JP2000096097A - Aqueous liquid cleanser - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an aqueous liquid cleanser having a high washing performance, not generating cloudiness, separation, or the like, and capable of exhibiting stable low foamability by mixing an alkali agent, a low foamable nonionic surfactant, a specific fatty acid (salt), a glycol and a builder in a specific ratio. SOLUTION: This aqueous liquid cleanser comprises (A) 0.5-50 wt.% of an alkali agent (for example, an amine such as monoethanolamine or an alkali metal hydroxide such as sodium hydroxide), (B) 0.1-25 wt.% of a low foaming nonionic surfactant (preferably polyoxyethylene-polyoxypropylene block polymer), (C) 0.1-30 wt.% (as a fatty acid) of the fatty acid of the formula: R-COOH (R is a 3-13C linear aliphatic hydrocarbon group or a 3-17C branched aliphatic hydrocarbon group) or its salt, (D) 0.1-30 wt.% of a glycol (preferably propylene glycol), and (E) 0.5-50 wt.% of a builder (for example, EDTA). The 1% aqueous solution (25 deg.C) of the aqueous liquid cleanser is pH 10 or larger.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to an aqueous liquid detergent suitable for an automatic washing machine.

[0002]

2. Description of the Related Art Automatic washing machines are used to wash a wide variety of dishes, cups, cans, bottles, plastic containers, shopping baskets, vehicles, floors, etc. Containers, tableware, food bottles, cans, and the like are often contaminated with food-derived fats, oils, proteins, starch, and the like. In addition, a large amount of oil and dirt adheres to other containers and shopping baskets.

[0003] For this reason, a surfactant, especially a nonionic surfactant, is used in combination with an alkali agent to solubilize dirt by a hydrolysis action, etc., to wash and remove the dirt, and to improve the oil detergency. Has been done. In the case of spray cleaning using an automatic cleaning machine, if there is much foaming of the surfactant,
Since the foam overflows and the discharge pressure of the spray device decreases, low foaming properties are required.

On the other hand, in general, aqueous liquid detergents using an alkali agent and a nonionic surfactant in combination cause turbidity and separation.
Due to poor stability, a solubilizing agent or the like is used in combination. For example,
JP-A-64-4226 discloses the use of a specific carboxylic acid as a solubilizing agent in a strong alkaline agent and a nonionic surfactant.

[0005] However, when the contents of the alkali agent and the nonionic surfactant and also the inorganic substance are increased, in the case of an automatic washing machine, the washing agent becomes cloudy even if a solubilizing agent is used under high-temperature washing conditions, or the sedimentation / separation occurs. Or detergency is reduced.

It is an object of the present invention to provide a stable, low-foaming aqueous liquid detergent having high washing performance and no turbidity or separation.

[0007]

The present invention provides (a) an alkali agent of 0.5 to 50% by weight, (b) a low-foaming nonionic surfactant of 0.1 to 25% by weight, and (c) a compound represented by the general formula (I). Fatty acid or salt thereof 0.1 to 30% by weight (as fatty acid) R-COOH (I) (wherein R is a straight-chain aliphatic hydrocarbon group having 3 to 13 carbon atoms or a branched-chain aliphatic chain having 3 to 17 carbon atoms) (E) represents a hydrocarbon group.) (D) An aqueous liquid detergent containing 0.1 to 30% by weight of glycols and (e) 0.5 to 50% by weight of a builder.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Examples of the alkaline agent (a) include amines such as monoethanolamine, diethanolamine and triethanolamine, alkali metal hydroxides such as sodium hydroxide and potassium hydroxide, sodium carbonate and potassium carbonate. And alkali metal silicates such as alkali metal carbonate, sodium silicate and potassium silicate.
(a) 0.5 to 0.5%
50% by weight (%), preferably 4 to 30%, more preferably 5 to 25%.

In the present invention, a low-foaming nonionic surfactant is used.
(b) means those which exhibit sufficient water-solubility or water-dispersibility and do not generate excessive foam when used for machine washing. Specifically, one or more selected from the following general formulas (II) to (VII) are preferable. HO- (PO) _x- (EO) _y- (PO) _z -H (II) HO- (EO) _a- (PO) _b- (EO) _c -H (III) (Formula (II), (III) ), EO represents an oxyethylene group, PO represents an oxypropylene group, x, z and b represent the average number of moles of propylene oxide added, and x + z ≦ 60, preferably
10 to 50, b ≦ 60, preferably 10 to 50, and y and a and c each represent an average addition mole number of ethylene oxide;
≦ 150, preferably 2 to 50, a + c ≦ 150, preferably 2 to 50, and each of x, y, z, a, b, and c is 0.
Indicates a number that exceeds R ¹ -O (EO) _n -R ² (IV) (In the formula (IV), R ¹ represents a linear or branched alkyl group having 1 to 24 carbon atoms, EO represents an oxyethylene group, n represents an average number of moles of ethylene oxide of 8 to 30, and R ² represents a linear or branched alkyl group having 1 to 18 carbon atoms. R ³ -O- (EO) _x- (PO) _y- (EO) _z -R ⁴ (V) (In the formula (V), R ³ and R ⁴ are the same or different and have 1 to 24 carbon atoms.
Represents a linear or branched alkyl group or a cycloalkyl group having 3 to 12 carbon atoms (however, R ⁴ also includes a hydrogen atom),
EO represents an oxyethylene group, and PO represents an oxypropylene group. x and z are each 1 or more, preferably 2 to 10, each indicating the average addition mole number of ethylene oxide, and y is a 1 to 4 number indicating the average addition mole number of propylene oxide. (EO) _x , (PO) _y , and (EO) _z are linked in this order. R ⁵ -O- (EO) _x- (PO) _y -R ⁶ (VI) R ⁵ -O- (EO) _x- (BO) _z -R ⁶ (VII) (Formulas (VI) and (VII) Wherein R ⁵ and R ⁶ are the same or different and represent a linear or branched alkyl group having 1 to 24 carbon atoms or a cycloalkyl group having 3 to 12 carbon atoms (however, R ⁶ also includes a hydrogen atom); EO represents an oxyethylene group, PO represents an oxypropylene group, and BO represents an oxybutylene group. x, y, and z each represent an average number of moles of ethylene oxide, propylene oxide, and butylene oxide, and are 1 to 20 respectively. ].

The component (b) is incorporated in the detergent in an amount of 0.1 to 25%, preferably 0.5 to 5%, more preferably 0.5 to 2%, from the viewpoint of oil detergency and solution stability.

The fatty acid represented by the general formula (I) or its salt (c) according to the present invention includes n-butyric acid, valeric acid, sorbic acid, caproic acid, caprylic acid, capric acid, lauric acid, myristic acid, Examples thereof include linear fatty acids such as undecanoic acid and salts thereof, and branched chain fatty acids such as isobutyric acid, 2-ethylhexanoic acid, isopalmitic acid and isostearic acid, and salts thereof. The component (c) is 0.1 to 30 as a fatty acid in the detergent because preferable solution stability is obtained.
%, Preferably 0.5 to 10%, more preferably 1 to 5%. The component (c) is usually present in the detergent as a salt neutralized by the component (a).

The glycols (d) include ethylene glycol, diethylene glycol, triethylene glycol, polyethylene glycol (Mw = 200 to 12000), propylene glycol, dipropylene glycol, tripropylene glycol, and polypropylene glycol (Mw = 60).
0 to 4000), 1,3-butanediol, 1,4-butanediol, polytetramethylene ether glycol (Mw = 650
~ 1000), 1,5-pentanediol, 2-methyl-2,4-pentanediol, 3-methyl-1,5-pentanediol, 1,6-
Hexanediol, 2-ethyl-1,3-hexanediol and the like can be mentioned. Particularly, propylene glycol and 1,4-butanediol are preferred. The component (d) is incorporated in the detergent in an amount of 0.1 to 30%, preferably 0.5 to 10%, and more preferably 1 to 5%, since a preferable solution stability can be obtained.

The builder (e) has chelating ability and excludes the alkali agent (a), and specifically includes ethylenediaminetetraacetic acid (EDTA), hydroxyethylethylenediaminetriacetic acid, diethylenetriaminepentaacetic acid, Nitrilotriacetic acid, triethylenetetramine hexaacetic acid, ethylene glycol bis (2-aminoethyl ether) tetraacetic acid, citric acid, maleic acid, silicic acid, gluconic acid, fumaric acid, hydroxybenzyliminodiacetic acid,
Examples include iminodiacetic acid, phosphoric acid, polyphosphoric acid, phosphonic acid, and salts thereof. In addition, oligomers or polymers (weight average molecular weight of 1,000 to several hundred thousand) such as polyacrylic acid, polymaleic acid, acrylic acid-maleic acid copolymer, and isoamylene-maleic acid copolymer can also be used. It may be salted. These polymer builders are excellent in dispersibility of scale components and the like. Salt is
Sodium, potassium, ammonium and alkanolamine salts. The component (e) has a preferable detergency and solution stability, so that 0.5 to
50%, preferably 1 to 30%, more preferably 5 to 10% is blended.

The aqueous liquid detergent of the present invention may further contain other additives, if necessary, such as bleaching agents, bactericides, preservatives, rust inhibitors, organic solvents, thickeners, fragrances, coloring agents, and acids. And the like can be appropriately compounded within a range that does not impair the effects of the present invention.

The aqueous liquid detergent of the present invention is prepared by mixing and stirring when each component is a liquid, and when containing a solid substance, first dissolving in water, then adding another liquid component and mixing and stirring. The order of addition and dissolution is not particularly limited depending on the composition.

The aqueous liquid detergent of the present invention preferably has a 1% by weight aqueous solution (25 ° C.) having a pH of 10 or more, particularly preferably 11 to 13.5.

[0017]

EXAMPLES Examples 1 to 6 and Comparative Examples 1 to 3 The aqueous liquid detergents shown in Table 1 were prepared. A detergent supply machine was installed on the DW-230L automatic dishwasher manufactured by Sanyo Electric Co., Ltd.
A cleaning agent was supplied from this supply machine, and a cleaning test was performed under the following conditions, and the cleaning property and the low foam property were evaluated based on the following criteria. The storage stability was also evaluated.

[I] Detergency ・ Cleaning conditions Cleaning temperature: 60 ± 2 ° C. Cleaning time: 45 seconds Detergent concentration: 0.15% Rinse time: 15 seconds Rinse temperature: 80 ± 2 ° C. A magnetic dish (diameter: 5 g per one piece of composite model soil (a mixture of protein, oil and starch)
(200 mm x 30 mm height) 4 sheets Washing target 2: 4 polypropylene dishes (200 mm diameter x 30 mm height) coated with 5 g of salad oil per sheet ・ Criterion ◎: Dirt was completely removed. ：: Almost all dirt was removed. Δ: Insufficient removal of dirt. X: Almost no dirt is removed.

[II] Low-foaming property 30 ml of a 1% aqueous solution of a detergent is placed in a test tube (length 25 mm, inner diameter 30 m)
m), the solution was heated to 40 ° C., shaken 20 times, and the foaming height after 10 seconds was measured. Criteria 基準: Foam amount is small (foaming height is less than 10 mm). ：: Foam amount is normal (foaming height is 10 mm or more and less than 20 mm). Δ: The foam amount was slightly large (foaming height 20 mm or more and less than 50 mm). ×: A large amount of foam (bubble height of 50 mm or more).

[III] Stability The detergent is stored under conditions of 40 ° C. × 30 days or −5 ° C. × 30 days,
The stability was evaluated.・ Criteria ○: Transparent (turbid, no separation) △: Slightly cloudy ×: Separated

[0021]

[Table 1]

Nonionic surfactant 1: a compound of x = 21, y = 14, z = 22 in the general formula (II) Nonionic surfactant 2: R ¹ = C ₁₂ in the general formula (IV) n = 1
2, compound of R ² = C ₈・ Nonionic surfactant 3: R ³ = C ₁₂ , x = 7 in the general formula (V)
, Y = 1.5, z = 7, compound of R ⁴ = C ₈・ Sodium polyacrylate (Mw 4000) ・ Caprylic acid: Lunac 8-98, manufactured by Kao Corporation, and the compounding amount is as fatty acid

[0023]

The aqueous liquid detergent of the present invention has excellent detergency, low foaming property and storage stability, and is suitable as an aqueous liquid detergent for an automatic washing machine that requires effective washing in a short time. is there.

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[Procedure amendment]

[Submission date] August 6, 1999 (1999.8.6)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Claims

[Correction method] Change

[Correction contents]

[Claims]

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (Reference) C11D 3:04 3:20 3:37) (72) Inventor Susumu Yamazawa 1334 Minato 1334 Minato, Wakayama-shi, Wakayama Kao Corporation Within the laboratory (72) Inventor Noboru Matsuo 1334 Minato, Wakayama, Wakayama Pref.

Claims (5)

[Claims] (1) an alkali agent: 0.5 to 50% by weight; (b) a low-foaming nonionic surfactant: 0.1 to 25% by weight; (c) a fatty acid represented by the general formula (I) or a salt thereof: 0.1 to 30% by weight. % (As fatty acid) R-COOH (I) (wherein, R represents a linear aliphatic hydrocarbon group having 3 to 13 carbon atoms or a branched aliphatic hydrocarbon group having 3 to 17 carbon atoms.) d) An aqueous liquid detergent containing 0.1 to 30% by weight of glycols (e) 0.5 to 50% by weight of a builder. 2. The aqueous liquid detergent according to claim 1, wherein the low-foaming nonionic surfactant is a polyoxyethylene-polyoxypropylene block polymer represented by the following general formula (II) or (III). HO- (PO) _x- (EO) _y- (PO) _z -H (II) HO- (EO) _a- (PO) _b- (EO) _c -H (III) (Formula (II), (III) ), EO represents an oxyethylene group, PO represents an oxypropylene group, x, z and b represent the average number of moles of propylene oxide added, x + z ≦ 60, b ≦ 60, and y, a, c Represents the average number of moles of ethylene oxide added, y ≦ 150, a + c ≦ 150, x,
Each of y, z, a, b, and c indicates a number exceeding 0. ] 3. The aqueous liquid detergent according to claim 1, wherein the low-foaming nonionic surfactant is a polyoxyethylene dialkyl ether represented by the following general formula (IV). R ¹ -O (EO) _n -R ² (IV) (in the formula (IV), R ¹ represents a linear or branched alkyl group having 1 to 24 carbon atoms, EO represents an oxyethylene group, n Represents a number of 8 to 30 representing an average addition mole number of ethylene oxide, and R ² represents a linear or branched alkyl group having 1 to 18 carbon atoms. ] 4. The aqueous liquid detergent according to claim 1, wherein the low-foaming nonionic surfactant is a polyoxyalkylene (di) alkyl ether represented by the following general formula (V). R ³ -O- (EO) _x- (PO) _y- (EO) _z -R ⁴ (V) (In the formula (V), R ³ and R ⁴ are the same or different and each have 1 to 24 carbon atoms.
Represents a linear or branched alkyl group or a cycloalkyl group having 3 to 12 carbon atoms (however, R ⁴ also includes a hydrogen atom),
EO represents an oxyethylene group, and PO represents an oxypropylene group. x and z are each 1 or more numbers indicating the average addition mole number of ethylene oxide, and y is a number of 1 to 4 indicating the average addition mole number of propylene oxide. (EO) _x , (PO) _y ,
(EO) _z is block-connected in this order. ] 5. The aqueous liquid detergent according to claim 1, wherein the low-foaming nonionic surfactant is a polyoxyalkylene (di) alkyl ether represented by the following general formula (VI) or (VII). R ⁵ -O- (EO) _x- (PO) _y -R ⁶ (VI) R ⁵ -O- (EO) _x- (BO) _z -R ⁶ (VII) (In formulas (VI) and (VII) , R ⁵ and R ⁶ are the same or different and each represent a linear or branched alkyl group having 1 to 24 carbon atoms or a cycloalkyl group having 3 to 12 carbon atoms (however, R ⁶ also includes a hydrogen atom); Represents an oxyethylene group, PO represents an oxypropylene group, and BO represents an oxybutylene group. x, y, and z each represent an average number of moles of ethylene oxide, propylene oxide, and butylene oxide, and are 1 to 20 respectively. ]