Detergent composition and method for using detergent

Abstract

To provide a detergent composition capable of cleaning at a temperature lower than a conventional cleaning temperature (70-80 °C) and having a high cleaning effect.SOLUTION: The cleaning composition according to the present disclosure comprises component A: 0.1 to 6 mass% of an alkali metal hydroxide, component B: 0.1 to 5 mass% of an alkali metal hypochlorite, component C: 0.1 to 10 mass% of a silicate, component D: 0.01 to 1.0 mass% of a nonionic surfactant, component E: 0.1 to 10 mass% of a solubilizing agent, component F: 0.5 to 7 mass% of a polymeric dispersant or a phosphonate, and water.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to a cleaning agent composition that can be used for CIP cleaning of manufacturing facilities such as food factories. [Background technology]

[0002] Traditionally, CIP cleaning, in which a diluted solution of alkaline or acid detergent is heated to a high temperature of 70-80°C and circulated, has been used to clean manufacturing equipment such as tanks, sterilizers, and filling machines in food factories that produce dairy products and beverages. Recently, from the perspectives of reducing fuel costs, increasing environmental awareness, and improving safety during cleaning work, there has been a demand for the establishment of a cleaning method that can be performed at lower temperatures.

[0003] Alkaline detergents containing oxidizing agents such as sodium hypochlorite are effective cleaning agents. However, alkaline detergents that do not contain surfactants have insufficient cleaning performance when the cleaning temperature is lowered to around 40-50°C (i.e., at lower temperatures than conventional detergents). Furthermore, because sodium hypochlorite is a strong oxidizing agent, its stability tends to decrease significantly depending on the type of surfactant used.

[0004] Patent Documents 1 and 2 disclose detergent compositions that combine sodium hypochlorite and a low-foaming amphoteric surfactant. However, these compositions have poor cleaning performance against heavy soils such as milk fat found in dairy factories. Patent Document 3 also discloses a technology that enables cleaning at lower temperatures by using hydrogen peroxide in combination with an alkaline detergent containing a decomposition catalyst. However, this technology requires the use of two agents, making cleaning operations more complicated.

[0005] As described above, there is a demand for a cleaning agent for cleaning manufacturing equipment in food factories and the like, which has excellent cleaning effects even when used at temperatures lower than conventional cleaning temperatures. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Patent No. 5292140 [Patent Document 2] Japanese Patent Publication No. 2022-000485 [Patent Document 3] Patent No. 5893831 Summary of the Invention [Problem to be solved by the invention]

[0007] In view of the above circumstances, an object of the present disclosure is to provide a detergent composition that has a high cleaning effect even at temperatures lower than 70 to 80°C (conventional cleaning temperatures). [Means for solving the problem]

[0008] To solve the above problems, the present inventors worked to develop a detergent that has excellent cleaning properties and low foaming properties at temperatures lower than conventional cleaning temperatures (70 to 80°C), for example, at temperatures of 40 to 50°C. As a result of extensive investigation, they found that the problems could be solved by creating a detergent with the following composition and blending ratio, which led to the completion of the present invention.

[0009] The present disclosure includes the following aspects. [1] Component A: 0.5 to 6 mass% of an alkali metal hydroxide, Component B: 0.1 to 5 mass% of an alkali metal hypochlorite, Component C: 0.1 to 10 mass% of silicate, Component D: 0.01 to 1.0 mass% of a nonionic surfactant, Component E: 0.1 to 10% by mass of a solubilizer, Component F: 0.5 to 7 mass% of a polymer dispersant or a phosphonate; Water, including Cleaning composition. [2] Component A: 0.5 to 6 mass% of an alkali metal hydroxide, Component B: 0.1 to 5 mass% of an alkali metal hypochlorite, Component C: 0.1 to 10 mass% of silicate, Component D: 0.01 to 1.0 mass% of a nonionic surfactant, Component E: 0.1 to 10% by mass of a solubilizer, Component F: 0.5 to 7 mass% of a polymer dispersant or a phosphonate; Consisting only of water, Cleaning composition. [3] Component E includes an alkali metal salt of a fatty acid or an alkali metal salt of an aromatic sulfonic acid. The cleaning composition according to [1] or [2] above. [4] Component A is caustic soda or caustic potassium, The component B is sodium hypochlorite, The component C is potassium silicate, Component D is a polyoxyalkylene ether, Component E is sodium 2-ethylhexanoate, potassium 2-ethylhexanoate, or sodium m-xylene sulfonate; Component F is a polyacrylate or sodium 2-phosphono-1,2,4-butanetricarboxylate; The cleaning composition according to any one of the above [1] to [3]. [5] The cleaning composition according to any one of [1] to [4] above is diluted with water to a concentration of 0.1 to 50 mass %. Cleaning composition. [6] The cleaning composition according to the above [5] is heated to 20 to 60°C before use. How to use the cleaning agent. [7] Component A: 0.5 to 6 parts by mass of an alkali metal hydroxide, Component B: 0.1 to 5 parts by mass of an alkali metal hypochlorite, Component C: 0.1 to 10 parts by mass of silicate, Component D: 0.01 to 1.0 parts by mass of a nonionic surfactant, Component E: 0.1 to 10 parts by mass of a solubilizer, Component F: 0.5 to 7 parts by mass of a polymer dispersant or a phosphonate, water, The component A is 6% by mass or less of the total amount. Cleaning composition. [Effects of the Invention]

[0010] According to the present disclosure, it is possible to provide a detergent composition that has a high cleaning effect even at temperatures lower than 70 to 80°C (conventional cleaning temperatures). [Brief explanation of the drawings]

[0011] [Figure 1] 1 is a table showing the compounding ratios (mass %) and test results of Examples 1 to 6. [Figure 2] 1 is a table showing the compounding ratios (mass %) and test results of Examples 7 to 11. [Figure 3] 1 is a table showing the compounding ratios (mass %) and test results of Comparative Examples 1-6. DETAILED DESCRIPTION OF THE INVENTION

[0012] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The following describes embodiments of the present invention with reference to the accompanying drawings, but the present invention is not limited to the following embodiments.

[0013] In this specification, "CIP (Cleaning in Place)" refers to cleaning in place. Cleaning in place is a method of cleaning equipment in nearly the same condition as when it was in operation, without disassembling or moving it. The term "food" is a general term for food and drink that people consume on a daily basis.

[0014] [Cleaning composition] The present disclosure provides a cleaning composition suitable for CIP cleaning. The cleaning composition contains six components, Components A to F, and water. Component A is an alkali metal hydroxide, Component B is an alkali metal hypochlorite, Component C is a silicate, Component D is a nonionic surfactant, Component E is a solubilizer, and Component F is a polymeric dispersant or a phosphonate.

[0015] The cleaning composition of the present disclosure preferably contains 0.5 to 6 parts by mass of Component A: an alkali metal hydroxide, 0.1 to 5 parts by mass of Component B: an alkali metal hypochlorite, 0.1 to 10 parts by mass of Component C: a silicate, 0.01 to 1.0 part by mass of Component D: a nonionic surfactant, 0.1 to 10 parts by mass of Component E: a solubilizing agent, and 0.5 to 7 parts by mass of Component F: a polymeric dispersant or a phosphonate.

[0016] For example, the cleaning composition of the present disclosure may be a cleaning composition containing: Component A: 0.5 to 6 mass% of an alkali metal hydroxide; Component B: 0.1 to 5 mass% of an alkali metal hypochlorite; Component C: 0.1 to 10 mass% of a silicate; Component D: 0.01 to 1.0 mass% of a nonionic surfactant; Component E: 0.1 to 10 mass% of a solubilizing agent; Component F: 0.5 to 7 mass% of a polymeric dispersant or phosphonate; and water.

[0017] Details of each component are as follows: [Component A] Component A is an alkali metal hydroxide, such as caustic soda (sodium hydroxide) or caustic potassium (potassium hydroxide).

[0018] The content of component A (alkali metal hydroxide) is preferably 0.5 to 6 mass%, more preferably 1 to 5 mass%, and particularly preferably 2 to 4 mass%. When it is 0.5 mass% or more, cleaning properties are improved. When it is 6 mass% or less, the stability of component B (alkali metal hypochlorite) is improved, and corrosiveness to stainless steel can be suppressed. The content of component A is preferably 6% by mass or less of the total amount of the detergent composition.

[0019] [Component B] Component B is an alkali metal hypochlorite. Examples of alkali metal hypochlorite include sodium hypochlorite and potassium hypochlorite.

[0020] The content of Component B (alkali metal hypochlorite) is preferably 0.1 to 5 mass%, more preferably 1 to 4 mass%, and particularly preferably 2 to 3 mass%. When it is 0.1 mass% or more, cleaning properties are improved. When it is 5 mass% or less, corrosiveness to stainless steel can be suppressed.

[0021] [Component C] Component C is a silicate, such as potassium silicate or sodium silicate.

[0022] The content of component C: silicate is preferably 0.1 to 10 mass%, more preferably 0.5 to 8 mass%, and particularly preferably 1 to 4 mass%. When it is 0.1 mass% or more, corrosiveness to stainless steel can be suppressed. When it is 10 mass% or less, the occurrence of precipitation during low-temperature storage can be suppressed.

[0023] [Component D] Component D is a surfactant. The surfactant is preferably a nonionic surfactant. Examples of nonionic surfactants include, but are not limited to, polyoxyalkylene ethers, polyoxyethylene alkyl ethers, polyoxyalkylene alkyl ethers, polyoxyethylene alkenyl ethers, polyoxyalkylene alkylphenyl ethers, nonylphenoxy EO / PO polyalkylene glycol ethyl acetals, Pluronic block polymers, reverse Pluronic block polymers, sucrose fatty acid esters, sorbitan fatty acid esters, polyethylene glycol fatty acid esters, glycerin fatty acid esters, polyglycerin fatty acid esters, propylene glycol fatty acid esters, and fatty acid esters such as polypropylene glycol fatty acid esters. These nonionic surfactants may be used alone or in combination of two or more.

[0024] The content of Component D (nonionic surfactant) is preferably 0.01 to 1.0 mass%, more preferably 0.05 to 0.8 mass%, and particularly preferably 0.1 to 0.5 mass%. When it is 0.01 mass% or more, the cleaning ability is improved. When it is 1.0 mass% or less, the stability of Component B (alkali metal hypochlorite) is improved.

[0025] [Component E] Component E is a solubilizer. The solubilizer is not particularly limited as long as it can be used in food factories. It may be an alkali metal salt of a fatty acid or an alkali metal salt of an aromatic sulfonic acid. For example, it may be sodium 2-ethylhexanoate, potassium 2-ethylhexanoate, or sodium m-xylene sulfonate.

[0026] The content of Component E (solubilizer) is preferably 0.1 to 10% by mass, more preferably 0.5 to 8% by mass, and particularly preferably 1 to 5% by mass. When the content is 0.1% by mass or more, the liquid stability of the composition is improved. When the content is 10% by mass or less, the stability of Component B (alkali metal hypochlorite) is increased.

[0027] [Component F] Component F is a polymeric dispersant or a phosphonate. Examples of polymeric dispersants include polyacrylic acid or its alkali metal salt, a copolymer of acrylic acid and maleic acid or its alkali metal salt, a copolymer of styrene sulfonic acid and maleic acid or its alkali metal salt, and a copolymer of styrene sulfonic acid and acrylic acid or its alkali metal salt. Examples of phosphonates include 2-phosphonobutanetricarboxylic acid or its alkali metal salt, 1-hydroxyethylidene-1,1-diphosphonic acid or its alkali metal salt, and pentasodium aminotri(methylenephosphonate) or its alkali metal salt. Among these, sodium polyacrylate and sodium 2-phosphonobutanetricarboxylate are preferred in terms of the balance between detergency and the stability of the alkali metal hypochlorite (Component B).

[0028] The content of Component F: polymer dispersant or phosphonate is preferably 0.5 to 7 mass%, more preferably 0.8 to 5 mass%, and particularly preferably 1 to 3 mass%. When it is 0.5 mass% or more, the cleaning ability is improved. When it is 7 mass% or less, the stability of Component B, the alkali metal hypochlorite, is improved.

[0029] [water] The water contained in the detergent composition is water contained in each of the above components when the components are hydrates, or water added together with the components when the components are aqueous solutions, or water added separately. Examples of water include, but are not limited to, ion-exchanged water, soft water, pure water, and tap water.

[0030] [Other ingredients] Furthermore, other ingredients commonly used in the art may be added to the detergent composition as long as they do not impair the effects of the detergent composition, such as antifoaming agents, thickening agents, fragrances, colorants, pH adjusters, etc.

[0031] [Manufacturing method] The detergent composition can be obtained, for example, by measuring and mixing the components so that the components are: Component A: 0.5 to 6 parts by mass of an alkali metal hydroxide; Component B: 0.1 to 5 parts by mass of an alkali metal hypochlorite; Component C: 0.1 to 10 parts by mass of a silicate; Component D: 0.01 to 1.0 part by mass of a nonionic surfactant; Component E: 0.1 to 10 parts by mass of a solubilizing agent; and Component F: 0.5 to 7 parts by mass of a polymeric dispersant or a phosphonate; and then diluting with water to adjust the content of Component A to 6% by mass or less of the total amount.

[0032] [How to use] The detergent composition can be further diluted with water before use. The degree of dilution is not particularly limited and may be appropriately selected depending on the type and degree of soiling. For example, the detergent composition produced by the above-mentioned [Production Method] may be diluted with additional water to a concentration of 0.1 to 50 mass %. In other words, it can be diluted 2 to 1000 times before use. Alternatively, it may be diluted 5 to 500 times, or 20 to 100 times.

[0033] The cleaning composition may be used at room temperature (20°C) or heated before use. When heated, the temperature is preferably 20 to 80°C, more preferably 30 to 60°C, and particularly preferably 40 to 50°C. The temperature may be adjusted by diluting with hot water (warm water) to fall within the above temperature range. Alternatively, the cleaning composition may be diluted with water and then heated using a heater or the like to fall within the above temperature range.

[0034] As described above, the cleaning composition according to the present disclosure combines component B: an alkali metal hypochlorite with component D: a nonionic surfactant, thereby achieving both excellent cleaning properties and low foaming. Conventionally, it has not been possible to stably blend a nonionic surfactant into a cleaning agent containing an alkali metal hypochlorite. However, by adjusting the amount of alkaline agent and the type of solubilizer, it has been discovered that these components can coexist stably. To the applicant's knowledge, a one-component cleaning agent incorporating these two components is unprecedented.

[0035] Furthermore, the cleaning composition according to the present disclosure can be used at lower temperatures than conventional cleaning agents for cleaning the inside of manufacturing equipment used in dairy and food factories, etc., without disassembling the manufacturing equipment. Stainless steel, titanium, and the like are used as metal materials for such manufacturing equipment. The cleaning composition according to the present disclosure can be used without corroding these metal materials. [Example]

[0036] The present disclosure will be specifically described below with reference to examples and comparative examples. However, the present disclosure is not limited to the contents described in the following examples.

[0037] The reagents used in the examples and comparative examples are shown below. Component A: Alkali metal hydroxides, caustic soda (Pure content 48%, product name "48% liquid NaOH" manufactured by Toagosei Co., Ltd.) Component A: Alkali metal hydroxides, caustic potassium (Product name: "White Caustic Potash Flakes" manufactured by Nippon Soda Co., Ltd.) Ingredient B: Alkali metal hypochlorite, sodium hypochlorite (Product name: "Tsurukron N40" manufactured by Toagosei Co., Ltd.) Ingredient C: Silicate Potassium Silicate (40% pure, product name "A potassium silicate" manufactured by Nippon Chemical Industry Co., Ltd.) Component D: Surfactant 1: Nonionic surfactant, polyoxyalkylene alkyl ether (Product name: Lionol NH-1509, manufactured by Lion Specialty Chemicals Co., Ltd.) Component D: Surfactant 2: Nonionic surfactant, polyoxyalkylene ether (Product name: Adekanol B-2030, manufactured by ADEKA Corporation) Component D: Surfactant 3 Nonionic surfactant, nonylphenoxy EO / PO polyalkylene glycol ethyl acetal (Product name: Triton CF-76, manufactured by Dow Chemical Japan Co., Ltd.) Component D: Surfactant 4: Amphoteric surfactant, decyldimethylamine oxide (30% purity, product name "Genaminox K-10" manufactured by Clariant) Component E: Solubilizer 1 Sodium 2-ethylhexanoate (Product name: Octylic Acid, manufactured by KH Neochem Co., Ltd., neutralized with the calculated amount of caustic soda) Component E: Solubilizer 2, potassium 2-ethylhexanoate (Product name: "Octanoic acid" manufactured by KH Neochem Co., Ltd., neutralized by adding the calculated amount of caustic potassium) Component E: Solubilizer 3 Sodium m-xylene sulfonate (The reagent "m-xylene-4-sulfonic acid n-hydrate" manufactured by Kanto Chemical Co., Ltd. was neutralized by adding the calculated amount of caustic soda.) Component F: Polymer dispersant, polyacrylate (45% purity, product name "Frosperse 3000" manufactured by SNF Co., Ltd.) Component F: Phosphonate: Sodium 2-phosphono-1,2,4-butanetricarboxylate (50% pure water, product name "Crest Guard 414" manufactured by Crest Water LLC, neutralized with the calculated amount of caustic soda)

[0038] [Preparation of cleaning composition] For Examples 1 to 6, cleaning compositions were prepared based on the blending ratios shown in Table 1 of Figure 1. For Examples 7 to 11, cleaning compositions were prepared based on the blending ratios shown in Table 2 of Figure 2. For Comparative Examples 1 to 6, cleaning compositions were prepared based on the blending ratios shown in Table 3 of Figure 3.

[0039] <Chlorine concentration stability> 50 ml of each detergent composition was placed in a 50 ml polypropylene container and sealed. After storage at 40°C for one month, the available chlorine concentration (%) was measured by neutralization titration with a sodium thiosulfate solution, and the residual rate (%) was calculated using the following formula (1). Survival rate (%)= [Available chlorine concentration after storage (%) / Available chlorine concentration immediately after production (%)] x 100 (1) The remaining rate was evaluated according to the following criteria. 〇: More than 50% remained. △: 30% or more but less than 50% remained. ×: Less than 30% remained.

[0040] <Liquid stability (40℃)> 50 ml of each detergent composition was placed in a 50 ml polyethylene container and stored in an incubator set at 40°C for 30 days, after which the state of the detergent composition was visually observed. Storage stability was evaluated according to the following criteria. ○: No separation of components was observed. △: Slight separation was observed. ×: The components were completely separated.

[0041] <Liquid stability (-5℃)> 50 ml of each detergent composition was placed in a 50 ml polyethylene container and stored in an incubator set at -5°C for 30 days, after which the state of the detergent composition was visually observed. The storage stability was evaluated according to the following criteria. ○: No precipitate or freezing was observed. △: A slight amount of precipitate was formed. ×: Frozen.

[0042] <Cleanability (non-heated stains)> Fresh cream (trade name "Hokkaido Pure Fresh Cream 35" manufactured by Takanashi Dairy Co., Ltd.) was dropped onto a clean stainless steel piece (5cm x 10cm x 1mm, SUS304) in 9 spots of 25μL (total 225μL), and the piece was air-dried at room temperature for 24 hours to simulate unheated milk fat soiling. A 300 ml beaker was charged with 300 ml of a diluted solution of the detergent composition diluted with tap water to 2% by mass, and the mixture was heated to 45°C. The simulated soil was immersed in the diluted solution while being stirred with a magnetic stirrer, suspended by a clip. After 30 minutes, the simulated soil was rinsed with ion-exchanged water and air-dried at room temperature. The appearance was visually evaluated according to the following criteria. 〇: Almost completely removed. △: Some spots remained. ×: Spot marks and oil stains remained all over the surface.

[0043] <Cleanability (heat stains)> A 50 μL x 12 spots (600 μL in total) of a milk drink (product name "Wataboku Coffee 1000 ml" manufactured by Mori Dairy Co., Ltd.) was dropped onto a clean stainless steel piece (5 cm x 10 cm x 1 mm, SUS304) and dried at 135°C for 24 hours to simulate heated stains of a milk drink. A 300 ml beaker was charged with 300 ml of a diluted detergent solution of a detergent composition diluted to 10% by mass with tap water, and the solution was heated to 45°C. The simulated soil was immersed in the diluted detergent solution while being stirred with a magnetic stirrer, suspended by a clip. After 60 minutes, the simulated soil was rinsed with ion-exchanged water and air-dried at room temperature. The appearance was visually evaluated according to the following criteria. 〇: Almost completely removed. △: Some oil stains remained. ×: Burnt solid stains remained.

[0044] <Low foaming> Each detergent composition was diluted with tap water to a concentration of 2% by mass, and 30 ml of the diluted detergent solution was measured into a 100 ml stoppered measuring cylinder and placed in a warm bath at 45°C for 10 minutes. The stoppered measuring cylinder was then removed and shaken up and down 10 times. The foam volume (ml) was measured immediately after shaking and evaluated according to the following criteria. Good: The amount of foam was less than 10 ml. △: The amount of foam was 10 ml or more but less than 20 ml. ×: The amount of foam was 20 ml or more.

[0045] <Low corrosion resistance (SUS)> Each detergent composition was diluted with tap water to a concentration of 5% by mass, and 550 g of the diluted detergent solution was placed in a polyethylene container and heated to 75°C. A clean stainless steel piece (5 cm x 10 cm x 1 mm, SUS304) was then immersed in the diluted detergent solution for 72 hours. The appearance of the stainless steel piece after immersion was evaluated according to the following criteria. 〇: There was no discoloration. ×: Discoloration was observed.

[0046] Example 1 is a cleaning composition having the blending ratio of the present disclosure. Example 1 was evaluated as "good" in all of chlorine concentration stability, liquid stability, cleaning performance, low foaming property, and low corrosiveness. Example 2 is a cleaning composition having the same formulation as Example 1, except that a phosphonate was used instead of the polymer dispersant as Component F. As with Example 1, all evaluations were "Good." Example 3 is a cleaning composition in which the amount of component A (alkali metal hydroxide) is increased compared to Example 1. Example 4 is a cleaning composition different from Example 1 in the blending ratio of components other than Component F:polymer dispersant. Example 5 is a cleaning composition in which the amount of component A: caustic soda is reduced and the amount of component D: surfactant is increased compared to Example 1. Example 6 is a cleansing composition in which the amount of component D (surfactant) is reduced compared to Example 1. As with Example 1, all evaluations were "good." Example 7 is a cleansing composition in which, as component E: solubilizer, a different type of solubilizer was used from the solubilizer used in Example 1. As with Example 1, all evaluations were "Good." Example 8 is a cleaning composition in which the amount of component F (polymer dispersant) is reduced compared to Example 1. Example 9 is a cleaning composition in which the amount of component F: polymer dispersant is increased compared to Example 1. As with Example 1, all evaluations were "good." Example 10 is a cleansing composition in which a part of component D: surfactant in Example 1 was replaced with a different type of nonionic surfactant. As in Example 1, all evaluations were "good". Example 11 is a cleaning composition in which the amounts of component A: caustic soda and component B: sodium hypochlorite in Example 1 are reduced, all of component D: surfactant is replaced with a different type of nonionic surfactant, and the amount of component E: solubilizer is increased.

[0047] Comparative Example 1 is a cleaning composition that does not contain Component D: surfactant and Component E: solubilizer. Comparative Example 1 was insufficient in liquid stability at -5°C and in cleaning ability against unheated stains. Comparative Example 2 is a cleaning composition containing too much alkali metal hydroxide as component A. Comparative Example 2 had insufficient chlorine concentration stability. Comparative Example 3 is a cleaning composition that uses an amphoteric surfactant as Component D (surfactant) and does not contain a solubilizer as Component E. Comparative Example 3 was insufficient in terms of liquid stability at -5°C, cleaning performance for unheated stains, and low foaming properties. Comparative Example 4 is a detergent composition that does not contain silicate, Component C. Comparative Example 4 was insufficient in terms of cleaning performance against unheated stains and low corrosiveness against SUS. Comparative Example 5 is a cleaning composition that does not contain Component B: alkali metal hypochlorite. Comparative Example 5 was insufficient in liquid stability at -5°C and in cleaning ability against heated stains. Comparative Example 6 is a detergent composition that does not contain Component F: polymer dispersant or phosphonate. Comparative Example 6 had insufficient detergency for non-heated stains.

[0048] As described above, the cleaning composition according to the present disclosure has excellent chlorine concentration stability, excellent liquid stability at 40°C and -5°C, allowing for long-term storage, excellent cleaning properties at lower temperatures than conventional cleaning compositions, low foaming properties that allow for easy rinsing, and low corrosiveness to SUS, which is widely used in manufacturing equipment at food factories.

Claims

1. Component A: 0.5 to 6 mass% of an alkali metal hydroxide, Component B: 0.1 to 5 mass% of an alkali metal hypochlorite, Component C: 0.1 to 10% by mass of silicate, Component D: 0.01 to 1.0 mass% of a nonionic surfactant, Component E: 0.1 to 10% by mass of a solubilizer, Component F: 0.5 to 7% by mass of a polymer dispersant or a phosphonate; Water, including Cleaning composition.

2. Component A: 0.5 to 6 mass% of an alkali metal hydroxide, Component B: 0.1 to 5 mass% of an alkali metal hypochlorite, Component C: 0.1 to 10% by mass of silicate, Component D: 0.01 to 1.0 mass% of a nonionic surfactant, Component E: 0.1 to 10% by mass of a solubilizer, Component F: 0.5 to 7% by mass of a polymer dispersant or a phosphonate; Consisting only of water, Cleaning composition.

3. Component E comprises an alkali metal salt of a fatty acid or an alkali metal salt of an aromatic sulfonic acid. The cleaning composition according to claim 1 or 2.

4. Component A is caustic soda or caustic potassium, The component B is sodium hypochlorite, Component C is potassium silicate, Component D is a polyoxyalkylene ether, Component E is sodium 2-ethylhexanoate, potassium 2-ethylhexanoate, or sodium m-xylene sulfonate; Component F is a polyacrylate or sodium 2-phosphono-1,2,4-butanetricarboxylate; The cleaning composition according to claim 1 or 2.

5. The cleaning composition according to claim 1 or claim 2 is diluted with water to a concentration of 0.1 to 50% by mass. Cleaning composition.

6. The cleaning composition according to claim 3 is heated to 20 to 60°C before use. How to use the cleaning agent.

7. Component A: 0.5 to 6 parts by mass of an alkali metal hydroxide, Component B: 0.1 to 5 parts by mass of an alkali metal hypochlorite, Component C: 0.1 to 10 parts by mass of silicate, Component D: 0.01 to 1.0 parts by mass of a nonionic surfactant, Component E: 0.1 to 10 parts by mass of a solubilizer, Component F: 0.5 to 7 parts by mass of a polymer dispersant or a phosphonate, water, The content of the component A is 6% by mass or less of the total amount. Cleaning composition.

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