece (1.0 x 25 x 70 mm) manufactured by Engineering Test Service Co., Ltd. was polished with sandpaper #240, washed with a neutral dishwashing detergent, rinsed with deionized water, and dried. (ii) Preparation of modified oil Rapeseed oil (manufactured by Yamakei Sangyo Co., Ltd.) was applied to the surface of the SUS plate at a concentration of 1 mg / cm using a brush. 2 The oil was then baked in an oven set at 200°C for 2 hours to bake the film of oil onto the SUS plate. (iii) Evaluation of cleaning performance A 0.1 mL drop of each liquid detergent composition for hard surfaces listed in Table 1 was added to an oil film baked onto a SUS plate and allowed to stand for 2 minutes. The SUS plate was placed 7 cm from the faucet, and 20°C tap water was poured onto the drop of the liquid detergent composition for hard surfaces listed in Table 1 at a flow rate of 4 L / min for 10 seconds to rinse. After rinsing, the SUS plate was allowed to air dry, and the degree of soil removal was visually observed. The cleaning ability against oil film stains was evaluated according to the following evaluation criteria. Compositions rated "A," i.e., compositions that removed soiling by rinsing with water, were compositions with excellent cleaning power against oil film stains in their undiluted form. In particular, these compositions were excellent in cleaning oil film stains even after a short treatment period. Incidentally, cases in which the soiling was removed by wiping the SUS surface with Kimwipes® after rinsing were also rated "D." <Evaluation criteria> A: The oily film stains were removed by rinsing with water. D: The stains didn't come off.

[0055] (3) Evaluation of foam retention Each hard surface liquid cleaning composition in Table 1 was placed in a trigger-type spray container specifically designed for use with KPS Powerful Disinfectant Cleaners, and the trigger of the spray container was pulled once to dispense 1 mL of the hard surface liquid cleaning composition in foam form from the spray container, and the foam retention of the composition was evaluated. The foam retention evaluation was performed according to the following evaluation criteria. The results are shown in Table 1. The longer the foam is retained, the better the foam retention of the hard surface liquid cleaning composition. A foam retention rating of "A" or "B" is preferred, as the composition has good foam retention. <Evaluation criteria> A: The foam was maintained for 6 minutes or more after the composition was discharged. B: The foam disappeared within 4 minutes or more and less than 6 minutes after the composition was discharged. C: The bubbles disappeared within 2 minutes or more and less than 4 minutes after the composition was discharged. D: The foam disappeared within 2 minutes after the composition was discharged.

[0056] [Table 1]

Claims

1. A liquid cleaning composition for hard surfaces, comprising: (a) an amine oxide surfactant in an amount of 1% by mass or more and 10% by mass or less; (b) monoethanolamine in an amount of 8% by mass or more and 20% by mass or less; and (c) an alkali metal hydroxide and water, and having a pH of 12.0 or more at 25°C.

2. The liquid cleaning composition for hard surfaces according to claim 1, wherein an aqueous solution containing 1% by mass of the liquid cleaning composition for hard surfaces has a pH of 12 or higher at 25°C.

3. The liquid cleaning composition for hard surfaces according to claim 1 or 2, wherein the liquid cleaning composition for hard surfaces optionally contains (d) a water-soluble organic solvent [referred to as component (d)], and the content of component (d) in the composition is 5 mass% or less.

4. A method for cleaning a hard surface, comprising contacting the hard surface with a liquid detergent composition for hard surfaces, the liquid detergent composition containing (a) 1% by mass or more and 10% by mass or less of an amine oxide surfactant, (b) 8% by mass or more and 20% by mass or less of monoethanolamine, and (c) an alkali metal hydroxide and water, and having a pH of 12.0 or more at 25°C.

5. The method for cleaning a hard surface according to claim 4, wherein an aqueous solution containing 1% by mass of the liquid detergent composition for hard surfaces has a pH of 12 or higher at 25°C.

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