Liquid cleaning agent composition

Abstract

To provide a liquid cleaning agent composition that exhibits high cleaning performance against firm oily contamination such as hardened oil, becomes a homogeneous transparent solution even at high concentration, has low viscosity and allows easy dilution, and can be used either as an undiluted solution or after dilution according to a level of contamination and a cleaning target.SOLUTION: A liquid cleaning agent composition contains (A) a nonionic surfactant (hereinafter referred to as an (A) component), (B) an anionic surfactant (hereinafter referred to as a (B) component), (C) a sulfonate-type hydrotrope agent (hereinafter referred to as a (C) component), (D) a water-soluble glycol-type solvent (hereinafter referred to as a (D) component), (E) an inorganic alkaline agent (hereinafter referred to as an (E) component), and water, wherein the (A) component is 5 to 20 mass%, the (E) component is 1 to 6 mass%, and a content of the water is 32 to 60 mass%.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to a liquid detergent composition that can effectively remove oily stains. Specifically, the present invention relates to a liquid detergent composition that has excellent storage stability even when highly concentrated, and that can effectively remove oily stains by appropriately diluting it depending on the material to be used and the level of oily stains. [Background technology]

[0002] In recent years, active efforts have been made to conserve energy and resources, and efforts are being made to increase the concentration of detergents in order to reduce transportation costs, container costs, etc. Many detergents contain surfactants and builders, which are the main factors in their cleaning performance, and the higher the concentration of these, the less they can be used per use.

[0003] Incidentally, as a cleaning composition used for cleaning hard surfaces such as tableware, cooking utensils, and kitchen walls and floors, Patent Document 1, for example, discloses a cleaning composition consisting of a uniform, transparent solution in which a water-insoluble nonionic surfactant, a water-soluble nonionic surfactant, and an anionic hydrotrope are dissolved in water. However, this cleaning composition does not contain an inorganic alkaline agent such as sodium hydroxide, and the pH of the composition is weakly alkaline to weakly acidic (for example, pH 3.0 to 11.0), so it has a problem in terms of detergency against stubborn oily stains formed by hardened adhered oil.

[0004] Patent Document 2 discloses a cleaning composition with improved detergency against stubborn oily stains, which has a pH of 12 or higher and is composed of a linear alkylbenzene sulfonate, a strong basic compound such as sodium hydroxide, and a water-soluble glycol solvent dissolved in water. The cleaning composition aims to effectively remove oily stains by improving adhesion stability when sprayed onto oily stains on vertical, inclined, or curved surfaces, thereby preventing the cleaning composition from dripping. To achieve this, the cleaning composition is imparted with thixotropy so that it has a high viscosity when left standing or under low shear stress, but a low viscosity under high shear stress when sprayed. However, despite containing 70 to 81% by mass of water, the cleaning composition disclosed in the examples has a viscosity (B-type viscometer, 25°C) of 1000 to 3000 mPa·s under low shear stress (6 rpm) and 200 to 900 mPa·s under high shear stress (60 rpm), making it a very viscous composition.

[0005] When increasing the concentration of a cleaning composition, the higher the concentration of the active ingredients of the cleaning composition, such as surfactants, alkalis, chelating agents, and solvents, the more the weight of the active ingredients that can be packed into a container of the same volume. This not only increases the weight of the active ingredients that can be packed into a container of the same volume, but also reduces transportation costs because more active ingredients can be transported with the same load. However, when the active cleaning ingredients are incorporated at high concentrations, if the balance of the system is not appropriate, problems such as cloudiness or precipitation occurring, making it impossible to produce a uniform and stable cleaning agent or to achieve the desired cleaning effect, and the viscosity of the cleaning composition increases due to the high concentration, making it difficult to handle. Furthermore, problems such as the need for heating or strong stirring when diluted for use, or the viscosity remaining too high even after dilution to spray with a trigger sprayer may occur.

[0006] Patent Document 3 discloses a concentrated liquid detergent composition containing 40-60% by mass of a nonionic surfactant excluding fatty acid alkanolamides, 0.4-20% by mass of a fatty acid alkanolamide, 5-20% by mass of a water-soluble solvent, and 0.5-2% by mass of a saturated fatty acid, with a water content of 11.0-44.5% by mass in the examples. This detergent composition has a viscosity of 50-300 mPa·s (B-type viscometer, 60 rpm, 20°C) and is a highly concentrated, low-viscosity detergent composition. However, as indicated by its pH of 6-8, it does not contain inorganic alkalis such as sodium hydroxide, leaving it with limited detergency against stubborn oily stains such as hardened oil. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] Patent Publication No. 2021-075648 [Patent Document 2] Japanese Patent Application Laid-Open No. 2008-024831 [Patent Document 3] Japanese Patent Application Publication No. 2020-139126 DISCLOSURE OF THE INVENTION [Problem to be solved by the invention]

[0008] The present invention is stable even at high concentrations and has a high detergency against stubborn oil stains such as hardened oil. The present invention addresses the problem of providing a liquid detergent composition having a low viscosity, which is easy to handle and can be used in the form of an undiluted solution or diluted depending on the degree of soiling and the object to be cleaned. [Means for solving the problem]

[0009] The present invention relates to a composition comprising (A) a nonionic surfactant (hereinafter referred to as component (A)), (B) an anionic surfactant (hereinafter referred to as component (B)), (C) a sulfonate-type hydrotropic agent (hereinafter referred to as component (C)), (D) a water-soluble glycol-type solvent (hereinafter referred to as component (D)), (E) an inorganic alkaline agent (hereinafter referred to as component (E)), and water, The liquid detergent composition contains 5 to 20% by mass of component (A), 1 to 6% by mass of component (E), and 32 to 60% by mass of water. [Effects of the Invention]

[0010] According to the present invention, a liquid detergent composition is provided that has high detergency on hard surfaces and exhibits a high cleaning effect on stubborn oil stains such as oil stains that have hardened over time or due to heat, as well as grease. Furthermore, the liquid detergent composition of the present invention is highly concentrated yet has low viscosity and uniform transparency, and can be used as is or diluted depending on the level of soiling and the material and shape of the items to be washed. Furthermore, because it is highly concentrated, it can contribute to resource savings, such as the cost of container materials and transportation energy. BEST MODE FOR CARRYING OUT THE INVENTION

[0011] The liquid detergent composition of the present invention is a composition containing (A) a nonionic surfactant (hereinafter referred to as component (A)), (B) an anionic surfactant (hereinafter referred to as component (B)), (C) a sulfonate-type hydrotrope agent (hereinafter referred to as component (C)), (D) a water-soluble glycol-type solvent (hereinafter referred to as component (D)), (E) an inorganic alkaline agent (hereinafter referred to as component (E)), and water, The content of component (A) is 5 to 20 mass %, the content of component (E) is 1 to 6 mass %, and the content of water is 32 to 60 mass %.

[0012] The liquid detergent composition of the present invention has low viscosity even at high concentrations and exhibits excellent detergency against oily stains. While the details of why this is the case are unclear, we speculate that a nonionic surfactant content of 5% by mass or more can exhibit high detergency against stubborn oily stains such as hardened oils. A nonionic surfactant content of 20% by mass or less can suppress cloudiness due to insolubilization of the nonionic surfactant and an increase in viscosity of the liquid detergent composition while ensuring the inorganic alkaline agent content. Viscosity increase can be suppressed even when the water content in the composition is 60% by mass or less. Furthermore, by including a sulfonate-type hydrotropic agent and a water-soluble glycol-type solvent, a uniform and transparent solution can be maintained without causing cloudiness or precipitation due to precipitation of inorganic alkaline agents caused by high concentrations or insolubilization of nonionic surfactants.

[0013] <Component (A)> The component (A) of the liquid detergent composition of the present invention is a nonionic surfactant. The nonionic surfactant may be a single type or a combination of two or more types. The nonionic surfactant used is one that can prepare a uniform, transparent liquid detergent composition when the water content in the liquid detergent composition is 32 to 60 mass % and that is as stable as possible (does not become cloudy) even in the presence of an inorganic alkaline agent.

[0014] Preferred examples of the nonionic surfactant include nonionic surfactants having two water-soluble functional groups at the molecular end. Examples include nonionic surfactants represented by general formula (1) and general formula (2). These nonionic surfactants are also preferred from the viewpoint of suppressing an increase in viscosity of the liquid detergent composition. The reason for this is presumed to be as follows: Generally, an aqueous solution of an anionic surfactant in water tends to thicken as the concentration of the anionic surfactant increases. However, when the liquid detergent composition contains the nonionic surfactant represented by general formula (1) and / or general formula (2), the interaction between the nonionic surfactant and other surfactants changes the micellar structure of the surfactant, thereby suppressing the increase in viscosity of the detergent composition.

[0015] Preferred nonionic surfactants in the present invention include those represented by general formula (1).

[0016] [ka] (In the formula, R 1 is an alkyl or alkenyl group having 8 to 22 carbon atoms.

[0017] In the above general formula (1), R 1 R represents an alkyl group or an alkenyl group having 8 to 22 carbon atoms, more preferably an alkyl group. 1 From the viewpoint of achieving high concentration and low viscosity of the liquid detergent composition, is preferably an alkyl or alkenyl group having 10 to 20 carbon atoms, and more preferably an alkyl group having 10 to 18 carbon atoms.

[0018] Specific preferred examples include coconut fatty acid diethanolamide, palm kernel oil fatty acid diethanolamide, lauric acid diethanolamide, palmitic acid diethanolamide, myristic acid diethanolamide, and the like. Among these, coconut fatty acid diethanolamide and palm kernel oil fatty acid diethanolamide are preferred from the viewpoints of oil cured film removal ability and economy.

[0019] Moreover, preferred nonionic surfactants include those represented by general formula (2).

[0020] [ka] (In the formula, R 2 is an alkyl or alkenyl group having 8 to 22 carbon atoms, AO is ethylene oxide or a mixture of ethylene oxide and propylene oxide, m and n are integers of 1 or more, and the sum of m and n is 1 to 100.

[0021] In the above general formula (2), R 2R represents an alkyl group or an alkenyl group having 8 to 22 carbon atoms, more preferably an alkyl group. 2 From the viewpoint of achieving high concentration and low viscosity in the liquid detergent composition, is preferably an alkyl or alkenyl group having 10 to 20 carbon atoms, more preferably an alkyl or alkenyl group having 10 to 18 carbon atoms, even more preferably an alkyl or alkenyl group having 12 to 18 carbon atoms, and particularly preferably an alkyl or alkenyl group having 10 to 16 carbon atoms. It may also be one having a mixed alkyl (or alkenyl) group derived from a vegetable oil selected from coconut oil and palm kernel oil.

[0022] AO represents ethylene oxide or a mixture of ethylene oxide and propylene oxide. A mixture of ethylene oxide and propylene oxide is preferred because it allows for a low-foaming, low-viscosity detergent composition to be obtained. Ethylene oxide and propylene oxide may be either a block adduct or a random adduct. m and n are integers of 1 or greater, and the sum of m and n is 1 to 100, preferably 3 to 60, and more preferably 5 to 40.

[0023] Specific examples of the aliphatic amine alkylene oxide adduct of general formula (2) include a PO / EO block adduct of n-decylamine, an EO·PO random adduct of n-decylamine, a PO / EO block adduct of n-dodecylamine, an EO·PO random adduct of n-dodecylamine, etc. Two or more of these may be used in combination.

[0024] The compound represented by general formula (2) can be a commercially available product, such as the Puremeal series (manufactured by Sanyo Chemical Industries, Ltd.), the Amito series (manufactured by Kao Corporation), the Liponol series (manufactured by Lion Specialty Chemicals Co., Ltd.), and the Brownon series (manufactured by Aoki Oil & Fat Industries Co., Ltd.).

[0025] The inclusion of component (A) not only prevents the viscosity increase that occurs when the detergent composition is made highly concentrated, but also enhances the oil solubilization ability, resulting in a liquid detergent composition with high detergency against oily stains. It is desirable to select the nonionic surfactant (A) from those that do not cause cloudiness or precipitation when mixed with the inorganic alkali agent (E) in the ratio specified in claim 1.

[0026] The content of component (A) in the liquid detergent composition of the present invention is 5% by mass or more, preferably 7% by mass or more, and more preferably 10% by mass or more, from the viewpoint of exhibiting high detergency against dirt such as dust and sebum, as well as against stubborn oily dirt such as hardened oil. Furthermore, from the viewpoint of preventing an increase in the viscosity of the body cleanser composition and achieving a low viscosity, the content is 20% by mass or less, preferably 18% by mass or less, and more preferably 15% by mass or less. When the content of component (A) is 5% by mass or more, the liquid detergent composition can be a highly concentrated detergent composition, ensuring cleaning performance and reducing viscosity even when the water content in the detergent composition is 60% by mass or less. Furthermore, when the content of component (A) is 20% by mass or less, the contents of other components, such as component (B) (anionic surfactant) and component (E) (inorganic alkali agent), are not significantly reduced, allowing the detergent composition to exhibit high detergency.

[0027] Component (A) may consist solely of one or more nonionic surfactants represented by general formula (1) or general formula (2), or may contain other nonionic surfactants in combination with the nonionic surfactants. The nonionic surfactant used in combination is not particularly limited, but examples thereof include polyoxyalkylene alkyl ethers in which an average of 1 to 12 moles of ethylene oxide are added to an alcohol having 10 to 18 carbon atoms, and polyoxyalkylene alkyl ethers in which an average of 1 to 12 moles of ethylene oxide and propylene oxide are added to an alcohol having 10 to 18 carbon atoms. Examples of the alcohols include primary alcohols, secondary alcohols, and branched alcohols. Other examples include polyoxyalkylene fatty acid sorbitan esters and polyoxyalkylene hydrogenated castor oil. Among these, polyoxyalkylene alkyl ethers are preferred in terms of alkali resistance and detergency. From the viewpoints of hardened grease removal ability and penetration ability of the liquid detergent composition, the other nonionic surfactant is preferably contained in an amount of 2% by mass or more, more preferably 4% by mass or more, and from the viewpoints of high concentration and low viscosity, the other nonionic surfactant is preferably contained in an amount of 10% by mass or less, more preferably 8% by mass or less. From the viewpoint of reducing the viscosity of the detergent composition, it is preferable to contain the other nonionic surfactant in a smaller amount than the nonionic surfactants represented by general formula (1) and general formula (2).

[0028] <(B) component> The component (B) of the liquid detergent composition of the present invention is an anionic surfactant. The anionic surfactant (B) is added to enhance the detergency against dust, sebum, uncured oily stains, etc. The anionic surfactants may be used alone or in combination of two or more.

[0029] Examples of anionic surfactants include alkyl sulfates, alkyl ether sulfates, linear or branched alkylbenzene sulfonates, alkyl sulfonates, α-olefin sulfonates, alkyl ether sulfonates, α-methyl ester sulfonates, α-sulfofatty acid ester salts, alkyl ether sulfates, glycerin ether sulfates, monoglyceride sulfates, fatty acid amide sulfates, monoalkyl sulfosuccinates, dialkyl sulfosuccinates, monoalkyl sulfosuccinamidates, dialkyl sulfosuccinamidates, sulfotriglycerides, amide ether carboxylates, fatty acid isethionates, fatty acid sarcosinates, fatty acid taurides, acyl lactylates, acyl tartrates, acyl glutamates, N-acyl amino acid salts such as acylaspartates, alkyl oligoglucoside sulfates, alkyl (ether) phosphates, and polyoxyalkylene alkyl ether sulfates. Among these anionic surfactants, linear alkylbenzene sulfonates, alkyl sulfonates, and polyoxyalkylene alkyl ether sulfates are preferred from the standpoint of liquid stability of the liquid detergent composition and economic efficiency, with alkylbenzene sulfonates being particularly preferred. Alkylbenzene sulfonates are alkali metal salts such as sodium and potassium, Examples include alkanolamine salts and alkaline earth metal salts such as magnesium and calcium salts, but from the viewpoint of cleaning properties and storage stability of the composition, alkali metal salts or alkanolamine salts are preferred.

[0030] The content of component (B) in the liquid detergent composition of the present invention is preferably 8% by mass or more, more preferably 9% by mass or more, and even more preferably 10% by mass or more from the viewpoint of improving detergency, and is 35% by mass or less, more preferably 32% by mass or less, and even more preferably 30% by mass or less from the viewpoint of avoiding an increase in viscosity of the liquid detergent composition.

[0031] <(C) component> The component (C) of the liquid detergent composition of the present invention is a sulfonic acid hydrotrope. Sulfonate-type hydrotropes are preferred because they are highly effective in making the cleaning solution uniform and transparent, and may be used alone or in combination with a different type of hydrotrope. The incorporation of a sulfonic acid-type hydrotrope in the liquid detergent composition of the present invention can suppress the insolubilization of nonionic surfactants, inorganic alkali agents, etc., which occurs with high concentration.

[0032] Examples of sulfonate-type hydrotropes include toluenesulfonate, xylenesulfonate, cumenesulfonate, and naphthalenesulfonate, with xylenesulfonate and cumenesulfonate being particularly preferred. The salt form is preferably a sodium or potassium salt, with sodium salt being particularly preferred. The sulfonate-type hydrotropes may be used alone or in combination of two or more.

[0033] Examples of hydrotropes other than sulfonic acid hydrotropes include hydroxy ether hydrotropes such as butoxyethanol, butoxydiglycol, phenoxyethanol, and phenoxydiglycol.

[0034] The content of component (C) in the liquid detergent composition of the present invention is preferably 0.1 to 5 mass %, more preferably 0.4 to 4 mass %, and even more preferably 1.5 to 3.5 mass %. The sulfonate hydrotrope, when combined with component (D) (a water-soluble glycol solvent described below), prevents the solution from becoming cloudy or precipitation occurs due to the insolubilization of nonionic surfactants or inorganic alkaline agents that occurs with high concentration, and can maintain the detergent composition in a uniform and transparent state.

[0035] <(D) component> Component (D) of the liquid detergent composition of the present invention is a water-soluble glycol solvent. Component (D) reduces the viscosity of the liquid detergent composition and prevents the insolubilization of nonionic surfactants, inorganic alkali agents, etc., which occurs when the liquid detergent composition is highly concentrated. Furthermore, when component (D) is used in combination with components (A) to (C), it has the effect of removing hardened oil films.

[0036] As the water-soluble glycol-type solvent, known compounds such as monoalkyl ether compounds or dialkyl ether compounds of polyhydric alcohols such as ethylene glycol, diethylene glycol, and triethylene glycol can be used. Examples include ethylene glycol monoalkyl ether, diethylene glycol monoalkyl ether, triethylene glycol monoalkyl ether, benzyl glycol, benzyl diglycol, phenyl glycol, propylene glycol monoalkyl ether, dipropylene glycol monoalkyl ether, etc. Among these, diethylene glycol monomethyl ether, diethylene glycol monoethyl ether, diethylene glycol monobutyl ether, diethylene glycol dimethyl ether, diethylene glycol diethyl ether, diethylene glycol dibutyl ether, triethylene glycol dimethyl ether, and triethylene glycol diethyl ether are preferred. From the viewpoint of excellent oil and fat solubility, diethylene glycol monomethyl ether, diethylene glycol monoethyl ether, and diethylene glycol monobutyl ether are particularly preferred.

[0037] These glycol ethers may be used alone or in combination of two or more.

[0038] The content of component (D) in the liquid detergent composition of the present invention is preferably 5% by mass or more, more preferably 7% by mass or more, and even more preferably 10% by mass or more, from the viewpoint of removing hardened oils and fats and improving penetration, and is preferably 20% by mass or less, more preferably 17% by mass or less, and even more preferably 15% by mass or less, from the viewpoint of improving detergency (ensuring the surfactant content).

[0039] <(E) component> The component (E) of the liquid detergent composition of the present invention is an inorganic alkaline agent. This has the effect of enhancing the detergency of the liquid detergent composition of the present invention against stains such as sebum and protein, and stubborn oil stains such as hardened oil. The inorganic alkaline agents may be used alone or in combination of two or more.

[0040] As component (E), sodium hydroxide, potassium hydroxide, sodium carbonate, sodium silicate, etc. are used.

[0041] The content of component (E) in the liquid detergent composition of the present invention is preferably 1% by mass or more, more preferably 2% by mass or more, and even more preferably 3% by mass or more, from the viewpoint of ensuring detergency against oily stains, particularly against hardened oils and fats. Furthermore, from the viewpoint of liquid stability (suppressing precipitation of nonionic surfactants and inorganic alkaline agents), the content is preferably 6% by mass or less, more preferably 5% by mass or less, and even more preferably 4% by mass or less. To ensure the stability of the liquid detergent composition, the content of component (E) is preferably less than the content of component (A).

[0042] In addition to the components (A) to (E), the liquid detergent composition of the present invention may contain, as necessary, chelating agents, colorants, fragrances, preservatives, antibacterial agents, etc., within limits that do not impair the effects of the present invention.

[0043] As the chelating agent, a disodium salt of ethylenediaminetetraacetic acid, a tetrasodium salt of ethylenediaminetetraacetic acid, or the like can be used. The content of the chelating agent in the liquid detergent composition is 1 to 5 % by mass, preferably 1 to 3% by mass.

[0044] The liquid detergent composition of the present invention is prepared by dissolving components (A) to (E) and other components, if necessary, in water. The water content is 32 to 60% by mass. If the water content exceeds 60% by mass, the liquid detergent composition cannot be said to be highly concentrated. If the water content is less than 32% by mass, the liquid stability of the liquid detergent composition may decrease. If the water content is within the above range, the viscosity of the liquid detergent composition can be kept low. On the other hand, the higher the water content, the lower the viscosity of the detergent composition and the more uniform and transparent the solution will be. However, if the water content exceeds 60% by mass, this goes against resource and energy conservation.

[0045] The pH (liquid temperature: 25° C.) of the liquid detergent composition of the present invention is preferably 12 or higher, more preferably 13 or higher, from the viewpoint of detergency against oily stains.

[0046] The liquid detergent composition of the present invention preferably has a viscosity of 20 to 150 mPa·s, more preferably 20 to 120 mPa·s, as measured using a Brookfield viscometer (6 rpm, liquid temperature 25°C). The low viscosity of the liquid detergent composition makes it easy to handle, and there is no risk of thickening even when diluted with water of similar hardness to tap water. It also does not cause problems when sprayed with a trigger-type hand sprayer or the like. Even when used undiluted, the viscosity is not too high to make it difficult to handle, depending on the degree of dirt and the material and shape of the items to be washed.

[0047] The liquid detergent composition of the present invention can be widely used for cleaning tableware, cooking utensils, cooking appliances such as microwave ovens and ovens, walls and floors of kitchens and food preparation areas, fixtures and equipment in various factories, floors, etc. [Example]

[0048] EXAMPLES The present invention will be explained in more detail below using examples and comparative examples, but the present invention is not limited to the following examples.

[0049] The components used in the examples and comparative examples are as follows:

[0050] Component (A): Nonionic surfactant (a1) Aminone PK-02S (Kao Chemical Corporation, palm kernel oil fatty acid diethanolamide) (a2) Amizol CDE-G (Kawaken Fine Chemicals Co., Ltd., coconut fatty acid diethanolamide) (a3) Puremeal CS-60 (Sanyo Chemical Industries, Ltd., polyoxyalkylene alkylamine), cloud point (2% by mass aqueous solution) 73.5°C (a4) Sannonic SS-90 (Sanyo Chemical Industries, Ltd., polyoxyalkylene alkyl ether, C12-14 alcohol EO 8 mole adduct) (a5) Lionol NH1509 (Lion Specialty Chemicals Co., Ltd., polyoxyalkylene alkyl ether, EO / PO adduct of synthetic secondary alcohol)

[0051] (B) Component: Anionic surfactant (b1) Teika Power L121 (Teika Corporation, alkylbenzene sulfonic acid) was neutralized with NaOH and used. (b2) Sannol LM1130 (Lion Specialty Chemicals Co., Ltd., sodium alkylsulfonate) (b3) Sannol LMT1430 (Lion Specialty Chemicals Co., Ltd., polyoxyethylene (2 mol) lauryl ether sulfate) (b4) Silinone SPE-1250 (New Japan Chemical Co., Ltd., polyoxyethylene (3 mol) lauryl ether sulfate)

[0052] (C) Component: Sulfonate-type hydrotropic agent (c1) Teikatox N1140 (Teika Corporation, sodium xylene sulfonate) (c2) SXS-Y (ITOCHU Chemical Frontier Corporation, sodium meta-xylene sulfonate) (c3) Teikatox N5040 (Teika Corporation, sodium cumene sulfonate)

[0053] (D) Component: Water-soluble glycol solvent (d1) Diethylene glycol monoethyl ether (Fujifilm Wako Pure Chemical Industries, Ltd.) (d2) Diethylene glycol monobutyl ether (Fujifilm Wako Pure Chemical Industries, Ltd.)

[0054] (E) Ingredient: inorganic alkaline agent (e1) 48% NaOH aqueous solution (AGC Inc.) (e2) 48% KOH aqueous solution (AGC Corporation)

[0055] (F) Ingredient: Chelating agent (f1) Dissolvin Na2 (Nouryon Japan Co., Ltd., EDTA disodium) (f2) Dissolvin Na (Nouryon Japan Co., Ltd., EDTA tetrasodium)

[0056] (Examples 1 to 9, Comparative Examples 1 to 4) The components shown in Tables 1 and 2 were mixed in the proportions (mass %) shown in the tables, and the mixture was stirred at room temperature for approximately 30 minutes using a multiple hot stirrer REXIM RSH-4DN (As One Corporation) to prepare a liquid detergent composition. The properties of the obtained liquid detergent composition were evaluated by determining its stability at room temperature, and measuring its pH and viscosity.

[0057] [Stability at room temperature] The room temperature stability was evaluated by visually checking the uniformity and transparency of the liquid after leaving it to stand for 24 hours in a room temperature (23°C) atmosphere, and judging it according to the following criteria. ○: A transparent and uniform solution ×: Cloudiness is observed For compositions judged to have room temperature stability of ◯, the pH and viscosity properties were measured, and the hardened oil removal test, penetration test, and cleaning test described below were carried out to evaluate performance.

[0058] [Viscosity measurement] Each liquid detergent composition of Examples 1 to 9 and Comparative Examples 1 to 4 was kept at a constant temperature of 23°C, and then measured for 1 minute at 23°C using a small sample adapter on a B-type viscometer TVB10 (manufactured by Toki Sangyo Co., Ltd.) with a rotor with a spindle THM-11 at rotation speeds of 6 rpm and 60 rpm. The measured viscosities (mPa s) are shown in Tables 1 and 2.

[0059] [Hardened oil and fat removal evaluation test] A thin layer of salad oil was applied to a SUS plate, which was then heated in a preheated oven at 200°C for 15 minutes to harden the oil, and then allowed to cool to room temperature to form a cured salad oil film on the SUS plate. Separately, a cleaning solution (10% diluted solution) was prepared by diluting the liquid cleaning composition 10 times with tap water, and a cleaning solution (1% diluted solution) was prepared by diluting it 100 times. 30 μl of each of the original, 10% diluted, and 1% diluted liquids of the liquid cleaning composition was weighed out with a micropipette and dropped onto the cured film. After 5 minutes, the surface was wiped with a paper rag, and the state of the cured film was observed and evaluated according to the following criteria. ◎: All hardened film was removed from the applied area ○: Part of the cured film was removed from the applied area △: It was confirmed that the cleaning agent had penetrated into the hardened film where it was applied. ×: No change was observed in the cured film at the applied area.

[0060] [Permeability evaluation test] 50 g of the 1% diluted solution used in the hardened oil removal test was weighed into a 100 ml beaker, and a piece of unrefined cotton cloth cut into a 2 cm square was gently placed on top, and the time it took for the cloth to sink to the bottom of the beaker was measured. The test was carried out twice, and the average value was evaluated according to the following criteria. ◎: Less than 20 seconds ○: 20 seconds or more but less than 30 seconds △: 30 seconds or more but less than 40 seconds ×: 40 seconds or more

[0061] [Cleaning evaluation test] Molybdenum grease, iron powder, and carbon black were uniformly mixed in an 80 / 10 / 10 (mass ratio) ratio to prepare an industrial oil simulant. Approximately 0.2 g of the simulant oil was applied to a 30-mesh stainless steel mesh (5 cm long x 2 cm wide) to create a dirt plate. The weight of the stainless steel mesh was precisely weighed before and after the dirt application. A cleaning solution (30 g) prepared by diluting the liquid detergent composition with tap water to 30% was placed in a 50 ml glass bottle and left in a thermostatic bath at 40°C for 2 hours. After that, a test piece was placed in the bottle and subjected to ultrasonic cleaning at 40°C for 10 minutes in an ultrasonic cleaner MCS-2 (AS ONE Corporation). The test piece was then rinsed with tap water and dried at 120°C for 2 hours, after which the test piece was weighed. The weight of the dirt removed was calculated from the weight of the test piece before and after cleaning, and the cleaning rate was calculated and evaluated according to the following criteria. Cleaning rate (%) = (weight of cleaned test plate - weight of stainless steel mesh) / (weight of test plate before cleaning - weight of stainless steel mesh) * 100 ◎: Cleaning rate 70% or more ○: Cleaning rate is 40% or more but less than 70% △: Cleaning rate is 30% or more but less than 40% ×: Cleaning rate less than 30%

[0062] The properties and performance evaluation results of each liquid detergent composition are shown in Tables 1 and 2.

[0063] The results in Tables 1 and 2 show that the liquid detergent composition of the present invention (a liquid detergent composition containing a nonionic surfactant containing a fatty acid diethanolamide or a polyoxyalkylene alkylamine, an anionic surfactant, a sulfonate-type hydrotrope agent, a water-soluble glycol-type solvent, and an inorganic alkaline agent) has excellent stability at room temperature, low viscosity, and is excellent at removing hardened oils and fats, as well as exhibiting high detergency against oily stains such as those produced by industrial imitation oils.

[0064] In contrast, a liquid detergent composition containing fatty acid diethanolamide or polyoxyalkylene alkylamine as a nonionic surfactant but not containing a sulfonate-type hydrotrope (Comparative Example 1), and a liquid detergent composition containing fatty acid diethanolamide or polyoxyalkylene alkylamine as a nonionic surfactant but not containing a water-soluble glycol-type solvent (Comparative Example 4) are found to lack stability at room temperature.

[0065] It is also found that the cleaning composition containing no anionic surfactant (Comparative Example 2) is inferior in the penetration evaluation and the cleaning performance evaluation using simulated industrial oil, and the cleaning composition containing no inorganic alkaline agent (Comparative Example 3) is inferior in the evaluation of hardened grease removal and cleaning performance.

[0066] [Table 1]

[0067] [Table 2] [Industrial Applicability]

[0068] The liquid detergent composition of the present invention has high detergency and excellent cleaning properties even for stubborn oil stains such as hardened oil, machine oil, and grease. Because of its low viscosity, it can be used undiluted or diluted. Therefore, it can be widely used for both household and industrial purposes. In particular, it is suitable for cleaning walls and floors, cooking utensils, cooking equipment, and tableware in kitchens and commercial kitchens; walls and floors, fixtures, equipment, etc. in metal processing factories, repair shops, and other factories that handle industrial lubricants such as molybdenum grease, silicone grease, cutting oil, and engine oil; and hard surfaces.

Claims

1. A cleaning composition comprising (A) a nonionic surfactant (hereinafter referred to as component (A)), (B) an anionic surfactant (hereinafter referred to as component (B)), (C) a sulfonate-type hydrotrope agent (hereinafter referred to as component (C)), (D) a water-soluble glycol-type solvent (hereinafter referred to as component (D)), (E) an inorganic alkaline agent (hereinafter referred to as component (E)), and water, A liquid detergent composition comprising 5 to 20% by mass of component (A), 1 to 6% by mass of component (E), and 32 to 60% by mass of water.

2. The component (A) is A nonionic surfactant represented by general formula (1) 【Chemistry 1】 (In the formula, R １ is an alkyl or alkenyl group having 8 to 22 carbon atoms. and / or A nonionic surfactant represented by general formula (2) 【Chemistry 2】 (In the formula, R ２ is an alkyl or alkenyl group having 8 to 22 carbon atoms, AO is ethylene oxide or a mixture of ethylene oxide and propylene oxide, m and n are integers of 1 or more, and the sum of m and n is 1 to 100. The liquid detergent composition of claim 1, comprising:

3. 2. The liquid detergent composition according to claim 1, wherein component (B) contains a linear alkylbenzene sulfonate.

4. The liquid detergent composition according to claim 1, wherein the content of component (B) is 8 to 30 mass%.

5. The liquid detergent composition according to claim 1, wherein the content of component (A) is 10 to 20 mass%.

6. 6. The liquid detergent composition according to claim 1, wherein the viscosity of the composition at 25°C is 20 mPa·s to 150 mPa·s.

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