JP7309957B1 - Textile cleaning method - Google Patents

Abstract

The present invention provides a method for washing textiles, which is excellent in detergentability of textiles, especially sebum stains and mud stains adhering to textiles. A textile product is brought into contact with water and a powder detergent composition containing 5% by mass or more and 30% by mass or less of the following component (A) and 0.5% by mass or more of the following component (B), A method for washing a textile product, wherein washing is performed by applying an external force to the textile product together with the powder detergent composition present on the textile product. (A) Component: Anionic surfactant (B) Component: Anionic water-soluble polymer [Selection drawing] None

Description

The present invention relates to a method for washing textiles.

Washing methods for textile products such as clothes are roughly divided into two types: hand washing and machine washing using a washing machine or the like. In recent years, the popularity of washing machines in the Asian region tends to increase, but hand-washing is widely practiced due to detergency, economy, cultural background, washing awareness, and the like. In hand-washing, the operator can wash while checking the degree of dirt removal, so not only general dirt adhering to the fibers, but also dirt that is difficult to remove, such as organic dirt such as sebum dirt adhering to the collar, and socks It is also suitable for washing to remove inorganic dirt such as adhering mud. In hand-washing, many workers wash textiles with a detergent, for example, a washing liquid obtained by dissolving a powdered detergent in water.

In Patent Document 1, 1 to 25 parts by mass of a predetermined layered clay mineral (b) and 1 to 25 parts by mass of predetermined acid source particles (c) are contained in 100 parts by mass of base detergent particles (a). Disclosed are detergent granules in which a layer containing the layered clay mineral (b) and the acid source particles (c) are formed on the surface of the base detergent granules (a), and a detergent composition containing the detergent granules. ing.
Further, Patent Document 2 discloses laundry granules containing (a) a predetermined porous carrier and (b) a predetermined washing agent. Detergent compositions containing the laundry particles are then disclosed to be suitable for machine and hand washing operations.
In Patent Document 3, (a) a predetermined anionic surfactant, (b) a predetermined carboxylic acid, (c) one or more compounds selected from inorganic sulfates and inorganic halogen compounds are added in a predetermined content. 5. A powder detergent composition containing protease granules and cellulase granules in predetermined amounts and having a pH of 2.5 or more when diluted 300 times with water at 20°C; 5 or less, powder detergent compositions for hand washing are disclosed.
Patent Literature 4 discloses a method containing (a) a predetermined surfactant, (b) a predetermined builder system, and (c) an alkalinity system comprising a predetermined carbonate in predetermined contents. Detergent compositions suitable for work laundering are disclosed.

JP 2010-189488 A Japanese Patent Publication No. 11-512483 WO2015/098265 Japanese Patent Publication No. 2001-520266

Washing by hand is a work accompanied by great physical and mental fatigue, and workers desire to be able to finish the work as quickly as possible.
Therefore, there is a demand for further improvement in the detergency of stains that are difficult to remove, such as organic stains such as sebum stains on collars and inorganic stains such as mud on socks. Even if such hard-to-remove stains are sufficient for cleaning the textile products, the areas where the stains remain are conspicuous, which may impair satisfaction with the finish of the textile products.
The present invention provides a method for washing textiles, which is excellent in washing properties of textiles, especially sebum stains and mud stains adhering to textiles.

In the present invention, a textile product is contacted with water and a powder detergent composition containing 5% by mass or more and 30% by mass or less of the following component (A) and 0.5% by mass or more of the following component (B), The present invention relates to a method for washing textiles, wherein washing is performed by applying an external force to the textiles together with the powder detergent composition present on the textiles.
(A) component: anionic surfactant (B) component: anionic water-soluble polymer

ADVANTAGE OF THE INVENTION According to this invention, the washing|cleaning method of the textiles which is excellent in the washing|cleaning property of a textiles, especially the sebum dirt and the mud dirt which adhered to the textiles is provided.

Surprisingly, the present invention provides a cleaning liquid obtained by dissolving substantially the entire amount of the powder detergent composition, rather than washing the textiles, the textiles containing water together with the powder detergent composition present on the textiles. It has been found that washing by applying an external force to the fiber product improves the washability of the textile product.
The reason why the method for washing textiles of the present invention improves the washability of textiles, particularly sebum stains and mud stains adhering to textiles, is not entirely clear, but is presumed as follows.
It is presumed that the effect of the present invention is exhibited because the dispersibility of solid stains such as sebum stains and mud stains and the effect of preventing re-staining are improved by allowing the component (B) to act on the textile product at a high concentration. .
More specifically, solid dirt inside the textile product is less likely to be subjected to mechanical force during washing, and tends to remain inside the textile product. Therefore, in the cleaning method of the textile product of the present invention, the polymer is drawn into the gap between the textile product and the solid dirt by applying an external force after the component (B) is brought into contact with the textile product at a high concentration. It is believed that contact between the water and the polymer by then rinsing the fabric with water causes the polymer to swell and act to pull the fabric away from the solid soil. Furthermore, since such polymers have a high affinity with solid soil, it is believed that rinsing with water will wash away the solid soil along with the polymer. As a result, the cleaning method for textile products of the present invention has the excellent effect of being able to remarkably clean various stains attached to fibers, organic stains such as sebum stains attached to collars, and inorganic stains such as mud attached to socks. is thought to be expressed.
It should be noted that the method for washing textiles of the present invention is not limited to the above action mechanism.

The method for cleaning a textile product of the present invention comprises a powder detergent composition containing water, 5% by mass or more and 30% by mass or less of the following component (A), and 0.5% by mass or more of the following component (B) in the textile product. and are brought into contact with each other, and an external force is applied to the textile product together with the powder detergent composition present on the textile product to wash the textile product.
(A) component: anionic surfactant (B) component: anionic water-soluble polymer

<Powder detergent composition>
First, the powder detergent composition used in the method for washing textiles of the present invention will be described in detail. The powder detergent composition of the present invention is a powder detergent composition for textile products, a powder detergent composition for textile products for application cleaning, and a powder detergent composition for textile products for application hand washing. good. In the present invention, the application washing may be washing by bringing the powder detergent composition into direct contact with the textiles.
The powder detergent composition of the present invention contains the above components (A) and (B).

(A) Component is an anionic surfactant. Specific examples of the component (A) include one or more anionic surfactants selected from the following components (a1), (a2), (a3) and (a4).
(a1) component: alkyl or alkenyl sulfate ester salt (a2) component: polyoxyalkylene alkyl or alkenyl ether sulfate salt having an alkyleneoxy group (a3) component: anionic surfactant having a sulfonate group (a4) component: Fatty acids having 12 to 24 carbon atoms or salts thereof

Component (a1) is, specifically, one or more anions selected from alkyl sulfate salts having an alkyl group having 10 to 18 carbon atoms and alkenyl sulfate salts having an alkenyl group having 10 to 18 carbon atoms. Surfactants are included. From the viewpoint of detergency, the component (a1) is preferably one or more anionic surfactants selected from alkyl sulfate ester salts having an alkyl group having 12 to 14 carbon atoms, and an alkyl group having 12 to 14 carbon atoms. One or more anionic surfactants selected from the following sodium alkyl sulfates are more preferred.

Specifically, the component (a2) is a polyoxyalkylene alkyl ether sulfate ester salt having an alkyl group having 10 to 18 carbon atoms and an alkylene oxide average addition mole number of 1 to 3 and an alkenyl group having 10 carbon atoms. One or more anionic surfactants selected from polyoxyalkylene alkenyl ether sulfate ester salts having an average number of added moles of alkylene oxide of 18 or less and 1 or more and 3 or less. The oxyalkylene group includes one or more groups selected from an oxypropylene group and an oxyethylene group. From the viewpoint of detergency, the component (a2) is preferably a polyoxyethylene alkyl ether sulfate ester salt having an average number of added moles of ethylene oxide of 1 or more and 2.2 or less, an alkyl group having 12 or more and 14 or less carbon atoms, and More preferred are polyoxyethylene alkyl ether sulfate ester salts in which the average number of moles of ethylene oxide added is 1 or more and 2.2 or less, and sodium salts thereof are even more preferred.

The anionic surfactant having a sulfonate group, which is the component (a3), represents an anionic surfactant having a sulfonate as a hydrophilic group.
Component (a3) specifically includes an alkylbenzenesulfonate having an alkyl group having 10 to 18 carbon atoms, an alkenylbenzenesulfonate having an alkenyl group having 10 to 18 carbon atoms, and an alkyl group having 10 to 18 carbon atoms. alkanesulfonates having 10 to 18 carbon atoms, α-olefin sulfonates having 10 to 18 carbon atoms in the α-olefin portion, α-sulfo fatty acid salts having 10 to 18 carbon atoms in the fatty acid portion, and One or more anionic surfactants selected from α-sulfo fatty acid lower alkyl ester salts having 10 or more and 18 or less carbon atoms and having 1 or more and 5 or less carbon atoms in the ester portion may be mentioned. From the viewpoint of washability, component (a3) is preferably an alkylbenzene sulfonate having an alkyl group having 11 to 16 carbon atoms, more preferably sodium alkylbenzene sulfonate having an alkyl group having 11 to 16 carbon atoms.

The component (a4) is a fatty acid having from 12 to 24 carbon atoms or a salt thereof. A fatty acid having 12 to 24 carbon atoms or a salt thereof is an anionic surfactant having an aliphatic hydrocarbon group having 11 to 23 carbon atoms as a hydrophobic group and a carboxylic acid or a salt thereof as a hydrophilic group. Component (a4) specifically includes lauric acid, myristic acid, palmitic acid, palmitoleic acid, stearic acid, oleic acid, elaidic acid, linoleic acid, linolenic acid and salts thereof.

Examples of the salt of the anionic surfactant that is the component (A) include alkali metal salts such as sodium and potassium, alkaline earth metal salts such as magnesium, and alkanolamine salts having 2 to 8 carbon atoms. Alkali metal salts are preferred, sodium or potassium salts are more preferred, and sodium salts are even more preferred.

From the viewpoint of detergency and foamability, the powder detergent composition of the present invention preferably contains one or more anionic surfactants selected from component (a3) as component (A). It is more preferable to contain one or more anionic surfactants selected from alkylbenzenesulfonates having 10 to 18 carbon atoms and alkenylbenzenesulfonates having 10 to 18 carbon atoms in the alkenyl group. It is more preferable to contain one or more anionic surfactants selected from alkylbenzene sulfonates having 10 to 18 carbon atoms.
In the powder detergent composition of the present invention, the ratio of the alkylbenzenesulfonate having an alkyl group of 10 to 18 carbon atoms is preferably 50% by mass or more in all components (A) contained in the detergent composition. , more preferably 60% by mass or more, still more preferably 70% by mass or more, and preferably 100% by mass or less.

The molecular weight of component (A) is preferably 100 or more, more preferably 200 or more, from the viewpoint of cleanability and foamability, and preferably 1,000 or less, more preferably 500 or less, and still more preferably from the viewpoint of cleanability. may be 400 or less.

Component (B) is an anionic water-soluble polymer. As the component (B), one type of polymer may be used alone, or multiple types of polymers may be used in combination. Component (B) may be an anionic dispersant polymer.

As used herein, the "water-soluble" water-soluble polymer means a polymer having a water-insoluble content of 0.5% or less as measured by the following method.

<Method for measuring water-insoluble content>
In a 1,000 mL beaker, 1 g of polymer is dissolved in 499 g of water at 25° C. with stirring for 5 hours. The resulting polymer aqueous solution is filtered using a pre-weighed mesh with an opening of 100 μm, and then washed with 500 mL of water at 25° C. from above. The residue is dried together with the mesh in a vacuum dryer at 120° C. for 6 hours, and the water-insoluble content is determined by the following formula (I).
Water-insoluble content (%) = [Amount of polymer residue after drying (g)] / [Amount of polymer when dissolved (g)] × 100 (I)

Examples of the anionic water-soluble polymer (B) include polymers containing monomer units having a carboxy group or a salt thereof, and polymers containing a monomer unit having a sulfonic acid group or a salt thereof. Among these anionic water-soluble polymers, polymers containing monomer units having a carboxyl group or a salt thereof are preferred from the viewpoint of affinity with solid dirt (especially mud particles).

Examples of the polymer containing a monomer unit having a carboxyl group or a salt thereof include polymers having a monomer unit derived from a carboxylic acid compound having a polymerizable unsaturated bond, such as acrylic acid, methacrylic acid and maleic acid, Natural polymers having sugar-derived monomer units having a carboxy group such as galagturonic acid and polymers obtained by carboxylating polysaccharides having sugar-derived monomer units such as cellulose can be mentioned. Specifically, polyacrylic acid, acrylic acid/maleic acid copolymer, acrylic acid/acrylamidomethylpropanesulfonic acid copolymer, styrene/maleic acid copolymer, olefin/maleic acid copolymer and their alkali metal Alternatively, alkanolamine salts having a molecular weight of 150 or less can be mentioned. Examples of natural or natural-derived polymers include xanthan gum, alginic acid, carboxymethyl cellulose (generally referred to as CMC), and their alkali metal or alkanolamine salts having a molecular weight of 150 or less.

As the alkali metal salt, sodium salt and potassium salt are preferable. Alkanolamine salts having a molecular weight of 150 or less include monoethanolamine salts, diethanolamine salts, triethanolamine salts, and N-methylmonoethanolamine salts, with monoethanolamine salts being more preferred. The anionic water-soluble polymer may be a copolymer having monomer units of a nonionic water-soluble polymer, for example, a PEG chain may be branched to a portion of the carboxyl groups of the polyacrylic acid chain. Conversely, polymers in which PEG chains are branched with polyacrylic acid chains are also included in this category. Examples of such polymers can be referred to, for example, JP-A-2010-275468.

Anionic polymers containing monomeric units having sulfonic acid groups or salts thereof include polystyrene sulfonic acid or salts thereof. Polystyrene sulfonic acid or a salt thereof can be obtained by sulfonating polystyrene, and may be a polystyrene/styrene sulfonic acid copolymer or a salt thereof depending on the sulfonation ratio. Preferred salts are the same as the anionic water-soluble polymer having a carboxy group described above.

From the viewpoint of availability and washability, preferred polymer components include sodium carboxymethylcellulose, sodium alginate, sodium polyacrylate, sodium polystyrene sulfonate, acrylic acid/sodium maleate, acrylic acid/sodium acrylamidomethylpropanesulfonate, and Olefin/sodium maleate.

Component (B) is preferably at least one selected from carboxymethylcellulose, acrylic/maleic acid copolymer, acrylic/acrylamidomethylpropanesulfonic acid copolymer and salts thereof. When the component (B) is a salt, it may be an alkali metal salt or an alkanolamine salt having a molecular weight of 150 or less. As the alkali metal salt, sodium salt and potassium salt are preferable. Alkanolamine salts having a molecular weight of 150 or less include monoethanolamine salts, diethanolamine salts, triethanolamine salts, and N-methylmonoethanolamine salts, with monoethanolamine salts being more preferred.

The weight-average molecular weight of component (B) is preferably 1,000 or more, more preferably 5,000 or more, still more preferably 10,000 or more, and preferably 2,000, from the viewpoint of anti-soil redeposition of particles. ,000 or less, more preferably 1,000,000 or less, and even more preferably 700,000 or less.
The weight average molecular weight of the component (B) is preferably 1,000 or more and 2,000,000 or less, more preferably 5,000 or more and 1,000,000 or less, still more preferably 10,000 or more and 700,000 or less.
This weight average molecular weight can be measured according to the weight average molecular weight measuring method described below.
<Method for measuring weight average molecular weight>
The weight average molecular weight of the component (B) can be measured by GPC (gel permeation chromatography), and the weight average molecular weight (Mw) can be obtained from a conversion standard substance. GPC measurement conditions are shown below.
・Column: manufactured by Tosoh Corporation, trade name: TSK-GEL guard PWXL
Manufactured by Tosoh Corporation, trade name: TSK-GEL G4000 PWXL
Manufactured by Tosoh Corporation, trade name: TSK-GEL G2500 PWXL
- Mobile phase: aqueous solution of 0.1 mol/L potassium dihydrogen phosphate and 0.1 mol/L sodium dihydrogen phosphate/acetonitrile = 90/10 (volume ratio)
・ Detector: Differential refractive index detector ・ Column temperature: 40 ° C.
・Flow rate: 1.0 mL/min
・Conversion standard material: Polyacrylic acid [manufactured by American Standard Corporation (AMERICAN STANDARD CORP)]
- Sample: Add ion-exchanged water to an aqueous polymer solution containing 0.8 g of solid content to prepare a total liquid volume of 200 mL.

<Composition and other components>
The powder detergent composition of the present invention contains component (A) in an amount of 5% by mass or more, preferably 10% by mass or more, more preferably 12.5% by mass or more, still more preferably 15% by mass, from the viewpoint of detergency and foamability. 30% by mass or less, preferably 25% by mass or less, more preferably 22.5% by mass or less, and even more preferably 20% by mass or less from the viewpoint of defoaming. In addition, in the present invention, when the component (A) can be in an acid form or a salt form, the content of the component (A) is a value converted to sodium salt.
The powder detergent composition of the present invention contains component (A) in an amount of 5% by mass or more and 30% by mass or less, preferably 10% by mass or more and 25% by mass or less, more preferably 10% by mass or more and 30% by mass or less, more preferably The content is 12.5% by mass or more and 22.5% by mass or less, more preferably 15% by mass or more and 20% by mass or less.

The powder detergent composition of the present invention contains component (B) in an amount of 0.5% by mass or more, preferably 0.8% by mass or more, more preferably 1.0% by mass or more, from the viewpoint of improving detergency, and , From the viewpoint of cost and formulation, the content is preferably 10% by mass or less, more preferably 8% by mass or less, still more preferably 6% by mass or less, and even more preferably 4% by mass or less. In addition, in the present invention, when the component (B) can be in an acid form or a salt form, the content of the component (B) is a value converted to sodium salt.
In the powder detergent composition of the present invention, the component (B) is preferably 0.5% by mass or more and 10.0% by mass or less, more preferably 0.8% by mass, from the viewpoints of improving cleaning performance, cost and formulation. % or more and 8.0 mass % or less, more preferably 1.0 mass % or more and 6.0 mass % or less.

The powder detergent composition of the present invention can optionally contain (C) a clay mineral [hereinafter referred to as component (C)].
(C) Component clay minerals include smectite-type clay minerals. Examples of smectite-type clay minerals include, but are not limited to, saponite, hectorite, sauconite, stevensite, montmorillonite, beidellite, and nontronite.

Although the component (C) is not particularly limited, it is preferable to blend a clay mineral represented by the following general formula (c1), for example.
[Si ₈ (Mg _a Al _b )O ₂₀ (OH) ₄ ] ^X− ·Me ^X+ (c1)
(Wherein, 0 < a ≤ 6, 0 < b ≤ 4, x = 12-2a-3b, Me is at least one of Na, K, Li, Ca, Mg and _NH4 , preferably At least one of Na and Ca.)

The average particle size of the smectite-type clay mineral is preferably 50 μm or less, more preferably 30 μm or less, still more preferably 20 μm or less, and preferably 1 μm or more, more preferably 5 μm or more, from the viewpoint of comfort during application and washing work. More preferably, it is 10 μm or more.
The average particle diameter of the smectite-type clay mineral is preferably 1 μm or more and 50 μm or less, more preferably 5 μm or more and 30 μm or less, still more preferably 10 μm or more and 20 μm or less, from the viewpoint of comfort during application and washing work.

The average particle size of the smectite-type clay mineral can be measured using, for example, a laser diffraction/scattering particle size distribution analyzer equipped with a dry measurement unit. Specifically, it can be measured by connecting a dry measurement unit G0310630 as an option to Partica LA-950 (manufactured by HORIBA, Ltd.) using the Mie scattering method. Compressed air settings for powder dispersion were measured at normal.

Examples of smectite-type clay minerals include "Bentonite", "Datasoft GIS", "Datasoft GIB", and "Datasoft GISW" manufactured by Raviossa, "Odosolv K-400" manufactured by Kurosaki Shirakuchi Kogyo Co., Ltd. Chemi's "Round Logil DGA212", "Round Logil PR414", "Round Logil DG214", "Round Logil DGA Powder", "Furasoft-1 Powder", CSM Pure Bentonite, Standard Bentonite, Premium Bentonite and the like.

In the powder detergent composition of the present invention, the component (C) is preferably 1% by mass or more, more preferably 2% by mass or more, still more preferably 3% by mass or more, from the viewpoint of comfort during application and cleaning work, and , preferably 15% by mass or less, more preferably 12% by mass or less, and still more preferably 10% by mass or less.
In the powder detergent composition of the present invention, the component (C) is preferably 1% by mass or more and 15% by mass or less, more preferably 2% by mass or more and 12% by mass or less, from the viewpoint of comfort during application and cleaning work. Preferably, it can be contained in an amount of 3% by mass or more and 10% by mass or less.

In the powder detergent composition of the present invention, the mass ratio (B)/(C) of the content of component (B) to the content of component (C) is determined from the viewpoint of particle detergency and comfort during application and cleaning work. , preferably 0.08 or more, more preferably 0.16 or more, still more preferably 0.24 or more, and preferably 2 or less, more preferably 1.33 or less, even more preferably 1.00 or less, even more preferably is 0.50 or less.
The content of components (B) and (C) satisfies the above range, and the mass ratio (B)/(C) of the content of component (B) and the content of component (C) is within the above range. is preferably

The powder detergent composition of the present invention can optionally contain (D) one or more compounds selected from inorganic sulfates and inorganic halogen compounds [hereinafter referred to as component (D)]. Component (D) is not only used as a skeleton for forming the form of a powder detergent composition, but also has the effect of reducing irritation caused by surfactants by protecting hands during hand washing.
Component (D) is not particularly limited as long as it is an inorganic sulfate or an inorganic halogen compound. For example, from the viewpoint of protecting hands, a compound selected from sodium sulfate, magnesium sulfate, sodium chloride and magnesium chloride preferable. Component (D) may be either a hydrate or an anhydride.

The powder detergent composition of the present invention preferably contains one or more compounds selected from inorganic sulfates as the component (D). The proportion of inorganic sulfate in component (D) is 100% by mass, or less than 100% by mass, preferably 97% by mass or less, and preferably 60% by mass or more, more preferably 70% by mass. % or more, more preferably 80 mass % or more, still more preferably 90 mass % or more.
Moreover, the powder detergent composition of the present invention more preferably contains at least sodium sulfate as the component (D). The proportion of sodium sulfate in component (D) is 100% by mass, or less than 100% by mass, preferably 97% by mass or less, and preferably 60% by mass or more, more preferably 70% by mass. Above, more preferably 80% by mass or more, still more preferably 90% by mass or more.
Component (D) can be contained as the balance after removing component (A), component (B), component (C) and other optional components.

The powder detergent composition of the present invention can contain a crystalline aluminosilicate other than the component (C) as the component (E). (E) component includes, for example, zeolite. Component (E) is generally used to improve the detergency of stains adhering to textile products.

(E) component includes, for example, zeolite. Specific zeolites include crystalline aluminosilicates such as A-type, X-type and P-type zeolites. The average primary particle size of component (E) is preferably 0.1 μm or more, more preferably 1 μm or more, and preferably 10 μm or less, more preferably 5 μm or less. Component (E) is preferably A-type zeolite (e.g., product name “Toyobuilder” manufactured by Tosoh Corporation, oil absorption capacity according to JIS K 5101 method: 40 mL/100 g or more). name "Doucil A24", "ZSEO64", etc.; both manufactured by Crosfield; oil absorption 60-150 mL/100 g), type X (for example, trade name "WessalithXD"; manufactured by Degussa; oil absorption 80-100 mL/100 g); Also suitable are the hybrid zeolites described in WO9842622.

In the powder detergent composition of the present invention, the component (E) is preferably 1% by mass or more, more preferably 3% by mass or more, and still more preferably 5% by mass or more, from the viewpoint of assisting cleaning performance in coating and cleaning work. From the viewpoint of visibility of stain removal in coating and washing work, the content is preferably 20% by mass or less, more preferably 17.5% by mass or less, and even more preferably 15% by mass or less.
In the powder detergent composition of the present invention, the component (E) is preferably 1% by mass or more and 20% by mass or less, more preferably 3% by mass, from the viewpoints of detergency assistance in coating and cleaning work and visibility of stain removal. 17.5% by mass or less, more preferably 5% by mass or more and 15% by mass or less.

The powder detergent composition of the present invention optionally contains (F) one or more alkali agents selected from alkali metal carbonates, alkali metal hydrogen carbonates, alkali metal silicates and tripolyphosphates [hereinafter referred to as (F) component].

Alkali metal carbonates include sodium carbonate and potassium carbonate, with sodium carbonate being preferred.
Alkali metal hydrogencarbonates include sodium hydrogencarbonate and potassium hydrogencarbonate.
Alkali metal silicates include sodium silicate and potassium silicate.
As the tripolyphosphate, an alkali metal salt of tripolyphosphate is preferable, and sodium tripolyphosphate is more preferable.

The powder detergent composition of the present invention can contain an alkali metal carbonate as the component (F).

The powder detergent composition of the present invention optionally contains a bleaching agent (perborate, bleach activator, etc.), an anti-soil redeposition agent, a softening agent (cationic activator, etc.), a reducing agent, and a fluorescent brightening agent. , foam inhibitors (silicone, polysiloxane, etc.), fragrances, enzymes (cellulase, protease, peptinase, lipase, dextranase, amylase, etc.), coloring agents, and the like.

<Method for producing powder detergent composition>
The powder detergent composition of the present invention can be produced by applying a known method. For example, spray drying method, dry neutralization method, dry neutralization method described in Japanese Patent No. 3313372, dry granulation method, dry blending method, fluidized bed drying method, thin film drying method, extrusion granulation method, tumbling method. It can be produced by applying a granulation method, a stirring granulation method, a compaction granulation method, a surfactant loading method, or a combination thereof. Among these, the powder detergent composition of the present invention is preferably produced by the dry neutralization method because of its high bulk density. The dry neutralization method is a manufacturing method having a dry neutralization step of neutralizing an acid precursor of an anionic surfactant with an alkaline agent. The powder detergent composition of the present invention is produced by a production method including a dry neutralization step of neutralizing the acid precursor by mixing the acid precursor of an anionic surfactant with a particulate alkaline agent. things are preferred.

<Washing method for textile products>
Next, the method for washing textiles according to the present invention will be described. In the method for washing textiles of the present invention, textiles can be washed using the powder detergent composition of the present invention. The powder detergent composition used in the cleaning method for textiles of the present invention contains the above-described components (A) and (B), and can optionally contain components (C) to (F). Further, in the powder detergent composition used in the method for cleaning textiles of the present invention, preferred aspects and preferred contents of components (A) to (F) are described in the powder detergent composition of the present invention. is the same as

The method for cleaning a textile product of the present invention comprises a textile product, water, 5% by mass or more and 30% by mass or less of the component (A), and 0.5% by mass or more of the component (B). and are brought into contact with each other, and an external force is applied to the textiles together with the pre-powder detergent composition present on the textiles to perform washing.
In the method for washing a textile product of the present invention, the presence of the powder detergent composition on the textile product may be a state in which the presence of the powder detergent composition remaining undissolved on the textile product can be visually confirmed. .
Specifically, the presence of a powder detergent composition in textiles means that when textiles are observed with a digital microscope (VHX7000, manufactured by Keyence Corporation) at a magnification of 30 times, the powder detergent composition powder particles, crystals, or insoluble matter can be confirmed.

Further, in the method for washing a textile product of the present invention, the textile product contains water, 5% by mass or more and 30% by mass or less of the component (A), and 0.5% by mass or more of the component (B), and the water is It may be a cleaning method for textiles, in which the textiles are washed by contacting with a powder detergent composition exceeding the saturated solubility in the textiles and applying an external force to the textiles. It is preferable to bring the textile product into contact with water and the powder detergent composition, and apply an external force to the textile product together with the powder detergent composition present on the textile product to wash the textile product.
The saturated solubility in water is the limit mass of the powder detergent composition that can be dissolved in water. The saturated solubility in water can be obtained from the solubility of the powder detergent composition in water at a predetermined temperature and the mass of water brought into contact with the textile product. The solubility of the powder detergent composition in water is determined from the maximum mass of the powder detergent composition that dissolves in 100 g of water at a given temperature (for example, 25°C).

In addition, the method for cleaning textiles of the present invention includes a powder detergent containing water, 5% by mass or more and 30% by mass or less of the component (A), and 0.5% by mass or more of the component (B) in the textiles. A method for washing textiles, comprising contacting the composition with the powder detergent composition present on the textiles and applying an external force to the textiles to wash them substantially without the addition of further water. can be

Here, the method for washing textile products of the present invention will be described in detail with specific examples. The method for washing textiles of the present invention is not limited to the specifically illustrated embodiments. For example, step 1 and step 2 below may be performed simultaneously or step 1 may be performed after step 2 is performed.

The method for cleaning textiles of the present invention includes a step of contacting the textiles with water (Step 1), a step of bringing the textiles in contact with the water into contact with the powder detergent composition (Step 2), and and a step (step 3) of applying an external force to the textile product together with the powder detergent composition to wash the textile product.

Step 1 is a step of contacting the textile product with water, that is, a step of contacting the soiled portion of the textile product with water to wet the soiled portion of the textile product with water. The water may be tap water, well water, river water, lake water, or the like.

The amount of water that is brought into contact with the textiles in step 1 is adjusted based on the mass of the powder detergent composition that is brought into contact with the textiles in step 2. For example, in step 1, from the viewpoint of detergency, preferably 0.100 g or more, more preferably 0.120 g or more, more preferably 0.125 g or more, still more preferably 0.250 g or more, still more preferably 0.375 g or more, and preferably 1.000 g or less from the viewpoint of visibility of stains during application washing , more preferably 0.750 g or less, and still more preferably 0.500 g or less.
In step 1, the powder detergent composition applied in step 2 is preferably 0.100 g or more per 1 g of water brought into contact in step 1, from the viewpoint of detergency and dirt visibility during application and washing. .000 g or less, more preferably 0.120 or more and 0.750 or less, still more preferably 0.125 or more and 0.750 or less, still more preferably 0.250 or more and 0.500 or less, water to the textile product can be contacted.

The German hardness of the water used in step 1 is preferably 2° dH or more, more preferably 4° dH or more, still more preferably 6° dH or more, and preferably 30° dH or less, from the viewpoint of particle cleaning properties. , more preferably 25°dH or less, still more preferably 15°dH or less.

_The German hardness (° dH) in the present invention means that the concentration of calcium and magnesium in water is 1 mg/L (mg/kg) = about 0.056° dH (1° dH = 17.8 mg/ kg). The German hardness of the water used for washing can be adjusted, for example, based on values calculated from the types and amounts of hardness components added. In addition, when using water of unknown hardness such as tap water as the water used for washing, the German hardness of the water is obtained by the chelate titration method using disodium ethylenediaminetetraacetic acid described below. . A specific method for measuring the German hardness of water is shown below.
<Method for measuring the German hardness of water>
〔reagent〕
・ 0.01 mol / L EDTA · 2Na solution: 0.01 mol / L aqueous solution of disodium ethylenediaminetetraacetate (solution for titration, 0.01M EDTA-Na2, manufactured by SIGMA-ALDRICH)
・Universal BT indicator (product name: Universal BT, manufactured by Dojindo Laboratories)
・ Ammonia buffer solution for hardness measurement (solution of 67.5 g of ammonium chloride dissolved in 570 mL of 28 w/v% ammonia water and adjusted to 1,000 mL with deionized water)
[Measurement of German hardness]
(1) Collect 20 mL of water as a sample in a conical beaker with a whole pipette.
(2) Add 2 mL of ammonia buffer for hardness measurement.
(3) Add 0.5 mL of Universal BT indicator. Confirm that the solution after the addition is reddish purple.
(4) A 0.01 mol/L EDTA·2Na solution is added dropwise from a burette while shaking the conical beaker well, and the end point of the titration is when the sample water turns blue. (5) Calculate the total hardness by the following formula.
Hardness (°dH) = T x 0.01 x F x 56.0774 x 100/A
T: Titration volume (mL) of 0.01mol/L EDTA/2Na solution
A: Sample volume (20 mL, volume of water to be sampled)
F: Factor of 0.01mol/L EDTA/2Na solution

Not only the water used in step 1, but also the German hardness of the water used in other processes (for example, the process of washing textile products in a washing machine, the process of rinsing textile products, etc.) preferably have a German hardness similar to the German hardness of

Step 2 is a step of bringing the powder detergent composition into contact with the water-contacted textiles, specifically the water-contacted portion of the textiles. For example, the powdered detergent composition can be brought into contact with the textiles by applying or sprinkling the powdered detergent composition on the textiles.
Step 2 may be a step of contacting the powder detergent composition in an amount exceeding the saturated solubility in the water brought into contact in Step 1. In addition, the powder detergent composition contains 5% by mass or less of an anionic surfactant as component (A) and 30% by mass or less and 0.5% by mass or more of a water-soluble polymer as component (B). It may be a composition.

In the step 2, from the viewpoint of application cleaning properties, the concentration of the powder detergent composition in the water contained in the textile product, that is, the concentration of the powder detergent composition in the water in which the powder detergent composition is dissolved in the textile product is preferable. is more than 5% by mass, more preferably 10% by mass or more, still more preferably 20% by mass or more, and from the viewpoint of comfort during application and washing work, preferably 80% by mass or less, more preferably 70% by mass or less, More preferably, the powder detergent composition is brought into contact with textiles so as to be 60% by mass or less. In addition, in the present invention, the concentration of the powder cleaning composition dissolved in the water brought into contact with the textile product in step 1 can be regarded as the concentration of the powder cleaning composition in water. . The mass of the powder detergent composition dissolved in water is calculated by subtracting the mass of the powder detergent composition left undissolved from the mass of the powder detergent composition brought into contact with the textile product.
In step 2, from the viewpoint of compatibility between the application washability and the comfort of the application washing work, the concentration of the powder detergent composition in the water contained in the textile product is preferably more than 5% by mass and 80% by mass or less, more preferably The powder detergent composition is brought into contact with the textiles so as to be 10% by mass or more and 70% by mass or less, more preferably 20% by mass or more and 60% by mass or less.

The powder detergent composition is applied to the textiles so that the amount of the powder detergent composition to be brought into contact with the textiles in Step 2 is within the range described in Step 1 above, per 1 g of the water brought into contact in Step 1. By contacting, the concentration of the powder detergent composition in the water contained in the textile can be made within the above range.

In Steps 2 and 3, the water in which the powder detergent composition is dissolved in the water that is brought into contact with the textile product preferably has a pH of 9.5 or more at 25°C from the viewpoint of the coating and washing properties of the particles. More preferably 10 or more, still more preferably 10.5 or more, and from the viewpoint of safety to hand skin, it is preferably 13 or less, more preferably 12.5 or less, and still more preferably 12 or less. In addition, pH of this invention is measured by a glass electrode method. Specifically, the pH of water in which the powder detergent composition is dissolved is measured by the following method.
<Method for measuring pH>
A pH electrode (model 6367) was placed on a Horiba pH meter (D-52) in advance with a phthalate buffer solution (pH 4.01), a phosphate standard solution (pH 6.84), and a borate standard solution (pH 9.18). Calibrate and rinse thoroughly with deionized water. The pH electrode, which has been calibrated and washed as described above, is placed in water in which the powder detergent composition is dissolved and the temperature is adjusted to 25° C., and the pH is measured using the AUTO HOLD mode of the pH meter until the measured value becomes constant.
The pH obtained by dissolving 15 g of the powder detergent composition in 40 g of deionized water at 25°C can be regarded as the pH at 25°C of the water in which the powder detergent composition in the textile product is dissolved.

Step 3 is a step of washing by applying an external force to the textiles together with the powder detergent composition present on the textiles. Step 3 may be a step of applying an external force to the fabric to wash it with the powder detergent composition present on the fabric, substantially without the addition of additional water.

In the present invention, "substantially without adding additional water" means that in step 2 and/or step 3, water is added to the extent that the powder detergent composition on the textile product is wetted with water, and washing is performed. It does not exclude the further addition of water to the extent that the entire textile product served is wetted.
For example, in step 2, the concentration of the powder detergent composition in the water contained in the textile product, that is, the concentration of the powder detergent composition in the water in which the powder detergent composition is dissolved in the textile product is preferably 5% by mass. more preferably 10% by weight or more, more preferably 20% by weight or more, and 80% by weight or less, more preferably 70% by weight or less, even more preferably 60% by weight or less. Additions are acceptable.

In step 3, washing can be performed by applying an external force to the textile product in which the water and the powder detergent composition are brought into contact without reducing the concentration of the powder detergent composition in the water in which the powder detergent composition is dissolved. preferable.
In step 3, washing by applying an external force to the textile product may be washing by manually applying a physical force to the textile product, for example, water and a powder detergent composition. may be subjected to one or more selected from rubbing, brushing, and slapping the textile product contacted with. In step 3, one or more selected from rubbing the textile with the powder detergent composition present on the textile and brushing the textile with the powder detergent composition present on the textile. It is preferable to perform washing by applying an external force to the textile product. These actions may be performed manually.

In step 3, it is preferable that the powder detergent composition that has been brought into contact with the textile product in step 2 remains undissolved. Since the powder detergent composition remains undissolved in step 3, the textile product can be washed by applying an external force without reducing the concentration of the powder detergent composition dissolved in the water contained in the textile product. can.
The mass of the powder detergent composition remaining undissolved in step 3 is preferably 10% by mass or more, more preferably 10% by mass or more, of the mass of the powder detergent composition contacted with the textile product in step 2, from the viewpoint of coating and cleaning properties. is 15% by mass or more, more preferably 20% by mass or more, and preferably 70% by mass or less, more preferably 60% by mass or less, and still more preferably 50% by mass or less from the viewpoint of comfort during application and washing work. .
The mass of the powder detergent composition remaining undissolved in step 3 satisfies the above range at any time from the start of applying the external force to the textile product until the end of applying the external force. It is preferable that the mass of the powder detergent composition remaining undissolved after applying the external force to the textile satisfies the above range.
The mass of the powder detergent composition left undissolved in step 3 is the mass of the powder detergent composition that has been brought into contact with the textile product in step 2, from the viewpoint of achieving both coating detergency and comfort during coating and cleaning work. , preferably 10% by mass or more and 70% by mass or less, more preferably 15% by mass or more and 60% by mass or less, and still more preferably 20% by mass or more and 50% by mass or less.

In step 3, the mass of the undissolved powder detergent composition can be obtained by collecting the undissolved powder detergent composition on the textile product with a spatula and drying the collected powder detergent composition. can. To give a specific example, in step 3, the mass of the powder detergent composition remaining undissolved on the textile product when the external force has been applied to the textile product is The powder detergent composition remaining undissolved on the textile product is collected with a spatula and dried in an oven at 105°C for 1 hour.
If it is difficult to measure the mass of the powder detergent composition that remains undissolved on the textile, place the amount of the powder detergent composition that was in contact with the textile in step 2 on the folded aluminum foil, and , Add the same amount of water as the amount of contact with the textile product in step 1, fold the aluminum foil in half and apply the same external force as in step 3 to wash, and collect the insoluble matter remaining on the aluminum foil. The mass of the solid content dried in an oven at 105°C for 1 hour may be regarded as the mass of the powder detergent composition remaining undissolved on the textile product in step 3 when the external force is applied to the textile product. . If it is difficult to separate the insoluble and soluble components of the powder detergent composition, use ADVANTEC No. 3 filter paper or the like may be used to obtain the insoluble content of the powder detergent composition by subtracting the mass of the filter paper.

In addition, after performing the washing of steps 1 to 3, one or more selected from washing the textile product with a washing machine, washing the textile product by hand, and rinsing the textile product with water. good too.

Various fibers such as natural fibers, synthetic fibers, and semi-synthetic fibers can be used in the method for washing textile products of the present invention. The textile product cleaning method of the present invention can be applied to textile products containing these fibers. Textiles may be, for example, clothing.

The fibers may be hydrophobic fibers or hydrophilic fibers. Examples of hydrophobic fibers include protein fibers (milk protein casein fiber, Promix, etc.), polyamide fibers (nylon, etc.), polyester fibers (polyester, etc.), polyacrylonitrile fibers (acrylic, etc.), polyvinyl alcohol fibers, etc. Fibers (vinylon, etc.), polyvinyl chloride fibers (polyvinyl chloride, etc.), polyvinylidene chloride fibers (vinylidene, etc.), polyolefin fibers (polyethylene, polypropylene, etc.), polyurethane fibers (polyurethane, etc.), polyvinyl chloride/ Examples include polyvinyl alcohol copolymer fibers (polycleral etc.), polyalkylene paraoxybenzoate fibers (benzoate etc.), polyfluoroethylene fibers (polytetrafluoroethylene etc.) and the like. Hydrophilic fibers include, for example, seed hair fibers (cotton, kapok, etc.), bast fibers (hemp, flax, ramie, hemp, jute, etc.), leaf vein fibers (manila hemp, sisal hemp, etc.), palm fibers, rush, Straw, animal hair fibers (wool, mohair, cashmere, camel hair, alpaca, vicuna, angora, etc.), silk fibers (domestic silk, wild silk, etc.), feathers, cellulose fibers (rayon, polynosic, cupra, acetate, etc.), etc. are exemplified.
In the present invention, textile products include fabrics such as woven fabrics, knitted fabrics, and non-woven fabrics using the above-mentioned hydrophobic fibers and hydrophilic fibers, and undershirts, T-shirts, dress shirts, blouses, slacks, hats, etc. obtained using the same. Products such as handkerchiefs, towels, knitwear, socks, underwear, and tights. Preferred textile products are woven and woven textile products such as woven fabrics and knitted fabrics, and from the same point of view, preferred textile products are textile products containing cotton fibers.

<Ingredients>
The following ingredients were used for the production of the powder detergent compositions in Table 1 and the powder detergent compositions A and B in Table 2.
(A) Component LAS: sodium lauryl benzene sulfonate (Neopelex G-15, manufactured by Kao Corporation)
(B) Component CMC: Carboxymethyl cellulose, Sunrose B2B (manufactured by Nippon Paper Industries Co., Ltd.), viscosity 5-30 mPa s (concentration 1%, 25 ° C.), degree of etherification 0.4-0.8
・ Acrylic acid / maleic acid copolymer (sodium salt): Poise 521 (manufactured by Kao Corporation)
・ Sulfonic acid copolymer: Aron 6012 (manufactured by Toagosei Co., Ltd.), solid content 40%, viscosity 100 to 350 mPa s (25 ° C.)
・Sodium polyacrylate (manufactured by Kao Corporation), weight average molecular weight 10,000 ・Xanthan gum (manufactured by Fujifilm Wako Pure Chemical Industries, Ltd.): weight average molecular weight > 2,000,000
(B') Component HEC: Hydroxyethyl cellulose (SE850K, manufactured by Daicel Miraise Co., Ltd.))
・ PEG: polyethylene glycol (manufactured by Fujifilm Wako Pure Chemical Industries, Ltd.), weight average molecular weight 20,000, 50 to 200 mPa s (25% by mass aqueous solution)
(C) Component Bentonite: Kunipia F (manufactured by Kunimine Industry Co., Ltd.)
・ Saponite: Sumecton SA (manufactured by Kunimine Industry Co., Ltd.)
・ Hectorite: Synthetic hectorite (manufactured by FUJIFILM Wako Pure Chemical Industries, Ltd.), hydrophilic kaolin (manufactured by FUJIFILM Wako Pure Chemical Industries, Ltd.)
(D) Component Sodium sulfate: Anhydrous neutral mirabilite (manufactured by Shikoku Kasei Kogyo Co., Ltd.)
(E) Component Zeolite: Synthetic zeolite (manufactured by Fujifilm Wako Pure Chemical Industries, Ltd.), A-4, powder, 75 μm (200 mesh) passage (F) Component Sodium carbonate: Light ash (Central Glass Co., Ltd.)
・Other ingredients ・Fluorescent dye: Tinopal CBS (manufactured by Ciba Specialty Chemicals)

<Powder detergent composition A, B>
For the evaluation of the cleaning methods for textiles in Examples and Comparative Examples, powder detergent compositions A and B for textiles were produced by the dry neutralization method using the above components.
Powder detergent composition A contains 17.5% by mass of sodium laurylbenzenesulfonate, 37% by mass of sodium carbonate, 0.5% by mass of sodium polyacrylate, 5.5% by mass of zeolite, and 0.025% by mass of fluorescent dye. The mixture was blended and the balance was adjusted with sodium sulfate.
Powder detergent composition B was obtained by blending powder detergent composition A with 2.18% by mass of carboxymethylcellulose and 3% by mass of bentonite, and adjusting the increased amount of the blended ingredients with sodium sulfate.

<Water used for each evaluation>
In the following evaluations, water containing the following hardness components was used unless otherwise specified. 78.50 g of calcium chloride dihydrate (manufactured by FUJIFILM Wako Pure Chemical Industries, Ltd.) and 73.58 g of magnesium chloride hexahydrate (manufactured by FUJIFILM Wako Pure Chemical Industries, Ltd.) were added to 1 L of deionized water. A dissolved concentrated stock solution was prepared. This concentrated stock solution was calcium/magnesium=6/4 (molar ratio). The resulting concentrated stock solution was diluted with dilution water having an alkalinity of 100 mg/L (calculated as CaCO ₃ ) and a pH of 7.5, and adjusted to a German hardness of 10°dH before use. The water for dilution is adjusted to alkalinity by adding sodium bicarbonate (manufactured by FUJIFILM Wako Pure Chemical Co., Ltd.) to ion-exchanged water, and adding hydrochloric acid (manufactured by FUJIFILM Wako Pure Chemical Co., Ltd.) to pH was obtained by adjusting

<Preparation of artificial mud-contaminated cloth>
The model soiled cloth used for evaluation was prepared by the following procedure. Since this method adheres particles between fibers by re-contamination, the soiled cloth is more difficult to remove than a normal soiled cloth with mud applied to the surface. The mud used was Kanuma gardening Akadama soil dried at 120° C.±5° C. for 4 hours, pulverized and passed through a 75 μm sieve before use. 6 g of mud was added to 1,000 mL of ion-exchanged water, stirred, and then subjected to ultrasonic waves for 15 minutes. These were transferred to a tergotometer, 15 g of cotton knitted cloth (purchased from Tanigashira Shoten, 6 cm x 6 cm) was added, and the mixture was stirred at 20°C and 100 rpm for 20 minutes. After that, rinsing with running water was performed for 1 minute, dehydration was performed for 1 minute, and air drying was performed overnight.

<Preparation of artificial sebum-stained cloth>
-Artificial Dirt A composition containing the following A, B, C, D, and E was used as an artificial dirt. Each % by mass is the proportion in the final composition of the artificial soil, and the amount of B was adjusted so that the total was 100% by mass.
A: Model sebum stain (mass% in artificial dirt is lauric acid 0.44% by mass, myristic acid 3.15% by mass, pentadecanoic acid 2.35% by mass, palmimitic acid 6.31% by mass, heptadecanoic acid 0 44% by weight, 1.6% by weight of stearic acid, 7.91% by weight of oleic acid, 13.33% by weight of triolein, 2.22% by weight of n-hexadecyl palmitate, and 6.66% by weight of squalene use)
B: Hard water obtained by weighing 105 mg of dihydrate of calcium chloride and dissolving it in distilled water to make 1,000 mL C: Egg white lecithin liquid crystal 1.98% by mass (Arginine hydrochloride 11.37 g, histidine 4 in 80 mL of distilled water Egg white lecithin liquid crystal obtained by dissolving .20 g and 2.44 g of serine, adjusting the pH to 5.0 with concentrated hydrochloric acid, and thoroughly mixing the solution and egg white lecithin with a mixer)
D: 8.11% by mass of Kanuma red clay
E: 0.025% by mass of carbon black
The artificial sebum-stained cloth used was a 6 cm x 6 cm cotton/polyester broadcloth blended dyed cloth (cotton/polyester ratio = 35/65, purchased from Tanigashira Shoten), and 100 mg of artificial dirt consisting of the above composition was added to each cloth. It is gravure coated.

<Evaluation of detergency>
(1) Examples 1-1 to 1-12, 2-1 and Comparative Examples 1-1 to 1-2 (coating and cleaning)
With respect to each of the powder detergent compositions in Table 1, the artificial mud-contaminated cloth was washed by the application washing described below, and the detergency was evaluated. In addition, with regard to the powder detergent composition of Example 2-1 in Table 2, the artificial mud-stained cloth and the artificial sebum-stained cloth were each washed by the application washing described below, and the detergency was evaluated.
For each of the artificial mud-contaminated cloth and the artificial sebum-contaminated cloth, after adding 2.5 mL of hard water of 179 mg / L in terms of calcium carbonate (this hard water corresponds to 10 ° dH in German hardness) per cloth , 0.3 g of the powder detergent composition shown in Table 1 or Table 2 was directly applied to each, and hand rubbing was performed five times from two directions in the applied state. After hand rubbing, the contaminated cloth was observed visually and with a digital microscope (VHX7000, manufactured by Keyence Corporation) at a magnification of 30 times. It was confirmed that the contaminated cloth was rubbed together with the powder detergent composition.
Next, in 600 mL of hard water in which 0.6 g of each powder cleaning composition is dissolved, four contaminated cloths rubbed with each of the powder cleaning compositions are added, and the cleaning time is 10 with a tergotometer. The cleaning was performed under conditions of 100 rpm rotation speed and 30° C. water temperature. The water used to prepare the cleaning solution was water adjusted to a water temperature of 25° C. and a German hardness of 10° dH. After cleaning, it was rinsed for 1 minute with the same water used to prepare the cleaning solution.
The detergency was evaluated based on the detergency (%) calculated based on the following formula (1). Specifically, the reflectance of the original cloth before contamination and the contaminated cloth before and after washing is measured with a colorimetric color difference meter (Nippon Denshoku Co., Ltd. Z-300A), and washed based on the following formula (1). A rate (%) was obtained. The cleaning rate results represent the average of the calculated results for the 4 soiled cloths. The higher the cleaning rate, the better the cleaning performance of the cleaning method.
Cleaning rate (%) = 100 x [(reflectance of contaminated cloth after washing - reflectance of contaminated cloth before washing) / (reflectance of raw cloth - reflectance of contaminated cloth before washing)] (1)

(2) Comparative Examples 2-1 and 2-2 (washing using a washing machine)
Four pieces of each of the artificial mud-contaminated cloth and the artificial sebum-contaminated cloth were put into 1 L of the washing liquid in which the powder detergent composition described in Table 2 was dissolved, and the targotometer (MS-8212 manufactured by Ueshima Co., Ltd., inner diameter 12 cm) was measured. , height 17.5 cm) and washed at 100 r/min for 10 minutes. The concentration of the powder detergent composition in the cleaning liquid was 0.1% by mass. The water used for preparing the cleaning solution was water adjusted to a water temperature of 25° C. and a German hardness of 10° dH. After cleaning, it was rinsed for 1 minute with the same water used to prepare the cleaning solution. The cleaning rate was calculated based on the formula (1) in the same manner as in the case of (1) above for any of the contaminated cloths. The cleaning rate results represent the average of the calculated results for the 4 soiled cloths.

(3) Comparative Examples 2-3 and 2-4 (model evaluation assuming hand washing)
Four pieces of each of the artificial mud-contaminated cloth and the artificial sebum-contaminated cloth were put in 1 L of the cleaning liquid in which the powder detergent composition shown in Table 2 was dissolved, and after immersing them for 30 minutes, a tergotometer (manufactured by Ueshima Co., Ltd.) MS-8212, inner diameter 12 cm, height 17.5 cm) was washed at 180 r/min for 3 minutes. The concentration of the powder detergent composition in the cleaning liquid was 0.4% by mass. The water used to prepare the cleaning solution was water adjusted to a water temperature of 25° C. and a German hardness of 10° dH. After cleaning, it was rinsed for 1 minute with the same water used to prepare the cleaning solution. The cleaning rate was calculated based on the formula (1) in the same manner as in the case of (1) above for any of the contaminated cloths. The cleaning rate results represent the average of the calculated results for the 4 soiled cloths.

<Method for measuring pH>
A pH meter (pH/ion meter F-23, manufactured by HORIBA) was connected to a combined electrode for pH measurement (glass-sliding sleeve type, manufactured by HORIBA), and the power was turned on. A saturated potassium chloride aqueous solution (3.33 mol/L) was used as the pH electrode internal liquid. Next, pH 4.01 standard solution (phthalate standard solution), pH 6.86 (neutral phosphate standard solution), and pH 9.18 standard solution (borate standard solution) are each filled in a 100 mL beaker, and 25 °C constant temperature bath for 30 minutes. The pH measuring electrode was immersed in a standard solution adjusted to a constant temperature for 3 minutes, and a calibration operation was performed in the order of pH 6.86→pH 9.18→pH 4.01. A sample to be measured (a solution prepared by dissolving 15 g of a powder detergent composition in 40 g of ion-exchanged water) was adjusted to 25°C, the electrode of the pH meter was immersed in the sample, and the pH was measured after 1 minute. bottom. When the pH of the powder detergent compositions shown in Tables 1 and 2 was measured by this method, the pH range of each powder detergent composition was 10 or more and 13 or less.

<Measurement of insoluble matter after hand washing>
0.3 g of the powder detergent composition described in Table 1 or Table 2 was placed on the folded aluminum foil, and 2.5 mL of 10° dH hard water was added. After folding the aluminum foil in half in the same manner as in the application washing described in <Evaluation of detergency> (1) above, hand rubbing was performed five times each from two directions. After that, the insoluble matter remaining on the aluminum foil was recovered with a spatula without leaving any residue, and then dried in an oven at 105° C. for 1 hour to measure the mass of the solid matter. Then, the ratio (% by mass) of the insoluble matter to the powder cleaning composition placed on the aluminum foil is calculated as (mass of the solid matter after drying) / (total mass of the powder cleaning composition placed on the aluminum foil). Calculated by
The ratio of this insoluble matter is the ratio of the total amount of the powder detergent composition in contact with the contaminated cloth of the powder detergent composition left undissolved after the above <Evaluation of detergency> (1) hand rubbing [hand It is shown in Tables 1 and 2 as [powder detergent composition left undissolved after rubbing/powder detergent composition contacted with contaminated cloth] (% by mass).

<Evaluation of slipperiness of clothes in hand washing>
After adding 2.5 mL of hard water of 179 mg/L in terms of calcium carbonate (this hard water corresponds to 10° dH in German hardness) per piece of artificial mud-contaminated cloth, the powder cleaning agents described in Tables 1 and 2 are added. 0.3 g of the composition (0.01 g in the case of Comparative Examples 2-3 and 2-4) was directly applied to each of them, and in the state of application, hand rubbing was performed five times each from two directions. Sensory evaluation of the slipperiness of the clothes in hand-washing was performed based on the feel of the clothes during washing. A panel of 5 people judged whether or not they could feel the slipperiness of clothes based on the base powder detergent composition. Evaluation criteria are shown below. It can be said that the greater the number of panelists who judged that the surface was slippery, the higher the comfort of hand washing.
The base powder detergent composition contains (A) 17.5% by mass of sodium laurylbenzenesulfonate, 37% by mass of sodium carbonate, and 0.025% by mass of a fluorescent dye, and the balance is (D) sodium sulfate. It is an adjusted composition.
- Evaluation criteria ◯: 3 or more out of 5 panelists judged that the clothes were slippery.
Δ: 1 to 2 out of 5 panelists judged that the clothes were slippery.

*1: The concentration (% by mass) of the powder detergent composition in Examples and Comparative Examples in Table 1 and Example 2-1 in Table 2 is the mass of water brought into contact with the contaminated cloth and It is the concentration calculated based on the mass of the contacted powder detergent composition excluding the powder detergent composition left undissolved after manual rubbing.

Claims (16)

A textile product is brought into contact with water and a powder detergent composition containing 5% by mass or more and 30% by mass or less of the following component (A) and 0.5% by mass or more of the following component (B), and is placed on the textile product. A method for washing a textile product, wherein the textile product is washed by applying an external force to the textile product together with the undissolved powdery detergent composition.
(A) component: anionic surfactant (B) component: anionic water-soluble polymer A textile product is brought into contact with water and the powder detergent composition exceeding the saturated solubility in water, and an external force is applied to the textile product together with the powder detergent composition remaining undissolved on the textile product. 2. The method for washing a textile product according to claim 1, wherein the washing is performed by A step 1 of contacting the textile product with water, a step 2 of contacting the textile product contacted with the water with the powder detergent composition exceeding the saturated solubility in the water, and the powder remaining undissolved on the textile product. 3. The method for washing a textile product according to claim 1 or 2, comprising a step 3 of applying an external force to the textile product together with the detergent composition to wash the textile product. 4. The method for washing textiles according to claim 3, wherein the amount of the powder detergent composition to be brought into contact with the textiles in step 2 is 0.100 g or more and 1.000 g or less per 1 g of water brought into contact in step 1. 5. The method for cleaning textiles according to claim 3 or 4, wherein in step 3, the powder detergent composition that has been brought into contact with the textiles in step 2 remains undissolved. 6. Any one of claims 1 to 5, wherein after the textile product is brought into contact with water and the powder detergent composition, the textile product is washed by applying an external force without substantially adding water. A method for washing the textile product according to the above item . Any one of claims 1 to 6 , wherein the mass of the powder detergent composition left undissolved on the textile product is 10% by mass or more and 70% by mass or less of the mass of the powder detergent composition brought into contact with the textile product. A method for washing the textile product according to the above item . The method for washing textiles according to any one of claims 1 to 7, wherein the powder detergent composition concentration of the water in which the powder detergent composition is dissolved exceeds 5% by mass. The method for cleaning textiles according to any one of claims 1 to 8 , wherein 0.1 g or more of the powder detergent composition is brought into contact with the textiles per 1 g of water brought into contact with the textiles. The cleaning of textile products according to any one of claims 1 to 9 , wherein a solution obtained by dissolving 0.3 g of the powder detergent composition in 0.8 g of water at 25°C has a pH of 10 or more and 13 or less. Method. Applying an external force to the textile product for washing includes: rubbing the textile product together with the powder detergent composition remaining dissolved on the textile product; The method for washing textiles according to any one of claims 1 to 10 , wherein the textiles are washed with a brush together with the agent composition. After applying an external force to the textile product to wash it, further perform one or more selected from washing the textile product with a washing machine, washing the textile product by hand, and rinsing the textile product with water. The method for cleaning textile products according to any one of claims 1 to 11 . Component (B) is one or more selected from carboxymethylcellulose, acrylic acid /maleic acid copolymer, acrylic acid /acrylamidomethylpropanesulfonic acid copolymer and salts thereof, any one of claims 1 to 12 . 2. A method for washing a textile product according to item 1. The method for cleaning textiles according to any one of claims 1 to 13 , wherein the powder detergent composition contains (C) a clay mineral [hereinafter referred to as component (C)]. 15. The method for washing textiles according to claim 14 , wherein the component (C) is a smectite-type clay mineral. The powder detergent composition contains 0.8% by mass or more and 4% by mass or less of component (B) and 3% by mass or more of component (C), and the content of component (B) and the content of component (C) 16. The method for washing a textile product according to claim 14 or 15 , wherein the mass ratio (B)/(C) of is 0.08 or more and 1.33 or less.