JP2024060365A - Cleaning agent for hard surfaces and method for cleaning hard surfaces - Google Patents

Abstract

[Problem] To provide a hard surface cleaner and a method for cleaning hard surfaces that have excellent cleaning and foam suppression properties even when the object to be cleaned is cleaned by mechanical cleaning. [Solution] A hard surface cleaner is used that contains a compound (1) having a cloud point of 60° C. or higher and represented by the following general formula (1), and a compound (2) having a cloud point of 40° C. or lower and represented by the following general formula (2). [Chemical formula 1] TIFF2024060365000011.tif32170 [Selected figure] None

Description

The present invention relates to a cleaning agent for hard surfaces and a method for cleaning hard surfaces.

For example, in cosmetics manufacturing plants, cleaning of various filling line parts is often performed by workers by hand, which requires time and manpower. To solve this problem, it is expected that machine cleaning using machine cleaners such as washer-disinfectors will become more widespread, and there is a demand for the development of cleaners suitable for machine cleaning. Specifically, there is a demand for cleaners that have both sufficient cleaning properties and the ability to suppress excessive foaming (foam suppression). If excessive foaming cannot be suppressed, problems such as a decrease in cleaning power due to a drop in water pressure, a stop in the cleaning process or a breakdown of the cleaner due to the liquid delivery pump running idly, and problems due to foam overflowing from the cleaner can occur.

For example, Patent Document 1 discloses a metal cleaning agent composition containing a polyoxyethylene alkyl ether with low hydrophilicity, a polyoxyethylene alkyl ether with high hydrophilicity, a polyoxyethylene alkyl amine, a glycol ether and/or an alcohol, and water.
Patent Document 2 discloses an alkaline cleaning solution for resin parts, which comprises a polyoxyethylene alkyl ether type nonionic surfactant (HLB 9 to 11), a coconut alkylamine ethylene oxide adduct type nonionic surfactant, at least one selected from potassium pyrophosphate, dipotassium phosphate, and monopotassium phosphate, and water.
Patent Document 3 reports a liquid detergent composition containing a polyoxyalkylene alkyl ether and/or a fatty acid polyoxyethylene alkyl ether, a long-chain aliphatic alkylamine and/or a long-chain aliphatic amido alkylamine, and a polyoxyalkylene alkylamine.

Japanese Patent Application Laid-Open No. 08-239785 Japanese Patent Application Laid-Open No. 05-039499 JP 2010-209316 A

However, the cleaning agents described in Patent Documents 1 to 3 do not necessarily have sufficient cleaning properties and foam-suppressing properties in machine cleaning, and there is room for improvement.
An object of the present invention is to provide a cleaning agent for hard surfaces and a cleaning method for hard surfaces that have excellent cleaning properties and foam-suppressing properties even when the object to be cleaned is cleaned by mechanical cleaning.

The present invention has the following aspects.
[1] A hard surface cleaning agent comprising: a compound (1) having a cloud point of 60° C. or higher and represented by the following general formula (1); and a compound (2) having a cloud point of 40° C. or lower and represented by the following general formula (2):

In formula (1), R ¹ is a linear or branched alkyl group having 6 to 24 carbon atoms, or a linear or branched alkenyl group having 6 to 24 carbon atoms; A ¹ O and A ² O are each independently an alkyleneoxy group having 2 to 4 carbon atoms; p represents the average number of repetitions of A ¹ O and is a number from 1 to 100; and q represents the average number of repetitions of A ² O and is a number from 1 to 100.
However, when p is greater than 1, the multiple A ¹ Os may be the same as or different from each other, and when q is greater than 1, the multiple A ² Os may be the same as or different from each other.

In formula (2), R ² is a linear or branched, saturated or unsaturated hydrocarbon group having 6 to 22 carbon atoms, which may contain one or more bonds selected from the group consisting of an ether bond, an ester bond, and an amide bond, A ³ O is an alkyleneoxy group having 2 to 4 carbon atoms, and m indicates the average number of repetitions of A ³ O and is a number from 1 to 200. However, when m is 1, A ³ O is an ethyleneoxy group. When m is more than 1, the multiple A ³ O may be the same or different from each other. R ³ is a linear or branched alkyl group having 1 to 18 carbon atoms, or a linear or branched alkenyl group having 2 to 18 carbon atoms.

[2] The hard surface cleaning agent according to [1], further comprising an anionic surfactant.
[3] A method for cleaning a hard surface, comprising cleaning the hard surface with the hard surface cleaner according to [1] or [2] above.

The present invention provides a cleaning agent for hard surfaces and a cleaning method for hard surfaces that have excellent cleaning and foam suppression properties, even when the object to be cleaned is cleaned by mechanical cleaning.

The present invention will be described in detail below.
The term "cloud point" is defined in JIS K 3211 "Terminology of surfactants" as "the temperature at which an aqueous surfactant solution begins to become cloudy when the temperature is increased. Usually, the solution becomes cloudy and phase separation occurs.
"The cloud point" can be measured by the following method.
A 1% by mass aqueous solution of the measurement sample is poured into a test tube to a height of about 40 mm, a thermometer is placed inside, and the solution is heated while stirring thoroughly with the thermometer to a temperature about 2 to 3°C higher than the temperature at which clouding occurs, and then air-cooled again while stirring thoroughly. The temperature at which the solution becomes transparent is taken as the cloud point.
If the solution is cloudy at room temperature (20°C), cool it with thorough stirring until it becomes transparent, then gradually heat it again with thorough stirring to the temperature at which the solution becomes cloudy, then gradually cool it with stirring, and measure the temperature at which the solution becomes transparent; this value is the cloud point.

[Hard surface cleaner]
The hard surface cleaner of the present invention is a composition containing the following components (A) and (B).
It is preferable that the hard surface cleaner further contains the following component (C).
The hard surface cleaner may further comprise water.
The hard surface cleaner may further contain components (optional components) other than the components (A), (B), (C) and water, as necessary.

<Component (A)>
The component (A) is a compound (1) having a cloud point of 60° C. or higher and represented by the following general formula (1).

In formula (1), R ¹ is a linear or branched alkyl group having 6 to 24 carbon atoms, or a linear or branched alkenyl group having 6 to 24 carbon atoms; A ¹ O and A ² O are each independently an alkyleneoxy group having 2 to 4 carbon atoms; p represents the average number of repetitions of A ¹ O and is a number from 1 to 100; and q represents the average number of repetitions of A ² O and is a number from 1 to 100.
However, when p is greater than 1, the multiple A ¹ Os may be the same as or different from each other, and when q is greater than 1, the multiple A ² Os may be the same as or different from each other.

In formula (1), R ¹ is a linear or branched alkyl group having 6 to 24 carbon atoms, or a linear or branched alkenyl group having 6 to 24 carbon atoms.
The number of carbon atoms in the alkyl group and the alkenyl group in ^R1 is 6 to 24, preferably 8 to 24, more preferably 8 to 18, and even more preferably 8 to 16. When the number of carbon atoms in the alkyl group and the alkenyl group is equal to or greater than the lower limit, the cleaning property is improved. In addition, when the hard surface cleaner is an aqueous solution containing water, the transparency of the aqueous solution can be well maintained. When the number of carbon atoms in the alkyl group and the alkenyl group is equal to or less than the upper limit, the foam suppressing property is improved.
The alkyl group and alkenyl group in ^R1 may each be linear or branched, but is preferably linear.
R ¹ is most preferably a linear alkyl or alkenyl group having 8 to 16 carbon atoms.

In formula (1), A ¹ O and A ² O each independently represent an alkyleneoxy group having 2 to 4 carbon atoms, that is, an ethyleneoxy group (EO), a propyleneoxy group (PO) or a butyleneoxy group (BO).
A ¹ O and A ² O are preferably an ethyleneoxy group (EO) and a propyleneoxy group (PO), respectively.
When p is greater than 1, multiple A ¹ O may be the same or different.
When A ¹ O is different, for example, when EO and PO are mixed, the distribution (arrangement order) of EO and PO is not particularly limited, and they may be arranged in a block form or randomly.
When q is greater than 1, multiple A ² O may be the same or different.
When A ² O is different, for example, when EO and PO are mixed, the distribution (arrangement order) of EO and PO is not particularly limited, and they may be arranged in a block form or randomly.
A ¹ O and A ² O may be the same or different, but are preferably the same, and it is more preferable that A ¹ O and A ² O are EO.

In formula (1), p represents the average number of repetitions of A ¹ O (average number of moles added) and is a number from 1 to 100, preferably from 1 to 50, and more preferably from 1 to 20.
In formula (1), q represents the average number of repetitions of A ² O (average number of moles added) and is a number from 1 to 100, preferably from 1 to 50, and more preferably from 1 to 20.
The sum of p and q is preferably 2-200, more preferably 2-100, and even more preferably 2-40.

From the viewpoint of further enhancing the foam-suppressing property, the compound (1) is preferably a compound in which, in formula (1), R ¹ is a linear or branched alkyl group having 8 to 24 carbon atoms, or a linear or branched alkenyl group having 8 to 24 carbon atoms, and p and q are each numbers of 1 to 100; more preferably a compound in which R ¹ is a linear or branched alkyl group having 8 to 18 carbon atoms, or a linear or branched alkenyl group having 8 to 18 carbon atoms, and p and q are each numbers of 1 to 50; even more preferably a compound in which R ¹ is a linear or branched alkyl group having 8 to 18 carbon atoms, or a linear or branched alkenyl group having 8 to 18 carbon atoms, and p and q are each numbers of 1 to 20; and particularly preferably a compound in which R ¹ is a linear or branched alkyl group having 8 to 16 carbon atoms, or a linear or branched alkenyl group having 8 to 16 carbon atoms, and p and q are each numbers of 1 to 20. In these compounds, when p is greater than 1, multiple A ¹ O may be the same as or different from each other. When q is greater than 1, multiple A ² O may be the same as or different from each other.
The compound (1) may be used alone or in combination of two or more kinds in any desired ratio.

The cloud point of compound (1) is 60° C. or higher, preferably 65° C. or higher, more preferably 70° C. or higher, even more preferably 75° C. or higher, and particularly preferably 80° C. or higher. When the cloud point of compound (1) is the above lower limit or higher, the compound has excellent cleaning properties.
The upper limit of the cloud point of the compound (1) is not particularly limited, but is usually 100° C. or lower.

The content of compound (1) is preferably 0.1 to 30% by mass, more preferably 1 to 20% by mass, and even more preferably 1 to 10% by mass, based on the total mass of the hard surface cleaner. If the content of compound (1) is equal to or greater than the above lower limit, the cleaning properties are improved. If the content of compound (1) is equal to or less than the above upper limit, the foam suppression properties are improved.

<Component (B)>
The component (B) is a compound (2) having a cloud point of 40° C. or lower and represented by the following general formula (2).

In formula (2), R ² is a linear or branched, saturated or unsaturated hydrocarbon group having 6 to 22 carbon atoms, which may contain one or more bonds selected from the group consisting of an ether bond, an ester bond, and an amide bond, A ³ O is an alkyleneoxy group having 2 to 4 carbon atoms, and m indicates the average number of repetitions of A ³ O and is a number from 1 to 200. However, when m is 1, A ³ O is an ethyleneoxy group. When m is more than 1, the multiple A ³ O may be the same or different from each other. R ³ is a linear or branched alkyl group having 1 to 18 carbon atoms, or a linear or branched alkenyl group having 2 to 18 carbon atoms.

In formula (2), ^R2 is a linear or branched, saturated or unsaturated hydrocarbon group having 6 to 22 carbon atoms.
The number of carbon atoms in the hydrocarbon group in ^R2 is 6 to 22, preferably 8 to 22, and more preferably 8 to 18. When the number of carbon atoms in the hydrocarbon group is equal to or greater than the above lower limit, favorable foam-suppressing properties are obtained. When the number of carbon atoms in the hydrocarbon group is equal to or less than the above upper limit, the foam-suppressing properties are improved. In addition, when the hard surface cleaner is an aqueous solution containing water, the transparency of the aqueous solution can be well maintained.
The hydrocarbon group in ^R2 may contain one or more bonds selected from the group consisting of an ether bond, an ester bond, and an amide bond, i.e., one or more of any methylene groups ( _-CH2- ) contained in the hydrocarbon group may be replaced by an ether bond, an ester bond, or an amide bond (excluding cases where oxygen atoms are bonded adjacent to each other).
Examples of the hydrocarbon group in ^R2 include an alkyl group, an alkenyl group, a phenyl group, a benzyl group, etc. Among these, an alkyl group and an alkenyl group are preferred.

In formula (2), A ³ O is an alkyleneoxy group having 2 to 4 carbon atoms, that is, an ethyleneoxy group (EO), a propyleneoxy group (PO) or a butyleneoxy group (BO).
When m is 1, A ³ O is EO.
When m is greater than 1, all A ³ O may be the same or different from each other.
When A ³ O is different, for example, when EO and PO are mixed, the distribution (arrangement order) of EO and PO is not particularly limited, and they may be arranged in a block form or randomly.

In formula (2), R ³ is a linear or branched alkyl group having 1 to 18 carbon atoms, or a linear or branched alkenyl group having 2 to 18 carbon atoms, preferably a linear or branched alkyl group having 1 to 12 carbon atoms, or a linear or branched alkenyl group having 2 to 12 carbon atoms, more preferably a linear or branched alkyl group having 1 to 10 carbon atoms, or a linear or branched alkenyl group having 2 to 10 carbon atoms, and even more preferably a linear or branched alkyl group having 1 to 6 carbon atoms, or a linear or branched alkenyl group having 2 to 6 carbon atoms.
When the content is in the above preferred range, the cleaning properties and anti-foaming properties are enhanced in a well-balanced manner.

In formula (2), m represents the average number of repetitions of A ³ O (average number of moles added) and is a number from 1 to 200, preferably from 1 to 100, and more preferably from 1 to 40.

As the compound (2), from the viewpoint of improving transparency, cleaning properties, and foam suppression in a well-balanced manner, a compound in which, in formula (2), R ² is a linear alkyl or alkenyl group having 8 to 22 carbon atoms, m is 1 to 200, and R ³ is a linear or branched alkyl group having 1 to 12 carbon atoms, or a linear or branched alkenyl group having 2 to 12 carbon atoms, is preferred; a compound in which R ² is a linear alkyl or alkenyl group having 8 to 18 carbon atoms, m is 1 to 200, and R ³ is a linear or branched alkyl group having 1 to 10 carbon atoms, or a linear or branched alkenyl group having 2 to 10 carbon atoms, is more preferred; and a compound in which R ² is a linear alkyl or alkenyl group having 8 to 18 carbon atoms, m is 1 to 200, and R ³ is a linear or branched alkyl group having 1 to 6 carbon atoms, or a linear or branched alkenyl group having 2 to 6 carbon atoms, is even more preferred. In these compounds, when m is 1, A ³ O is EO. When m is greater than 1, multiple A ³ O may be the same or different.
The compound (2) may be used alone or in combination of two or more kinds in any desired ratio.

The cloud point of the compound (2) is not more than 40° C., preferably not more than 35° C., and more preferably not more than 30° C. When the cloud point of the compound (2) is not more than the above upper limit, the compound has excellent foam-suppressing properties.
The lower limit of the cloud point of the compound (2) is not particularly limited, but for example, the cloud point of the compound (2) is preferably 0° C. or higher, more preferably 3° C. or higher, and even more preferably 5° C. or higher. When the cloud point of the compound (2) is the above-mentioned lower limit or higher, the foam suppression property is improved. In addition, when the hard surface cleaner is an aqueous solution containing water, the transparency of the aqueous solution can be better maintained.

The content of compound (2) is preferably 1 to 50 mass %, more preferably 5 to 40 mass %, and even more preferably 10 to 35 mass %, based on the total mass of the hard surface cleaner. When the content of compound (2) is equal to or greater than the above lower limit, the foam suppression properties are further improved. When the content of compound (2) is equal to or less than the above upper limit, a better balance of transparency, cleaning properties, and foam suppression properties can be maintained.

In the hard surface cleaner of this embodiment, the content ratio (B/A) of the total content of the (B) component to the total content of the (A) component is preferably 0.1 to 20, more preferably 0.2 to 10, even more preferably 0.3 to 8, and particularly preferably 0.4 to 5, based on mass.
When the content is equal to or more than the lower limit of the above range, the cleaning properties are further improved, and when the content is equal to or less than the upper limit of the above range, the foam suppressing properties are further improved.

<Component (C)>
The component (C) is an anionic surfactant.
If the hard surface cleaner contains component (C), the cleaning properties are further improved. In addition, when the hard surface cleaner is in a liquid state, the cleaner has excellent transparency.
The hydrophilic group contained in the anionic surfactant is not particularly limited, but examples thereof include a carboxy group, a sulfate group, a sulfonic acid group, and a phosphate group.
The hydrophobic group contained in the anionic surfactant is not particularly limited, but examples thereof include alkyl groups, alkenyl groups, and aryl groups such as benzyl groups.
The alkyl group, alkenyl group and aryl group in the hydrophobic group each preferably have 6 to 18 carbon atoms, and more preferably 6 to 12 carbon atoms.
The alkyl group and alkenyl group in the hydrophobic group may each be linear or branched, but is preferably linear.
The alkyl group and the alkenyl group in the hydrophobic group may each be saturated or unsaturated, but are preferably saturated.
The aryl group such as a benzyl group in the hydrophobic group may or may not have an alkyl group. When the aryl group such as a benzyl group has an alkyl group, the number of carbon atoms in the alkyl group is preferably 6 to 14, and more preferably 6 to 12.

As the anionic surfactant, from the viewpoint of further improving the cleaning properties, a compound having a carboxy group, a sulfate group, a sulfonic acid group, or a phosphate group as a hydrophilic group, and a linear or branched alkyl group having 6 to 18 carbon atoms, a linear or branched alkenyl group having 6 to 18 carbon atoms, or a benzyl group which may have an alkyl group having 6 to 14 carbon atoms as a hydrophobic group is preferred, a compound having a carboxy group, a sulfate group, a sulfonic acid group, or a phosphate group as a hydrophilic group, and a linear or branched alkyl group having 6 to 12 carbon atoms, a linear or branched alkenyl group having 6 to 12 carbon atoms, or a benzyl group which may have an alkyl group having 6 to 14 carbon atoms as a hydrophobic group is more preferred, and a compound having a carboxy group or a sulfate group as a hydrophilic group, and a linear or branched alkyl group having 6 to 12 carbon atoms, or a linear or branched alkenyl group having 6 to 12 carbon atoms as a hydrophobic group is even more preferred.

Examples of anionic surfactants having a carboxy group as a hydrophilic group include sodium octanoate, sodium decanoate, sodium laurate, sodium myristate, sodium palmitate, and sodium stearate.
Examples of anionic surfactants having a sulfate ester group as a hydrophilic group include sodium ethylhexyl sulfate, sodium lauryl sulfate, sodium myristyl sulfate, and sodium laureth sulfate.
Examples of anionic surfactants having a sulfonic acid group as a hydrophilic group include sodium linear alkylbenzenesulfonate having 6 to 18 carbon atoms, sodium alkanesulfonate having 6 to 18 carbon atoms, and the like.
Examples of anionic surfactants having a phosphate ester group as a hydrophilic group include lauryl phosphate and sodium lauryl phosphate.
The anionic surfactants may be used alone or in combination of two or more kinds in any desired ratio.

The content of the anionic surfactant is preferably 0.1 to 20 mass %, more preferably 0.1 to 10 mass %, and even more preferably 0.1 to 5 mass %, based on the total mass of the hard surface cleaner. When the content of the anionic surfactant is equal to or more than the lower limit, the cleaning properties are further improved.
When the content of the anionic surfactant is equal to or less than the above upper limit, the foam suppressing property is improved.

<Water>
The water is not particularly limited, and examples thereof include tap water, deionized water (ion-exchanged water), pure water, ultrapure water, distilled water, etc. Among these, deionized water, pure water, ultrapure water, and distilled water are preferred from the viewpoint of being less affected by impurities, etc.
The water may be used alone or in combination of two or more kinds in any desired ratio.

The water content is preferably 10 to 98.8% by mass, more preferably 20 to 93.9% by mass, and even more preferably 45 to 88.9% by mass, based on the total mass of the hard surface cleaner. If the water content is within the above range, transparency, uniformity, and cost-effectiveness can be better maintained.

<Optional ingredients>
The optional components are not particularly limited as long as they are known additives that are blended into cleaning agents. From the viewpoint of further improving cleaning properties and foam suppression properties, alkaline agents, chelating agents, organic solvents, etc. are preferred.

Examples of the alkaline agent include alkali metal hydroxides such as sodium hydroxide and potassium hydroxide, silicate compounds such as sodium silicate, amine compounds such as alkanolamines, etc. Among these, from the viewpoint of further improving the cleaning properties, alkali metal hydroxides and amine compounds are preferred, and sodium hydroxide, potassium hydroxide, and alkanolamines having 1 to 9 carbon atoms are more preferred.
The alkaline agents may be used alone or in combination of two or more kinds in any desired ratio.

The content of the alkaline agent is preferably 0.1 to 20% by mass, and more preferably 0.1 to 15% by mass, based on the total mass of the hard surface cleaner. If the content of the alkaline agent is within the above range, the cleaning properties will be further improved.

Examples of the chelating agent include aminocarboxylic acids and salts thereof such as ethylenediaminetetraacetate, phosphonic acids and salts thereof such as hydroxyethanediphosphonic acid, polycarboxylic acids and salts thereof such as polyacrylic acid, oxycarboxylic acids and salts thereof such as citric acid, etc. Among these, from the viewpoint of further improving the cleaning properties, aminocarboxylic acids and salts thereof, phosphonic acids and salts thereof, and polycarboxylic acids and salts thereof are preferred, and ethylenediaminetetraacetic acid and salts thereof, diethylenetriaminepentaacetic acid and salts thereof, hydroxyethylethylenediaminetriacetic acid and salts thereof, hydroxyethane-1,1-diphosphonic acid and salts thereof, and polyacrylic acid having a weight average molecular weight of 8000 and salts thereof are more preferred.
The chelating agents may be used alone or in combination of two or more kinds in any desired ratio.

The content of the chelating agent is preferably 0.1 to 15% by mass, more preferably 0.1 to 10% by mass, and even more preferably 0.1 to 5% by mass, based on the total mass of the hard surface cleaner. If the content of the chelating agent is within the above range, the cleaning properties will be further improved.

Examples of the organic solvent include linear or branched higher alcohols having 6 to 24 carbon atoms, linear or branched hydrocarbons having 6 to 24 carbon atoms, glycol ethers having 6 to 24 carbon atoms, and nitrogen-containing organic solvents such as methylpyrrolidone. Among these, from the viewpoint of further improving the foam-suppressing property and transparency, linear or branched higher alcohols having 8 to 20 carbon atoms and linear or branched hydrocarbons having 8 to 20 carbon atoms are preferred, and branched higher alcohols having 8 to 16 carbon atoms and branched hydrocarbons having 8 to 16 carbon atoms are more preferred.
The organic solvents may be used alone or in combination of two or more kinds in any desired ratio.

The content of the organic solvent is preferably 0.1 to 15% by mass, more preferably 0.1 to 10% by mass, and even more preferably 0.1 to 5% by mass, based on the total mass of the hard surface cleaner. When the content of the organic solvent is within the above range, the foam suppression property is further improved. In addition, the transparency of the diluted solution obtained by diluting the hard surface cleaner with water or the like is excellent.
The total content of the components (A), (B), (C), water and optional components contained in the hard surface cleaner does not exceed 100% by mass based on the total mass of the hard surface cleaner.

In addition to the above, optional components may include, for example, fatty acids and their salts, stabilizers, surfactants other than the components (A), (B), and (C), water-miscible organic solvents other than the organic solvents, thickeners, viscosity reducers, solubilizers, chelating agents other than the chelating agents, antioxidants, preservatives, enzymes, fragrances, colorants, emulsifiers, natural products, pH adjusters, antifoaming agents, storage stability improvers, fluorescent agents, pearlescent agents, and the like.

<Production Method>
The hard surface cleaner can be obtained by mixing the components (A) and (B) with, if necessary, the component (C), water, and one or more optional components.

<Form>
The form of the hard surface cleaner is not particularly limited, and may be a solid or liquid. From the viewpoint of ease of supply to a cleaner and prevention of insoluble residue, the hard surface cleaner is preferably in liquid form. The liquid hard surface cleaner may contain dispersed particles. In this specification, the liquid hard surface cleaner is also referred to as a "liquid hard surface cleaner" or a "liquid hard surface cleaner composition".

<How to use>
A hard surface cleaner is a cleaner for hard surfaces.
The hard surface cleaner may be used for cleaning hard surfaces as it is without diluting with water or the like, or the hard surface cleaner may be diluted with water before use. In this specification, the diluted solution obtained by diluting the hard surface cleaner with water is also referred to as the "cleaning solution".

The cleaning liquid is an aqueous solution containing a hard surface cleaner, i.e., the cleaning liquid is an aqueous solution containing the above-mentioned component (A), component (B), water, and, as necessary, component (C) and one or more optional components.
The content of component (A) in the cleaning solution, i.e., compound (1), is preferably 0.0001 to 3 mass %, more preferably 0.001 to 2 mass %, and even more preferably 0.001 to 1 mass %, based on the total mass of the dilution solution. When the content of component (A) is within the above range, the cleaning properties and foam suppressing properties are improved.
The content of the component (B) in the cleaning solution, i.e., the compound (2), is preferably 0.001 to 5 mass %, more preferably 0.005 to 4 mass %, and even more preferably 0.01 to 3 mass %, based on the total mass of the dilution solution. When the content of the component (B) is within the above range, the cleaning properties and foam suppressing properties are improved.
The content of the component (C) in the cleaning solution, i.e., the anionic surfactant, is preferably 0.0001 to 2.5% by mass, more preferably 0.0001 to 2.0% by mass, and even more preferably 0.0001 to 1.5% by mass, based on the total mass of the diluted solution. If the content of the component (C) is within the above range, the cleaning properties and foam suppressing properties are improved.
The water content in the cleaning solution is preferably 89.5 to 99.9988% by mass, more preferably 92 to 99.9899% by mass, and even more preferably 94.5 to 99.97% by mass, based on the total mass of the diluted solution. If the water content is within the above range, a better balance between cleaning properties and foam suppression properties can be maintained.

How to clean hard surfaces
The method for cleaning a hard surface is a method for cleaning a hard surface using the above-mentioned hard surface cleaner, and specifically, the above-mentioned hard surface cleaner or cleaning liquid is brought into contact with dirt adhering to the hard surface to remove the dirt.
The hard surface may be, for example, the surface of a part (hard part) formed of a hard material, specifically, the surface of a medical instrument, a tool for producing cosmetics (for example, a filling line part, etc.), or the like.
Examples of hard materials include metals, resins, glass, ceramics, etc. When the object to be cleaned is a medical instrument, a cosmetic production instrument, etc., the hard material is preferably a metal or a resin.
The metal is not particularly limited, but examples include iron, copper, stainless steel, and the like.
The resin is not particularly limited, but examples thereof include polytetrafluoroethylene, polyacetal, polyvinyl chloride, and polycarbonate.
The hard surface cleaner of the present invention may also be used to clean soft surfaces such as silicone rubber, ethylene propylene diene rubber, etc.

The dirt to be cleaned is not particularly limited, but examples thereof include oil-soluble dirt, water-soluble dirt, solid dirt, and a combination of these dirt.
Examples of oil-soluble stains include stains caused by animal and vegetable oils and fats, mineral oils, and the like.
Examples of water-soluble stains include stains caused by water-soluble inorganic salts such as salt, sugar, and sweat, and stains caused by water-soluble organic compounds.
Examples of solid soils include dirt, iron, carbon, and soils caused by insoluble salts such as magnesium stearate.
Examples of complex soils include cosmetic soils, pharmaceutical soils, food soils, and the like.
Examples of cosmetic stains include oil-soluble stains from foundation, lip balm, sunscreen (sunscreen cream), and the like.
Examples of pharmaceutical stains include oil-soluble stains such as ointments and health oils, and solid stains such as tablets.
Examples of food stains include oil-soluble stains such as mayonnaise and chocolate.

The cleaning method is not particularly limited as long as the cleaning agent or cleaning liquid for hard surfaces is brought into contact with the surface of a hard part to which dirt has adhered, and examples thereof include a method of immersing the object to be cleaned in a liquid cleaning agent or cleaning liquid for hard surfaces; a method of spraying a liquid cleaning agent or cleaning liquid for hard surfaces onto the object to be cleaned; and a method of mechanically cleaning the object to be cleaned using a mechanical cleaner such as a washer-disinfector into which a liquid cleaning agent or cleaning liquid for hard surfaces has been poured. The cleaning agent for hard surfaces of the present invention is particularly suitable for a method of mechanically cleaning the object to be cleaned using a mechanical cleaner such as a washer-disinfector.

The cleaning temperature, i.e., the temperature of the hard surface cleaner or cleaning solution, is not particularly limited and is determined appropriately during cleaning, but from the viewpoint of further improving cleaning properties, a temperature of 50 to 90°C is preferable, and 60 to 90°C is more preferable.

<Action and effect>
The hard surface cleaner of the present invention described above contains the compound (1) as the component (A) and the compound (2) as the component (B), and therefore has excellent cleaning and foam-suppressing properties even when the object to be cleaned is cleaned by mechanical cleaning using a mechanical cleaner such as a washer-disinfector. Furthermore, if the liquid cleaner for hard surfaces contains the component (C), in addition to the cleaning and foam-suppressing properties, it has excellent transparency, good visibility during use, and better usability.

The present invention will now be described in more detail with reference to examples, but the following examples are not intended to limit the scope of the present invention.
The raw materials and the various measurement and evaluation methods used in the examples and comparative examples are as follows.

[Ingredients used]
The compounds shown below were used as component (A) and comparative products.
A-1: Polyoxyethylene (6, the number indicates the average repeating number of alkyleneoxy groups.
The same applies below.) Ethylhexylamine (manufactured by Aoki Oil Industries Co., Ltd., trade name "Brownon EH-6", a compound (1) in which, in the general formula (1), R ¹ is a branched alkyl group having 8 carbon atoms (ethylhexyl group), A ¹ O and A ² O are ethyleneoxy groups, and p+q is 6, having a cloud point of more than 80° C. and not more than 100° C.).
A-2: Polyoxyethylene (10) laurylamine (compound (1) in which, in the general formula (1), R ¹ is a lauryl group, A ¹ O and A ² O are ethyleneoxy groups, and p+q is 10; cloud point is more than 80° C. and not more than 100° C.; synthesized by the synthesis method described below).
A-3: Polyoxyethylene (20) stearylamine (compound (1) in which, in the general formula (1), R ¹ is a stearyl group, A ¹ O and A ² O are ethyleneoxy groups, and p+q is 20; cloud point is more than 80° C. and not more than 100° C.; synthesized by the synthesis method described below).
A-4: Polyoxypropylene (6) polyoxyethylene (10) laurylamine (compound (1) in which, in the general formula (1), R ¹ is a lauryl group, A ¹ O and A ² O are an ethyleneoxy group and a propyleneoxy group, p+q is 16, and the total of the ethyleneoxy groups is 10 and the total of the propyleneoxy groups is 6; cloud point 61° C.; synthesized by the synthesis method described below).
A-5: Polyoxyethylene (30) stearylamine (compound (1) in which, in the general formula (1), R ¹ is a stearyl group, A ¹ O and A ² O are ethyleneoxy groups, and p+q is 30; cloud point is more than 80° C. and not more than 100° C.; synthesized by the synthesis method described below).
A-6: Polyoxyethylene (50) stearylamine (compound (1) in which, in the general formula (1), R ¹ is a stearyl group, A ¹ O and A ² O are ethyleneoxy groups, and p+q is 50; cloud point is more than 80° C. and not more than 100° C.; synthesized by the synthesis method described below).
A-r1: polyoxyethylene (5) laurylamine (a compound represented by the general formula (1) above, in which R ¹ is a lauryl group, A ¹ O and A ² O are ethyleneoxy groups, and p+q is 4; cloud point: 59° C.; synthesized by the synthesis method described below).
A-r2: polyoxypropylene (4) polyoxyethylene (6) laurylamine (a compound represented by the general formula (1) above, in which R ¹ is a lauryl group, A ¹ O and A ² O are an ethyleneoxy group and a propyleneoxy group, p+q is 10, and the total number of ethyleneoxy groups is 6 and the total number of propyleneoxy groups is 4; cloud point is 0° C. or higher and lower than 20° C.; synthesized by the synthesis method described below).

(Synthesis of A-2)
Laurylamine was charged into the autoclave, and the inside of the vessel was replaced with nitrogen. Next, the supply of ethylene oxide was started at a temperature of 120°C or higher. At this time, the reaction was carried out at a reaction temperature of 155 to 165°C and a pressure of 0.5 MPa·G or less. After 2 molar equivalents of ethylene oxide were supplied per molar equivalent of laurylamine, the mixture was aged until the internal pressure became constant. Next, potassium hydroxide was charged into the autoclave as a catalyst, and the mixture was substituted with nitrogen, and then the temperature was raised to 120°C and a dehydration treatment was carried out under reduced pressure for 1 hour. Then, the supply of ethylene oxide was started at a temperature of 140°C or higher. At this time, the reaction was carried out at a reaction temperature of 160 to 170°C and a pressure of 0.5 MPa·G or less. After 8 molar equivalents of ethylene oxide were supplied per molar equivalent of laurylamine, the mixture was aged until the internal pressure became constant, and A-2 was obtained.

(Synthesis of A-3)
Stearylamine was charged into an autoclave, and the inside of the vessel was substituted with nitrogen. Next, the supply of ethylene oxide was started at a temperature of 120°C or higher. At this time, the reaction was carried out at a reaction temperature of 155 to 165°C and a pressure of 0.5 MPa·G or lower. After 2 molar equivalents of ethylene oxide were supplied per molar equivalent of stearylamine, the mixture was aged until the internal pressure became constant. Next, sodium hydroxide was charged into the autoclave as a catalyst, the mixture was substituted with nitrogen, and the temperature was raised to 120°C or higher, and the supply of ethylene oxide was started. At this time, the reaction was carried out at a reaction temperature of 155 to 165°C and a pressure of 0.5 MPa·G or lower. After 18 molar equivalents of ethylene oxide were supplied per molar equivalent of stearylamine, the mixture was aged until the internal pressure became constant, and A-3 was obtained.

(Synthesis of A-4)
Laurylamine was charged into the autoclave, and the inside of the vessel was replaced with nitrogen. Next, the supply of ethylene oxide was started at a temperature of 120°C or higher. At this time, the reaction was carried out at a reaction temperature of 155 to 165°C and a pressure of 0.5 MPa·G or less. After 2 molar equivalents of ethylene oxide were supplied per molar equivalent of laurylamine, the mixture was aged until the internal pressure became constant. Next, potassium hydroxide was charged into the autoclave as a catalyst, and the mixture was substituted with nitrogen, and then the temperature was raised to 120°C and a reduced pressure dehydration treatment was carried out for 1 hour. Then, the supply of propylene oxide was started at a temperature of 120°C or higher. At this time, the reaction was carried out at a reaction temperature of 120 to 130°C and a pressure of 0.5 MPa·G or less. After 6 molar equivalents of propylene oxide were supplied per molar equivalent of laurylamine, the mixture was aged until the internal pressure became constant. Next, the supply of ethylene oxide was started at a temperature of 130°C or higher. At this time, the reaction was carried out at a reaction temperature of 135 to 145°C and a pressure of 0.5 MPa·G or less. After feeding 8 molar equivalents of ethylene oxide per molar equivalent of laurylamine, the mixture was aged until the internal pressure became constant, to obtain A-4.

(Synthesis of A-5)
Stearylamine was charged into the autoclave, and the inside of the vessel was substituted with nitrogen. Next, the supply of ethylene oxide was started at a temperature of 120°C or higher. At this time, the reaction was carried out at a reaction temperature of 155 to 165°C and a pressure of 0.5 MPa·G or lower. After supplying 2 molar equivalents of ethylene oxide per molar equivalent of stearylamine, the mixture was aged until the internal pressure became constant. Next, sodium hydroxide was charged into the autoclave as a catalyst, and the mixture was substituted with nitrogen, after which the temperature was raised to 120°C and a reduced pressure dehydration treatment was carried out for 1 hour. Next, the supply of ethylene oxide was started at a temperature of 120°C or higher. At this time, the reaction was carried out at a reaction temperature of 155 to 165°C and a pressure of 0.5 MPa·G or lower.
After feeding 28 molar equivalents of ethylene oxide per molar equivalent of stearylamine, the mixture was aged until the internal pressure became constant, to obtain A-5.

(Synthesis of A-6)
Stearylamine was charged into the autoclave, and the inside of the vessel was substituted with nitrogen. Next, the supply of ethylene oxide was started at a temperature of 120°C or higher. At this time, the reaction was carried out at a reaction temperature of 155 to 165°C and a pressure of 0.5 MPa·G or lower. After supplying 2 molar equivalents of ethylene oxide per molar equivalent of stearylamine, the mixture was aged until the internal pressure became constant. Next, sodium hydroxide was charged into the autoclave as a catalyst, and the mixture was substituted with nitrogen, after which the temperature was raised to 120°C and a reduced pressure dehydration treatment was carried out for 1 hour. Next, the supply of ethylene oxide was started at a temperature of 120°C or higher. At this time, the reaction was carried out at a reaction temperature of 155 to 165°C and a pressure of 0.5 MPa·G or lower.
After feeding 48 molar equivalents of ethylene oxide per molar equivalent of stearylamine, the mixture was aged until the internal pressure became constant, to obtain A-6.

(Synthesis of A-r1)
Laurylamine and sodium hydroxide were charged into an autoclave, and the autoclave was purged with nitrogen, after which the temperature was raised to 120°C and dehydration treatment was carried out under reduced pressure for 1 hour. Next, the supply of ethylene oxide was started at a temperature of 120°C or higher. At this time, the reaction was carried out at a reaction temperature of 150 to 160°C and a pressure of 0.5 MPa·G or lower. After supplying 4 molar equivalents of ethylene oxide per molar equivalent of laurylamine, the reaction was aged until the internal pressure became constant, and A-r1 was obtained.

(Synthesis of A-r2)
Laurylamine was charged into the autoclave, and the inside of the vessel was replaced with nitrogen. Next, the supply of ethylene oxide was started at a temperature of 120°C or higher. At this time, the reaction was carried out at a reaction temperature of 155 to 165°C and a pressure of 0.5 MPa·G or lower. After supplying 2 molar equivalents of ethylene oxide per molar equivalent of laurylamine, the mixture was aged until the internal pressure became constant. Next, potassium hydroxide was charged into the autoclave as a catalyst, and the mixture was replaced with nitrogen, and then the temperature was raised to 120°C and a reduced pressure dehydration treatment was carried out for 1 hour. Thereafter, the supply of ethylene oxide was started at a temperature of 120°C or higher.
At this time, the reaction was carried out at a reaction temperature of 150 to 160°C and a pressure of 0.5 MPa·G or less. After 4 molar equivalents of ethylene oxide were supplied per 1 molar equivalent of laurylamine, maturation was carried out until the internal pressure became constant. Then, the supply of propylene oxide was started at a temperature of 120°C or more. At this time, the reaction was carried out at a reaction temperature of 120 to 130°C and a pressure of 0.5 MPa·G or less. After 4 molar equivalents of propylene oxide were supplied per 1 molar equivalent of laurylamine, maturation was carried out until the internal pressure became constant, and A-r2 was obtained.

The compounds shown below were used as component (B) and comparative products.
B-1: Polyoxyethylene (n1) polyoxybutylene (n2) C13-15 (branched or linear) alkyl monomethyl ether (manufactured by BASF, trade name "Plurafac LF 132", n1 and n2 are natural numbers, and the sum of n1 and n2 is 200 or less. In the general formula (2), R ² is a branched or linear alkyl group having 13 to 15 carbon atoms, R ³ is a methyl group, A ³ O is an ethyleneoxy group or a butyleneoxy group, and m is 2 to 200, compound (2), cloud point is 0° C. or more and less than 20° C.).
B-2: Polyoxyethylene (1-200) C12-14 linear alkyl monobutyl ether (manufactured by BASF, trade name "Dehypon LS 104", a compound (2) in which, in the general formula (2), R ² is a linear alkyl group having 12 to 14 carbon atoms, R ³ is a butyl group, A ³ O is an ethyleneoxy group, and m is 1 to 200; cloud point is 0° C. or higher and lower than 30° C.).
B-3: Polyoxyethylene (1-200) C12-18 linear alkyl monobutyl ether (manufactured by BASF, trade name "Dehypon LT 104", a compound (2) in which, in the general formula (2), R ² is a linear alkyl group having 12 to 14 carbon atoms, R ³ is a butyl group, A ³ O is an ethyleneoxy group, and m is 1 to 200; cloud point is 0° C. or higher and lower than 30° C.).
B-r1: polyoxyethylene (7) decyl ether (manufactured by Aoki Oil Industries Co., Ltd., product name "Safetycut ND-2061", a compound in which, in the general formula (2), R ² is a linear alkyl group having 10 carbon atoms (decyl group), R ³ is a hydrogen atom, A ³ O is an ethyleneoxy group, and m is 7, cloud point 60° C.).
B-r2: polyoxyethylene (12) polyoxypropylene (3) lauryl ether (a compound represented by the general formula (2) above, in which R ² is a linear alkyl group having 12 carbon atoms (lauryl group), R ³ is a hydrogen atom, A ³ O is an ethyleneoxy group and a propyleneoxy group arranged in a block shape, and m is 15; cloud point: 55° C.; synthesized by the synthesis method described below).
B-r3: Polyoxyethylene (9) lauryl ether (a compound represented by the general formula (2) above, in which R ² is a linear alkyl group having 12 carbon atoms (lauryl group), R ³ is a hydrogen atom, A ³ O is an ethyleneoxy group, and m is 9; cloud point: 56° C.; synthesized by the synthesis method described below).
B-r4: Polyoxyethylene (9) C12 linear alkyl monobutyl ether (a compound represented by the general formula (2) above, in which R ² is a linear alkyl group having 12 carbon atoms (lauryl group), R ³ is a butyl group, A ³ O is an ethyleneoxy group, and m is 9; cloud point is greater than 40° C.; synthesized by the synthesis method described below).

(Synthesis of B-r2)
A nonionic surfactant in which 12 moles of ethylene oxide are added to lauryl alcohol (manufactured by Nippon Shokubai Co., Ltd., product name "Softanol 120") and sodium hydroxide were charged into an autoclave, and the inside of the vessel was replaced with nitrogen. Next, the temperature was raised to 120°C, and a dehydration treatment was carried out under reduced pressure for 30 minutes. Thereafter, the supply of propylene oxide was started at 120°C or higher. At this time, the reaction was carried out at a reaction temperature of 120 to 130°C and a pressure of 0.5 MPa·G or less. After supplying 3 molar equivalents of propylene oxide per molar equivalent of the nonionic surfactant in which 12 moles of ethylene oxide are added to lauryl alcohol, the mixture was aged until the internal pressure became constant, and B-r2 was obtained.

(Synthesis of B-r3)
Lauryl alcohol and potassium hydroxide were charged into an autoclave, and the inside of the vessel was replaced with nitrogen. Next, the temperature was raised to 120°C, and dehydration treatment under reduced pressure was carried out for 30 minutes. Thereafter, the supply of ethylene oxide was started at a temperature of 120°C or higher. At this time, the reaction was carried out at a reaction temperature of 150 to 160°C and a pressure of 0.5 MPa·G or lower. After supplying 9 molar equivalents of ethylene oxide per molar equivalent of lauryl alcohol, the mixture was aged until the internal pressure became constant, and B-r3 was obtained.

(Synthesis of B-r4)
Lauryl alcohol and potassium hydroxide were charged into an autoclave, and the inside of the vessel was replaced with nitrogen. Next, the temperature was raised to 120°C, and dehydration treatment under reduced pressure was performed for 30 minutes. Thereafter, the supply of ethylene oxide was started at a temperature of 120°C or higher. At this time, the reaction was performed at a reaction temperature of 150 to 160°C and a pressure of 0.5 MPa·G or less. After supplying 9 molar equivalents of ethylene oxide per molar equivalent of lauryl alcohol, the mixture was aged until the internal pressure became constant. Thereafter, the mixture was diluted with THF, reacted with NaH while cooling with ice, and then reacted with C ₄ H ₉ Cl to obtain B-r4.

As the component (C), the compound shown below was used.
C-1: Sodium decanoate (manufactured by NOF Corporation, trade name "NAA-102").
C-2: Sodium laurate (manufactured by New Japan Chemical Co., Ltd., trade name "Laurinsan P").
C-3: Sodium stearate (manufactured by New Japan Chemical Co., Ltd., trade name "Stearinsan #300").
C-4: Sodium ethylhexyl sulfate (manufactured by NOF Corporation, trade name "Syntrex EH-R").
C-5: Sodium linear alkyl (carbon number 10 to 14) benzenesulfonate (manufactured by Teika Corporation, trade name "Teika Power L121").
C-6: Sodium alkane (carbon number 14 to 17) sulfonate (manufactured by Clariant Japan Co., Ltd., trade name "HOSTAPUR SAS 93").

Water and the compounds shown below were used as optional components.
・Water: Ion-exchanged water.
Lauryl alcohol: product name "Conol 20P", manufactured by New Japan Chemical Co., Ltd.
Ethylhexanol: Manufactured by Mitsubishi Chemical Corporation, trade name "2-Ethylhexanol".
Isoparaffin: Hydrocarbon solvent (manufactured by Idemitsu Kosan Co., Ltd., product name "IP Solvent 2028").
EDTA-2Na: disodium ethylenediaminetetraacetate (manufactured by Nagase ChemteX Corporation, trade name "Clewat N").
TEA: Triethanolamine (manufactured by Mitsui Chemicals, Inc., product name "Triethanolamine").
NaOH: Sodium hydroxide (manufactured by Tokuyama Corporation, product name "Caustic Soda (48%)").

[Measurement and evaluation method]
<Cloud point measurement>
A 1% by mass aqueous solution of the measurement sample was poured into a test tube to a height of about 40 mm, a thermometer was placed in it, and the solution was heated with thorough stirring using the thermometer to a temperature about 2 to 3°C higher than the temperature at which clouding occurred, and then air-cooled again with thorough stirring. The temperature at which the solution became transparent was taken as the cloud point.
If the solution was cloudy at room temperature (20°C), it was cooled with thorough stirring until the solution became transparent, and then gradually heated again with thorough stirring to a temperature at which the solution became cloudy. Then, it was gradually cooled with stirring, and the temperature at which the solution became transparent was measured, and this value was recorded as the cloud point.

<Appearance evaluation>
The appearance of the hard surface cleaner was visually observed and evaluated according to the following criteria.
"Evaluation criteria"
◯: Transparent. Excellent visibility, easy to confirm whether dirt on the cleaning target has been removed, and easy to confirm whether dirt has been transferred to the cleaning solution.
△: Slightly cloudy.
×: Completely cloudy. Visibility is poor, and it is sometimes difficult to confirm that dirt on the object to be cleaned has been removed, and it is difficult to confirm that dirt has been transferred to the cleaning solution.

<Evaluation of cleaning ability>
The hard surface cleaner was diluted with tap water to a concentration of 1% by mass to prepare a cleaning solution.
An 11 x 7 cm plate (made of polytetrafluoroethylene (PTFE) or stainless steel (SUS)) was used as the object to be cleaned, with one of the cosmetics shown below (0.1 g) evenly applied to the surface in a circle with a diameter of 4.5 cm as dirt.
(cosmetics)
-Foundation (manufactured by Chifure Cosmetics Co., Ltd., product name "BB Cream").
- Lip balm (manufactured by Omi Brotherhood Co., Ltd., product name "Menturm Medicinal Medical Lipstick Mn").
- Sunscreen cream (manufactured by Kose Corporation, product name "Suncut Sunscreen Gel 50").

A cleaning solution (amount of cleaning bath: 1000 mL) set at 60°C was circulated by a pump (pump flow rate: 16 L/19 min), and the cleaning solution was sprayed onto a vertically standing object from a distance of 4 cm for 5 minutes while circulating. The weight of the object was measured before and after spraying the cleaning solution, and the dirt removal rate was calculated by the following formula (i). A removal rate of 80% or more was considered to be acceptable.
Removal rate (%)=(weight of object to be cleaned before spraying−weight of object to be cleaned after spraying)/weight of object to be cleaned before spraying)×100 (i)

<Evaluation of foam suppression ability>
The hard surface cleaner was diluted with tap water to a concentration of 1% by mass to prepare a cleaning solution.
100 mL of the cleaning solution set at 60°C was poured into a graduated 500 mL measuring cylinder, and aeration was performed for 10 seconds (aeration rate: 2100 mL/min) using a Kinoshita glass filter bowl filter (Kinoshita Rika Kogyo Co., Ltd.). The foam height (mm: distance from the boundary between the foam and the cleaning solution to the top surface of the foam) immediately after aeration was measured. A foam height of 200 mm or less was considered to be acceptable.
From the viewpoint of suitability for machine washing, the foam height is preferably less than 200 mm, and more preferably less than 100 mm.

"Examples 1 to 32, Comparative Examples 1 to 10"
According to the formulations in Tables 1 to 4, components (A), (B), (C) and optional components were added to water and mixed to obtain a cleaning agent for hard surfaces.
The appearance, cleaning properties, and foam suppression properties of the resulting hard surface cleaners were evaluated. The results are shown in Tables 1 to 4. The amounts (mass%) of the components other than water shown in each table are the amounts (concentrations) of the non-volatile components.

In Tables 1 to 4, the amount (mass %) of each component is the percentage relative to the total mass of the hard surface cleaner, and unless otherwise specified, is expressed as a value converted to pure content. "Balance" indicates that water is added so that the total amount (mass %) of all components contained in the hard surface cleaner in each example is 100 mass%, and means the remainder after subtracting the total content of components other than water from 100 mass%. Also, a blank column for the amount means that the component is not added (amount 0 mass%).

As is clear from Tables 1 to 4, the hard surface cleaners obtained in the respective Examples had excellent cleaning and foam suppressing properties. In particular, the hard surface cleaners containing component (C) also had excellent transparency.
On the other hand, as is clear from Table 4, the hard surface cleaners obtained in Comparative Examples 1 and 2, which contained polyoxyalkylene alkylamines having cloud points of less than 60° C., were inferior in cleaning properties and appearance (transparency).
The hard surface cleaners obtained in Comparative Examples 3 to 6, 9, and 10, which contained polyoxyalkylene alkyl ethers or polyoxyethylene alkyl monobutyl ethers having cloud points of more than 40° C., were poor in foam suppression properties.
The hard surface cleaner obtained in Comparative Example 7, which did not contain compound (1), was inferior in cleaning ability and appearance (transparency).
The hard surface cleaner obtained in Comparative Example 8, which did not contain compound (2), was inferior in cleaning properties and foam suppression properties.

The hard surface cleaner of the present invention has excellent cleaning and foam suppression properties even when the object to be cleaned is cleaned by mechanical cleaning, and is useful as a cleaner for mechanical cleaning using a mechanical cleaner such as a washer-disinfector.

Claims (3)

A hard surface cleaning agent comprising: a compound (1) having a cloud point of 60° C. or higher and represented by the following general formula (1); and a compound (2) having a cloud point of 40° C. or lower and represented by the following general formula (2).

In formula (1), R ¹ is a linear or branched alkyl group having 6 to 24 carbon atoms, or a linear or branched alkenyl group having 6 to 24 carbon atoms; A ¹ O and A ² O are each independently an alkyleneoxy group having 2 to 4 carbon atoms; p represents the average number of repetitions of A ¹ O and is a number from 1 to 100; and q represents the average number of repetitions of A ² O and is a number from 1 to 100.
However, when p is greater than 1, the multiple A ¹ Os may be the same as or different from each other, and when q is greater than 1, the multiple A ² Os may be the same as or different from each other.

In formula (2), R ² is a linear or branched, saturated or unsaturated hydrocarbon group having 6 to 22 carbon atoms, which may contain one or more bonds selected from the group consisting of an ether bond, an ester bond, and an amide bond, A ³ O is an alkyleneoxy group having 2 to 4 carbon atoms, and m indicates the average number of repetitions of A ³ O and is a number from 1 to 200. However, when m is 1, A ³ O is an ethyleneoxy group. When m is more than 1, the multiple A ³ O may be the same or different from each other. R ³ is a linear or branched alkyl group having 1 to 18 carbon atoms, or a linear or branched alkenyl group having 2 to 18 carbon atoms. The hard surface cleaner of claim 1, further comprising an anionic surfactant. A method for cleaning a hard surface, comprising cleaning the hard surface with the hard surface cleaner according to claim 1 or 2.