JP2016198765A - Cleaning method of tableware - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cleaning method of a tableware excellent in detergency for not only a portion reachable by hand but also a detail hardly reachable or unreachable by hand, relative to oil contamination adhering to a tableware surface.SOLUTION: In a cleaning method of a tableware, bubbles in which (I) an initial bubble specific volume (ml/g) is 20 or more and 50 or less, and (II) the bubble specific volume (ml/g) after 5 minutes is 10 or less, which are prepared from a liquid detergent composition for a tableware containing a surfactant and water, are brought into contact with a tableware surface to which oil contamination adheres, to thereby clean the surface without depending on mechanical force.SELECTED DRAWING: None

Description

  The present invention relates to a tableware cleaning method and a tableware liquid detergent article.

  There is a strong demand for dishwashing agents for hand washing that have a strong detergency against oil stains. In particular, in tableware having a hydrophobic surface such as a plastic tapper and lunch box, oil stains containing a large amount of solid fat such as beef tallow and pork fat are difficult to remove, and high detergency is required. For this reason, a cleaning method is generally used in which hot water of about 40 ° C. to 45 ° C. is used, or a device such as washing twice is used.

Patent Document 1 includes the following (a) to (c), and the total of the surfactants including (a) and (b) is 3 to 20% by mass, and the mass ratio (a) :( b) A spray-type cleaning product for dishwashing characterized in that a liquid cleaning composition having a ratio of 2: 1 to 20: 1 is converted into droplets or foams and filled into a container to be discharged. It is described that an excellent detergency is exerted by adhering the dirt so as to be covered with droplets or bubbles.
(A) Anionic surfactant (b) Semipolar surfactant (c) Ethanol 0.1-20% by mass
Patent Document 2 includes (a) 10 to 30% by weight of at least one selected from the group consisting of a nonionic surfactant and an anionic surfactant, (b) 0.1 to 10% by weight of a diol solvent, and (C) containing at least one selected from the group consisting of an alkylene oxide adduct of a polyhydric alcohol and a benzenesulfonate salt which is unsubstituted or substituted with an alkyl group or alkenyl group having 1 to 5 carbon atoms; ) Component and (c) component weight ratio (b) / (c) = 1/10 to 10/1 is disclosed.

JP 2004-217908 A Japanese Patent Laid-Open No. 11-116987

  The present invention provides a tableware cleaning method and a dishwashing liquid cleaning agent that is excellent not only for a part that can be reached by hand, but also for a part that cannot be reached or a part that is difficult to reach for oil stains attached to the surface of the tableware. It relates to goods.

  The present invention was prepared from a liquid detergent composition for tableware containing a surfactant and water. (I) Initial foam specific volume (ml / g) of 20 to 50 and (II) after 5 minutes It is related with the washing | cleaning method of the tableware which makes the foam whose specific foam volume (ml / g) is 10 or less contact the surface of the tableware to which oily dirt adhered, and wash | cleans without applying mechanical force.

  The present invention also provides a tableware liquid detergent composition containing a surfactant and water, wherein the composition comprises (I) an initial foam specific volume (ml / g) of 20 to 50, (II) The present invention relates to a liquid detergent product for tableware, which is housed in a spray container that discharges with a foam having a foam specific volume (ml / g) of 10 or less after 5 minutes.

ADVANTAGE OF THE INVENTION According to this invention, it is excellent also in the washing | cleaning method of the tableware and the liquid for tableware which is excellent not only in the part which can be reached but also in the part which cannot be reached, and the detail which is hard to reach with respect to the oil stain adhering to the tableware surface. A cleaning article can be provided.
That is, according to the present invention, it is possible to clean the oil stains adhering to the surface and the gap of the tableware without rubbing using a flexible material such as a sponge, that is, without applying mechanical force. It is possible to provide a dishwashing method and a dishwashing liquid detergent composition having excellent detergency.

[How to wash dishes]
The present inventor prepared (I) initial foam specific volume (ml / g) of 20 to 50 and (II) 5 minutes, prepared from a liquid detergent composition for tableware containing a surfactant and water. The dish washing method is to bring the foam with a specific foam volume (ml / g) of 10 or less into contact with the table surface on which oily dirt adheres and without applying mechanical force. In addition to this, we have found that it is excellent in cleanability of parts that are out of reach and difficult to reach.
The reason for this is that the initial foam specific volume, that is, the foam specific volume immediately after the foam is discharged by spraying or the like is large, so that the surface of the tableware can be widely washed with a small amount of surfactant, but time passes. Thus, it is estimated that as the foam specific volume becomes smaller, the foam shrinks and becomes liquid and spreads across the crevice of the tableware, so that it is possible to increase the detergency of details.
On the other hand, if the liquid is sprayed directly from the spray instead of bubbles, the liquid containing the surfactant is sprayed in the air, which makes it difficult for the user of the spray to breathe. . Therefore, the present invention is a cleaning method that is easy to use and has high cleaning power because foam is applied using a spray or the like.

In the tableware washing method of the present invention, (I) the initial foam specific volume (ml / g) is 20 or more, preferably 25 or more, from the viewpoint of improving the washability by spreading bubbles over the surface of the tableware that can be reached. More preferably, it is 30 or more, more preferably 35 or more. From the viewpoint of increasing the amount of surfactant in the foam and enhancing the detergency, it is 60 or less, preferably 55 or less, more preferably 50 or less, still more preferably. 45 or less.
In the present invention, the initial foam specific volume refers to a specific volume of foam 10 seconds after the foam is discharged by spraying or the like. The initial foam specific volume can be measured by the method of the example. It is preferable that the surface of the tableware is brought into contact with foam having a foam specific volume of the value indicated by the initial foam specific volume.
In order to increase the foam specific volume, a method using an anionic surfactant, preferably a method using both an anionic surfactant and an amphoteric surfactant, a method for increasing the concentration of the surfactant to be blended, and a spray nozzle For example, a method of increasing the amount of air mixed with the surfactant and air may be considered.

In the tableware cleaning method of the present invention, (II) the foam specific volume (ml / g) after 5 minutes is 10% from the viewpoint of enhancing the cleanability by eliminating the foam and spreading it as a liquid to the unreachable part. Hereinafter, it is preferably 8 or less, more preferably 6 or less, still more preferably 5 or less, and may be 0 or more.
In the present invention, the foam specific volume after 5 minutes refers to the foam specific volume after 5 minutes after the foam is discharged by spraying or the like. The foam specific volume after 5 minutes can be measured by the method of Examples.
In order to reduce the foam specific volume 5 minutes after the foam is discharged by spraying or the like, a surfactant having a branched chain hydrocarbon group, preferably an anionic surfactant having a branched chain hydrocarbon group, is used. Examples thereof include a method for reducing foam stability, a method for reducing foam stability by using a large amount of solvent, and a method for reducing the concentration of a surfactant to be blended.

  In the tableware cleaning method of the present invention, the ratio (I) / (II) of the foam specific volume (I) at the initial stage and the foam specific volume after 5 minutes (I) / (II) From the viewpoint of excellent detergency of the part that does not reach, preferably 5 or more, more preferably 7 or more, still more preferably 10 or more, preferably 20 or less, more preferably 18 or less, still more preferably 15 or less. .

Hereinafter, the liquid detergent composition for tableware used in the tableware cleaning method of the present invention will be described.
[Surfactant]
The surfactant preferably contains (a) an anionic surfactant [hereinafter also referred to as component (a)] from the viewpoint of increasing the initial foam specific volume. The component (a) is more preferably an anionic surfactant having a branched chain hydrocarbon group from the viewpoint of reducing the foam specific volume after 5 minutes.
The surfactant preferably contains (b) an amphoteric surfactant [hereinafter also referred to as component (b)] from the viewpoint of increasing the initial foam specific volume.
The surfactant preferably contains (c) a nonionic surfactant (hereinafter also referred to as component (c)) from the viewpoint of enhancing the detergency. The component (c) is more preferably a nonionic surfactant having a branched chain hydrocarbon group from the viewpoint of reducing the foam specific volume.
The branched hydrocarbon group preferably has 5 or more carbon atoms, more preferably 8 or more, and preferably 21 or less, more preferably 18 or less, and still more preferably 14 or less. The branched chain hydrocarbon group is preferably a branched chain saturated hydrocarbon group, more preferably a branched chain alkyl group, from the viewpoint of detergency.
The branched chain hydrocarbon group may be iso-branched at the end of the hydrocarbon group or may be a hydrocarbon group derived from a secondary alcohol (residue obtained by removing the hydroxyl group from the secondary alcohol).
Details are described below. Other surfactants include cationic surfactants.

  The surfactant is preferably a combination with one or more surfactants selected from the components (a), (b) and (c) from the viewpoint of increasing the detergency and initial foam specific volume, and further 5 From the viewpoint of lowering the foam specific volume, the anionic surfactant having a branched chain hydrocarbon group as the component (a), the nonionic surfactant having the branched chain hydrocarbon group as the component (b) and (c) A combination with one or more surfactants selected from the group consisting of an anionic surfactant having a branched hydrocarbon group as the component (a), a branched hydrocarbon group as the component (b) and the component (c) is more preferable. The combination with the nonionic surfactant which has is still more preferable.

<(A) component>
The component (a) is an anionic surfactant. Examples of the anionic surfactant include (a1) a sulfosuccinic acid ester represented by the following general formula (a1) or a salt thereof (hereinafter referred to as (a1) component), and (a2) a hydrocarbon group having 8 to 21 carbon atoms. And one or more anionic surfactants selected from the group consisting of an anionic surfactant having a sulfate ester group or a sulfonic acid group [excluding the component (a1)] (hereinafter referred to as the component (a2)) preferable.

[In formula, R < ^1a >, R < ^2a > is respectively independently a C5-C18 linear or branched hydrocarbon group. A ¹ and A ² are each independently an alkylene group having 2 or more and 4 or less carbon atoms, and x and y are average added mole numbers, and are each independently 0 or more and 6 or less. M ¹ is a hydrogen atom or a cation. ]

<(A1) component>
The component (a1) used in the present invention is a sulfosuccinic acid ester represented by the following general formula (a1) or a salt thereof.

[In formula, R < ^1a >, R < ^2a > is respectively independently a C5-C18 linear or branched hydrocarbon group. A ¹ and A ² are each independently an alkylene group having 2 or more and 4 or less carbon atoms, and x and y are average added mole numbers, and are each independently 0 or more and 6 or less. M ¹ is a hydrogen atom or a cation. ]

In general formula (a1), R ^1a and R ^2a each independently represent 5 or more carbon atoms, preferably 6 or more, more preferably 7 or more, still more preferably 8 or more, and 18 or less carbon atoms, preferably 16 carbon atoms. In the following, it is more preferably 14 or less linear or branched hydrocarbon group. R ^1a and R ^2a are each independently preferably a branched alkyl group.
In the general formula (a1), A ¹ and A ² are each independently an alkylene group having 2 or more carbon atoms and 4 or less carbon atoms, preferably 3 or less carbon atoms.
In general formula (a1), x and y are average added mole numbers, and from the viewpoint of detergency, each is independently 0 or more and 6 or less, preferably 4 or less, more preferably 2 or less, More preferably, it is 0.
Further, x + y is preferably 0 or more and preferably 12 or less, more preferably 6 or less, still more preferably 3 or less, and still more preferably 0, from the viewpoint of detergency.

In general formula (a1), R ^1a and R ^2a are each preferably an alkyl group selected from a 2-ethylhexyl group, a sec-octyl group, an isopentyl group, an isononyl group, and an isodecyl group, and more preferably a sec-octyl group. An alkyl group selected from a group, an isodecyl group and a 2-ethylhexyl group, more preferably a 2-ethylhexyl group.

In general formula (a1), M ¹ is a hydrogen atom or a cation. Examples of the cation include inorganic cations such as sodium ion, ammonium ion, potassium ion and magnesium ion, and organic cations such as monoethanolammonium ion, diethanolammonium ion, triethanolammonium ion and morpholinium ion. The cation is preferably an inorganic cation selected from sodium ion, ammonium ion, potassium ion and magnesium ion.

The component (a1) is not particularly limited as a method for preparing a compound in which R ^1a and R ^2a are the same. For example, the method described in US Pat. No. 2,028,091 is referred to. In addition, an asymmetric compound in which R ^1a and R ^2a are different can be produced with reference to, for example, Japanese Patent Application Laid-Open No. 58-24555. When using a commercially available compound, PALEX OT-P manufactured by Kao Corporation (a compound in which R ^1a and R ^2a are both 2-ethylhexyl groups), Luensit-A-BO manufactured by BASF (both R ^1a and R ^2a are 2) -Compound having an ethylhexyl group), Aerol CT-1L (a compound in which R ^1a and R ^2a are both 2-ethylhexyl groups) manufactured by Toho Chemical Industry Co., Ltd., and the like can be used. As a raw material for the component (a1), a product obtained by adding an alkylene oxide to an alcohol having a predetermined carbon number can also be used.

<(A2) component>
The component (a2) used in the present invention is an anionic surfactant (except for the component (a1)) having a hydrocarbon group having 8 to 21 carbon atoms and a sulfate ester group or a sulfonic acid group.

  The hydrocarbon group (a2) has a carbon number of 8 or more, preferably 10 or more, more preferably 12 or more, and 21 or less, preferably 18 or less, more preferably 14 or less, from the viewpoint of detergency. Preferably it is 12 or less. The hydrocarbon group of component (a2) is preferably a linear or branched alkyl group, and more preferably a branched alkyl group.

  The anionic surfactant (a2) is preferably at least one selected from alkyl sulfate esters, polyoxyalkylene alkyl ether sulfates, and alkane sulfonates.

From the viewpoint of detergency, the anionic surfactant having a sulfate ester group has 8 or more carbon atoms, preferably 10 or more, and 21 or less, preferably 18 or less, more preferably 14 or less, still more preferably 12 or less. Alkyl sulfate ester salts having a linear or branched alkyl group are preferred.
The anionic surfactant having a sulfate ester group and a polyoxyalkylene group has a carbon number of 8 or more, preferably 10 or more, and 21 or less, preferably 18 or less, more preferably from the viewpoint of detergency. The average added mole number of an oxyalkylene group having a linear or branched alkyl group of 14 or less, more preferably 12 or less, and having 2 or more and 3 or less carbon atoms is preferably 0.1 or more, more preferably 0.3. More preferably, a polyoxyalkylene alkyl ether sulfate ester salt having a polyoxyalkylene group that is 0.4 or more, and preferably 6 or less, more preferably 3 or less, and even more preferably 1.5 or less is suitable. .
In addition, as the anionic surfactant having a sulfonic acid group, from the viewpoint of detergency,
(1) an alkylbenzene sulfonate having a straight chain or branched chain alkyl group having 6 to 15 carbon atoms, preferably a branched chain alkyl group, and
(2) A linear or branched alkyl group, preferably a branched alkyl group having 8 or more carbon atoms, preferably 10 or more, and 21 or less, preferably 18 or less, more preferably 14 or less, and even more preferably 12 or less. One or more anionic surfactants selected from alkane sulfonates having the formula:
In the case of (1) above, the branched alkyl group is preferably an alkyl group in which the carbon atom bonded to the benzene ring is a secondary carbon atom, from the viewpoint of reducing the foam specific volume after 5 minutes. In the case of (2), an alkyl group in which the carbon atom bonded to S is a secondary carbon atom is preferable.

  The salt of the anionic surfactant (a2) is selected from inorganic salts such as sodium salt, ammonium salt, potassium salt and magnesium salt, monoethanolammonium salt, diethanolammonium salt, triethanolammonium salt and morpholinium salt. Organic ammonium salts are preferred.

As the component (a2), a compound represented by the following general formula (a2) is preferable from the viewpoint of increasing the initial foam specific volume.
R ^11a —O— (R ^12a O) _n —SO ₃ M ² (a2)
[Wherein, R ^11a is a linear or branched alkyl group having 8 to 21 carbon atoms, preferably a branched alkyl group, R ^12a is an ethylene group and / or a propylene group, and n is The average number of moles added is a number of 0 or more and 6 or less. M ² is a hydrogen atom or a cation, preferably an inorganic or organic cation. ]

In the general formula (a2), R ^11a has a carbon number of 8 or more, preferably 10 or more, and 21 or less, preferably 18 or less, more preferably 14 or less, and still more preferably 13 or less, from the viewpoint of detergency. It is a chain or branched chain alkyl group, and is preferably a branched chain alkyl group from the viewpoint of reducing the foam specific volume after 5 minutes, and is preferably a secondary alkyl group from the viewpoint of detergency. Here, the secondary alkyl group is a residue obtained by removing a hydroxyl group from a secondary alcohol, and the carbon atom of R ^11a bonded to O in R ^11a O in the general formula (a2) is a secondary carbon. It is an atom.
Specifically, R ^11a is preferably a branched alkyl group having 12 to 13 carbon atoms.

In general formula (a2), n is preferably 0 or more, more preferably 0.1 or more, still more preferably 0.3 or more, still more preferably 0.4 or more, and preferably from the viewpoint of detergency. The number is 6 or less, more preferably 3 or less, and still more preferably 1.5 or less.
In the general formula (a2), when R ^12a is an ethylene group, n is preferably 0 or more, more preferably 0.1 or more, still more preferably 0.5 or more, and preferably from the viewpoint of detergency. Is 6 or less, more preferably 3 or less, and even more preferably 1.5 or less.
In the general formula (a2), when R ^12a is a propylene group, from the viewpoint of detergency, n is preferably 0 or more, more preferably 0.2 or more, still more preferably 0.4 or more, and The number is preferably 1.5 or less, more preferably 1.0 or less, and still more preferably 0.8 or less.
In the general formula (a2), when R ^12a is an ethylene group or a propylene group, n can be selected from these ranges.

In general formula (a2), M ² is a hydrogen atom, or an inorganic cation such as sodium ion, ammonium ion, potassium ion, magnesium ion, monoethanolammonium ion, diethanolammonium ion, triethanolammonium ion, morpholinium ion. Organic cations such as sodium ion, potassium ion, ammonium ion, and magnesium ion are preferable.

The method for preparing the compound of the general formula (a2) is not particularly limited. For example, after adding a predetermined amount of ethylene oxide and / or propylene oxide to the fatty alcohol represented by R ^11a -OH according to the purpose. It is produced by sulfate formation with a sulfating agent selected from sulfur trioxide (liquid or gas), sulfur trioxide-containing gas, fuming sulfuric acid and chlorosulfonic acid, and neutralization with a predetermined alkali agent. The addition reaction of ethylene oxide (hereinafter referred to as EO) and / or propylene oxide (hereinafter referred to as PO) requires a catalyst, and an alkali hydroxide such as NaOH or KOH can be used. Moreover, the catalyst which has a magnesium oxide as a main component as described in Unexamined-Japanese-Patent No. 8-323200 can be used, The former can obtain polyoxyethylene alkyl ether with comparatively wide addition mole number distribution, The latter is comparison. A compound having a narrow addition mole number distribution can be obtained. Further, as disclosed in JP-A-10-158384, it is also possible to control the added mole number distribution by using an alkali catalyst and a metal oxide catalyst in combination.

In formula ^{(a2), when R 11a} to obtain a compound containing a branched alkyl group as the alcohol represented by the raw material ^R 11a -OH, hydroformylating the number 8 to 14 of the 1-alkene carbon After condensing the alcohol obtained (contained from 15 mol% to 70 mol% of an alkyl group having a methyl group branched at the β-position with respect to the OH group) and an aldehyde having 4 to 8 carbon atoms, it is reduced. 3 obtained by hydroformylating a dimer of isobutene, which is obtained by the gel-type alcohol obtained (containing 100 mol% of a structure in which an alkyl group having 3 to 6 carbon atoms is branched at the β-position relative to the OH group). , 5,5-trimethylhexanol, a polybranched tridecanol obtained by hydroformylating a trimer of isobutene (branching rate is 100 mol%), petroleum, Examples thereof include synthetic alcohols having coal as a raw material (an alkyl group having a branching ratio of about 20 mol% to 100 mol%).

In the present invention, the component (a2) is a compound represented by the general formula (a2), wherein R ^11a is preferably 8 or more, more preferably 10 or more, and preferably 18 or less, more preferably Compounds having a branched alkyl group of 14 or less, more preferably 13 or less, and n of 0 are preferred.

  Examples of other anionic surfactants include linear or branched fatty acids or salts thereof.

<(B) component>
It is preferable that the surfactant contains an amphoteric surfactant as the component (b) from the viewpoint of increasing the initial foam specific volume. Examples of the amphoteric surfactant include one or more amphoteric surfactants selected from amine oxide, sulfobetaine, and carbobetaine. The amphoteric surfactant is preferably sulfobetaine.

  As the amine oxide, a compound of the following general formula (b1) is suitable.

[Wherein, R ^1b represents a hydrocarbon group having 8 to 22 carbon atoms, preferably an alkyl group or an alkenyl group, more preferably an alkyl group, and R ^2b and R ^3b may be the same or different and have 1 or more carbon atoms. 3 or less alkyl groups are shown. D represents a —NHC (═O) — group or a —C (═O) NH— group, and E represents an alkylene group having 1 to 5 carbon atoms. m and p represent m = 0 and p = 0 or m = 1 and p = 1. ]

In the general formula (b1), R ^1b is preferably an alkyl group having 10 to 18 carbon atoms, more preferably an alkyl group having 12 to 16 carbon atoms, from the viewpoint of detergency against solid fat. More preferred is an alkyl group having 12 to 14 carbon atoms, and even more preferred is an alkyl group having 12 carbon atoms. R ^2b and R ^3b are preferably a methyl group having 1 carbon atom from the viewpoint of detergency against solid fat.

  As sulfobetaine, the carbon number of the alkyl group is preferably 10 or more, preferably 18 or less, more preferably 14 or less, N-alkyl-N, N-dimethyl-N-sulfopropylammonium sulfobetaine, the carbon number of the alkyl group. Is preferably 10 or more, preferably 18 or less, more preferably 14 or less, and N-alkyl-N, N-dimethyl-N- (2-hydroxysulfopropyl) ammonium sulfobetaine, the number of carbon atoms of the alkanoyl group is preferably 10 or more , Preferably 18 or less, more preferably 14 or less N-alkanoylaminopropyl-N, N-dimethyl-N-sulfopropylammonium sulfobetaine, the alkanoyl group preferably has 10 or more carbon atoms, preferably 18 or less, more preferably 14 or less N-alkanoylaminopropy -N, include N- dimethyl-N-(2-hydroxy-sulfopropyl) ammonium sulfobetaine.

  As carbobetaine, the carbon number of the alkyl group is preferably 10 or more, preferably 18 or less, more preferably 14 or less, and N-alkyl-N, N-dimethyl-N-carboxymethylammonium betaine or the following general formula (b2) A compound represented by the following general formula (b2) is preferable from the viewpoint of detergency.

[Wherein, R ^4b represents an alkyl group or alkenyl group having 7 to 21 carbon atoms, R ^5b represents a propylene group, and R ^6b and R ^7b each independently represents an alkyl group having 1 to 3 carbon atoms. Indicates. ]

In the general formula (b2), R ^4b is preferably an alkyl group or an alkenyl group of 9 or more, more preferably 11 or more, and preferably 15 or less, more preferably 13 or less. Nonyl group, decyl group, undecyl group Group, dodecyl group and tridecyl group are preferred.
In general formula (b2), R ^6b and R ^7b are each independently preferably a methyl group.

<(C) Nonionic surfactant>
From the viewpoint of detergency, the surfactant preferably contains a nonionic surfactant as the component (c). The nonionic surfactant is preferably a nonionic surfactant having a branched chain hydrocarbon group from the viewpoint of reducing the detergency and the foam specific volume after 5 minutes.
As a nonionic surfactant, (c1) glyceryl ether having an alkyl group having 6 to 18 carbon atoms (hereinafter referred to as (c1) component) and (c2) a compound represented by the following general formula (c2) [hereinafter, One or more nonionic surfactants selected from (referred to as component (c2)]. As the component (c), the component (c1) and the component (c2) may be used in combination, or only one of them may be used. The component (c) is preferably the component (c1) from the viewpoint of rinsing properties.
^R2cO- (EO) _z- H (c2)
[Wherein R ^2c is a linear and / or branched alkyl group having 6 to 18 carbon atoms, EO is an ethyleneoxy group, z represents the average number of moles of EO added, and more than 0 The following numbers. ]

As the component (c1), a compound represented by the following general formula (c1) is preferable.
R ^1c —O— (Gly) _r —H (c1)
[Wherein, R ^1c represents an alkyl group having 6 to 18 carbon atoms, Gly represents a structural unit derived from glycerin, and preferably represents a residue obtained by removing one hydroxyl group and one hydrogen atom from glycerin; r represents a number from 1 to 4. ]

In the general formula (c1), R ^1c is preferably 6 or more carbon atoms, more preferably 7 or more carbon atoms, still more preferably 8 or more carbon atoms, and preferably 18 or less carbon atoms, more preferably 12 or less carbon atoms, More preferably, it is an alkyl group having 10 or less carbon atoms. ^Examples of R ^1c include a linear alkyl group and a branched alkyl group. Examples of the linear alkyl group include linear alkyl groups such as a hexyl group, a heptyl group, an octyl group, a nonyl group, and a decyl group. In the present invention, a branched alkyl group is preferred from the viewpoint of reducing the foam specific volume after 5 minutes. The branched alkyl group is preferably a group selected from 2-ethylhexyl group, sec-octyl group, isononyl group and isodecyl group, more preferably 2-ethylhexyl group or isodecyl group, and further preferably 2-ethylhexyl group.
In the general formula (c1), r is preferably 1 or more, and preferably 2 or less, and a compound in which r is 1 is more preferable. Further preferred compounds are those in which R ^1c is a 2-ethylhexyl group and r is 1.
In the general formula (c1), the structure represented by Gly is the structure represented by —CH ₂ CH (OH) CH ₂ — in which the hydroxyl group at the 1-position and the 3-position of glycerin is bonded, or the 1-position of glycerin. It is a structure represented by —CH (CH ₂ OH) CH ₂ — in which the hydroxyl group at the 2-position is bonded, and varies depending on the catalyst and reaction conditions.

In order to obtain the compound of the general formula (c1), for example, an alkyl alcohol represented by R ^1c —OH is used as an alcohol having 6 to 10 carbon atoms, an epoxy compound such as epihalohydrin or glycidol, and an acid catalyst such as BF ₃ , Or the method of manufacturing by making it react using an aluminum catalyst can be used.
For example, when 2-ethylhexanol is used, the obtained 2-ethylhexyl monoglyceryl ether is a mixture that can contain a plurality of products as described in JP-A No. 2001-49291.

The component (c2) is a compound represented by the following general formula (c2).
^R2cO- (EO) _z- H (c2)
[In the formula, R ^2c is a linear or branched alkyl group having 6 to 18 carbon atoms, EO is an ethyleneoxy group, z represents the average number of moles of EO added, and is greater than 0 and less than or equal to 100 Is a number. ]

The carbon number of R ^{2c in} the general formula (c2) is 6 or more, preferably 8 or more, more preferably 10 or more, still more preferably 12 or more, and 18 or less, preferably 14 from the viewpoint of detergency. It is as follows.
R ^2c in the general formula (c2) is preferably an alkyl group derived from a secondary alcohol from the viewpoint of reducing the foam specific volume after 5 minutes. Here, the alkyl group derived from the secondary alcohol is a residue obtained by removing the hydroxyl group from the secondary alcohol, and the carbon atom of R ^2c bonded to O in R ^2c O in the general formula (c2) is the second. It is a secondary carbon atom.

In the general formula (c2), the average added mole number z of EO is more than 0, preferably 1 or more, more preferably 3 or more, still more preferably 5 or more, and 110 or less from the viewpoint of detergency. The number is preferably 50 or less, more preferably 30 or less, still more preferably 20 or less, still more preferably 12 or less, and still more preferably 10 or less.
In addition, the compound of general formula (c2) may be further added with propylene oxide as long as the effects of the present invention are not impaired.

  Examples of other nonionic surfactants include alkyl polyglycosides (glycoside type nonionic surfactants).

〔solvent〕
The liquid detergent composition for tableware used in the present invention preferably contains a solvent (excluding water) from the viewpoint of reducing the foam specific volume after 5 minutes.

  The total carbon number of the solvent is preferably 2 or more, more preferably 3 or more, still more preferably 4 or more, still more preferably 5 or more, still more preferably 6 or more, preferably 10 or less, more preferably 8 or less. It is.

  The solvent is preferably a hydrophilic solvent having an octanol / water partition coefficient (LogPow) of 3.5 or less. Specific examples of the solvent include ethanol, isopropyl alcohol, ethylene glycol, propylene glycol, diethylene glycol, dipropylene glycol, glycerin, isoprene glycol, propylene glycol monomethyl ether, propylene glycol monoethyl ether, 3-methyl-3-methoxybutanol, phenoxyethanol. , Phenyl glycol, phenoxyisopropanol, butyl diglycol (diethylene glycol monobutyl ether), dibutylene glycol, and benzyl alcohol. Especially, the solvent has little influence on the foam specific volume at the time of foam discharge, and from the viewpoint of reducing the foam specific volume after 5 minutes, ethanol or a glycol-based water-soluble solvent having 2 to 10 carbon atoms is preferable. The glycol type belongs to either a compound having two hydroxyl groups and an ether compound in which one or both hydrogen atoms of the hydroxyl groups are substituted with other groups. From these viewpoints, the solvents are ethanol, propylene glycol (carbon number 3), ethylene glycol monobutyl ether (carbon number 6), propylene glycol monobutyl ether (carbon number 7), diethylene glycol monobutyl ether (carbon number 8), and dipropylene. One or more selected from glycol monobutyl ether (10 carbon atoms) is more preferable.

[Other ingredients]
The liquid detergent composition for tableware used in the present invention can contain a hydrotrope from the viewpoint of blending stability. As the hydrotrope, toluenesulfonic acid, xylenesulfonic acid, cumenesulfonic acid or a sodium, potassium or magnesium salt thereof is preferable, and p-toluenesulfonic acid or a salt thereof is particularly preferable.

  The liquid detergent composition for tableware used in the present invention can contain a chelating agent from the viewpoint of detergency. Examples of the chelating agent include citric acid, ethylenediaminetetraacetate, methylglycine diacetic acid, L-glutamic acid diacetic acid / tetrasodium, and the like.

[Composition etc.]
The liquid detergent composition for tableware used in the present invention is preferably 1% by mass or more, more preferably 3% by mass or more, and further preferably 4% by mass, from the viewpoint of increasing the initial foam specific volume. From the viewpoint of reducing the foam specific volume after 5 minutes, the content is preferably 20% by mass or less, more preferably 15% by mass or less, still more preferably 10% by mass or less, and still more preferably 8% by mass or less. To do.

  The liquid detergent composition for tableware used in the present invention is preferably 0.3% by mass or more, more preferably 0.5% by mass or more, more preferably (a) component from the viewpoint of increasing the initial foam specific volume. Preferably, it is 0.8% by mass or more, and from the viewpoint of reducing the foam specific volume after 5 minutes, it is preferably 8% by mass or less, more preferably 5% by mass or less, still more preferably 3% by mass or less.

  The liquid detergent composition for tableware used in the present invention is preferably 0.5% by mass or more, more preferably 1% by mass or more, and still more preferably, from the viewpoint of increasing the initial foam specific volume, the component (b). From the viewpoint of reducing the foam specific volume after 2 minutes or more and 5 minutes, it is preferably 8% by weight or less, more preferably 5% by weight or less, still more preferably 3% by weight or less.

  In the liquid detergent composition for tableware used in the present invention, the component (c) is preferably 0.5% by mass or more, more preferably 1% by mass or more, and still more preferably, from the viewpoint of increasing the initial foam specific volume. From the viewpoint of reducing the foam specific volume after 2 minutes or more and 5 minutes, it is preferably 8% by weight or less, more preferably 5% by weight or less, still more preferably 3% by weight or less.

  In the liquid detergent composition for tableware used in the present invention, the mass ratio (b) / (a) of the component (b) to the component (a) is preferably 0.1 from the viewpoint of increasing the initial foam specific volume. Above, more preferably 0.2 or more, still more preferably 0.3 or more, even more preferably 0.5 or more, still more preferably 0.8 or more, and from the viewpoint of reducing the foam specific volume after 5 minutes , Preferably 10 or less, more preferably 8 or less, still more preferably 5 or less.

The liquid detergent composition for tableware used in the present invention contains water. As the water, it is preferable to use ion exchange water, sterilized ion exchange water, or the like.
The liquid detergent composition for tableware used in the present invention preferably contains 30% by weight or more of water, more preferably 50% by weight or more, still more preferably 60% by weight or more, still more preferably 70% by weight or more, and , Preferably 98% by mass or less, more preferably 95% by mass or less, still more preferably 90% by mass or less.

  The liquid detergent composition for tableware used in the present invention is preferably 30% by mass or less, more preferably 25% by mass or less, and still more preferably 20% by mass or less, from the viewpoint of increasing the initial foam specific volume. More preferably, it is 18% by mass or less, and from the viewpoint of reducing the foam specific volume after 5 minutes, it is preferably 2% by mass or more, more preferably 3% by mass or more, still more preferably 5% by mass or more, and even more preferably. Is 8% by mass or more, more preferably 10% by mass or more, and still more preferably 12% by mass or more.

  The liquid detergent composition for tableware used in the present invention is preferably 0.1 or more, more preferably, from the viewpoint of increasing the initial foam specific volume by the mass ratio of the surfactant and the solvent [surfactant / solvent]. Is preferably 0.2 or more, more preferably 0.3 or more, and preferably 2 or less, more preferably 1 or less, still more preferably 0.8 or less, and still more preferably from the viewpoint of lowering the foam specific volume after 5 minutes. Preferably it is 0.6 or less.

  In the liquid detergent composition for tableware used in the present invention, the hydrotrope is preferably 0.5% by mass or more, more preferably 1% by mass or more, and still more preferably 1.5% by mass from the viewpoint of blending stability. % Or more, and preferably 15% by mass or less, more preferably 10% by mass or less, and still more preferably 5% by mass or less.

  In the liquid detergent composition for tableware used in the present invention, the chelating agent is preferably 0.1% by mass or more, more preferably 1% by mass or more, still more preferably 2% by mass or more, from the viewpoint of detergency. , Preferably 15% by mass or less, more preferably 10% by mass or less, still more preferably 6% by mass or less.

  The pH at 25 ° C. of the liquid detergent composition for tableware used in the present invention is preferably 2 or more, more preferably 4 or more, more preferably 5 or more, and preferably 10 from the viewpoint of mildness to the hand. Below, more preferably 9 or less, still more preferably 8 or less.

  The viscosity at 20 ° C. of the liquid detergent composition for tableware used in the present invention is preferably 0.5 mPa · s or more, more preferably 1 mPa · s or more, and preferably 50 mPa · s or less, more preferably 20 mPa · s. s or less, more preferably 10 mPa · s or less, even more preferably 7 mPa · s or less, and even more preferably 5 mPa · s or less. The viscosity can be adjusted with a solvent or a hydrotrope.

In the liquid detergent composition for tableware used in the present invention, the solid content is preferably 0.6% by mass or more, more preferably 1% by mass or more, and further preferably 2% by mass from the viewpoint of detergency. From the viewpoint of reducing the raw material cost and the discharge property when using a container equipped with a sprayer, preferably 50% by mass, more preferably 3% by mass or more, still more preferably 4% by mass or more. % Or less, more preferably 45% by mass or less, still more preferably 40% by mass or less, still more preferably 35% by mass or less, still more preferably 30% by mass or less, and still more preferably 29% by mass or less.
Here, the solid content is a component other than water.

<Washing method>
The tableware cleaning method of the present invention comprises bringing the liquid detergent composition for tableware into contact with the surface of a tableware that is foamy and undiluted and to which oil stains, preferably oil stains containing solid fats, are adhered. This is a method for cleaning dishes without washing. In the cleaning method of the present invention, the liquid detergent composition for tableware is brought into contact with a dish surface which is foamy and is not diluted with oil stains, preferably oil stains containing solid fat, without applying mechanical force. It is preferable to leave it for cleaning.
Cleaning the tableware surface without applying mechanical force is, for example, that no intentional operation for cleaning is performed except for contact with the composition. For example, it can be understood that the contacted composition naturally flows down the surface of the tableware and that vibrations not intended for cleaning are transmitted to the surface of the tableware to clean the tableware surface without applying mechanical force.
In order to bring the liquid detergent composition for dishware into contact with a tableware surface to which oily dirt, preferably oily dirt containing solid fat, is attached without diluting, the detergent composition is intentionally diluted with water or the like. Then, it is made to contact and wash | clean with the tableware surface to which solid fat dirt adhered. For example, when the liquid detergent composition for tableware comes into contact with a tableware surface to which water drops or the like are attached, or after the liquid detergent composition for tableware is brought into contact with the tableware surface, water drops adhere to a hard surface It can be understood that the dishwashing liquid detergent composition is washed without dilution.
After leaving it alone, it is usually rinsed with water. When rinsing, mechanical force (physical force) may be applied by hand, or it may be simply rinsed with a water stream.

  The oil stain containing solid fat is a stain containing oil and fat, and the oil and fat exhibits a solid at normal temperature (for example, 20 ° C.). The oil stain containing solid fat is typically an oil stain containing solid fat, and an oil stain containing solid fat and liquid oil. The state of the oil stain containing solid fat when contacting the liquid detergent composition for tableware may be a state where solid fat and liquid oil are mixed.

  In the present invention, the undiluted solution of the liquid detergent composition for tableware is allowed to adhere to the surface of the tableware as it is, that is, without changing the composition, in the form of foam and oily dirt, preferably oily dirt containing solid fat. For example, the liquid detergent composition for tableware is brought into contact with the surface of the tableware in the form of foam and oily dirt, preferably oily dirt containing solid fat, without adhering to a sponge containing water. After contacting the tableware surface, the composition of the dishwashing liquid detergent composition may vary. That is, after contacting the tableware surface, the composition of the liquid detergent composition for tableware may be diluted or concentrated.

  In the tableware cleaning method of the present invention, the liquid detergent composition for tableware is foamed and brought into contact with a hard surface, and then left without applying mechanical force (not applied). That is, there is a cleaning method in which contact is made without using a flexible material such as sponge or fingers, and the device is left as it is without applying mechanical force. After standing, it is usually rinsed with water. When rinsing, mechanical force (physical force) may be applied by hand, etc., or simply rinsing with a water flow.

In the tableware cleaning method of the present invention, the liquid detergent composition for tableware is foamy, preferably 0.1 g or more, more preferably 0.3 g with respect to 100 cm ² of the hard surface area that is the object. More preferably, it is 0.4 g or more, and preferably 5 g or less, more preferably 3 g or less, and still more preferably 2 g or less.

In the tableware cleaning method of the present invention, from the viewpoint of enhancing the detergency, the liquid detergent composition for tableware is preferably 10 seconds or more, more preferably 20 seconds or more, still more preferably after contacting the hard surface in the form of foam. Is 30 seconds or more, more preferably 40 seconds or more, and from the same viewpoint, preferably 60 minutes or less, more preferably 30 minutes or less, still more preferably 20 minutes or less, even more preferably 10 minutes or less, and even more Preferably it is left for 5 minutes or less. In this case, the time when the composition first comes into contact with the tableware surface may be set as the start of leaving.
In addition, the temperature at the time of leaving may be room temperature, for example, 10 degreeC or more and 30 degrees C or less are mentioned.

  In the tableware cleaning method of the present invention, from the viewpoint of enhancing the cleaning power, it is preferably 10 seconds or more, more preferably 20 seconds or more, still more preferably 30 seconds or more, still more preferably 40 seconds or more, and still more preferably 60. Seconds or more, more preferably 2 minutes or more, and from the same viewpoint, preferably 60 minutes or less, more preferably 30 minutes or less, still more preferably 20 minutes or less, even more preferably 10 minutes or less, even more preferably 5 For a minute or less, the foamy liquid detergent composition for tableware is brought into contact with the tableware surface to be cleaned.

In the tableware cleaning method of the present invention, the surface of the tableware to which oily dirt, preferably oily dirt containing solid fat is attached, may be immersed in the foamy liquid detergent composition for tableware, From the viewpoint of efficiently increasing the cleaning power, there is a method in which the liquid detergent composition for tableware is sprayed or applied in the form of foam and brought into contact with the surface of the tableware to which oil stains, preferably oil stains containing solid fats are adhered. preferable.
The method for bringing the liquid detergent composition for tableware into contact with the surface of the tableware to which oil stains, preferably oil stains containing solid fats are attached, is a method of applying in a foam form. Specifically, it is preferable to use a tableware detergent product using a spray means, that is, a container (spray container) having a sprayer filled with a liquid detergent composition for tableware used in the present invention.
The present invention relates to a liquid detergent composition for tableware containing a surfactant and water, wherein the composition comprises (I) an initial foam specific volume (ml / g) of 20 to 50, and (II) 5 minutes. Provided is a liquid detergent product for tableware, which is housed in a spray container that is discharged with foam having a foam specific volume (ml / g) of 10 or less.
In the liquid detergent product for tableware of the present invention, the matters described in this specification can be appropriately applied to the liquid detergent composition for tableware and the spray container.

  Examples of the container (spray container) provided with the sprayer include a trigger spray container, a manual spray apparatus that does not use a propellant such as a pump spray container, and an aerosol that uses a propellant. The container having the sprayer is preferably a trigger type spray container that can be applied in the form of foam, and more preferably a trigger type spray container having a mechanism for forming bubbles (foam forming mechanism).

  Moreover, in the detergent product for tableware with a spray container, when using a trigger type spray equipped with a foam formation mechanism, a foam cylinder is attached to the ejection nozzle, and the content liquid ejected from the ejection hole by the ejection operation of the ejector is A foam discharge container that discharges in a foamed state by colliding with the inner wall surface of the foam cylinder is preferable. As its detailed structure, the one described in JP-A No. 2007-167719 can be referred to. Here, the amount of air mixed with the surfactant can be adjusted by adjusting the amount of air entering from the air introduction hole constituting the foamed cylinder, and the foam specific volume at the time of foam application can be adjusted. That is, by increasing the amount of air introduced into the liquid detergent composition, a foam having a large foam specific volume can be obtained.

When using a trigger spray with a foam formation mechanism, the spray container dishwashing article is preferably 0.4 mL or more, more preferably 0.6 mL or more, and preferably 10 mL in a single operation. Hereinafter, more preferably 5 mL or less, still more preferably 3 mL or less, still more preferably 1.5 mL or less of the composition is sprayed.
That is, in one operation, it is preferably 0.4 g or more, more preferably 0.6 g or more, and preferably 10 g or less, more preferably 5 g or less, still more preferably 3 g or less, and even more preferably 1.5 g or less. Spray the composition.

  The container of the said detergent for tableware containing a spray container can use the container generally used. For example, polyethylene, polypropylene, or polyethylene terephthalate is obtained as a raw material, and can be manufactured by blow molding or the like. The wall thickness of the container may be different from the bottom and side surfaces, preferably 0.01 to 2 mm, and the capacity of the container is preferably 100 to 1000 mL. The amount of the liquid detergent composition for tableware filled in the container is preferably 200 to 500 mL for handling. In addition, the filling of the liquid is performed leaving a common sense gap.

  The tableware cleaning method of the present invention is preferable as a method for cleaning tableware and hard surfaces of hard articles around kitchens, and further hard surfaces of tableware. Moreover, it is preferable as a hand washing washing method of the hard surface of tableware and hard articles around the kitchen, and further as a hand washing washing method of the hard surface of the tableware.

In the present invention, the tableware can include a hard article around the kitchen in addition to the tableware itself.
Hard articles around the kitchen are articles used around the kitchen, specifically,
(1) Food storage such as refrigerators and cupboards, tableware, cooking utensils storage location, and (2) food cooking locations such as drains, countertops, range hoods, sinks, gas ranges, microwave ovens,
It is. In the present invention, these are referred to as “hard articles around the kitchen” for convenience.
As tableware, specifically,
(I) so-called tableware such as dishes and bowls,
(Ii) Storage containers such as tappers and bottles,
(Iii) Cooking utensils such as knives, cutting boards, pans, frying pans, grilled fish,
(Iv) Examples include members and utensils that come into contact with foodstuffs such as food processors and cooking appliances such as mixers. In the present invention, these are referred to as “tableware” for convenience.
In addition, examples of the material of the tableware to be cleaned according to the present invention include plastic (including silicone resin), metal, ceramics, wood, and combinations thereof.

In addition, the tableware cleaning method of the present invention is preferably intended for hard surfaces of articles selected from tableware, storage containers, cooking utensils, and cooking appliances, and further includes dishes, bowls, tappers, bottles, kitchen knives, cutting boards, More preferably, the object is a hard surface of an article selected from a pan, a frying pan, a grilled fish, a food processor, and a mixer.
And the cleaning method of the tableware of this invention can wash | clean effectively the oil stains which adhered to these hard surfaces, Preferably the oil stain containing a solid fat.

In the tableware cleaning method of the present invention, the liquid detergent composition for tableware used in the present invention is foamed and directly brought into contact with a hard surface. And since it is sufficient to leave the composition in contact, it is not necessary to apply mechanical force such as scrubbing with a flexible material such as sponge during cleaning.
Therefore, the tableware cleaning method of the present invention is
(1) Hard articles that are inconvenient to wash by hand such as water bottles, tumblers, kettles, pots, etc.
(2) A hard surface with a wide range of oil stains including solid fats around the kitchen such as food, tableware, cooking utensils storage area, cooking table, range hood, sink, gas range, microwave oven, etc. Having an article,
(3) Flexible materials such as sponges, such as kitchen knives, peelers, graters, slicers, juicer blades, food processor blades and other dangerous items, and (4) items with complicated shapes. The present invention can also be applied to articles that are difficult to clean using materials. In the present invention, the hard surface may be washed without applying mechanical force, and then rubbed if necessary.
Since the present invention is excellent not only in the hard member part that can be reached, but also in the part that is out of reach and the details that are difficult to reach, the article that is the object of the cleaning method of the present invention is (1) to (4) ) Which are dangerous for hand-washing, articles which are inconvenient for hand-washing, and articles having complicated parts are preferred.
Furthermore, in the tableware cleaning method of the present invention, the liquid detergent composition for tableware is foamed, applied to the surface of the tableware and left as it is, so that the composition can be kept on the surface of the tableware for a long time.
The tableware washing method of the present invention comprises a step of rinsing the surface of the dish contacted with the dishwashing liquid detergent composition with foam, preferably the dishwashing liquid detergent composition with foam. A step of rinsing the contacted tableware surface with water after standing may be included.

Using the following blending components, a liquid detergent composition for tableware shown in Table 1 was prepared, and the following items were evaluated. The results are shown in Table 2.
The liquid detergent composition for tableware of Table 1 was prepared by a conventional method. That is, a surfactant, a solvent, and other components excluding component (a) are added to an appropriate amount of ion-exchanged water, dissolved at room temperature (25 ° C.), and then added with sodium hydroxide and / or hydrochloric acid to adjust the pH. After adjusting (25 degreeC) to the value shown in Table 1, (a) component was mix | blended and stirred and the prescription was prepared. In addition, all the mass% of the mixing | blending component in Table 1 is a numerical value based on an effective part. (A) The component has shown the mass% based on a sodium salt.

<Blending ingredients>
[Surfactant]
Component (a) Sodium di-2-ethylhexyl sulfosuccinate (product name “Airol CT-1L” manufactured by Toho Chemical Industry Co., Ltd.) In general formula (a1), R ^1a and R ^2a are both 2-ethylhexyl groups, x, y: both 0, M ¹ : sodium compound (b) component lauryl hydroxysulfobetaine: N-dodecyl-N, N-dimethyl-N- (2-hydroxysulfopropyl) ammonium sulfobetaine (product name “Amphithol”) 20HD ", manufactured by Kao Corporation
Component (c) 2-ethylhexyl glyceryl ether (product name “GE-EH”, manufactured by Kao Corporation, in general formula (c1), R ^1c : 2-ethylhexyl group, r: 0 compound)

〔solvent〕
・ Propylene glycol (Product name “Propylene glycol”, manufactured by Asahi Glass Co., Ltd.)
・ Diethylene glycol monobutyl ether (product name “BDG”, manufactured by Nippon Emulsifier Co., Ltd.)

[Other ingredients]
・ Citric acid (Product name “Purified citric acid (anhydrous)”, manufactured by Fuso Chemical Industry Co., Ltd.)
・ P-Toluenesulfonic acid monohydrate (Product name “PTS M-7000”, manufactured by Meiyu Sangyo Co., Ltd.)

(1) Measurement of specific volume of foam The composition shown in Table 1 was sprayed with spray 1 (spray using a trigger of mold killer (manufactured by Johnson Co., Ltd., Lot. 207UB, sold in 2002)), spray 2 (magiclin handy) Each was filled with a spray (spray using a trigger of Kao Corporation, Lot. W0442904, sold in 2016).
The mass (g) of a plastic 200 ml graduated cylinder with an inner diameter of 3.5 mm was measured with a lower two-digit balance (a). From each spray, the composition was discharged into a foam by pulling a trigger 5 times into a 200 ml graduated cylinder, and 10 seconds after the discharge, the weight (g) of the 200 ml graduated cylinder and the foam was measured with a lower two-digit balance ( b) Also, the volume (ml) of foam in the graduated cylinder was measured (c). Furthermore, after discharging foam with a spray, it was allowed to stand for 5 minutes, and then the volume (ml) of foam in the graduated cylinder was measured (d).
Using the following formula, (I) initial foam specific volume and (II) foam specific volume after 5 minutes were calculated.
(I) Bubble specific volume (ml / g) = (c) / {(b) − (a)} in the initial stage (10 seconds after foam discharge)
(II) Foam specific volume after 5 minutes (ml / g) = (d) / {(b)-(a)}

(2) Detergency evaluation (cleaning object kit with unevenness)
What mixed beef tallow and rapeseed oil by the mass ratio of 9: 1 was created, and it was set as model dirt (model dirt of oil dirt containing solid fat, and so on).
There are many rugged dishes such as juicer mixers, food processors, water bottle lids, etc., which are difficult to clean because they are not rubbed or difficult to rub with sponges. This time, we created a cleaning object kit with unevenness, assuming dishware with such unevenness, and evaluated the cleaning power.
Remove the hemispherical wire mesh (18-8 stainless steel 40 mesh, circular metal frame with an inner diameter of about 55 mm) of the handy powder sieve (made by Ceria Co., Ltd.), and open the wire mesh at the opening of a 100 ml beaker (inner diameter of about 55 mm). Was used as a cleaning object kit with projections and depressions (the wire mesh portion was regarded as a convex portion and the beaker bottom was regarded as a concave portion).
The mass (g) of the wire mesh was measured with a lower 4-digit balance (e). 0.07 to 0.12 g of the model stain was uniformly applied to the wire mesh, and the mass (g) of the wire mesh coated with the model stain was measured with a lower 4-digit balance (f). Further, the mass (g) of a 100 ml beaker was measured with a lower four-digit balance (h). 0.04 to 0.06 g of model soil was uniformly applied to the bottom of the 100 ml beaker, and the mass (g) of the 100 ml beaker coated with the model soil was measured with a lower 4-digit balance (i).

The composition filled in each spray from the upper part of the wire mesh of the object mesh kit with unevenness coated with model dirt from 5 cm above is discharged in the form of foam by pulling the trigger twice, and after standing for the time shown in Table 2, 1 Rinsing with tap water for a minute. At this time, the conditions of rinsing with running water were a tap water temperature of 25 ° C., a flow rate of 4 L / min, and a faucet opening diameter of about 15 mm. Hold the tap water so that it touches the metal frame part of the wire mesh of each cleaning object kit at a position 5cm vertically from the opening of the faucet, and draw a circle horizontally along the metal frame part. Poured into. When the inside of the 100 ml beaker under the metal mesh was filled with tap water, the process of draining the kit upside down was continuously performed for 1 minute. After rinsing, the kit was dried, and the mass (g) of the wire mesh portion was measured using a 4-digit balance (j). At the same time, the mass (g) of a 100 ml beaker was measured using a 4-digit balance (k).
Using the following equation, the cleaning rate of the wire mesh (convex portion) and the beaker bottom portion (concave portion) was determined.
Washing rate (%) of wire mesh (convex part) = {(f) − (j)} / {(f) − (e)} × 100
Cleaning rate (%) of beaker bottom (recessed portion) = {(i) − (k) / (i) − (h)} × 100

(Discussion)
From the comparison between Example 1 and Comparative Example 1, in the cleaning method of the present invention, since the initial foam specific volume is large, the cleaning power of the convex portion (wire mesh) is high, and the bubbles disappear as time passes. Since it turns into a liquid and flows into a recessed part, it turns out that it is excellent also in the cleaning power of a recessed part (beaker bottom part). Therefore, it can be seen that the cleaning method of the present invention is an excellent cleaning method not only for a hard member that can be reached but also for a portion that cannot be reached.

Claims (15)

  Prepared from a liquid detergent composition for tableware containing a surfactant and water, (I) initial foam specific volume (ml / g) of 20 to 50 and (II) foam specific volume after 5 minutes A method for washing dishes, wherein a foam having a (ml / g) of 10 or less is brought into contact with the surface of a dish on which oil stains adhere and is washed without applying mechanical force.   The method for washing tableware according to claim 1, wherein the foam has a specific volume (ml / g) of 20 to 50.   The method for washing tableware according to claim 1 or 2, wherein a ratio (I) / (II) of (I) initial foam specific volume and (II) foam specific volume after 5 minutes is 5 or more and 20 or less.   The washing | cleaning method of the tableware of Claims 1-3 in which surfactant contains (a) anionic surfactant (henceforth (a) component).   The washing | cleaning method of the tableware in any one of Claims 1-4 in which surfactant contains (b) amphoteric surfactant (henceforth (b) component).   The method for cleaning tableware according to any one of claims 1 to 5, wherein the surfactant contains (c) a nonionic surfactant (hereinafter referred to as component (c)).   In the liquid detergent composition for tableware, (a) component and (b) component are contained, The mass ratio (b) / (a) of (a) component and (b) component is 0.1 or more, Item 7. A method for washing tableware according to item 5 or 6.   The method for cleaning tableware according to any one of claims 1 to 7, wherein in the liquid detergent composition for tableware, the content of the surfactant is 1% by mass or more and 20% by mass or less.   The method for washing tableware according to any one of claims 1 to 8, wherein the liquid detergent composition for tableware contains a solvent.   The method for washing tableware according to claim 9, wherein the solvent is at least one selected from ethanol, propylene glycol, ethylene glycol monobutyl ether, propylene glycol monobutyl ether, diethylene glycol monobutyl ether, and dipropylene glycol monobutyl ether.   The washing | cleaning method of the tableware of Claim 9 or 10 whose content of a solvent is 2 to 30 mass% in the liquid detergent composition for tableware.   The washing | cleaning method of the tableware of Claims 1-11 whose foam is what was discharged using the spray means.   The method for washing tableware according to claim 1, wherein the oil stain is an oil stain containing solid fat.   The method for cleaning tableware according to any one of claims 1 to 13, wherein the liquid detergent composition for tableware is brought into contact with a hard surface for 30 seconds to 10 minutes. A liquid detergent composition for tableware containing a surfactant and water, the composition comprising (I) an initial foam specific volume (ml / g) of 20 to 50 and (II) a foam ratio after 5 minutes A liquid detergent product for tableware, which is housed in a spray container that discharges with a foam having a volume (ml / g) of 10 or less.