Liquid cleaner composition and cleaning method

Abstract

To provide a liquid cleaner composition with superior storage stability at both low and high temperatures, and a cleaning method using the liquid cleaner composition.SOLUTION: A liquid cleaner composition comprises an alkali metal salt of hypochlorous acid (A), a betaine represented by the general formula (1) (B), and a hydroxide of alkali metal (C), and satisfies at least one selected from the following condition 1, condition 2 and condition 3. Condition 1: (total weight of betaines with R1 having 12-14 carbons) / (total weight of betaines with R1 having 12-16 carbons)=0.2 to 0.8. Condition 2: (total weight of betaines with R1 having 10-12 carbons) / (total weight of betaines with R1 having 14-22 carbons)=1.01 to 1.80. Condition 3: a foam adhesion test shows a foam movement distance of 73 mm or less.SELECTED DRAWING: None

Description

[Technical field]

[0001] The present invention relates to a liquid detergent composition having excellent storage stability at low and high temperatures, and a cleaning method using the liquid detergent composition. [Background technology]

[0002] Cleaning agents used in food processing plants are very important to ensure food safety and quality. In food processing plants, machines, equipment, containers, pipelines, etc. used in various processes need to be cleaned, and these surfaces and equipment may be contaminated with food residues, grease, microorganisms, foreign objects, etc. Therefore, by using appropriate cleaning agents, these dirt and microorganisms can be removed, making it possible to ensure food safety. For this reason, cleaning agents for food processing plants need to contain ingredients such as oxidizing agents with antibacterial properties in addition to surfactants. Furthermore, cleaning agents are required to have foaming properties. By having foaming properties, a cleaning agent can adhere to the surface being cleaned for a long time, which enhances its cleaning properties and antibacterial properties. In addition, conventional cleaning agents often had poor foam-breaking properties. If quick foam-breaking properties could be achieved, it would be possible to reduce the environmental impact of large amounts of wastewater and improve working conditions by shortening cleaning times. For these reasons, zwitterionic surfactants have been used as active ingredients in cleaning agents for food processing factories. However, some amine oxide surfactants have been designated as substances subject to the PRTR system due to concerns about their harmfulness to humans and ecosystems, as they are recognized to exist widely and continuously in the environment.

[0003] Patent Document 1 proposes that the combined use of lauryl dimethylamine oxide and an alkali metal hypochlorite provides an excellent bleaching and cleaning effect against mold. However, there is concern that lauryl dimethylamine oxide has poor foaming properties and therefore poor cleaning power.

[0004] Furthermore, Patent Document 2 proposes a cleaning agent containing an amidopropyl betaine surfactant or an imidazolium surfactant. However, there is a concern that amidopropyl betaine surfactants and imidazolium surfactants may react with alkali metal hypochlorite under basic conditions and decompose, and therefore, foaming properties may not be obtained with a cleaning agent containing an alkali metal hypochlorite. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2016-69566 A [Patent Document 2] Patent Publication No. 2021-98826 DISCLOSURE OF THEINVENTION [Problem to be solved by the invention]

[0006] Previous liquid detergents containing zwitterionic surfactants could experience precipitation or sedimentation of the detergent ingredients, especially when stored in cold regions or when exposed to low temperatures of -5°C or below or high temperatures of 50°C or above for long periods of time during distribution and storage. There was a need for the development of a liquid detergent composition that would be stable even when stored for long periods at both low and high temperatures. Therefore, an object of the present invention is to provide a liquid detergent composition having excellent storage stability at both low and high temperatures, and a cleaning method using the liquid detergent composition. [Means for solving the problem]

[0007] As a result of extensive research, the inventors have found that a liquid detergent composition that contains an alkali metal hypochlorite (A), a betaine (B) and an alkali metal hydroxide (C) and satisfies certain conditions has excellent stability even when stored for long periods at low and high temperatures.

[0008] That is, the liquid detergent composition of the present invention has the following properties: <1> ~ <11> The present invention includes the above embodiment. <1> A liquid detergent composition comprising an alkali metal hypochlorite (A), a betaine (B) represented by the following general formula (1), and an alkali metal hydroxide (C), and satisfying at least one of the following conditions 1, 2, and 3: [ka] (R in formula (1) 1 is an alkyl or alkenyl group having 10 to 22 carbon atoms. Condition 1: (The above R 1 (Total weight of betaines having 12 to 14 carbon atoms) / ( 1 (Total weight of betaines with carbon numbers of 12 to 16) = 0.2 to 0.8 Condition 2: (The above R 1 (Total weight of betaines having 10 to 12 carbon atoms) / ( 1 (total weight of betaines with carbon numbers of 14 to 22) = 1.01 to 1.80 Condition 3: The bubble travel distance in the bubble adhesion test is 73 mm or less <2> The content of the betaine (B) is 0.5 to 20% by weight. <1> The liquid cleaning composition according to claim 1. <3> The content of the alkali metal hypochlorite (A) is 0.5 to 10% by weight. <1> or <2> The liquid cleaning composition according to claim 1. <4> The condition 1 is (the R 1 (Total weight of betaines having 12 to 14 carbon atoms) / ( 1 (total weight of betaines having 12 to 16 carbon atoms) = 0.4 to 0.7, <1> ~ <3> 2. The liquid detergent composition according to claim 1 . <5> The condition 2 is (the R 1 (Total weight of betaines having 10 to 12 carbon atoms) / ( 1 (total weight of betaines having 14 to 22 carbon atoms) = 1.20 to 1.60, <1> ~ <4> 2. The liquid detergent composition according to claim 1 . <6> The betaine (B) contains at least three types of betaine; <1> ~ <5> 2. The liquid detergent composition according to claim 1 . <7> further comprising an anionic surfactant (D), and a weight ratio (B / D) of the betaine (B) to the anionic surfactant (D) is 1 to 50; <1> ~ <6> 2. The liquid detergent composition according to claim 1 . <8> The anionic surfactant (D) includes at least one selected from a sulfonic acid type anionic surfactant (D1) and a carboxylic acid type anionic surfactant (D2). <7> The liquid cleaning composition according to claim 1. <9> Does not become cloudy at -5℃ <1> ~ <8> 2. The liquid detergent composition according to claim 1 . <10> No precipitate formed at 50℃ <1> ~ <9> 2. The liquid detergent composition according to claim 1 . <11> <1> ~ <10> 2. A cleaning method comprising the steps of applying to an object to be cleaned at least one selected from the liquid cleaning composition described in any one of claims 1 to 10 and a dilution thereof, and then removing the same. Effect of the Invention

[0009] The liquid detergent composition of the present invention has excellent stability even when stored for long periods at low and high temperatures. The cleaning method of the present invention is excellent in work efficiency since it uses a liquid detergent composition which is stable even when stored for a long period of time at low and high temperatures. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Hereinafter, each component of the liquid detergent composition (hereinafter, sometimes simply referred to as the detergent composition) will be described. [Alkaline metal hypochlorite (A)] The cleaning composition of the present invention contains an alkali metal hypochlorite (A). Examples of the alkali metal hypochlorite (A) include sodium hypochlorite, potassium hypochlorite, lithium hypochlorite, etc., and from the viewpoint of availability, sodium hypochlorite and potassium hypochlorite are preferred. The proportion of the alkali metal hypochlorite (A) in the cleaning composition of the present invention is preferably 0.5 to 10% by weight in terms of foaming property. The upper limit of the proportion is more preferably 8% by weight, further preferably 5% by weight, particularly preferably 3% by weight, and most preferably 2% by weight. On the other hand, the lower limit of the proportion is more preferably 0.8% by weight, further preferably 1% by weight, particularly preferably 1.2% by weight, and most preferably 1.5% by weight. Also, for example, 0.8 to 8% by weight is more preferable, and 1.2 to 3% by weight is even more preferable.

[0011] [Betaine (B) represented by general formula (1)] The detergent composition of the present invention contains a betaine (B) represented by general formula (1) (hereinafter, may be simply referred to as betaine (B)). Betaine (B) is a betaine type surfactant represented by the following general formula (1).

[0012] [ka]

[0013] Here, R 1 is an alkyl or alkenyl group having 10 to 22 carbon atoms. Betaine (B) is excellent in storage stability at low and high temperatures, and is 1 It is preferable that the betaine has 14 to 22 carbon atoms, it is more preferable that the betaine has 14 to 18 carbon atoms, and it is even more preferable that the betaine has 14 carbon atoms. R 1 is preferably an alkyl group in terms of cleaning properties. R 1 R may be a straight chain or a branched chain, but is preferably a straight chain in terms of foaming properties. 1 is preferably at least three kinds of alkyl or alkenyl groups.

[0014] Betaine (B) is (R 1 (Total weight of betaines with carbon numbers of 12 to 14) / (R 1 (R )=0.2 to 0.8 (Condition 1) and / or (R 1 (Total weight of betaines with carbon numbers of 10 to 12) / (R 1 It is preferable in terms of low-temperature stability to satisfy the condition (Condition 2) of (a) to (c) (total weight of betaines having 14 to 22 carbon atoms)=1.01 to 1.80.

[0015] Regarding condition 1, (R 1 (Total weight of betaines with carbon numbers of 12 to 14) / (R 1 From the viewpoint of excellent foaming properties, (R 1 (Total weight of betaines with carbon numbers of 12 to 14) / (R 1 The total weight of betaines having 12 to 16 carbon atoms is preferably 0.8 or less, more preferably 0.75 or less, even more preferably 0.72 or less, and particularly preferably 0.7 or less.

[0016] Regarding condition 2, (R 1 (Total weight of betaines with carbon numbers of 10 to 12) / (R 1 (total weight of betaines having 14 to 22 carbon atoms) is preferably 1.01 to 1.70, more preferably 1.05 to 1.67, even more preferably 1.10 to 1.63, and particularly preferably 1.20 to 1.60, in view of excellent foam-cleaning properties. In addition, (R 1 (Total weight of betaines with carbon numbers of 10 to 12) / (R 1 The total weight of betaines having 14 to 22 carbon atoms is preferably 1.80 or less, more preferably 1.70 or less, even more preferably 1.67 or less, and particularly preferably 1.63 or less.

[0017] Specific examples of the betaine (B) include decyl dimethylamino acetic acid betaine, lauryl dimethylamino acetic acid betaine, tridecyl dimethylamino acetic acid betaine, myristyl dimethylamino acetic acid betaine, palmityl dimethylamino acetic acid betaine, stearyl dimethylamino acetic acid betaine, and behenyl dimethylamino acetic acid betaine.

[0018] The proportion of betaine (B) in the liquid detergent composition of the present invention is preferably 0.3 to 20% by weight in terms of storage stability at low and high temperatures. The upper limit of the proportion is more preferably 18% by weight, more preferably 15% by weight, particularly preferably 12% by weight, and most preferably 10% by weight. On the other hand, the lower limit of the proportion is more preferably 0.5% by weight, more preferably 1% by weight, particularly preferably 2% by weight, and most preferably 3% by weight. For example, 1 to 18% by weight is more preferable, 2 to 15% by weight is more preferable, and 3 to 12% by weight is particularly preferable. In terms of the tendency of the foam movement distance to decrease in the foam adhesion test, the proportion of betaine (B) in the liquid detergent composition is preferably 1% by weight or more, more preferably 2% by weight or more, more preferably 3% by weight or more, and particularly preferably 4% by weight or more.

[0019] [Alkali metal hydroxides (C)] The liquid detergent composition of the present invention contains an alkali metal hydroxide (C). Examples of the alkali metal hydroxide (C) include sodium hydroxide, potassium hydroxide, and lithium hydroxide. The alkali metal hydroxide (C) is preferably at least one selected from sodium hydroxide and potassium hydroxide, and more preferably sodium hydroxide. The inclusion of the alkali metal hydroxide (C) improves the compatibility with the alkali metal hypochlorite (A) and the betaine (B), resulting in excellent storage stability at both low and high temperatures. The proportion of the alkali metal hydroxide (C) in the liquid detergent composition of the present invention is preferably 0.1 to 5% by weight in terms of storage stability at low and high temperatures. The upper limit of the proportion is more preferably 4% by weight, further preferably 3% by weight, and particularly preferably 2% by weight. On the other hand, the lower limit of the proportion is more preferably 0.3% by weight, further preferably 0.4% by weight, and particularly preferably 0.5% by weight. Also, for example, 0.3 to 4% by weight is preferable, 0.4 to 3% by weight is more preferable, and 0.5 to 2% by weight is more preferable.

[0020] [Anionic surfactant (D)] The liquid detergent composition of the present invention preferably contains an anionic surfactant (D). The anionic surfactant (D) is not particularly limited, but in terms of storage stability at low and high temperatures, it is preferable to contain at least one selected from sulfonic acid type anionic surfactants (D1), carboxylate type anionic surfactants (D2), sulfate ester type anionic surfactants (D3), and phosphate ester type anionic surfactants (D4), more preferably at least one selected from sulfonic acid type anionic surfactants (D1) and carboxylate type anionic surfactants (D2), and even more preferably to contain sulfonic acid type anionic surfactants (D1). The anionic surfactant (D) may be used alone or in combination of two or more kinds. From the viewpoint of storage stability at low and high temperatures, the anionic surfactant (D) preferably has an alkyl or alkenyl group having 8 to 18 carbon atoms, more preferably has an alkyl group having 8 to 18 carbon atoms, even more preferably has an alkyl group having 10 to 18 carbon atoms, and particularly preferably has an alkyl group having 12 to 18 carbon atoms.

[0021] Examples of the sulfonic acid type anionic surfactant (D1) include alkylbenzenesulfonates such as linear sodium dodecylbenzenesulfonate and branched sodium dodecylbenzenesulfonate; α-olefinsulfonates such as sodium α-tetradecenesulfonate, sodium α-hexadecenesulfonate, and potassium α-hexadecenesulfonate; alkanesulfonates such as sodium dodecylsulfonate and sodium tetradecylsulfonate; α-sulfofatty acid ester salts such as sodium methyl α-sulfolaurate and sodium methyl methoxyhexaethylene glycol-α-sulfolaurate; acyl isethionates such as sodium cocoyl isethionate and ammonium cocoyl isethionate; N-acyl-N-methyl taurate salts such as sodium cocoyl methyl taurate; dialkyl sulfosuccinates such as sodium dioctyl sulfosuccinate; and alkyl naphthalenesulfonates such as sodium propyl naphthalenesulfonate. As the sulfonic acid type anionic surfactant (D1), alkylbenzenesulfonate, α-olefinsulfonate, alkane sulfonate, and dialkylsulfosuccinate are preferred, and alkylbenzenesulfonate and alkane sulfonate are more preferred. These sulfonic acid type anionic surfactants (D1) may be used alone or in combination of two or more.

[0022] Examples of the carboxylic acid type anionic surfactant (D2) include fatty acid salts and alkyl ether carboxylates, and examples of these salts include alkali metal salts such as sodium and potassium, and alkanolamine salts such as monoethanolamine, diethanolamine, and triethanolamine. Examples of the fatty acid include octyl acid, caprylic acid, lauric acid, myristic acid, palmitic acid, stearyl acid, oleic acid, tridecyl acid, and isotridecyl acid. Examples of the alkyl ether carboxylic acid include polyoxyethylene (3) dodecyl ether carboxylic acid, polyoxyethylene (6) dodecyl ether carboxylic acid, and polyoxyethylene (3) tridecyl ether carboxylic acid. Examples of the carboxylic acid type anionic surfactant (D2) include sodium caprylate, potassium caprylate, sodium laurate, potassium laurate, sodium myristate, potassium myristate, sodium palmitate, and potassium palmitate. These carboxylic acid type anionic surfactants (D2) may be used alone or in combination of two or more.

[0023] Examples of the sulfate ester type anionic surfactant (D3) include alkyl sulfate ester salts such as sodium dodecyl sulfate, potassium dodecyl sulfate, triethanolamine dodecyl sulfate, sodium stearyl sulfate, and sodium oleyl sulfate; polyoxyethylene alkyl ether sulfate ester salts such as polyoxyethylene (3) sodium dodecyl sulfate, polyoxyethylene (3) sodium cetyl sulfate, and polyoxyethylene (3) cetyl sulfate triethanolamine; sulfated oils such as turpentine oil; and sulfated fatty acid ester salts such as sulfated butyl oleate. In the above, polyoxyethylene (3) means a polyoxyethylene group having 3 repeating units of the oxyethylene group. As the sulfate ester type anionic surfactant (D3), alkyl sulfate ester salts, polyoxyethylene alkyl ether sulfate ester salts, and sulfated fatty acid ester salts are preferred, and alkyl sulfate ester salts, polyoxyethylene alkyl ether sulfate ester salts, and the like are more preferred. These sulfate ester type anionic surfactants (D3) may be used alone or in combination of two or more.

[0024] Examples of the phosphate ester type anionic surfactant (D4) include alkyl phosphates such as sodium dodecyl phosphate, potassium dodecyl phosphate, sodium stearyl phosphate, and potassium stearyl phosphate; polyoxyethylene alkyl ether phosphates such as sodium polyoxyethylene (3) lauryl ether phosphate and potassium polyoxyethylene (3) lauryl ether phosphate; and polyoxyethylene alkyl phenyl ether phosphates such as sodium polyoxyethylene (3) lauryl phenyl ether phosphate and potassium polyoxyethylene (3) lauryl phenyl ether phosphate. Examples of the phosphate ester type anionic surfactant (D4) include alkyl phosphate esters and polyoxyethylene alkyl ether phosphate esters, and more preferably alkyl phosphate esters. These phosphate ester type anionic surfactants (D4) may be used alone or in combination of two or more.

[0025] When the cleaning composition of the present invention contains an anionic surfactant (D), the proportion of the anionic surfactant (D) in the cleaning composition of the present invention is preferably 0.2 to 5% by weight in terms of storage stability at low and high temperatures. The upper limit of the proportion is more preferably 4% by weight, further preferably 3% by weight, and particularly preferably 2% by weight. On the other hand, the lower limit of the proportion is more preferably 0.3% by weight, further preferably 0.4% by weight, and particularly preferably 0.5% by weight. Also, for example, 0.3 to 4% by weight is preferable, 0.4 to 3% by weight is more preferable, and 0.5 to 2% by weight is more preferable.

[0026] [Other surfactants (E)] The liquid detergent composition of the present invention may contain other surfactants (E) other than the betaine (B) and the anionic surfactant (D). Examples of the other surfactants (E) include amphoteric surfactants (E1) other than the betaine (B), cationic surfactants (E2), and nonionic surfactants (E3). The other surfactants (E) may be used alone or in combination of two or more.

[0027] The amphoteric surfactant (E1) other than betaine (B) is not particularly limited as long as it is an amphoteric surfactant other than betaine (B) represented by general formula (1), but from the viewpoint of storage stability at low and high temperatures, it is preferable to include amine oxide (E1-1), other betaine (E1-2) other than betaine (B), etc. Amphoteric surfactant (E1) other than betaine (B) may be used alone or in combination of two or more kinds.

[0028] Examples of the amine oxide (E1-1) include alkyl dimethylamine oxide, fatty acid amidopropylamine oxide, etc. Specific examples of the alkyl dimethylamine oxide include decyl dimethylamine oxide, lauryl dimethylamine oxide, myristyl dimethylamine oxide, palmityl dimethylamine oxide, stearyl amine oxide, etc. Examples of the fatty acid amidopropylamine oxide include capric acid amidopropyl dimethylamine oxide, lauric acid amidopropyl dimethylamine oxide, myristic acid amidopropyl dimethylamine oxide, palmitic acid amidopropyl dimethylamine oxide, stearic acid amidopropyl dimethylamine oxide, etc. In terms of storage stability at low and high temperatures, it is preferable to include alkyl dimethylamine oxide.

[0029] Other betaines (E1-2) include, for example, fatty acid amidopropyl-N,N-dimethyl acetate betaine, alkyl-N,N-dimethylethane sulfobetaine, fatty acid amidopropyl-N,N-dimethyl-2-hydroxypropyl sulfobetaine, alkyl carboxymethyl hydroxyethyl imidazolium betaine, etc. Other betaines (E1-2) include, specifically, lauric acid amidopropyl propyl dimethylamino acetate betaine, myristyl amidopropyl dimethylamino acetate betaine, coconut oil fatty acid amidopropyl dimethylamino acetate betaine, N-hydroxyethyl coconut oil fatty acid imidazolium acetate betaine, lauryl hydroxysulfobetaine, etc., and in terms of storage stability at low and high temperatures, it is preferable to include lauryl hydroxysulfobetaine.

[0030] Examples of the quaternary ammonium salt type cationic surfactant (E2-1) include lauryl trimethyl ammonium chloride, alkyl dimethyl benzyl ammonium chloride, etc. These quaternary ammonium salt type cationic surfactants (E2-1) may be used alone or in combination of two or more.

[0031] Examples of the nonionic surfactant (E3) include polyoxyalkylene alkyl ethers (E3-1), polyoxyalkylene alkyl phenyl ethers (E3-2), and ester-based nonionic surfactants (E3-3). From the viewpoint of storage stability at low and high temperatures, it is preferable to include at least one selected from polyoxyethylene (7) lauryl ether, glycerin monolaurate, and polyoxyethylene (24) styryl phenyl ether, and it is more preferable to include polyoxyethylene (24) styryl phenyl ether.

[0032] Examples of the polyoxyalkylene alkyl ether (E3-1) include polyoxyethylene alkyl ethers such as polyoxyethylene (7) lauryl ether, polyoxyethylene (10) lauryl ether, polyoxyethylene (15) cetyl ether, polyoxyethylene (9) sec-alkyl (C12-C15) ether, polyoxyethylene (12) oleyl ether, polyoxyethylene (20) polyoxypropylene (8) cetyl ether, etc. These polyoxyalkylene alkyl ethers (E3-1) may be used alone or in combination of two or more.

[0033] Examples of the polyoxyalkylene alkylphenyl ether (E3-2) include polyoxyethylene alkylphenyl ethers such as polyoxyethylene (10) nonylphenyl ether and polyoxyethylene (24) styrylphenyl ether. These polyoxyalkylene alkyl phenyl ethers (E3-2) may be used alone or in combination of two or more.

[0034] Examples of the ester-based nonionic surfactant (E3-3) include glycerin alkylates such as glycerin monolaurate, glycerin sesquilaurate, glycerin dilaurate, glycerin trilaurate, glycerin monostearate, glycerin sesquistearate, glycerin distearate, glycerin tristearate, glycerin monooleate, glycerin sesquioleate, glycerin dioleate, and glycerin trioleate; polyethylene glycol alkylates such as polyethylene glycol monolaurate, polyethylene glycol stearate, and polyethylene glycol oleate; sorbitan fatty acid esters such as sorbitan monolaurate, sorbitan monostearate, sorbitan monooleate, sorbitan sesquioleate, sorbitan dioleate, and sorbitan trioleate; polyoxyethylene castor oil, polyoxyethylene hydrogenated castor oil, etc. These ester-based nonionic surfactants (E3-3) may be used alone or in combination of two or more.

[0035] [Water (W)] The liquid detergent composition of the present invention preferably contains water (W) from the viewpoint of handling. The proportion of water (W) in the liquid detergent composition of the present invention is not particularly limited, but from the viewpoint of handling of the detergent composition, it is preferably 70 to 98.5% by weight. The upper limit of the proportion is more preferably 95% by weight, further preferably 92% by weight, and particularly preferably 90% by weight. On the other hand, the lower limit of the proportion is more preferably 75% by weight, further preferably 80% by weight, and particularly preferably 85% by weight. Also, for example, 75 to 95% by weight is more preferable, and 80 to 95% by weight is even more preferable.

[0036] [Other components (F)] The liquid detergent composition of the present invention may contain, as other components (F) in addition to the components listed above, other components typically contained in detergents, such as inorganic salts, buffers, chelating agents, preservatives, viscosity adjusters, fragrances, pH adjusters, pigments, solvents, etc., to the extent that the effects of the present invention are not impaired. When the liquid detergent composition of the present invention contains the other component (F), the proportion of the other component (F) in the liquid detergent composition of the present invention is preferably 0.01 to 1 wt% in terms of storage stability at low and high temperatures. The upper limit of the proportion is more preferably 0.8 wt%, further preferably 0.6 wt%, and particularly preferably 0.5 wt%. On the other hand, the lower limit of the proportion is more preferably 0.02 wt%, further preferably 0.05 wt%, and particularly preferably 0.06 wt%. Also, for example, 0.02 to 0.8 wt% is preferable, 0.05 to 0.6 wt% is more preferable, and 0.06 to 0.5 wt% is more preferable.

[0037] Examples of inorganic salts include potassium chloride, sodium chloride, sodium sulfate, etc., and it is preferable to include sodium chloride in terms of storage stability at low and high temperatures. When the liquid detergent composition of the present invention contains an inorganic salt, the proportion of the inorganic salt in the detergent composition of the present invention is preferably 0.1 to 5% by weight in terms of storage stability at low and high temperatures. The upper limit of the proportion is more preferably 4.5% by weight, further preferably 4% by weight, and particularly preferably 3.5% by weight. On the other hand, the lower limit of the proportion is more preferably 0.2% by weight, further preferably 0.3% by weight, and particularly preferably 0.4% by weight. Also, for example, 0.2 to 4.5% by weight is preferable, 0.3 to 4% by weight is more preferable, and 0.4 to 4% by weight is even more preferable.

[0038] [Liquid detergent composition] The liquid detergent composition of the present invention contains the alkali metal hypochlorite (A), the betaine (B) represented by the general formula (1), and the alkali metal hydroxide (C), and satisfies at least one selected from the following condition 1, condition 2, and condition 3: Condition 1: (The above R 1 (Total weight of betaines having 12 to 14 carbon atoms) / ( 1 (Total weight of betaines with carbon numbers of 12 to 16) = 0.2 to 0.8 Condition 2: (The above R 1 (Total weight of betaines having 10 to 12 carbon atoms) / ( 1(total weight of betaines with carbon numbers of 14 to 22) = 1.01 to 1.80 Condition 3: The bubble travel distance in the bubble adhesion test is 73 mm or less The reason why the liquid detergent composition of the present invention has excellent storage stability at low and high temperatures is believed to be that the appropriate distribution of alkyl and / or alkenyl groups in betaine (B) reduces crystallinity, and when alkali metal hypochlorite (A) and alkali metal hydroxide (C) are used in combination, compatibility is effectively improved. In addition, the high adhesion of the foam formed by the liquid detergent composition to the cleaning surface is an indication of the formation of soft foam that is difficult to break due to the suppression of drainage in the foam film, and since the crystallinity of betaine (B) is reduced to form a soft foam, compatibility is effectively improved when alkali metal hypochlorite (A) and alkali metal hydroxide (C) are used in combination.

[0039] In terms of cleaning performance, the foam movement distance in the foam adhesion test of the liquid detergent composition of the present invention is preferably 73 mm or less. The upper limit of the movement distance is more preferably 70 mm, further preferably 60 mm, and particularly preferably 50 mm. On the other hand, the lower limit of the movement distance is more preferably 10 mm, further preferably 20 mm, and particularly preferably 30 mm. Also, for example, 20 mm to 60 mm is more preferable, and 30 mm to 50 mm is even more preferable. The foam movement distance in the foam adhesion test of the present invention is a distance measured by the method described in the Examples.

[0040] In the liquid detergent composition of the present invention, the weight ratio (B / A) of betaine (B) to alkali metal hypochlorite (A) is preferably 1 or more in terms of storage stability at low and high temperatures. The upper limit of the weight ratio is more preferably 20, further preferably 15, and particularly preferably 10. On the other hand, the lower limit of the weight ratio is more preferably 2, further preferably 3, and particularly preferably 4. Also, for example, 2 to 20 is more preferable, 3 to 15 is more preferable, and 4 to 10 is particularly preferable.

[0041] When the liquid detergent composition of the present invention contains an anionic surfactant (D), the weight ratio (B / D) of the betaine (B) to the anionic surfactant (D) is preferably 1 to 50 in terms of storage stability at low and high temperatures. The upper limit of the weight ratio is more preferably 45, more preferably 40, and particularly preferably 35. On the other hand, the lower limit of the weight ratio is more preferably 2, more preferably 3, and particularly preferably 4. Also, for example, 2 to 45 is more preferable, 3 to 40 is more preferable, and 4 to 35 is particularly preferable. In addition, in terms of the tendency of the foam movement distance to decrease in the foam adhesion test, the weight ratio (B / D) of the betaine (B) to the anionic surfactant (D) is preferably 40 or less, more preferably 35 or less, more preferably 30 or less, and particularly preferably 25 or less.

[0042] When the liquid detergent composition of the present invention is diluted with water to a nonvolatile content concentration of 0.1% by weight, the pH at 25° C. is preferably 9 to 13 in terms of storage stability at low and high temperatures. The pH is more preferably 9.2 to 12.7, even more preferably 9.5 to 12.5, and particularly preferably 10 to 12.

[0043] From the viewpoint of cleaning properties, it is preferable that the liquid detergent composition of the present invention does not become cloudy when left standing at -5°C for 30 days. From the viewpoint of foaming properties, it is preferable that the liquid detergent composition of the present invention is one that does not form any precipitate when left standing at 50° C. for 30 days. The presence or absence of cloudiness when the liquid detergent composition was left standing at -5°C for 30 days and the presence or absence of precipitate when left standing at 50°C for 30 days were each determined by the methods described in the Examples.

[0044] Applications of the liquid detergent composition of the present invention include, for example, food containers, cooking utensils, equipment in food and beverage manufacturing factories, wall and floor surfaces within factories, kitchen equipment and devices, piping, drainage pipes, housing, toilets, bathrooms, etc.

[0045] [Method for producing liquid detergent composition] The method for producing the liquid detergent composition of the present invention is not particularly limited, and may be a method of blending the alkali metal hypochlorite (A), betaine (B), and alkali metal hydroxide (C) together with water (W) and other components described above, as necessary, according to a conventional method for producing detergents. In this method, heating or cooling may be performed before or after blending, as necessary.

[0046] [Cleaning method] The cleaning method of the present invention is not particularly limited as long as it is a cleaning method including a step of attaching at least one selected from the liquid detergent composition and the diluted solution thereof to the object to be cleaned and then removing it. For example, the liquid detergent composition may be diluted in advance at a dilution ratio of 1 to 100 times as necessary, and the liquid detergent composition or the diluted solution thereof may be sprayed in a foam form onto the object to be cleaned for cleaning. When diluting the liquid detergent composition, it is usually diluted with water. A dilution ratio of 1 to 100 times can provide good cleaning and foaming properties. When cleaning with the liquid detergent composition of the present invention, a method of putting the diluted solution of the detergent composition into a foam washer and spraying the foam foamed by water pressure or air pressure onto the object to be cleaned, a method of putting the liquid detergent composition into a foam washer, connecting the foam washer to a water supply means such as a tap by a hose or the like, and supplying water to dilute and mix the foamed foam and spraying it onto the object to be cleaned, and the like can be mentioned. Here, the water used for dilution is not particularly limited, but tap water is preferably used.

[0047] In the cleaning method of the present invention, it is preferable to spray the foam obtained by foaming the liquid detergent composition and / or its diluted cleaning solution onto the object to be cleaned, and then hold the foam for a certain period of time, since this improves the cleaning performance. The time for which the foam is held is preferably 1 to 60 minutes, more preferably 1 to 30 minutes, in terms of cleaning efficiency. It is preferable to leave it as it is while the foam state is held, but a small amount of water or the like may be added as appropriate. After the foam is maintained for a certain period of time, it is preferable to rinse the object with water. The temperature of the rinsing water is preferably 10 to 70°C, more preferably 20 to 60°C, from the viewpoint of cleaning performance. Tap water can be used as the rinsing water, and is preferably used at the above water temperature. The rinsing operation is generally performed manually with a hose or the like, but there is no particular limitation as long as the cleaning composition is sufficiently rinsed away by the method. EXAMPLES

[0048] Examples of the present invention will be specifically described below together with comparative examples. Note that the present invention is not limited to these examples. In the following examples and comparative examples, "parts" means "parts by weight" and "%" means "% by weight" unless otherwise specified. In the following Examples and Comparative Examples, the foaming properties, foam-breaking properties, cleaning properties, stability when stored for a long period at low / high temperatures, and foam adhesion properties of the liquid detergent compositions were evaluated by the methods described below.

[0049] [Foaming test (Ross Miles test)] Each liquid detergent composition was diluted with tap water to a non-volatile content of 0.02% by weight to prepare 200 mL of the diluted liquid of the liquid detergent composition. According to the method described in JIS-K3362, 200 mL of the diluted liquid prepared above was dropped onto the liquid surface from a height of 900 mm at 25°C for 30 seconds, and the height of the foam generated when the diluted liquid was dropped onto the liquid surface from a height of 900 mm at 25°C for 30 seconds was measured immediately after foaming and 5 minutes after foaming. The defoaming rate in the Ross Miles test was calculated by the following formula. Defoaming rate (%) = (foam height immediately after foaming - foam height after 5 minutes) / foam height immediately after foaming x 100 (formula) The foaming ability was evaluated based on the foam height immediately after foaming, using the following criteria: ◎: ◯: Pass. ◎: Foam height is 10 cm or more, and foaming properties are very excellent. Good: Foam height is 5 cm or more and less than 10 cm, and foaming properties are excellent. △: The foam height is 3 cm or more and less than 5 cm, and the foaming ability is slightly poor. ×: The foam height is less than 3 cm, and the foaming property is poor.

[0050] [Low temperature storage stability test] 100 g of each liquid detergent composition was placed in a transparent glass airtight container and allowed to stand at -5°C for 30 days, after which the appearance was observed, and ⊚ was used to indicate practicality and pass. Evaluation criteria: ◎: Stable with no separation or cloudiness observed 〇: No overall separation, but some cloudiness is observed ×: Separation or cloudiness is observed

[0051] [High temperature storage stability test] 100 g of each liquid detergent composition was placed in a sealed polypropylene container, and the cleaning properties were evaluated after standing for 30 days at 50° C. Furthermore, the appearance after high-temperature storage was visually confirmed for the presence or absence of precipitates. The cleaning performance was judged according to the following criteria: ◯: Pass. ⊚: The cleaning rate is 60% or more, and cleaning properties are very excellent. ◯: The cleaning rate is 50% or more and less than 60%, and cleaning properties are excellent. Δ: The cleaning rate is 30% or more and less than 50%, and the cleaning ability is slightly poor. ×: The cleaning rate is less than 30%, and cleaning ability is poor.

[0052] [Foam Breaking Test] Each liquid detergent composition was diluted with tap water to a non-volatile content of 0.02% by weight to prepare a diluted liquid detergent composition (500 g), which was placed in a 1 L polypropylene container (inner diameter φ12 cm, height 15 cm) and foamed at 5000 rpm for 3 minutes using a Primix homomixer MARK II 2.5 model. The mixture was then poured into the center of a stainless steel sink (depth 580 mm, width 1400 mm) equipped with a 70 mm diameter, 75 mesh stainless steel sieve at the drain outlet. After one minute, rinsing with water (shower nozzle) was started and the rinsing time until the foam disappeared from the stainless steel sink was measured. The foam-breaking property was judged according to the following criteria: ◯: Passed. ⊚: Rinse time is less than 60 seconds, and foam removal is excellent. ◯: The rinsing time was 60 seconds or more and less than 90 seconds, and the foam-removal property was excellent. Δ: The rinsing time was 90 seconds or more and less than 120 seconds, and the foam removal was somewhat poor. ×: The rinsing time is 120 seconds or more, and the foam removal is poor.

[0053] [Cleanability test (heated oil stains)] A stainless steel piece (W0(g)) measuring 80 mm in length, 15 mm in width, and 1 mm in thickness was coated with 80 μL of oil (10 g of beef tallow, 10 g of soybean oil, 0.25 g of monooleic acid glyceride, and 0.1 g of Sudan Red III dissolved in 60 mL of chloroform) on one side and baked at 180°C for 90 minutes to prepare a test piece and measure its mass (W1(g)). The test piece was immersed in a diluted solution of a cleaning composition prepared by diluting the liquid cleaning composition to a non-volatile content concentration of 5% by weight, left at 25°C for 5 minutes, rinsed with ion-exchanged water, naturally dried, and then measured for mass (W2(g)). The cleaning rate of heated oil stains was calculated from the change in mass of the test piece before and after cleaning using the following formula. Cleaning rate (%) = (W1-W2) / (W1-W0) x 100 (Formula) The cleaning performance was judged according to the following criteria: ◯: Pass. ⊚: The cleaning rate is 60% or more, and cleaning properties are very excellent. ◯: The cleaning rate is 50% or more and less than 60%, and cleaning properties are excellent. Δ: The cleaning rate is 30% or more and less than 50%, and the cleaning ability is slightly poor. ×: The cleaning rate is less than 30%, and cleaning ability is poor.

[0054] [pH] The prepared liquid cleaning composition was diluted with distilled water so that the non-volatile content concentration was 0.1% by weight, and the pH of the diluted solution was measured at 25°C using a pH meter (model number HM-12P) manufactured by DKK-TOA Corporation.

[0055] [Bubble adhesion test] The liquid detergent composition was diluted with ion-exchanged water to a non-volatile content concentration of 5% by weight, and the diluted solution was placed in a container with a foamer pump to produce foam. The foamer pump container was a container of a commercially available pump-type hand detergent (Lion Corporation, Kirei Kirei Foam Hand Soap) that had been washed and used. 0.1 g of foam from the diluted solution obtained using this container was attached to the top of a stainless steel plate [stainless steel (SUS304)] placed at an inclination angle of 30 degrees, and the distance traveled by the foam from the position 3 cm away until 30 seconds later was measured with the bottom end of the foam as the reference point. The shorter the travel distance, the higher the foam adhesion.

[0056] The alkali metal hypochlorite (A), alkali metal hydroxide (C), and anionic surfactant (D) used in the examples and comparative examples are shown below. a-1: Sodium hypochlorite C-1: Sodium hydroxide d-1: Sodium lauryl ether sulfate with 3 moles of polyoxyethylene d-2: Sodium lauryl sulfonate d-3: Sodium stearate (SS-40N, manufactured by Kao Corporation) w-1: Purified water

[0057] [Alkyl group distribution of betaine (B)] The betaine (B) represented by the general formula (1) used in the examples and comparative examples is as shown in the following table.

[0058] [Table 1]

[0059] [Table 2]

[0060] Example 1 In a mixing tank, 2 wt% a-1 sodium hypochlorite, 7 wt% betaine (B-1), 1 wt% c-1 sodium hydroxide, 0.4 wt% d-1 polyoxyethylene 3-mol-added sodium lauryl ether sulfate, and the remainder w-1 purified water were mixed and stirred thoroughly to obtain the liquid cleaning composition of Example 1. The obtained detergent composition was subjected to evaluation tests for foaming ability, foam-removal ability, cleaning ability, and stability when stored for a long period of time at low and high temperatures. The evaluation results are shown in Table 3.

[0061] [Examples 2 to 16 and Comparative Examples 1 to 10] In Examples 2 to 16 and Comparative Examples 1 to 10, detergent compositions were obtained in the same manner as in Example 1, except that the changes were made as shown in Tables 1 to 3. The evaluation results are also shown in Tables 1 to 3. The numerical values ​​of each component other than water in Tables 1 to 3 represent the mass % of the content of each component contained in the liquid detergent composition.

[0062] [Table 3]

[0063] [Table 4]

[0064] [Table 5]

[0065] As shown in Tables 3 to 5, the liquid detergent compositions of Examples 1 to 16 contain an alkali metal hypochlorite (A), a betaine (B) represented by the above general formula (1), and an alkali metal hydroxide (C), and satisfy at least one selected from the above condition 1, the above condition 2, and the above condition 3, and therefore have excellent storage stability at low and high temperatures. On the other hand, the liquid detergent compositions of Comparative Examples 1 to 10 are not the liquid detergent compositions of the present invention and therefore fail to solve the problem.

Claims

1. A liquid detergent composition comprising an alkali metal hypochlorite (A), a betaine (B) represented by the following general formula (1), and an alkali metal hydroxide (C), and satisfying at least one of the following conditions 1, 2, and 3: 【Chemistry 1】 (R in formula (1) １ is an alkyl or alkenyl group having 10 to 22 carbon atoms. Condition 1: (The above R １ (Total weight of betaines having 12 to 14 carbon atoms) / ( １ (total weight of betaines having 12 to 16 carbon atoms) = 0.2 to 0.8 Condition 2: (The above R １ (Total weight of betaines having 10 to 12 carbon atoms) / ( １ (total weight of betaines having 14 to 22 carbon atoms) = 1.01 to 1.80 Condition 3: The bubble movement distance in the bubble adhesion test is 73 mm or less

2. 2. The liquid detergent composition according to claim 1, wherein the content of the betaine (B) is 0.5 to 20% by weight.

3. 3. The liquid detergent composition according to claim 1, wherein the content of the alkali metal hypochlorite (A) is 0.5 to 10% by weight.

4. The condition 1 is １ (Total weight of betaines having 12 to 14 carbon atoms) / ( １ 3. The liquid detergent composition according to claim 1, wherein the total weight of the betaines having 12 to 16 carbon atoms is 0.4 to 0.

7.

5. The condition 2 is １ (Total weight of betaines having 10 to 12 carbon atoms) / ( １ 3. The liquid detergent composition according to claim 1, wherein the total weight of betaines having 14 to 22 carbon atoms is 1.20 to 1.

60.

6. The liquid detergent composition according to claim 1 or 2, wherein the betaine (B) comprises at least three types of betaine.

7. 3. The liquid detergent composition according to claim 1 or 2, further comprising an anionic surfactant (D), and a weight ratio (B / D) of the betaine (B) to the anionic surfactant (D) is 1 to 50.

8. The liquid detergent composition according to claim 7, wherein the anionic surfactant (D) comprises at least one selected from the group consisting of a sulfonic acid type anionic surfactant (D1) and a carboxylate type anionic surfactant (D2).

9. The liquid detergent composition according to claim 1 or 2, which does not become cloudy at -5°C.

10. 3. The liquid detergent composition according to claim 1 or 2, which does not form a precipitate at 50°C.

11. A cleaning method comprising the steps of depositing the liquid detergent composition according to claim 1 or 2, or at least one selected from a dilution of the liquid detergent composition, on an object to be cleaned, and then removing the same.

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