JP2002285198A - Detergent composition for continuous washing machine and washing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a detergent composition and a washing method for a laundry, in particular the laundry including large amounts of solid components, for example, dispers, by using a continuous washing machine equipped with a plurality of washing tanks for washing/rinsing where 1/3 or more number of the tanks have each a water-feeding and water-draining devices. SOLUTION: A detergent composition including a water-soluble organic divalent metal ion-trapping agent and nonionic detergent is charged into these washing tanks so that the charge into the first washing tank may become maximum.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a cleaning composition and a cleaning method suitable for a continuous washing machine used in the field of linen supply. In particular, the present invention relates to a cleaning composition and a cleaning method for cleaning diapers called a diaper.

[0002]

2. Description of the Related Art Diapers have conventionally been washed with a batch type washing machine. However, with the aging of society, the number of nursing care facilities has increased, and the number of items to be washed has increased sharply, and washing has been performed using a continuous washing machine that can process a large amount of items to be washed. It has become However, when a conventional continuous washing machine is used to wash an object containing a large amount of solids, such as a diaper, dirt remains in the tub because drainage can be performed only once in the main washing, and the next washing operation is performed. There has been a problem that when the articles are transferred, they have an adverse effect on the washing of the articles to be washed. In order to solve this problem, a continuous washing machine in which a plurality of water injection / drainage mechanisms are installed in a washing tub has recently appeared. However, using the same washing conditions as the conventional continuous washing machine (for example, the method described in JP-A-11-229271), a continuous washing machine in which a plurality of water injection / drainage mechanisms are installed in a washing tub is used. When washing is performed while performing water injection and drainage, there has been a problem that sufficient washing performance is not exhibited.

[0003]

DISCLOSURE OF THE INVENTION The present invention relates to a method for performing washing while performing water injection / drainage by using a continuous washing machine in which a plurality of water injection / drainage mechanisms are installed in a washing tub. It is an object of the present invention to provide a detergent composition and a cleaning method that exhibit excellent detergency for an object to be washed containing a solid content.

[0004]

Means for Solving the Problems The inventors of the present invention have made intensive studies to solve the above-mentioned problems, and as a result, the amount of a cleaning composition having a specific composition to be introduced into the first tank in the main cleaning is maximized. And found that an excellent detergency can be obtained by adding it to the present invention.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS That is, the present invention provides a continuous washing machine having a plurality of washing tubs for washing / rinsing, wherein at least one third of the washing tubs are provided with a water injection / drainage mechanism. A cleaning agent used in the used cleaning, which is supplied so that the amount of the main cleaning to be supplied to the first tank is maximized.
A detergent composition for a continuous washing machine, comprising a water-soluble organic divalent metal ion scavenger and B) a nonionic surfactant. In addition, when washing with a plurality of washing tubs that perform washing and rinsing, when washing with a continuous washing machine in which a water injection / drainage mechanism is installed in one-third or more of the washing tubs,
In the cleaning process consisting of the pre-cleaning, main cleaning, and rinsing steps, the detergent is supplied so that the amount of the detergent in the first tank of the main cleaning is maximized, and the cleaning is performed continuously while performing water injection and drainage. Is a cleaning method.

Hereinafter, embodiments of the present invention will be described in detail. The continuous washing machine used in the present invention is a washing machine that includes five or more washing tubs, and includes a pre-washing, a main washing, and a rinsing process from an upstream side to a downstream side in which articles to be washed flow downstream.
This washing tank is equipped with a mechanism that allows water injection and drainage. The water supplied to the rinsing tank flows in a direction opposite to that of the object to be washed, but can be drained in a tank on the way. Generally, the washing machine divides a horizontal cylindrical container into 5 to 14 spaces, performs 1 to 3 tanks for preliminary cleaning, and 2 to 7 tanks for main cleaning.
The tank and the rinsing are configured to be 2 to 6 tanks. Specific examples of such a continuous washing machine include a CR type machine manufactured by Mitsubishi Heavy Industries, Ltd., and an LCBW manufactured by Tokyo Seimaku Machinery Co., Ltd.
Mold machine, CBW machine, PWZ machine manufactured by Asahi Seisakusho Co., Ltd., and the like. In the present invention, washing in a washing tub that performs a heating operation at 40 to 80 ° C. is referred to as main washing, the preceding step is referred to as preliminary washing, and the subsequent step is referred to as rinsing.

The water-soluble organic divalent metal ion scavenger of component A) used in the present invention includes nitrilotriacetate, ethylenediaminetetraacetate, β-alanine diacetate, aspartate diacetate, and methylglycine diacetate. And aminocarboxylates such as iminodisuccinate; hydroxyaminocarboxylates such as serine diacetate, hydroxyiminodisuccinate, hydroxyethylethylenediamine triacetate and dihydroxyethylglycine; hydroxyacetate, tartrate and citric acid Hydroxycarboxylates such as salts and gluconates; cyclocarboxylates such as pyromellitic acid salts, benzopolycarboxylates and cyclopentanetetracarboxylates; carboxymethyltaltronate, carboxymethyloxysuccinate, oxydiacid Succinate, tartaric acid mono Or ether carboxylate such as disuccinate; polyacrylic acid, acrylic acid-allyl alcohol copolymer, water-soluble acrylic acid-maleic acid copolymer, hydroxyacrylic acid polymer, polysaccharide-acrylic acid copolymer, etc. Acrylic acid polymer and copolymer; maleic acid, itaconic acid, fumaric acid, tetramethylene 1,2-
Polymers or copolymers such as dicarboxylic acid, succinic acid, and aspartic acid; polysaccharide oxides such as starch, cellulose, amylose, and pectin; and polysaccharides such as carboxymethyl cellulose. Among these organic divalent metal ion scavengers, citrate, aminocarboxylate,
Polyacrylates and water-soluble acrylic acid-maleic acid copolymers are preferred. In particular, nitrilotriacetate,
Aminocarboxylates such as ethylenediaminetetraacetate, β-alaninediacetate, aspartate diacetate, methylglycinediacetate and iminodisuccinate are preferred. Aminocarboxylates such as nitrilotriacetate, ethylenediaminetetraacetate, β-alanine diacetate, aspartate diacetate, methylglycine diacetate and iminodisuccinate are usually used alone or in combination of two or more. It is preferably used in an amount of 5 to 60% by weight, particularly preferably 10 to 50% by weight, in the detergent composition in order to impart sufficient detergency.

The following nonionic surfactants are used as the component B) in the present invention. (1) Ethylene oxide / propylene oxide adducts of higher alcohols As higher alcohols, naturally-occurring coconut alcohol or palm kernel oil alcohol, or a condensed fraction of these alcohols, or α-methyl branched primary alcohol which is a synthetic alcohol. Isotridecyl alcohol derived from the contained dovanol or diadol, sophthanol which is a linear secondary alcohol, butene dimer or trimer having a multi-branched chain, or trimer or pentamer of propylene And the like. The average number of moles of ethylene oxide and propylene oxide added is 3 to 3 of ethylene oxide.
0, a range of 1 to 10 propylene oxide, preferably 4 to 25 ethylene oxide, and a range of 1 to 7 propylene oxide, particularly 4 to 1 ethylene oxide.
5, the range of propylene oxide 1 to 5 is preferred.
Those in the above range are excellent in the foam suppressing effect. Of the above, particularly preferred is a block adduct of ethylene oxide and propylene oxide with propylene oxide added to the terminals.

(2) Ethylene oxide adduct of higher alcohol (polyoxyethylene alkyl or alkenyl ether) Examples of higher alcohol include naturally-occurring coconut alcohol, palm kernel oil alcohol, conon which is a partial fraction thereof, and synthetic alcohol. Dovanol or diadol containing an α-methyl branched primary alcohol, sophthanol which is a linear secondary alcohol, a dimer or trimer of butene which is a primary alcohol having a multi-branched chain, or 3 to 5 of propylene And isotridecyl alcohol derived from the monomer. The average number of moles of ethylene oxide added is in the range of 3 to 30, preferably 4 to 25, and particularly preferably 4 to 15.

(3) A fatty acid ester type nonionic surfactant represented by the following chemical formula 1.

Embedded image (Wherein, R 1 has 5 to 21 carbon atoms, preferably 9 to 9 carbon atoms)
An alkyl or alkenyl group of 17 and R2 has 2 carbon atoms
And ethylene oxide alone or a mixture of ethylene oxide and propylene oxide is added to form OR2. R3 is an alkyl group having 1 to 4 carbon atoms, preferably 1 to 2 carbon atoms. Represents an average number of moles of OR2 added, and represents a number of 5 to 30, preferably 5 to 20. )

(4) A fatty acid alkanolamide having an average of 10 to 20 carbon atoms. (5) An alkylamine oxide having an average carbon number of 10 to 20. In the present invention, in particular, the ethylene oxide / propylene oxide adduct of the above-mentioned (1) higher alcohol is preferably used because of its excellent defoaming effect and detergency.

The component (B) of the present invention is preferably from 4 to
It is used in an amount of 40% by mass, more preferably 6 to 35% by mass. If the compounding amount of the compound (A) is less than 4% by mass, sufficient foam-suppressing property is not exhibited, and if the compounding amount exceeds 40% by mass, no further improvement in performance is observed. Absent.

In a preferred embodiment of the present invention, a bleaching agent can be used as follows. When a bleaching agent is added to the first main washing tank and / or the second main washing tank, the washing effect can be further enhanced. As the bleaching agent, hydrogen peroxide, hypochlorite and the like are used, and these are added as undiluted solutions or diluted to 1 to 50% by mass with water. The bleaching agent is preferably in the range of 0.04 to 1.0% by mass based on the material to be washed.

[0014] In addition to the above essential components, the following components can be added to the composition of the present invention, if necessary. 1) Anionic surfactants such as linear alkyl benzene sulfonate, alkyl sulfate, α-olefin sulfonate, α sulfo fatty acid alkyl ester salt 2) Soaps such as coconut oil fatty acid salt and oleate 3) Benzoic acid Salts, aromatic carboxylate or aromatic sulfonate such as benzene sulfonate, toluene sulfonate, xylene sulfonate 4) ethanol, isopropanol, butanol, 2-
Short-chain alcohols such as ethylhexanol 5) Glycols such as ethylene glycol, propylene glycol, polyethylene glycol and polypropylene glycol 6) Antibacterial agents such as isothiazolones and benzoisothiazolones 7) Antifoaming agents represented by silicones 8) Fluorescence enhancement Whitening agent 9) Enzymes such as protease, lipase, cellulase, amylase

The detergent composition of the present invention is used particularly for diaper washing, but can be used for other than diapers and can be applied to ordinary linen supplies. The detergent composition of the present invention is used in the range of 0.05 to 3.0% by mass based on the object to be washed.

[0016]

According to the present invention, the washing tub is provided with a plurality of water injections.
In washing by a continuous washing machine equipped with a drainage mechanism, excellent washing power can be exhibited, especially for a washing object containing a large amount of solids such as a diaper.

[0017]

Next, the present invention will be described with reference to examples.
The present invention is not limited by these examples.

Prior to the embodiment, an evaluation method will be described below. [Method of Detergency Evaluation] Blood-contaminated cloth (EMPA No. 11)
1: Three pieces of 5 cm x 5 cm (manufactured by EMPA) and three pieces of wet artificial soil cloth were sewn to a diaper to obtain an evaluation cloth. This was combined with another diaper to make it 50 kg, and was washed using a continuous washing machine (manufactured by Mitsubishi Heavy Industries, Ltd .: CR60, 7 tanks: FIG. 1), and the washing power was evaluated by the following equation (1).

## EQU1 ## Detergency (%) = ((reflectance of washed cloth−reflectance of uncleaned cloth) / (reflectance of original cloth−reflectance of uncleaned cloth)) ×
100

The description in the table is as follows. Nonion 1: Diadol 13 alcohol with 6 moles of ethylene oxide and 3 moles of propylene oxide added Nonion 2: coconut alcohol with 6 moles of ethylene oxide and 2 moles of propylene oxide Nonion 3: 23 moles of dovananol with 8 moles of ethylene oxide and 3 moles of propylene oxide Nonion 4: Diadol 13 alcohol obtained by adding 15 mol of ethylene oxide to 2 mol of propylene oxide Nonion 5: Diadol 13 alcohol obtained by adding 12 mol of ethylene oxide Scavenger 1: Acrylic acid maleic acid copolymer (average molecular weight: 50,000) BASF Sokaran CP7 Capture agent 2: Sodium nitrilotriacetate Capture agent 3: Sodium ethylenediaminetetraacetate Capture agent 4: Sodium citrate Fluorescent agent: Chromatography Co. Tinopal CBS CMC: carboxymethyl cellulose PEG: Polyethylene glycol (average molecular weight 600
0) Light ash: light sodium carbonate Granule ash: heavy sodium carbonate Glauber's salt: anhydrous sodium sulfate

[Examples 1 to 5] [Washing conditions] Detergent input amount and position: 0.16% by mass (hereinafter referred to as% owf) per object to be washed in first tank (pre-wash tank), second tank
0.56% owf in the tank (first washing tank), 0.31% owf in the third tank (second washing tank) ・ Hydrogen peroxide input: 0.35% owf in the second tank ・ Each tank Set temperature: 1st tank is not heated, 2nd tank is 80 ℃, 3rd
80 ° C. in the fourth tank, 80 ° C. in the fourth tank, no heating in the fifth tank, no heating in the sixth tank, no heating in the seventh tank ・ Yawing time: 300 seconds ・ Drainage / water injection was performed in the first tank, the second tank, In each of the third and fourth tanks, every turn, the rinsing zone was injected in the seventh tank, and the drainage was performed in the fifth tank.

[0021]

[Table-1]

Comparative Example 1 [Washing Conditions] Detergent input amount and position: 0.16% by mass (hereinafter referred to as% owf) in the first tank (pre-wash tank) per object to be washed, second
0.28% owf in the tank (first tank for main washing), 0.56% owf in the third tank (second tank for main washing). Hydrogen peroxide input: 0.35% owf in the second tank. Set temperature: 1st tank is not heated, 2nd tank is 80 ℃, 3rd
Tank 80 ° C, 4th tank 80 ° C, 5th tank is not heated, 6th tank is not heated, 7th tank is not heated. ・ Yawing time: 300 seconds Drainage / water injection is 1st tank, 2nd tank, 2nd tank In each of the third and fourth tanks, every turn, the rinsing zone was filled with water in the seventh tank, and drainage was performed in the fifth tank.

[0023]

[Table-2]

[Examples 6 and 7] [Method for evaluating detergency] Black stained cloth (5 cm, manufactured by EMPA)
× 5 cm) 3 pieces were sewn on a diaper to obtain an evaluation cloth. A continuous washing machine (made by Mitsubishi Heavy Industries, Ltd .: CR60, 7 tubs: Fig. 1) which is made up to 50 kg by combining this with other diapers
And the cleaning power was evaluated by the above equation (1). [Washing conditions] Detergent input amount and position: 0.16% by mass (hereinafter referred to as% owf) per object to be washed in the first tank (prewash tank), the second tank
0.56% owf in tank (first tank for main washing), 0.31% owf in third tank (second tank for main washing) << Detergent >> Diadol 13 alcohol ethylene oxide 7 mol propylene oxide 3 mol adduct: 10 mass % Soap: 5% by mass Na: ethylenediaminetetraacetic acid: 20% by mass Tinopearl CBX: 0.3% by mass Sodium carbonate: Balance ・ Hydrogen peroxide input: 0.35% owf in any tank ・ Set temperature of each tank: 1st No heating, 2nd tank 80 ℃, 3rd
Tank 80 ° C, 4th tank 80 ° C, No heating of 5th tank, No heating of 6th tank, No heating of 7th tank ・ Yawing time: 300 seconds ・ Drainage / water injection is 1st tank, 2nd tank, In each of the third and fourth tanks, every turn, water was injected into the rinsing zone in the seventh tank, and drainage was performed in the fifth tank.

[0025]

[Table-3]

[Comparative Example 2] [Method for evaluating detergency] Black stained cloth (5 cm, manufactured by EMPA)
× 5 cm) 3 pieces were sewn on a diaper to obtain an evaluation cloth. A continuous washing machine (made by Mitsubishi Heavy Industries, Ltd .: CR60, 7 tubs: Fig. 1) which is made up to 50 kg by combining this with other diapers
And the cleaning power was evaluated by the above equation (1). [Washing conditions] Detergent input amount and position: 0.16% by mass (hereinafter referred to as% owf) per object to be washed in the first tank (prewash tank), the second tank
0.21% owf in tank (first tank for main washing), 0.66% owf in third tank (second tank for main washing) << Detergent >> Diadol 13 alcohol ethylene oxide 7 mol propylene oxide 3 mol adduct: 10 mass % Soap: 5% by mass Na: ethylenediaminetetraacetic acid: 20% by mass Tinopearl CBX: 0.3% by mass Sodium carbonate: Balance ・ Hydrogen peroxide input: 0.35% owf in any tank ・ Set temperature of each tank: 1st No heating, 2nd tank 80 ℃, 3rd
Tank 80 ° C, 4th tank 80 ° C, No heating of 5th tank, No heating of 6th tank, No heating of 7th tank ・ Yawing time: 300 seconds ・ Drainage / water injection is 1st tank, 2nd tank, In each of the third and fourth tanks, every turn, water was injected into the rinsing zone in the seventh tank, and drainage was performed in the fifth tank.

[0027]

[Table-4]

[0028]

[Brief description of the drawings]

FIG. 1 is a schematic sectional view showing a continuous washing machine according to an embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 1st tank (prewash tank) 2 2nd tank (main wash 1st tank) 3 3rd tank (main wash 2nd tank) 4 4th tank (3rd main wash tank) 5 5th tank (1st rinse tank) 6) 6th tank (2nd rinsing tank) 7 7th tank (3rd rinsing tank) 8 New water input valve for 1st tank 9 New water input valve for 2nd tank 10 New water input valve for 3rd tank 11th New water input valve for 4 tanks 12 New water input valve for rinsing 13 Drain valve for 1st tank 14 Drain valve for 2nd tank 15 Drain valve for 3rd tank 16 Drain valve for 4th tank 17 Drain valve for rinsing 18 1st Detergent charging pump for tank 19 Detergent charging pump for second tank 20 Detergent charging pump for third tank 21 Bleach charging pump 22 Detergent dissolution tank 23 Bleach dilution tank

Continuation of the front page F term (reference) 3B155 AA01 AA03 AA17 AA18 AB00 BB08 CC04 MA03 4H003 AC23 EA12 EA16 EB08 EB15 EB16 EB32 EB36 EB42 FA04

Claims (2)

[Claims] 1. A washing machine comprising a plurality of washing tubs for washing and rinsing, wherein at least one-third of the washing tubs are used for washing using a continuous washing machine provided with a water injection / drainage mechanism. An agent which is supplied so as to maximize the amount of the main cleaning into the first tank, and which comprises: A) a water-soluble organic divalent metal ion scavenger and B) a nonionic surfactant. And a detergent composition for a continuous washing machine. 2. A washing machine comprising a plurality of washing tubs for washing and rinsing, wherein when washing is performed using a continuous washing machine provided with a water injection / drainage mechanism for at least one-third of the washing tubs, Pre-cleaning,
In the cleaning step including the main cleaning and rinsing steps, the cleaning is performed by introducing the detergent so that the amount of the detergent to be supplied to the first tank of the main cleaning is maximized, and performing continuous cleaning while performing water injection and drainage. Method.