Detergent composition and cleaning method

Abstract

The present invention provides a cleaning agent composition that has a sufficient cleaning effect against dirt caused by the adhesion of oils and greases, in particular a cleaning agent composition that can exhibit a sufficient cleaning effect even when oils and greases are firmly adhered or when a large amount of oils and greases are adhered, a method for producing the same, and a cleaning method using the cleaning agent composition. [Solution] The present invention relates to a detergent composition containing an anionic surfactant and an alkali metal silicate and / or alkali metal hydroxide, wherein the mass ratio of alkali metal silicate and / or alkali metal hydroxide to the anionic surfactant in the detergent composition ([alkali metal silicate and / or alkali metal hydroxide] / anionic surfactant) is 0.08 to 12, and the sum of the content of the anionic surfactant and the content of alkali metal silicate and / or alkali metal hydroxide in the detergent composition is 65% by mass or more, a detergent composition, a method for producing the same, and a cleaning method using the detergent composition.

Description

Technical Field

[0001] The present invention relates to a detergent composition and a washing method.

Background Art

[0002] In order to remove dirt caused by the adhesion of oils and fats, a detergent composition may be used. However, since oils and fats are hardly soluble or insoluble in water, they cannot be easily removed from the object to be washed. Therefore, various detergent compositions are used to remove such dirt that is hardly soluble in water. However, with conventional detergent compositions, a sufficient washing effect could not be obtained particularly when oils and fats etc. were strongly adhered or when a large amount of oils and fats etc. were adhered.

[0003] For example, Patent Document 1 describes a detergent composition for an automatic washing machine containing a silicate selected from an alkali metal metasilicate and an alkali metal orthosilicate, and an alkali metal carbonate etc., and it is described that such a composition has a certain washing effect on dirt such as oils and fats.

[0004] However, while this document contains a large amount of alkali agents such as an alkali metal metasilicate etc. and an alkali metal carbonate etc. as an alkali agent, little attention is paid to the importance of a surfactant, and only a detergent composition containing 1% by mass of a nonionic surfactant as a surfactant is shown in the examples.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] The present invention aims to provide a cleaning agent composition that has a sufficient cleaning effect against dirt caused by the adhesion of oils and greases, and in particular, a cleaning agent composition that can exhibit a sufficient cleaning effect even when oils and greases are firmly adhered or when a large amount of oils and greases are adhered. The present invention also aims to provide a method for producing the cleaning agent composition and a cleaning method using the cleaning agent composition. [Means for solving the problem]

[0007] As a result of diligent research to solve the above problems, the present inventors have found that a detergent composition comprising an anionic surfactant and an alkali metal silicate and / or alkali metal hydroxide, wherein the mass ratio of the anionic surfactant to the alkali metal silicate and / or alkali metal hydroxide in the detergent composition is within a predetermined range, and the sum of the content of the anionic surfactant and the content of the alkali metal silicate and / or alkali metal hydroxide in the detergent composition is equal to or greater than a predetermined amount, can exhibit an excellent cleaning effect against oil stains. Based on these findings, further investigation led to the completion of the present invention.

[0008] In other words, the present invention provides the following detergent composition, a method for producing the same, and a cleaning method using the detergent composition.

[0009] [1] A detergent composition containing an anionic surfactant and an alkali metal silicate and / or alkali metal hydroxide, wherein the mass ratio of alkali metal silicate and / or alkali metal hydroxide to the anionic surfactant in the detergent composition ([alkali metal silicate and / or alkali metal hydroxide] / anionic surfactant) is 0.08 to 12, and the sum of the content of the anionic surfactant and the content of alkali metal silicate and / or alkali metal hydroxide in the detergent composition is 65% by mass or more. [2] The detergent composition according to [1], wherein the content of an anionic surfactant in the detergent composition is 8% by mass or more. [3] The detergent composition according to [1] or [2], wherein the anionic surfactant is one or more selected from the group consisting of fatty acid salts, alkyl sulfate salts, alkylbenzene sulfonates, olefin sulfonates, alkylnaphthalene sulfonates, dialkyl sulfosuccinates, alkyldiaryl ether sulfonates, alkyl phosphates, naphthalene sulfonic acid formalin condensates, aromatic sulfonic acid formalin condensates, polyoxyethylene alkyl ether sulfate salts, and alkyl sulfosuccinates. [4] The detergent composition according to any one of [1] to [3], wherein the content of alkali metal silicate and / or alkali metal hydroxide in the detergent composition is 8% by mass or more. [5] The detergent composition according to any one of [1] to [4], wherein the pH of a 2.4% by mass aqueous solution of the detergent composition is 11 or higher. [6] A detergent composition according to any one of [1] to [5], further comprising an oxygen-based oxidizing agent and / or a halogen-based oxidizing agent. [7] A detergent composition according to any one of [1] to [5], further comprising an oxygen-based oxidizing agent and a halogen-based oxidizing agent. [8] The cleaning agent composition according to [6] or [7], wherein the halogenated oxidizing agent has a coating layer. [9] A detergent composition according to any one of [1] to [8] that generates gas and bubbles when dissolved in water.

[10] An aqueous solution of a detergent obtained by dissolving any of the detergent compositions described in [1] to [9] in water. A method for producing a detergent composition according to any one of [1] to [9], wherein the mass ratio of alkali metal silicate and / or alkali metal hydroxide to an anionic surfactant in the detergent composition is 0.08 to 12, and the total of the content of the anionic surfactant and the content of alkali metal silicate and / or alkali metal hydroxide in the detergent composition is 65% by mass or more.

[12] A cleaning method comprising the step of bringing an aqueous solution of a cleaning agent composition described in any of [1] to [9] or an aqueous cleaning agent solution described in

[10] into contact with an object to be cleaned. [Effects of the Invention]

[0010] The cleaning agent composition of the present invention contains an anionic surfactant and an alkali metal silicate and / or alkali metal hydroxide, wherein the mass ratio of the two in the cleaning agent composition is within a predetermined range, and the total content of the two in the cleaning agent composition is equal to or greater than a predetermined amount. As a result, it exhibits an excellent cleaning effect against oils and greases. In particular, it exhibits an excellent cleaning effect even when oils and greases are firmly and / or heavily attached to the substrate to be cleaned.

[0011] Furthermore, if the cleaning agent composition also contains an oxygen-based oxidizing agent and / or a halogen-based oxidizing agent, it can impart effects such as bleaching and / or disinfection. In particular, when the cleaning agent composition contains an oxygen-based oxidizing agent (e.g., sodium percarbonate) and a halogen-based oxidizing agent (e.g., halogenated isocyanuric acid), gas (oxygen gas) is generated and bubbles form when dissolved in water, allowing the cleaning agent composition to dissolve quickly in water and enabling the preparation of an aqueous cleaning agent solution more efficiently in a shorter time. In addition, since the amount of undissolved cleaning agent composition can be reduced, the risk of damage to the substrate caused by contact between undissolved particles and the substrate of the object being cleaned can be reduced.

[0012] Furthermore, if the halogenated oxidizing agent is coated with a coating layer (organic and / or inorganic), it is possible to suppress the deactivation or decomposition of the halogenated oxidizing agent by reacting with other components during storage of the cleaning agent composition. In addition, even if an acid or other substance is accidentally mixed into the cleaning agent composition, the risk of chlorine gas generation can be reduced. Furthermore, it is possible to suppress the temperature rise when the composition comes into contact with water.

[0013] The cleaning agent composition of the present invention, when used under appropriate cleaning conditions, can exhibit excellent cleaning effects against oil stains while preventing damage or deterioration of the substrate being cleaned. [Modes for carrying out the invention]

[0014] (Detergent composition) The detergent composition of the present invention contains an anionic surfactant and an alkali metal silicate and / or alkali metal hydroxide, wherein the mass ratio of alkali metal silicate and / or alkali metal hydroxide to the anionic surfactant in the detergent composition is 0.08 to 12, and the total content of the anionic surfactant and alkali metal silicate and / or alkali metal hydroxide in the detergent composition is 65% by mass or more. The detergent composition of the present invention is a solid and may take the form of, for example, a powder, granules, tablets, or a mixture thereof. The components included in the detergent composition of the present invention will be described below.

[0015] (Anionic surfactant) The cleaning agent composition of the present invention contains an anionic surfactant. The anionic surfactant is readily available, has sufficient cleaning effect against oily stains, and exhibits excellent compatibility with halogenated oxidizing agents and / or oxygenated oxidizing agents described later. Examples of anionic surfactants include fatty acid salts, alkyl sulfate salts, alkylbenzene sulfonates, olefin sulfonates, alkylnaphthalene sulfonates, dialkyl sulfosuccinates, alkyldiaryl ether sulfonates, alkyl phosphates, naphthalene sulfonic acid formalin condensates, aromatic sulfonic acid formalin condensates, polyoxyethylene alkyl ether sulfate salts, alkyl sulfosuccinates, and the like. One or more of these can be used in combination.

[0016] For example, one or more fatty acid salts selected from the group consisting of potassium oleate soap, potassium castor oil soap, sodium semi-hardened beef tallow fatty acid soap, potassium semi-hardened beef tallow fatty acid soap, and mixtures thereof can be used. Alkyl sulfate ester salts can be selected from the group consisting of, for example, sodium lauryl sulfate, sodium higher alcohol sulfate, triethanolamine lauryl sulfate, ammonium lauryl sulfate, and mixtures thereof, one or more of these. As the alkylbenzenesulfonate, for example, sodium C12 - C14 branched or linear alkylbenzenesulfonate can be used. As the olefinsulfonate, for example, one or more selected from the group consisting of sodium C14 - C18 α-olefinsulfonate and mixtures thereof can be used. As the alkylnaphthalenesulfonate, for example, sodium alkylnaphthalenesulfonate can be used. As the dialkylsulfosuccinate, for example, sodium dialkylsulfosuccinate can be used. As the alkyldiarylethersulfonate, for example, sodium alkyldiphenylether disulfonate can be used. As the alkylphosphate, for example, potassium alkylphosphate can be used. As the naphthalenesulfonic acid formalin condensate, for example, the sodium salt of β-naphthalenesulfonic acid formalin condensate can be used. As the aromatic sulfonic acid formalin condensate, for example, the sodium salt of aromatic sulfonic acid formalin condensate can be used. As the polyoxyethylene alkyl ether sulfate ester salt, for example, sodium polyoxyethylene lauryl ether sulfate can be used. As the alkylsulfosuccinate, for example, sodium alkylsulfosuccinate can be used. As the salt, one or more selected from the group consisting of sodium salt, potassium salt and mixtures thereof are preferred.

[0017] From the viewpoint of particularly excellent blending stability with the halogen-based oxidant described later, the anionic surfactant is preferably one or more selected from the group consisting of alkylbenzenesulfonate, olefinsulfonate and alkyl sulfate ester salt. It is more preferable that the alkylbenzenesulfonic acid is sodium linear alkylbenzenesulfonate, the olefinsulfonate is sodium α-olefinsulfonate, the alkyl sulfate ester salt is sodium lauryl sulfate and one or more selected from the group consisting of mixtures thereof.

[0018] From the viewpoint of obtaining sufficient surfactant activity, the content of anionic surfactants in a detergent composition is usually 8% by mass or more, more preferably 15% by mass or more, even more preferably 20% by mass or more, and particularly preferably 30% by mass or more. Furthermore, from the viewpoint of enhancing the cleaning effect by including components other than anionic surfactants (for example, oxygen-based oxidizing agents and / or halogen-based oxidizing agents described later), the content is usually 92% by mass or less, more preferably 85% by mass or less, even more preferably 75% by mass or less, and particularly preferably 65% ​​by mass or less. Note that if the detergent composition contains two or more types of anionic surfactants, the content of anionic surfactants refers to the sum of the content of each anionic surfactant.

[0019] The detergent composition may contain other surfactants besides anionic surfactants, to the extent that they do not adversely affect the effects of the present invention. Examples of other surfactants include nonionic surfactants, cationic surfactants, amphoteric surfactants, and mixtures thereof.

[0020] Examples of nonionic surfactants include alkyl ethers, polyoxyethylene alkyl ethers, EO·PO block polymers, sorbitan fatty acid esters, polyoxyethylene sorbitan fatty acid esters, polyethylene glycol fatty acid esters, polyoxyethylene alkylamines, alkyl alkanolamides, glycerin fatty acid esters, and sucrose fatty acid esters. One or more of these can be used in combination.

[0021] The alkyl ether can be one or more selected from the group consisting of, for example, lauryl alcohol alkoxylate, lauryl alcohol ethoxylate, oleyl alcohol ethoxylate, primary alcohol ethoxylate, and mixtures thereof. For example, one or more polyoxyethylene alkyl ethers selected from the group consisting of polyoxyethylene cetyl ether, polyoxyethylene stearyl ether, polyoxyethylene oleyl ether, polyoxyethylene higher alcohol ether, and mixtures thereof can be used. EO·PO block polymers can be, for example, one or more selected from the group consisting of polyoxyethylene-polyoxypropylene block polymers, reverse-type polyoxyethylene-polyoxypropylene block polymers, polyoxyethylene-polyoxypropylene condensates, ethylenediamine-based polyoxyethylene-polyoxypropylene block polymers, reverse-type ethylenediamine-based polyoxyethylene-polyoxypropylene block polymers, and mixtures thereof. For example, one or more sorbitan fatty acid esters selected from the group consisting of sorbitan laurate, sorbitan palmitate, sorbitan stearate, sorbitan oleate, and mixtures thereof can be used. Polyoxyethylene sorbitan fatty acid esters can be, for example, one or more selected from the group consisting of polyoxyethylene sorbitan laurate, polyoxyethylene sorbitan palmitate, polyoxyethylene sorbitan stearate, polyoxyethylene sorbitan oleate, and mixtures thereof. Polyethylene glycol fatty acid esters can be, for example, one or more selected from the group consisting of polyethylene glycol laurate, polyethylene glycol stearate, polyethylene glycol oleate, and mixtures thereof. Polyoxyethylene alkylamines can be, for example, one or more selected from the group consisting of polyoxyethylene laurylamine, polyoxyethylene stearylamine, ethylenediamine-polyoxyethylene-polyoxypropylene block polymers, and mixtures thereof. Alkyl alkanolamides can be selected from the group consisting of, for example, lauric acid monoethanolamide, lauric acid diethanolamide, myristic acid monoethanolamide, myristic acid diethanolamide, stearic acid monoethanolamide, stearic acid diethanolamide, coconut oil fatty acid monoethanolamide, coconut oil fatty acid diethanolamide, and mixtures thereof, one or more of these. Glycerin fatty acid esters can be selected from the group consisting of, for example, monoglyceride stearate, diglyceride stearate, monoglyceride palmitate, diglyceride palmitate, monoglyceride oleate, diglyceride oleate, and mixtures thereof, one or more of these. Sucrose fatty acid esters can be selected from the group consisting of, for example, sucrose laurate, sucrose myristic acid, sucrose palmitate, sucrose stearate, sucrose oleate, sucrose behenic acid, sucrose erucate, and mixtures thereof, one or more of these.

[0022] Examples of cationic surfactants include alkylamine salts and quaternary ammonium salts. One or more of these can be used in combination.

[0023] The alkylamine salt can be one or more selected from the group consisting of coconutamine acetate, stearylamine acetate, and mixtures thereof, for example. Quaternary ammonium salts can be selected from the group consisting of, for example, lauryltrimethylammonium salt, stearyltrimethylammonium salt, distearyldimethylammonium salt, alkylbenzyldimethylammonium salt, cetyltrimethylammonium salt, stearyltrimethylammonium salt, behenyltrimethylammonium salt, distearyldimethylammonium salt, diisotetradecyldimethylammonium salt, cetylpyridinium chloride, benzethonium chloride, benzalkonium chloride, didecyldimethylammonium chloride, and mixtures thereof, one or more of these.

[0024] Examples of amphoteric surfactants include alkyl betaines and amine oxides. One or more of these can be used in combination.

[0025] Alkyl betaines can be selected from the group consisting of, for example, lauryl betaine, stearyl betaine, 2-alkyl-N-carboxymethyl-N-hydroxyethylimidazolinium betaine, and mixtures thereof, one or more of these. For example, amine oxides such as lauryldimethylamine oxide can be used.

[0026] The content of surfactants other than anionic surfactants in the detergent composition is, for example, 10% by mass or less, preferably 5% by mass or less, and more preferably 3% by mass or less. Furthermore, the content of the other surfactants relative to 100 parts by mass of the total mass of anionic surfactants in the detergent composition is preferably 50 parts by mass or less, more preferably 20 parts by mass or less, and even more preferably 10 parts by mass or less.

[0027] (Alkali metal silicates and / or alkali metal hydroxides) The cleaning agent composition of the present invention contains alkali metal silicates and / or alkali metal hydroxides. That is, it contains one or more selected from the group consisting of alkali metal silicates and alkali metal hydroxides. The content of alkali metal silicates and / or alkali metal hydroxides means the sum of the content of each alkali metal silicate and / or alkali metal hydroxide when two or more types of alkali metal silicates and / or alkali metal hydroxides are included. If these can take the form of hydrates, those hydrates are also included. In the case of hydrates, it means the content of the hydrates. By containing alkali metal silicates and / or alkali metal hydroxides, the cleaning agent composition of the present invention can raise the pH when dissolved in an aqueous solution, promoting the hydrolysis of oil contained in oil stains, thus providing excellent cleaning effect.

[0028] Alkali metal silicates include, for example, one or more selected from the group consisting of alkali metal orthosilicate salts, hydrates of alkali metal orthosilicate salts, alkali metal metasilicate salts, hydrates of alkali metal metasilicate salts, and mixtures thereof. Among alkali metal salts, sodium salts and potassium salts are preferred from the viewpoint of solubility in water and availability.

[0029] Among alkali metal silicates, one or more selected from the group consisting of sodium metasilicate, sodium metasilicate hydrate, sodium orthosilicate, sodium orthosilicate hydrate, and mixtures thereof are preferred from the viewpoint of ease of handling, availability, and alkalinity. For sodium metasilicate hydrate, one or more selected from the group consisting of sodium metasilicate pentahydrate, sodium metasilicate notahydrate, and mixtures thereof are preferred. The number of added water molecules for sodium orthosilicate hydrate is not particularly limited.

[0030] Examples of alkali metal hydroxides include one or more selected from the group consisting of lithium hydroxide, sodium hydroxide, potassium hydroxide, and mixtures thereof. Sodium hydroxide is preferred from the viewpoint of ease of handling and availability.

[0031] The detergent composition of the present invention may contain other alkaline compounds other than the alkali metal silicates and / or alkali metal hydroxides, to the extent that they do not adversely affect the effects of the present invention. Alkaline compounds refer to compounds that exhibit alkalinity when dissolved in water, among metal salts or hydroxides of inorganic and organic substances. Examples of other alkaline compounds include metal salts of phosphoric acid, hydroxides and carbonates of alkaline earth metals, hydrates thereof, and mixtures thereof. The content of other alkaline compounds in the detergent composition is, for example, 1% by mass or more and 30% by mass or less, and preferably 0.5% by mass or more and 15% by mass or less.

[0032] Examples of metal salts of phosphoric acid include metal hydrogen phosphate, metal phosphate, metal pyrophosphate, metal tripolyphosphate, metal tetrapolyphosphate, metal pentapolyphosphate, metal metaphosphate, hydrates thereof, and mixtures thereof. Examples of alkaline earth metal hydroxides include beryllium hydroxide, calcium hydroxide, magnesium hydroxide, and mixtures thereof. Examples of carbonates include sodium carbonate (sometimes referred to as soda ash), sodium bicarbonate (sometimes referred to as baking soda), potassium carbonate, potassium bicarbonate, ammonium carbonate, sodium sesquicarbonate, and mixtures thereof.

[0033] From the viewpoint of promoting the hydrolysis of oils and fats, the content of alkali metal silicates and / or alkali metal hydroxides in the detergent composition is usually 8% by mass or more, preferably 15% by mass or more, more preferably 20% by mass or more, and particularly preferably 30% by mass or more. Furthermore, from the viewpoint of including components other than alkali metal silicates and / or alkali metal hydroxides to enhance the cleaning effect, the content is usually 92% by mass or less, more preferably 85% by mass or less, even more preferably 75% by mass or less, and particularly preferably 65% ​​by mass or less. As described later, when the detergent composition is dissolved in water to make a 2.4% by mass aqueous detergent solution, it is preferable to adjust the content of alkali metal silicates and / or alkali metal hydroxides so that the pH of the aqueous solution (at 25°C) is 11 or higher.

[0034] The mass ratio of alkali metal silicate and / or alkali metal hydroxide to an anionic surfactant in the detergent composition ([alkali metal silicate and / or alkali metal hydroxide] / anionic surfactant) is 0.08 to 12, preferably 0.1 to 10, more preferably 0.2 to 5, and particularly preferably 0.4 to 2, from the viewpoint of cleaning effect against oil stains.

[0035] The total content of anionic surfactants and alkali metal silicates and / or alkali metal hydroxides in the detergent composition is 65% by mass or more, preferably 69% by mass or more, more preferably 74% by mass or more, and even more preferably 78% by mass or more, from the viewpoint of cleaning effect against oil stains. The total content can be, for example, 100% by mass or less, 95% by mass or less, 90% by mass or less, or 85% by mass or less.

[0036] Alkali metal silicates and / or alkali metal hydroxides are usually solids, and their form is preferably powder or particles. The smaller the average particle size of the powder, the faster it dissolves in water, while a larger average particle size reduces dusting during use, making it easier to use. A fast dissolution rate in water helps avoid damage to the substrate caused by localized high concentrations due to undissolved components in the aqueous solution. To achieve both a fast dissolution rate and ease of handling by reducing dusting, the average particle size is preferably 1 to 5000 μm, more preferably 10 to 3000 μm, and even more preferably 100 to 2000 μm. This average particle size can be measured according to the measurement method for "average particle size of raw material components and detergent composition" described later.

[0037] (Other ingredients) The cleaning agent composition of the present invention may further contain halogen-based oxidizing agents, oxygen-based oxidizing agents, etc., from the viewpoint of providing bleaching and disinfecting effects. The halogen-based oxidizing agent may have a coating layer on its surface.

[0038] (Halogenated oxidizing agents) Halogenated oxidizing agents are compounds that dissolve in water to produce free halogens (hypohaloic acids such as hypochlorous acid, hypohalite ions, molecular halogens such as chlorine), and include, for example, one or more selected from the group consisting of halogenated isocyanuric acid, alkali metal salts of halogenated isocyanuric acid, hydrates of alkali metal salts of halogenated isocyanuric acid, halogenated hydantoin, metal salts of hypochlorite, and mixtures thereof.

[0039] The halogenated isocyanuric acid, alkali metal salts of halogenated isocyanuric acid, and hydrates of alkali metal salts of halogenated isocyanuric acid are preferably one or more selected from the group consisting of, for example, trichloroisocyanuric acid, sodium dichloroisocyanurate, sodium dichloroisocyanurate hydrate, potassium dichloroisocyanurate, and mixtures thereof. From the viewpoint of availability and safety, one or more selected from the group consisting of trichloroisocyanuric acid, sodium dichloroisocyanurate, sodium dichloroisocyanurate hydrate, and mixtures thereof are more preferable.

[0040] The halogenated hydantoin is preferably one or more selected from the group consisting of, for example, 1,3-dichloro-5,5-dimethylhydantoin, 1-bromo-3-chloro-5,5-dimethylhydantoin, 1-chloro-3-bromo-5,5-dimethylhydantoin, 1,3-dibromo-5,5-dimethylhydantoin, 1,3-dichloro-5,5-ethylmethylhydantoin, and mixtures thereof. Note that 1-bromo-3-chloro-5,5-dimethylhydantoin and 1-chloro-3-bromo-5,5-dimethylhydantoin are sometimes collectively referred to simply as bromochloro-5,5-dimethylhydantoin.

[0041] The metal hypochlorite salts are preferably calcium hypochlorite (bleaching powder) or crystallized sodium hypochlorite.

[0042] The halogenated oxidizing agent is a solid and can take the form of, for example, powder, granules, or tablets. It is preferably a powder. These forms can be prepared by known methods. The average particle size of the halogenated oxidizing agent is typically 1 to 5000 μm, preferably 10 to 3000 μm, and more preferably 50 to 2000 μm. This average particle size can be measured according to the measurement method for "average particle size of raw material components and detergent composition" described later.

[0043] When a halogenated oxidizing agent is a chlorine-based oxidizing agent, its effective chlorine content (in Cl2 equivalent) can be calculated using iodine titration. Specifically, the iodine released by the reaction of activated chlorine with potassium iodide is titrated with an aqueous sodium thiosulfate solution, and the effective chlorine content is calculated using the following formula 1.

[0044] Effective chlorine content (%) = a × f × 0.35452 / b (Equation 1) a: 0.1N sodium thiosulfate aqueous solution required for titration (ml) b: Sample (g) f: Factor of 0.1N sodium thiosulfate aqueous solution

[0045] Halogenated oxidizing agents are commercially available; for example, sodium dichloroisocyanurate and sodium trichloroisocyanurate can be easily obtained from Shikoku Chemicals Co., Ltd. under the trade name Neochlor (registered trademark).

[0046] In the detergent composition of the present invention, the halogenated oxidizing agent is an optional component, but its inclusion can impart a bleaching effect to the detergent composition, or, when used in combination with an oxygen-based oxidizing agent, can produce a foaming effect. The content of the halogenated oxidizing agent in the detergent composition is usually 30% by mass or less, preferably 25% by mass or less, and more preferably 20% by mass or less. When an oxygen-based oxidizing agent is included, the content of the halogenated oxidizing agent can be, for example, 1 to 20% by mass, more preferably 1 to 15% by mass, and particularly 2 to 10% by mass.

[0047] (Halogenated oxidizing agent with a coating layer) Solid halogen-based oxidizing agents, such as particles, granules, or tablets, can also be used if their surface is coated with a coating layer. This is because the coating layer protects the surface of the halogen-based oxidizing agent, preventing deactivation or decomposition due to reaction between the halogen-based oxidizing agent and other components during storage of the cleaning agent composition. Furthermore, it reduces the risk of chlorine gas generation even if acids or other substances are accidentally mixed into the cleaning agent composition. The halogen-based oxidizing agents used here can be those described above.

[0048] The compound used in the coating layer is not particularly limited as long as it is a compound that can coat the surface of the halogen-based oxidizing agent and suppress the interaction between the halogen-based oxidizing agent and oxygen-based oxidizing agents or other components.

[0049] Examples of compounds that can be used in the coating layer include metal salts of carboxylic acids, polysaccharides, higher fatty acids, paraffin wax, zeolites, and resins. These compounds may be used individually or in combination of two or more compounds. When using two or more compounds in combination, the two or more compounds may be mixed to form a coating layer containing multiple compounds, or a coating layer may be formed with one compound, and then another coating layer may be formed with other compounds to form a multilayer structure.

[0050] "The halogen-based oxidizing agent is covered with a coating layer" means that the halogen-based oxidizing agent is completely or incompletely covered with a coating layer, to the extent that the effects of the present invention are not impaired. Specifically, this includes both cases where the entire amount of the halogen-based oxidizing agent is covered with a coating layer and cases where only a part of it is covered. Furthermore, it includes both cases where the surface of individual halogen-based oxidizing agents, such as powders, is completely covered with a coating layer and cases where their surfaces are partially covered.

[0051] The coating layer in a halogenated oxidizing agent having a coating layer may contain a metal salt of a carboxylic acid. From the viewpoint of facilitating the formation of a coating layer on the surface of the solid halogenated oxidizing agent, the content of the metal salt of the carboxylic acid is preferably 30% by mass or more, more preferably 50% by mass or more, and even more preferably 70% by mass or more, when the total mass of the coating layer is 100% by mass.

[0052] In halogenated oxidizing agents having a coating layer, the percentage (by mass) of the coating layer is preferably 5% by mass or more, more preferably 10% by mass or more, and even more preferably 15% by mass or more, from the viewpoint of effectively suppressing the interaction between the halogenated oxidizing agent and other components by the coating layer, when the total mass of the halogenated oxidizing agent having the coating layer is taken as 100% by mass. Furthermore, from the viewpoint of achieving the above effect without the percentage of the coating layer being excessive, the upper limit is preferably 70% by mass or less, more preferably 50% by mass or less, and even more preferably 45% by mass or less.

[0053] The proportion (by mass) of the halogenated oxidizing agent in the halogenated oxidizing agent having the coating layer is preferably 30% by mass or more, more preferably 50% by mass or more, and even more preferably 55% by mass or more, when the total mass of the halogenated oxidizing agent having the coating layer is taken as 100% by mass. The upper limit is preferably 95% by mass or less, more preferably 90% by mass or less, and even more preferably 85% by mass or less.

[0054] A halogenated oxidizing agent having a coating layer can be manufactured by forming a coating layer on a solid halogenated oxidizing agent. The manufacturing method is not particularly limited, but known methods such as the stirring method, rolling method, and fluidized bed method may be employed, or a combination thereof may be used. A halogenated oxidizing agent having a coating layer can also be manufactured by contacting a coating solution containing a metal salt of a carboxylic acid, etc., with the surface of a solid halogenated oxidizing agent. For example, it can be manufactured according to or in accordance with the method described in International Publication No. 2017 / 183726.

[0055] The halogenated oxidizing agent having a coating layer is solid and can take the form of, for example, powder, granules, or tablets. Preferably, it is a powder. The average particle size of the halogenated oxidizing agent having a coating layer is typically 1 to 5000 μm, preferably 10 to 3000 μm, and more preferably 50 to 2000 μm. This average particle size can be measured according to the measurement method for "average particle size of raw material components and detergent composition" described later.

[0056] (Oxygen-based oxidizing agent) Oxygen-based oxidizing agents refer to organic or inorganic peroxides, hydrogen peroxide adducts, or hydrogen peroxide, and include, for example, percarbonates, perborates, peroxysulfates, and organic peroxides containing perbenzoic acid. Examples of percarbonates include sodium carbonate hydrogen peroxide adduct (sometimes simply called sodium percarbonate), which is obtained by adding hydrogen peroxide to sodium carbonate. Examples of perborates include sodium perborate. Examples of peroxysulfates include peroxysulfate-sulfate-pentatum salt, peroxodisulfate potassium salt, and mixtures thereof. From the viewpoint of ease of availability and handling, the oxygen-based oxidizing agent is preferably one or more selected from the group consisting of sodium percarbonate, sodium perborate, peroxysulfate-pentapotassium salt (for example, the oxidizing agent containing peroxysulfate-pentapotassium salt is "Oxon" (registered trademark)) and mixtures thereof. From the viewpoint of reactivity with organic matter and oxidizing power, the oxidizing agent containing sodium percarbonate is particularly preferred.

[0057] The oxygen-based oxidizing agent is a solid and can take the form of, for example, powder, granules, or tablets. Powder is preferred. These forms can be prepared by known methods. The average particle size of the oxygen-based oxidizing agent is typically 1 to 5000 μm, preferably 10 to 3000 μm, and more preferably 50 to 2000 μm. This average particle size can be measured according to the measurement method for "average particle size of raw material components and detergent composition" described later.

[0058] The effective oxygen content (O2 equivalent) in an oxygen-based oxidizing agent can be calculated using iodine titration. Specifically, the iodine released by the reaction of reactive oxygen species with potassium iodide is titrated with a sodium thiosulfate solution, and the effective oxygen content is calculated using the following formula 2. To accelerate the reaction between reactive oxygen species and potassium iodide, a small amount of ammonium molybdate aqueous solution adjusted to 1% by mass may be added.

[0059] Effective oxygen content (%) = a × f × 0.08000 / b (Equation 2) a: (ml) 0.1N sodium thiosulfate solution required for titration b: Sample (g) f: Factor of 0.1N sodium thiosulfate solution

[0060] Oxygen-based oxidizing agents are commercially available; for example, sodium percarbonate is readily available from Hodogaya Chemical Co., Ltd. under the trade name PC-A.

[0061] In the detergent composition of the present invention, the oxygen-based oxidizing agent is an optional component, but its inclusion can impart a bleaching effect to the detergent composition or, when used in combination with a halogen-based oxidizing agent, can exhibit a foaming effect. The content of the oxygen-based oxidizing agent in the detergent composition is usually 30% by mass or less, preferably 25% by mass or less, more preferably 20% by mass or less, and particularly preferably 15% by mass or less. When a halogen-based oxidizing agent is included, the content of the oxygen-based oxidizing agent can be, for example, 1 to 20% by mass, more preferably 2 to 15% by mass, and particularly preferably 3 to 10% by mass.

[0062] When a detergent composition contains both a halogenated oxidizing agent and an oxygenated oxidizing agent, foaming occurs when the detergent composition is added to water. For example, when sodium dichloroisocyanurate is used as the halogenated oxidizing agent and sodium percarbonate is used as the oxygenated oxidizing agent, 1 mole of sodium dichloroisocyanurate generates 2 moles of hypochlorous acid when dissolved in water. On the other hand, 1 mole of sodium percarbonate, which has 1.5 molecules of hydrogen peroxide attached to 1 molecule of sodium carbonate, generates 1.5 moles of hydrogen peroxide when dissolved in water. In water, hypochlorous acid and hydrogen peroxide produce hydrochloric acid, water, and oxygen according to (I) below. HClO+H2O2→ HCl+H2O+O2···(I) If either sodium dichloroisocyanurate or sodium percarbonate is in excess, hypochlorous acid or hydrogen peroxide will remain in the aqueous solution after foaming. The remaining hypochlorous acid (or hydrogen peroxide) can be measured for its effective chlorine content (or effective oxygen content) using the formula 1 (or formula 2) described above.

[0063] When the detergent composition of the present invention contains an oxygen-based oxidizing agent and a halogen-based oxidizing agent, the content ratio of the oxygen-based oxidizing agent and the halogen-based oxidizing agent in the detergent composition is preferably such that the molar ratio of hydrogen peroxide to hypochlorous acid generated when the detergent composition is dissolved in water is 10:1 to 1:10, more preferably 5:1 to 1:5, even more preferably 4:1 to 1:4, and particularly preferably 3:2 to 2:3.

[0064] (Other additives) The cleaning agent composition of the present invention may further contain additives to effectively clean oil stains. The cleaning agent composition of the present invention may contain other additives such as flocculants, organic acids, organic polymers, fragrances, dyes, enzymes, and inorganic substances, as long as they do not impair the effects of the present invention. Not only solid additives but also liquid additives can be used. For example, liquid additives may be pre-mixed with porous inorganic powders such as zeolite to support the liquid components on the inorganic material before being included in the composition.

[0065] The organic acid is not particularly limited, but since it is solid at room temperature and pressure and easy to handle, one or more selected from oxalic acid, malonic acid, succinic acid, fumaric acid, maleic acid, D-tartaric acid, L-tartaric acid, D-malic acid, L-malic acid, D-aspartic acid, L-aspartic acid, glutaric acid, D-glutamic acid, L-glutamic acid, citric acid, benzoic acid, and mixtures thereof are preferred. From the viewpoint of excellent compatibility with solid halogen-based oxidizing agents (hypochlorous acid sources) such as sodium dichloroisocyanurate, one or more selected from succinic acid, fumaric acid, and mixtures thereof are more preferred.

[0066] Organic polymers include organic polymers other than the compounds listed as organic flocculants above. For example, polysaccharides such as carrageenan, guar gum, locust bean gum, alkali metal salts of alginic acid, dextrin, xanthan gum, starch or derivatives thereof; one or more selected from the group consisting of methylcellulose, ethylcellulose, hydroxypropylcellulose, hydroxyethylcellulose, other cellulose derivatives and mixtures thereof. Alternatively, organic polymers include one or more selected from the group consisting of polyvinyl alcohol, polyethylene glycol, olefin-maleic anhydride copolymers and their alkali metal salts, acrylic acid-sulfonic acid copolymers and their alkali metal salts, and mixtures thereof.

[0067] In addition to the inorganic flocculants mentioned above, inorganic substances include, for example, sulfates, acetates, carbonates, hydroxides of alkaline earth metals, chlorides of alkali metals, aluminum sulfates, siloxanes, clay-like minerals, and boron compounds. Inorganic substances can be added for purposes such as building up the composition (bulking it up), adjusting pH, adjusting viscosity, improving fluidity, stabilizing to prevent swelling, and as additives for labeling substances for concentration control. It is preferable that the inorganic substances contain boron oxide. The inorganic content in the detergent composition is preferably 0.5% by mass or more, more preferably 1% by mass or more, and even more preferably 2% by mass or more, relative to the total mass of the detergent composition. Furthermore, if the inorganic content does not directly contribute to the cleaning effect, from the viewpoint of containing as many cleaning-contributing components as possible, the inorganic content is preferably 20% by mass or less, more preferably 15% by mass or less, and even more preferably 10% by mass or less.

[0068] (Manufacturing of detergent compositions) The detergent composition of the present invention can be manufactured by mixing an anionic surfactant, an alkali metal silicate and / or alkali metal hydroxide, and other components or additives as needed. Specifically, the detergent composition can be manufactured by mixing such that the mass ratio of alkali metal silicate and / or alkali metal hydroxide to an anionic surfactant in the detergent composition is 0.08 to 12, and the total content of the anionic surfactant and the alkali metal silicate and / or alkali metal hydroxide in the detergent composition is 65% by mass or more.

[0069] The mixing method specifically involves placing the components contained in the cleaning agent composition into a known mixer and mixing them to obtain a mixture (composition). This composition is usually in the form of a powder, granules, etc., and can further be made into tablets using a tablet press or the like. The shape and size of the tablets can be appropriately determined according to the ease of handling and application of the cleaning agent composition.

[0070] When the detergent composition of the present invention is dissolved in water to make a 2.4% by mass aqueous solution of the detergent, the pH of the aqueous solution (at 25°C) is preferably 11 or higher, more preferably 11.5 or higher, even more preferably 12 or higher, and particularly preferably 12.1 or higher. The method for measuring the pH of this 2.4% by mass aqueous solution of the detergent is as described in the examples.

[0071] (Average particle size of raw material components and detergent composition) The raw material components and detergent composition used in the present invention are solids and can take the form of, for example, powder, granules, or tablets. Powder is preferred. The smaller the average particle size of the powder, the faster the dissolution rate in water, and the larger the average particle size, the less powder is produced during use, making it easier to use. A fast dissolution rate in water makes it easier to avoid damage to the substrate caused by localized high concentrations due to undissolved components in the aqueous solution. In order to balance the viewpoint of fast dissolution rate in water and ease of handling by suppressing powder production, the average particle size of the raw material components and the detergent composition in powder form is usually 1 to 5000 μm, preferably 10 to 3000 μm, more preferably 20 to 2000 μm, and particularly preferably 100 to 1500 μm. This average particle size can be measured as follows.

[0072] Using 13 sieves and a tray with mesh sizes of 75μm, 106μm, 150μm, 250μm, 425μm, 600μm, 710μm, 850μm, 1000μm, 1180μm, 1400μm, 1700μm, and 2000μm, stack the sieves on the tray with the largest mesh sizes on top. Place the sample on top of the top sieve with a mesh size of 2000μm, support the stacked sieves with one hand, and tap the sieve frame at a rate of approximately 120 times per minute. Occasionally, place the sieve horizontally and tap the sieve frame firmly several times. Repeat this process to ensure thorough sieving. If the sample is clumped together due to static electricity or if fine powder is adhering to the inside or back of the sieve, gently loosen the sample with a brush, repeat the sieving process, and the material that passes through the sieve should be considered "below the sieve". "Below the sieve" refers to the test sample that has passed through the sieve by the end of the sieving process. If the sample contains particles with a diameter exceeding 2000 μm, additional sieves with mesh sizes of 2360 μm, 2800 μm, 3350 μm, 4000 μm, 4750 μm, 5600 μm, or larger may be added. If there are many particles with a diameter of 75 μm or less, additional sieves with mesh sizes of 63 μm, 53 μm, 45 μm, 38 μm, or smaller may be added.

[0073] The mass of the particles remaining on each sieve and tray is measured, and the mass percentage (%) of the particles on each sieve is calculated. The mass percentages of the particles on the sieves with smaller mesh sizes are added up sequentially, starting from the tray. Let the first sieve with a mesh size of aμm be aμm, the sieve with a mesh size one step larger than aμm be bμm, the mass percentage from the tray to the aμm sieve be c%, and the mass percentage on the aμm sieve be d%, then the average particle diameter can be calculated using the following formula 3.

[0074] TIFF2026069226000001.tif38170

[0075] The resulting solid detergent composition can be packaged in small containers such as films, pouches, or bottles. The container is not particularly limited as long as it can safely and stably store the detergent composition; for example, aluminum laminate film, aluminum pouches, or resin bottles can be used.

[0076] (Uses of detergent compositions) The cleaning agent composition of the present invention has a sufficient cleaning effect against dirt caused by the adhesion of oils and greases. In particular, it exhibits a sufficient cleaning effect on the object to be cleaned when oils and greases are firmly adhered or when a large amount of oils and greases are adhered. Because this cleaning agent composition has a high cleaning effect, it can be widely used to clean various objects. For example, it can efficiently and easily remove stubborn oil stains that occur around the kitchen, cooking utensils, tableware, range hoods, grease traps, etc. Examples of objects to be cleaned (substrates to which oils and greases have adhered) include range hood fans, sirocco fans, microwave oven trays, fish grills, trivets, pots, dishes, teapots, water bottles, lunch boxes, barbecue grills, grease trap bodies and utensils inside grease traps, etc. Furthermore, a wide range of materials can be used for the substrate material of the object to be cleaned, such as stainless steel (SUS304, etc.), aluminum, brass, galvanized steel, enamel, etc.

[0077] The cleaning method using the cleaning agent composition of the present invention can broadly employ a cleaning method in which an aqueous solution of the cleaning agent composition (hereinafter also referred to as "cleaning agent aqueous solution") comes into contact with the object to be cleaned. The cleaning agent aqueous solution can be prepared, for example, by dissolving the cleaning agent composition in water (preferably water at about 30-50°C, and more preferably water at about 35-45°C). When the cleaning agent composition of the present invention contains an oxygen-based oxidizing agent and a halogen-based oxidizing agent, it generates gas (oxygen gas) and foams when dissolved in water. In other words, it functions as a foaming agent. Because the cleaning agent composition can be quickly dissolved in water due to this foaming, the cleaning agent aqueous solution can be prepared more efficiently in a shorter time. Furthermore, when using a halogen-based oxidizing agent having a coating layer, even when water is added to the cleaning agent composition, the temperature rise of the mixture of the composition and water can be suppressed, thus providing high safety. In addition, because foaming reduces undissolved cleaning agent composition, the risk of substrate damage caused by contact between undissolved material and the substrate of the object to be cleaned can be reduced.

[0078] There are no particular limitations on the method of bringing the obtained cleaning solution into contact with the object to be cleaned. Typically, for example, this could involve preparing the cleaning solution in a container and immersing the object to be cleaned in this solution, or placing the object to be cleaned in a container and adding water and the cleaning composition or the cleaning solution to immerse it. In order to immerse the entire object to be cleaned in the cleaning solution, or to adjust the concentration of the cleaning solution to a desired range, water, the cleaning composition, or the cleaning solution may be added to the cleaning solution in which the object to be cleaned is immersed, as needed. In particular, it is preferable to completely dissolve the detergent composition in water to prepare a detergent aqueous solution with a uniform concentration, and then bring this aqueous solution into contact with the object to be cleaned. This reduces the risk of damage to the substrate of the object to be cleaned due to uneven concentration caused by undissolved detergent composition.

[0079] The concentration of the aqueous solution of the cleaning agent when the object to be cleaned comes into contact with (especially immersed in) the aqueous solution can be appropriately adjusted according to the degree of oil staining. From the viewpoint of achieving both a cleaning effect and preventing damage to the substrate, the concentration of the cleaning agent composition in the aqueous solution is usually 0.1 to 10% by mass, preferably 0.5 to 5% by mass, more preferably 1 to 4% by mass, and particularly preferably 1 to 2.5% by mass.

[0080] The immersion temperature (temperature of the aqueous solution) and immersion time in the cleaning agent aqueous solution are not particularly limited as long as the effects of the present invention can be achieved. From the viewpoint of high cleaning effect and suppression of damage or deterioration of the substrate, the immersion temperature (temperature of the aqueous solution) is, for example, about 5 to 50°C, preferably 10 to 45°C, and more preferably 20 to 40°C. The immersion time is, for example, 0.5 to 48 hours, preferably 1 to 24 hours, and more preferably 1 to 18 hours. After immersion as described above, the object to be cleaned (substrate) is removed, rinsed with water, and dried to obtain a cleaned substrate. [Examples]

[0081] The present invention will be specifically described below using examples and comparative examples, but the present invention is not limited to these. The raw materials and experimental equipment used in the examples and comparative examples are as follows. Among the raw materials, the average particle size of all raw materials for which the average particle size is not specified was within the range of 100 to 1000 μm.

[0082] [raw materials] <Halogenated oxidizing agents> Sodium dichloroisocyanurate coated with sodium benzoate, average particle size 712 μm • Sodium dichloroisocyanurate (product name "Neochlor 60MG", average particle size 339 μm, manufactured by Shikoku Chemicals Co., Ltd.) <Alkali metal silicates and / or alkali metal hydroxides> • Sodium metasilicate (anhydrous) granules (manufactured by Fujifilm Wako Pure Chemical Industries, Ltd.), average particle size 574 μm • Sodium metasilicate (anhydrous) powder (sieved from granules to remove small particles), average particle size 192 μm • Sodium hydroxide (manufactured by Fujifilm Wako Pure Chemical Industries, Ltd.) • Sodium metasilicate pentahydrate (manufactured by Fujifilm Wako Pure Chemical Industries, Ltd.), average particle size 963 μm <Alkaline compounds> • Sodium carbonate (manufactured by Fujifilm Wako Pure Chemical Industries, Ltd.) <Anionic surfactants> • Sodium lauryl sulfate (manufactured by Fujifilm Wako Pure Chemical Industries, Ltd.), average particle size 741 μm • Sodium linear alkynebenzenesulfonate (manufactured by Fujifilm Wako Pure Chemical Industries, Ltd.) <Nonionic surfactants> • Polyoxyethylene polyoxypropylene glycol (160 E.O.) (30 P.O.) (manufactured by Fujifilm Wako Pure Chemical Industries, Ltd.) <Oxygen-based oxidizing agents> • Sodium percarbonate (Hodogaya Chemical Co., Ltd. "PC-A") <Stabilizer> • Boron oxide (manufactured by Fujifilm Wako Pure Chemical Industries, Ltd.) <Other> • Cobalt naphthenate mineral spirit solution (Co: 5%) (manufactured by Fujifilm Wako Pure Chemical Industries; hereinafter sometimes referred to as cobalt naphthenate solution.) [Rotating Granulator] • AS ONE Corporation's "DPZ-1" [pH meter] • Horiba Manufacturing Co., Ltd.'s "F-51" [pH electrode] • Horiba, Ltd. "9615S-10D"

[0083] Example 1 The detergent composition was obtained by mixing each component in the proportions described in Example 1 of Table 1. The total proportion of anionic surfactant and alkali metal silicate and / or alkali metal hydroxide in the detergent composition, and the mass ratio of anionic surfactant to alkali metal silicate and / or alkali metal hydroxide ([alkali metal silicate and / or alkali metal hydroxide] / anionic surfactant) are as shown in Table 1.

[0084] Examples 2-31, Comparative Examples 1-12 Except for changing the type and content of each component, the detergent compositions of Examples 2 to 31 and Comparative Examples 1 to 12 were obtained in the same manner as in Example 1. The average particle sizes of the detergent compositions of Examples 1, 7, 17, and 31 were 740 μm, 619 μm, 653 μm, and 441 μm, respectively. The average particle sizes of the compositions of the other examples were in the range of 150 to 1000 μm.

[0085] The detergent compositions obtained in Examples 1-31 and Comparative Examples 1-12 were evaluated as follows.

[0086] (Measurement of stain removal rate) The dirt removal rate was measured as follows: (1) Creating oil stains on the model Soybean oil and cobalt naphthenate solution were mixed in a beaker in a mass ratio of 95:5 and stirred at room temperature for 120 minutes to obtain solution A. The weight (W1(g)) of SUS304 was measured. • Solution A was applied to SUS304 and heated on a hot plate at 200°C for 60 minutes to obtain an evaluation substrate. (2) Oil stain cleaning test The weight (W2(g)) of the evaluation board was measured. • 2.5g of the detergent composition was dissolved in 100ml of hot water (40℃) to obtain an aqueous solution of the detergent. The evaluation board was immersed in a cleaning solution and left undisturbed at room temperature (25°C) for 24 hours. After 24 hours, the evaluation board was removed, washed with water, and then dried in a 50°C dryer. The weight (W3(g)) of the evaluation substrate after drying was measured. The dirt removal rate was calculated using the following formula.

number

[0087] The stain removal rate was evaluated according to the following criteria. 65% or less: × (not allowed) Greater than 65% but 70% or less: △ (Acceptable) Greater than 70% but 80% or less: ○ (Good) Greater than 80% but less than or equal to 100%: ◎ (Excellent)

[0088] (Measurement of pH) The pH of the detergent aqueous solution was measured as follows: 2.5 g of each detergent composition from the examples and comparative examples was placed in a 500 ml beaker, 100 ml of distilled water and 0.5 ml of 10% defoaming agent (emulsion-type defoaming agent, product name "KM-89", manufactured by Shin-Etsu Silicone Co., Ltd.) were added, and the mixture was stirred at 25°C for 10 minutes. During stirring, the beaker was shaken vigorously periodically to ensure the defoaming agent was evenly distributed. After confirming that the foam had disappeared, a 2.4% by mass detergent aqueous solution was prepared. The pH (25°C) was measured using a pH meter. The pH meter was calibrated using pH 4 standard solution, pH 7 standard solution, and pH 9 standard solution immediately before measurement.

[0089] Furthermore, the detergent compositions obtained in Examples 8-12, 17, 19-23, 27-29, 31 and Comparative Examples 7-8 were evaluated as follows.

[0090] (dissolution time) The dissolution time was evaluated as follows: 100 ml of hot water (40°C) was added to a 200 ml beaker, and 2.5 g of the detergent composition was evenly added to it. Thereafter, the presence or absence of undissolved material was visually checked every hour, and the time when no undissolved material remained was defined as the dissolution time.

[0091] (Temperature change test) The change in water temperature after adding the detergent composition to water was measured as follows: 20g of the detergent composition was placed in a 50ml beaker, and a thermometer was placed in the center of the beaker. 10ml of water (25°C) was added near the thermometer, and the change in water temperature was observed for up to 30 minutes, and the highest temperature reached was measured.

[0092] These evaluation results are shown in Tables 1-4.

[0093] [Table 1]

[0094] [Table 2]

[0095] [Table 3]

[0096] [Table 4]

[0097] Tables 1-4 show that Examples 1-31 have a higher stain removal rate compared to Comparative Examples 1-12. A comparison of Examples 17 and 26 with Comparative Example 12 revealed that using anionic surfactants resulted in a higher stain removal rate. Furthermore, a comparison of Examples 17 and 25 with Comparative Example 9 revealed that using alkali metal silicates or alkali metal hydroxides as alkaline compounds resulted in a higher stain removal rate.

[0098] Table 4 shows that Examples 9-12, 17, 20-23, and 31, which contain both halogenated and oxygenated oxidizing agents (i.e., foaming agents), had shorter dissolution times for their detergent compositions compared to Examples 8, 19, and 27-29, which contain either a halogenated or oxygenated oxidizing agent (i.e., no foaming agent). This indicates that detergent compositions containing foaming agents allow for faster preparation of the detergent aqueous solution, effectively suppressing damage to the substrate of the object being cleaned. Furthermore, a comparison between Example 17 and Example 31 confirmed that Example 31, with its smaller average particle size, had a shorter dissolution time.

[0099] Table 4 shows that when comparing detergent compositions using the same amount of sodium percarbonate as the oxygen-based oxidizing agent, Examples 11-12, 17, and 22-23, which contain both an oxygen-based and a halogen-based oxidizing agent (i.e., a foaming agent), achieved lower maximum temperatures in the temperature change test compared to Examples 27-28, which contain an oxygen-based oxidizing agent but do not contain a halogen-based oxidizing agent.

[0100] Table 4 shows that when comparing detergent compositions using the same amount of sodium percarbonate as the oxygen-based oxidizing agent, Examples 9-12 and 17, which used sodium dichloroisocyanurate coated with a halogen-based oxidizing agent, achieved lower maximum temperatures in temperature change tests compared to Examples 20-23, which used uncoated sodium dichloroisocyanurate. Therefore, detergent compositions containing a foaming agent and a coated halogen-based oxidizing agent can be expected to offer higher safety even when a small amount of water is added to the detergent composition.

[0101] Example 32 (Substrate Damage Test) Damage or degradation tests were conducted on substrates made of various materials using the cleaning agent composition of Example 17. The test method is as follows. 100 ml of tap water (40°C) was placed in a 120 ml polypropylene container, and 2.5 g of the cleaning agent composition from Example 17 was added and stirred to dissolve, preparing a 2.4% by mass aqueous solution of the cleaning agent. Samples of the substrates to be evaluated (SUS304, aluminum, brass, zinc plating, enamel) (square plate-shaped samples measuring 4 cm x 4 cm) were immersed in this aqueous solution of the cleaning agent and left at room temperature (25°C) for 24 hours. After that, the substrates were removed and washed with tap water. The washed substrates were dried at 50°C for 60 minutes. The appearance of the dried substrates was visually observed to check for any damage. No significant damage was observed in any of the above substrates. [Industrial applicability]

[0102] The cleaning agent composition and cleaning method of the present invention are industrially useful because they have a sufficient cleaning effect, especially when oils and greases are firmly attached to the object to be cleaned, or when a large amount of oils and greases are attached.

Claims

1. A detergent composition containing an anionic surfactant and an alkali metal silicate and / or alkali metal hydroxide, wherein the mass ratio of alkali metal silicate and / or alkali metal hydroxide to the anionic surfactant in the detergent composition is 0.08 to 12, and the sum of the content of the anionic surfactant and the content of alkali metal silicate and / or alkali metal hydroxide in the detergent composition is 65% by mass or more.

2. The detergent composition according to claim 1, wherein the content of an anionic surfactant in the detergent composition is 8% by mass or more.

3. The detergent composition according to claim 1, wherein the anionic surfactant is one or more selected from the group consisting of fatty acid salts, alkyl sulfate salts, alkylbenzene sulfonates, olefin sulfonates, alkylnaphthalene sulfonates, dialkyl sulfosuccinates, alkyldiaryl ether sulfonates, alkyl phosphates, naphthalene sulfonic acid formalin condensates, aromatic sulfonic acid formalin condensates, polyoxyethylene alkyl ether sulfate salts, and alkyl sulfosuccinates.

4. The detergent composition according to claim 1, wherein the content of alkali metal silicate and / or alkali metal hydroxide in the detergent composition is 8% by mass or more.

5. The detergent composition according to claim 1, wherein the pH of a 2.4% by mass aqueous solution of the detergent composition is 11 or higher.

6. Furthermore, the cleaning agent composition according to claim 1 further contains an oxygen-based oxidizing agent and / or a halogen-based oxidizing agent.

7. Furthermore, the cleaning agent composition according to claim 1 further contains an oxygen-based oxidizing agent and a halogen-based oxidizing agent.

8. The cleaning agent composition according to claim 7, wherein the halogen-based oxidizing agent has a coating layer.

9. The detergent composition according to claim 1, which generates gas and bubbles when dissolved in water.

10. An aqueous solution of a detergent obtained by dissolving the detergent composition according to any one of claims 1 to 9 in water.

11. A method for producing the detergent composition according to claim 1, comprising: a method in which the mass ratio of alkali metal silicate and / or alkali metal hydroxide to an anionic surfactant in the detergent composition is 0.08 to 12, and a method in which the detergent composition is mixed such that the sum of the content of the anionic surfactant and the content of alkali metal silicate and / or alkali metal hydroxide in the detergent composition is 65% by mass or more.

12. A cleaning method comprising the step of bringing the cleaning agent aqueous solution described in claim 10 into contact with an object to be cleaned.

Images