Detergent composition

Abstract

To provide a cleaning agent composition that can remove stubborn rain stains without causing loss of gloss to the object being cleaned. [Solution] A detergent composition containing components (A) to (C) and having a pH of less than 3.0. (A) Ingredients: Water (B) Component: Organic acid (C) Components: One or more surfactants selected from the group consisting of the compound of formula (1) below, sodium dodecylbenzenesulfonate, and hydroxyethylimidazolinium betaine. JPEG2026113420000007.jpg1161 R in equation (1) 1 R is a hydrocarbon group having 1 to 3 carbon atoms. 2 is a hydrocarbon group with 20 or more carbon atoms, and n is an integer between 2 and 40.

Description

[Technical Field]

[0001] This invention relates to a detergent composition. [Background technology]

[0002] Rainwater containing various impurities remains on the painted surface of vehicles, forming water stains known as ion deposits or water spots. To remove water stains that are difficult to remove with general car washing, emulsion-type cleaning agents containing an organic solvent, an alkaline compound, an abrasive, and a dispersant are known (see Patent Document 1). In addition, as a household cleaning agent, a water-wiping cleaning agent composition containing a surfactant, an organic acid and / or organic acid salt, and water, with a pH of 3.0 to 8.0, is known (see Patent Document 2). [Prior art documents] [Patent Documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2009-242698 [Patent Document 2] Japanese Patent Publication No. 2013-245230 [Overview of the project] [Problems that the invention aims to solve]

[0004] Conventional technologies, due to the inclusion of abrasives, cause microscopic scratches on the painted surface, resulting in a loss of the vehicle's original gloss. Furthermore, household cleaning agents have difficulty removing stubborn rain stains formed outdoors. [Means for solving the problem]

[0005] As a result of diligent research to achieve the above objective, the inventors discovered a method that can remove stubborn rain stains without causing loss of gloss to the object being cleaned, and thus completed the present invention.

[0006] The gist of this invention is described below. [1] A detergent composition containing components (A) to (C) and having a pH of less than 3.0. (A) Ingredients: Water (B) Component: Organic acid (C) Components: One or more surfactants selected from the group consisting of the compound of formula (1) below, sodium dodecylbenzenesulfonate, and hydroxyethylimidazolinium betaine. [ka] (R 1 R is a hydrocarbon group having 1 to 3 carbon atoms. 2 (where n is an integer between 2 and 40, and n is a hydrocarbon group with 20 or more carbon atoms.)

[0007] [2] The detergent composition according to [1], wherein component (B) is lactic acid and / or citric acid.

[0008] [3] A detergent composition according to either [1] or [2], comprising 0.01 to 3.0 parts by mass of component (B) per 10 parts by mass of component (A).

[0009] [4] A detergent composition according to either [1] or [2], comprising 0.001 to 2.0 parts by mass of component (C) per 10 parts by mass of component (A).

[0010] [5] A cleaning agent composition according to either item [1] or [2], used on the painted surface of a coating agent.

[0011] [6] A cleaning agent composition according to either item [1] or [2], used on a painted surface of a coating agent mainly composed of polysilazane.

[0012] [7] A cleaning agent composition according to either item [1] or [2], used on the painted surface of a vehicle body coating agent.

[0013] A method for cleaning rain stains by applying the detergent composition according to any one of [8][1] or [2] to the rain stains adhering to the painted surface of the coating agent.

Advantages of the Invention

[0014] The detergent composition of the present invention enables the removal of strong rain stains without losing the gloss of the painted surface of a vehicle or the like.

Embodiments for Carrying Out the Invention

[0015] The details of the present invention will be described below. The component (A) that can be used in the present invention is water, and it is used as a medium for dissolving or dispersing the component (B) and the component (C) described later. The component (A) has little risk of eroding the object to be cleaned and reducing the gloss, and does not have an adverse impact on the environment even when used outdoors. As the component (A), pure water such as ion-exchanged water or distilled water from which metal components have been removed can be used.

[0016] The component (B) that can be used in the present invention is an organic acid. By including the component (B), it can act effectively on stains such as rain stains and remove the stains. The component (B) is preferably a substance with high safety to the human body in consideration of the environment. Specific examples include acetic acid, propionic acid, citric acid, tartaric acid, gluconic acid, fumaric acid, malic acid, lactic acid, succinic acid, adipic acid, etc. Among these, citric acid and / or lactic acid are preferable in terms of low odor, handleability, and excellent cleaning ability for rain stains. The component (B) is preferably contained in an amount of 0.01 to 3.0 parts by mass, more preferably 0.05 to 2.0 parts by mass, and most preferably 0.1 to 1.0 parts by mass with respect to 10 parts by mass of the component (A). Being in the range of 0.01 to 3.0 parts by mass provides excellent detergency without losing the gloss of the object to be cleaned. These may be used alone or in combination of two or more.

[0017] As the component (C) that can be used in the present invention, it is a surfactant selected from the group consisting of a compound of the following formula (1), sodium dodecylbenzenesulfonate, and hydroxyethylimidazolinium betaine. JPEG2026113420000002.jpg1161(R 1 is a hydrocarbon group having 1 to 3 carbon atoms, and R 2 is a hydrocarbon group having 20 or more carbon atoms, and n is an integer of 2 to 40.)

[0018] By using the component (C), the gloss of the object to be washed can be kept good even after removing the rain stain. Also, by using it in combination with the component (B), more excellent detergency can be exhibited. R in the formula (1) 1 is a hydrocarbon group having 1 to 3 carbon atoms, and R 2 is a hydrocarbon group having 20 or more carbon atoms, and n is an integer of 2 to 40. The hydrocarbon group consists only of carbon and hydrogen and does not contain atoms such as oxygen and nitrogen. Since R 2 is a hydrocarbon group having 20 or more carbon atoms, it does not reduce the gloss on the object to be washed. The compound of the formula (1) can be synthesized, for example, from a higher alcohol having 20 or more carbon atoms and an alkylene oxide. Examples of the higher alcohol having 20 or more carbon atoms include, but are not limited to, arachidyl alcohol, octyldodecanol, decyltetradecanol, etc. Also, R 1 is a hydrocarbon group having 1 to 3 carbon atoms, n is an integer of 2 to 40, and has a polyoxyalkylene structure. Having a polyoxyalkylene structure is a factor that does not reduce the gloss of the object to be washed even after removing the rain stain. Among the component (C), particularly the chemical formula 1 and hydroxyethylimidazolinium betaine are preferable from the viewpoint of excellent detergency without losing the gloss of the object to be washed. From the viewpoint of good detergency, n in the chemical formula 1 is preferably 7 or more, and more preferably 15 or more. Also, from the same viewpoint, n is preferably 30 or less. Also, R 1 is preferably a hydrocarbon group having 2 carbon atoms from the viewpoint of good detergency.

[0019] The aforementioned component (C) is preferably present in an amount of 0.001 to 2.0 parts by mass, more preferably 0.005 to 1.5 parts by mass, and most preferably 0.01 to 1.3 parts by mass, per 10 parts by mass of component (A). Being in the range of 0.001 to 2.0 parts by mass ensures excellent cleaning performance without causing loss of gloss to the object being cleaned. These may be used alone or in combination of two or more. From the viewpoint of exhibiting even better cleaning performance, the amount of component (C) is preferably 10 to 600 parts by mass, preferably 15 to 500 parts by mass, and most preferably 20 to 400 parts by mass, per 100 parts by mass of component (B).

[0020] The cleaning agent composition of the present invention has a pH of less than 3.0. A pH of less than 3.0 allows for excellent cleaning performance against stubborn rain stains. Methods for adjusting the pH are not particularly limited and include adding an acid other than component (B) to the cleaning agent composition of this embodiment, or adjusting the amount of component (B) contained in the cleaning agent composition. The lower limit is not particularly limited but is 0 or greater. pH can be measured by known methods, such as using a pH meter.

[0021] The cleaning agent composition of the present invention preferably does not contain fillers. The presence of fillers may cause scratches on the cleaning agent during spreading or wiping, leading to loss of gloss. "Not containing" here means 0.5% by mass or less, more preferably 0.1% by mass or less, and most preferably 0% by mass (not containing) of the entire cleaning agent composition. Examples of fillers include inorganic fillers and organic fillers, but it is particularly preferable that the composition does not contain inorganic fillers. Examples of inorganic fillers include silica powder and alumina powder.

[0022] Within limits that do not impair the properties of the present invention, appropriate amounts of additives such as solvents, surfactants other than component (C), antioxidants, polymerization inhibitors, defoamers, leveling agents, and rheology control agents may be added, or may not be added. Adding these additives yields a composition or cured product with excellent workability and storage stability.

[0023] Examples of the aforementioned solvents include alcohols, ketone compounds, ester compounds, carbonate compounds, and polyether compounds (excluding component (C)). However, because the solvent may inhibit the compatibility of components (B) and (C) with component (A), and may reduce the gloss of the object to be cleaned, the solvent content is less than 5% by mass, and more preferably less than 1% by mass.

[0024] Other surfactants besides component (C) include anionic surfactants having -SO3Na and -SO3NH4 in their molecules, nonionic surfactants that do not contain ions in their molecules, cationic surfactants containing quaternary ammonium salts in their molecules, and amphoteric surfactants that contain both anions and cations in their molecules. However, since this may reduce the effect of component (C) of the present invention, the amount of other surfactants is preferably 30% by mass or less, more preferably 10% by mass or less, and most preferably 0% by mass (not contained), based on 100% by mass of component (C).

[0025] The cleaning agent composition according to the present invention is used for articles exposed to outdoor environments, and is particularly suitable for use as a cleaning agent composition for vehicles such as automobiles. Vehicles such as automobiles are often coated with coating agents for stain resistance and improved appearance, and coating agents applied to vehicle bodies are known as body coating agents. Examples of coating agents mainly include coating agents with silicone as the main component and coating agents with polysilazane as the main component. The cleaning agent composition according to the present invention exhibits particularly excellent cleaning properties against rain stains on coating agents with polysilazane as the main component, and even after removing rain stains, it can reproduce the excellent gloss that the coating surface had initially without reducing the gloss it had.

[0026] When applying the cleaning agent composition according to the present invention to an object to be cleaned, methods such as impregnating a sponge or cloth with the cleaning agent composition and rubbing the painted surface can be used. Other application methods, such as brush application or aerosol spraying, can also be appropriately selected depending on the purpose and application. [Examples]

[0027] The present invention will now be described in more detail with reference to examples, but the present invention is not limited to these examples. (Hereinafter, the detergent composition will also be simply referred to as the composition.)

[0028] [Examples 1-10, Comparative Examples 1-35] The following components were prepared to create the composition. (A) Ingredients: Water (a-1) Pure water (reagent) (B) Component: Organic acid (b-1) Citric acid (Product name: Citric acid monohydrate, manufactured by Wako Pure Chemical Industries, Ltd.) (b-2) 88% by weight lactic acid aqueous solution (product name: Fermented Lactic Acid 88% (PURAC HS88), manufactured by Corbion Japan Co., Ltd.) (C) Components: One or more surfactants selected from the group consisting of the compound of formula (1) below, sodium dodecylbenzenesulfonate, and hydroxyethylimidazolinium betaine. JPEG2026113420000003.jpg1161(R 1 R is a hydrocarbon group having 1 to 3 carbon atoms. 2 (where n is an integer between 2 and 40, and n is a hydrocarbon group with 20 or more carbon atoms.) (c-1) Sodium dodecylbenzenesulfonate (Product name: Neoperex G-15, Active ingredient content: 16% by mass, manufactured by Kao Corporation) (c-2) Polyoxyethylene octyldodecyl ether (Oxyethylene group count: 20, Active ingredient content: 100% by mass, Product name: Emulgen 2020G-HA, Manufactured by Kao Corporation) (c-3) Polyoxyethylene octyldodecyl ether (Oxyethylene group count: 25, Active ingredient content: 100% by mass, Product name: Emulgen 2025G, Manufactured by Kao Corporation) (c-4) Hydroxyethylimidazolinium betaine (Product name: Anhitoll 20Y-B, ​​Active ingredient content: 40% by mass, manufactured by Kao Corporation) (C') component: Comparative component of (C) component (c'-1) Benzalkonium chloride (Product name: Sanizol C, Active ingredient content: 50% by mass, manufactured by Kao Corporation) (c'-2) Polyoxyethylene lauryl ether (Oxyethylene group count: 2, Active ingredient content: 100% by mass, Product name: Emulgen 102KG, Manufactured by Kao Corporation) (c'-3) Polyoxyethylene lauryl ether (Oxyethylene group count: 4, Active ingredient content: 100% by mass, Product name: Emulgen 105, Manufactured by Kao Corporation) (c'-4) Polyoxyethylene alkyl ether (Oxyethylene group count: 5, Active ingredient content: 100% by mass, Alkyl group: 11-15 carbon atoms, Product name: Emulgen 705, Manufactured by Kao Corporation) (c'-5) Polyoxyethylene oleyl ether (Oxyethylene group count: 6, Active ingredient content: 100% by mass, Product name: Emulgen 408, Manufactured by Kao Corporation) (c'-6) Polyoxyethylene hydrogenated castor oil ester (oxyethylene group count: 25, active ingredient content: 100% by mass, product name: Emanon CH-25, manufactured by Kao Corporation)

[0029] Examples 1-10 and Comparative Examples 1-35 were prepared. For each composition, components (A), (B), and (C) (or (C')) were weighed into a beaker and stirred for 10 minutes. Detailed preparation amounts are shown in Tables 1 and 2, and all values ​​are expressed in parts by mass. The pH of each composition was measured using a pH meter manufactured by Horiba, Ltd. and is also listed in Tables 1 and 2. However, for compositions where liquid separation occurred, an accurate value could not be measured, so it is indicated as "-".

[0030] [Table 1]

[0031] [Table 2]

[0032] Appearance tests, removeability tests, and water repellency tests were performed on Examples 1-10 and Comparative Examples 1-35. The results are shown in Tables 1 and 2.

[0033] [Visual inspection] 50g of the detergent compositions from Examples 1-10 and Comparative Examples 1-35 were placed in 100mL vials, sealed, shaken by hand 30 times, and the state of the liquid was visually inspected after standing for 5 minutes. The evaluation criteria were as follows. • Evaluation criteria ○: The liquid is uniform and not separated. ×: Separation of the liquid has occurred.

[0034] [Method for preparing test specimens] Approximately 2 ml of the glass-based coating agent T-Fine (manufactured by ThreeBond Co., Ltd., main component: polysiloxane) was soaked into a tissue paper and thinly spread onto a black painted plate (material: SPCC-SD, standard: JIS-G-3141, dimensions: 0.8 mm x 70 mm x 150 mm, with one side coated with amino alkyd black paint after chemical electrodeposition, product of Asahi B-Techno Co., Ltd.). After standing for 30 seconds in a room at 25°C and 55% RH, the excess was wiped off with a dry microfiber cloth, and the plate was left to cure for one week in an environment at 25°C and 55% RH to prepare a test specimen.

[0035] [Removability Test] Tap water was sprayed onto the surface of the horizontally positioned test specimen, and while maintaining the horizontal position to prevent water droplets from falling, it was left in a 50°C hot air drying oven for 3 hours to allow rain stains to form. It was then left for another hour in a 25°C environment. After that, approximately 2 ml of each composition was soaked into tissue paper and spread thinly over the entire rain-stained surface. After standing for 60 seconds in a 25°C environment, the excess was wiped off with a dry microfiber cloth, and it was dried for 5 minutes in a 25°C environment. The evaluation criteria were as follows. However, for compositions in which liquid separation occurred in the visual test, an accurate value could not be measured, so it was indicated as "-". In addition, the removeability test was conducted using tap water instead of the compositions, but the evaluation result was ×. • Evaluation criteria ○: No rain stains remain on any surface of the test specimen upon visual inspection. △: Water stains remain on a portion of the test specimen upon visual inspection. ×: Rain stains remain on all surfaces of the test specimen upon visual inspection.

[0036] [Water repellency test] When one drop (approximately 0.005 ml) of pure water was dropped onto the surface of a test piece coated with the aforementioned glass-based coating agent using a dropper, and the contact angle of the water with respect to the substrate surface was measured using a contact angle meter (DM-500, Kyowa Interface Science Co., Ltd.), the contact angle was 101° (contact angle before cleaning). The more mirror-like (higher glossy) the test piece, the higher the contact angle. The contact angle was similarly measured for the test piece after the removal test (contact angle after cleaning). The difference between the contact angle before cleaning and the contact angle after cleaning was defined as the contact angle difference as an indicator of water repellency (contact angle difference = contact angle after cleaning - contact angle before cleaning). The desirable contact angle difference for the cleaning agent composition of the present invention is a value of less than 9.0°, and more preferably a value of less than 6.0°. The lower the contact angle difference, the higher the water repellency maintained and the less the initial gloss is lost. However, for compositions in which liquid separation occurred in the appearance test, an accurate value could not be measured, so it is indicated as "-".

[0037] Examples 1-10 demonstrate excellent removal properties, and the cleaned surface exhibits high water repellency. Comparative Examples 1-2, lacking component (C), resulted in inferior water repellency of the cleaned surface. Comparative Examples 3-29 used a comparative component instead of component (C) of the present invention, but either separation occurred in the composition, or even without separation, the removal properties or water repellency of the cleaned surface were inferior. Comparative Examples 30-35 used R of chemical formula (1) instead of component (C) of the present invention. 2 Although it uses surfactants that are not hydrocarbon groups, the result was poor in terms of removal ability or water repellency of the surface being cleaned. [Industrial applicability]

[0038] The cleaning agent composition of the present invention can remove rain stains without reducing the original gloss of the surface to be cleaned, making it highly useful for a wide range of cleaning applications.

Claims

1. A detergent composition containing components (A) to (C) and having a pH of less than 3.

0. (A) Ingredients: Water (B) Component: Organic acid (C) Component: One or more surfactants selected from the group consisting of the compound of formula (1) below, sodium dodecylbenzenesulfonate, and hydroxyethylimidazolinium betaine. 【Chemistry 1】 (R １ R is a hydrocarbon group having 1 to 3 carbon atoms. ２ (where n is a hydrocarbon group with 20 or more carbon atoms, and n is an integer between 2 and 40.)

2. The detergent composition according to claim 1, wherein component (B) is lactic acid and / or citric acid.

3. The detergent composition according to any one of claims 1 or 2, comprising 0.01 to 3.0 parts by mass of component (B) per 10 parts by mass of component (A).

4. The detergent composition according to claim 1 or 2, wherein component (C) is contained in an amount of 0.001 to 2.0 parts by mass per 10 parts by mass of component (A).

5. A cleaning agent composition according to claim 1 or 2, used on the painted surface of a coating agent.

6. A cleaning agent composition according to claim 1 or 2, for use on a painted surface of a coating agent mainly composed of polysilazane.

7. A cleaning agent composition according to claim 1 or 2, used for use on the painted surface of a vehicle body coating agent.

8. A method for cleaning rain stains by applying the cleaning agent composition according to claim 1 or 2 to rain stains adhering to the painted surface of a coating agent.

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