JP5291910B2 - Powder detergent composition for linen supply - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a powder detergent composition for linen supply having excellent washability and anti-restaining characteristics. <P>SOLUTION: The powder detergent composition for linen supply contains (A) a specific polyoxyalkylene ether type nonionic surfactant, (B) an acrylic acid-based polymer of weight-average molecular weight 1,000-10,000 or its salt, (C) a water-soluble chelating agent (except that containing phosphorus), and (D) an alkali chemical each by an amount within a specific range. <P>COPYRIGHT: (C)2009,JPO&amp;INPIT

Description

  In the field of linen supply, the present invention is a powder detergent composition for linen supply that is suitable for washing linens such as sheets, covers, towels, towels, kitchen clothing, and healthcare workers using a continuous washing machine. Related to things.

  In the cleaning industry, there are ordinary cleaning stores, linen supply, and other business types. Among these, the linen supply industry refers to a business in which textile products are washed, lent to use them, collected and washed after use, and then lent again. The areas of demand are hotel linens that handle hotel sheets, towels, bath towels, hospital linens as well as blankets, blanket covers, sheets, etc., and hospital rentals that handle work clothes at offices. , Other cloth diapers, towels and towels.

  When washing such linen, a continuous washing machine is used. However, continuous washing machines have less mechanical power than batch-type washing machines, and the washing concentration is higher than washing at home, and there are more items to be washed compared to the amount of water. There is concern about recontamination of dirt. Therefore, in order to realize a good cleaning up, improvement in high cleaning performance and prevention of soil recontamination are required.

  As a technique considering improvement in cleaning performance and improvement in prevention of soil recontamination, Patent Document 1 uses a specific cleaning aid composition, and a specific ratio of cleaning aids in the pre-washing tank and the main washing tank. The method of dividing and adding is disclosed. Patent Documents 2 and 3 disclose a cleaning method using a surfactant, a recontamination preventive agent, and an alkaline agent at a specific concentration, pH, and temperature. Patent Document 4 discloses a powder detergent composition in which two types of nonionic surfactant and soap are blended in a specific weight ratio.

On the other hand, in recent years, in consideration of the environment, in linen cleaning, for example, ISO 14000 is increasingly used by a user who uses a detergent that does not contain phosphorus. For this reason, it is desired to improve the washability and recontamination prevention property for detergents that do not contain phosphorus.
JP-A-2001-164290 Japanese Patent Publication No. 2006-297272 Japanese Patent Publication No. 2005-272577 Japanese Patent Publication No. 11-21598

  However, in patent document 1, since the process of adding the said post-processing agent separately from a detergent is required, an operation | work process becomes complicated. Patent Documents 2 and 3 are technologies suitable for the so-called dust control industry for cleaning textile products that are generally treated with an oil agent among linen supply industries such as mops and mats. There is no particular suggestion for improving the cleanability and anti-recontamination property when cleaning the water. Patent Document 4 is desired to further improve the cleaning performance.

  The subject of this invention is providing the powder detergent composition in which the outstanding washing | cleaning property and recontamination prevention property are obtained in the washing | cleaning by the linen supply using a continuous washing machine.

The present invention relates to (A) a nonionic surfactant represented by the following general formula (I) (hereinafter referred to as component (A)) 1 to 20% by weight, and (B) a polyacrylic acid having a weight average molecular weight of 1,000 to 10,000. Or a salt thereof [hereinafter referred to as component (B)] 0.01 to 2% by weight, (C) a water-soluble chelating agent (excluding those containing phosphorus) [hereinafter referred to as component (C)] 1 to 50% by weight, And (D) a powder detergent composition for linen supply containing 10 to 50% by weight of an alkali agent (hereinafter referred to as component (D)).
R ¹ −O− (EO) _p − (PO) _q − (EO) _r −H (I)
[Wherein, R ¹ represents an alkyl group or alkenyl group having 8 to 18 carbon atoms, EO represents an oxyethylene group, and PO represents an oxypropylene group. p, q, and r represent average addition mole numbers, respectively, p> 0, r> 0, q = 1-6, and p + r = 4-20. ]

  Further, the present invention is a cleaning method for cleaning an object by a continuous washing machine using a cleaning liquid in which the powder detergent composition for linen supply of the present invention is dissolved in water, and the concentration of the composition in the cleaning liquid Relates to a cleaning method in which the weight ratio of the cleaning object to water is 0.01 to 0.3% by weight and the weight ratio of the cleaning object to water is 1/20 to 1/2.

  ADVANTAGE OF THE INVENTION According to this invention, the powder detergent composition for linen supplies excellent in the washability and the recontamination prevention property is obtained. The composition of the present invention is suitable as a powder detergent composition for the linen supply industry using a continuous washing machine.

<(A) component>
The component (A) of the present invention is a component mainly used for detergency and low foaming properties. In general formula (I), R ¹ has preferably 10 to 14 carbon atoms. Further, p is preferably 2 to 10, particularly 2 to 7, r is preferably 2 to 10, particularly 3 to 7, and q is preferably 1 to 5. From the viewpoint of low foaming properties, q is further 3 to 5, particularly 4 to 5. Is preferred. p + r is preferably 5 to 15, particularly 5 to 12, and p + q + r is preferably 5 to 20, more preferably 7 to 17, and particularly preferably 7 to 15. In this range, it is more suitable for the purpose of the powder detergent composition for linen supply having excellent detergency and anti-recontamination property.

  The content of the component (A) in the composition of the present invention is 1 to 20% by weight, preferably 5 to 18% by weight, and more preferably 10 to 15% by weight in terms of cleaning performance.

<(B) component>
(B) component of this invention is a component mainly used as a dispersing agent. Carboxylic acid-based polymers such as component (B) are known as dispersants and anti-staining agents, but have a specific structure in washing at a high detergent concentration and low bath ratio with a continuous washing machine in a linen supply, It has been found that polymers of specific molecular weight show a significant effect.

  The component (B) is polyacrylic acid having a weight average molecular weight of 1,000 to 10,000 or a salt thereof, and the salt may be part or all. Examples of the salt include alkali metal salts such as sodium salt and potassium salt. Moreover, the weight average molecular weight of (B) component is 1000-10000, Preferably it is 3000-6000. This weight average molecular weight is measured by GPC (gel permeation chromatography) using polyethylene glycol as a standard substance.

  The content of the component (B) in the composition of the present invention is 0.01 to 2% by weight, preferably 0.05 to 1% by weight, from the viewpoint of re-contamination prevention and biodegradability, 1 to 0.5% by weight is more preferable.

<(C) component>
The component (C) of the present invention is a component mainly used for cleaning performance and hard water resistance. Component (C) is ethylenediaminetetraacetic acid, hydroxyethylethylenediaminetriacetic acid, diethylenetriaminepentaacetic acid, triethylenetetraminehexaacetic acid, nitrilotriacetic acid, ethyleneglycose bis (2-aminoethylether) tetraacetic acid, citric acid, gluconic acid, hydroxybenzyl One or more kinds selected from iminoacetic acid, iminodiacetic acid and salts thereof are preferred. Furthermore, one or more kinds consisting of ethylenediaminetetraacetic acid, nitrilotriacetic acid and salts thereof are preferable, and more preferably one or more kinds selected from the group consisting of nitrilotriacetic acid and salts thereof. Since it is easy to form a water-insoluble substance by combining with an alkaline earth metal salt in tap water, those containing phosphorus are excluded from the component (C).

  Moreover, content of (C) component in the composition of this invention is 1-50 weight%, 5-45 weight% is preferable and 10-35 weight% is further more preferable.

<(D) component>
The component (D) of the present invention is a component mainly used for improving detergency, and the component (D) is selected from hydroxides, silicates and carbonates of alkali metals or alkaline earth metals. One or more are preferred. Examples of the alkali metal or alkaline earth metal hydroxide include sodium hydroxide, potassium hydroxide, and calcium hydroxide. As alkali metal salt or alkaline earth metal salt of silicic acid, sodium silicate such as No. 1 sodium silicate, No. 2 sodium silicate, No. 3 sodium silicate, sodium orthosilicate, sodium metasilicate, potassium silicate, etc. are alkali metal carbonates. Examples of the salt or alkaline earth metal salt include sodium sesquicarbonate and potassium carbonate. A borate such as sodium borate can also be used.

  (D) As a component, from a viewpoint of a detergency improvement, carbonate, a metasilicate, and a silicate are preferable, Especially preferably, it is sodium carbonate. Moreover, content of (D) component in the composition of this invention is 10 to 50 weight%, 10 to 45 weight% is preferable and 10 to 35 weight% is further more preferable.

<Other ingredients>
Moreover, the powder detergent composition for linen supply of this invention can contain surfactant other than (A) component. As the surfactant other than (A), one or more selected from nonionic surfactants other than the component (A), anionic surfactants, cationic surfactants and amphoteric surfactants are preferable.

  (A) Nonionic surfactants other than the component include sorbitan fatty acid ester, polyoxyalkylene sorbitan fatty acid ester, polyoxyalkylene fatty acid ester, glycerin fatty acid ester, polyoxyalkylene polyglycerin fatty acid ester, polyglycerin fatty acid ester, polyoxy Alkylene polyglycerin fatty acid ester, sucrose fatty acid ester, resin acid ester, polyoxyalkylene resin acid ester, polyoxyalkylene alkyl ether other than component (A), polyoxyalkylene phenyl ether, alkyl (poly) glycoside, polyoxyalkylene Examples thereof include alkyl (poly) glycosides. Preferably, an ether group-containing nonionic surfactant and an ester group-containing nonionic surfactant other than the component (A) not containing a nitrogen atom are used.

  Examples of the anionic surfactant include carboxylic acid-based surfactants, sulfonic acid-based surfactants, sulfate ester-based surfactants, and phosphate ester-based surfactants. Carboxylic acid and phosphate ester surfactants are preferred. Examples of the carboxylic acid surfactant include polyvalent carboxylates, polyoxyalkyl ether carboxylates, polyoxyalkylene alkylamide ether carboxylates, rosinates, dimer salts, and polymer acid salts. Examples of the sulfonic acid surfactant include alkylbenzene sulfonate, alkyl sulfonate, alkyl naphthalene sulfonate, naphthalene sulfonate, diphenyl ether sulfonate, alkyl naphthalene sulfonic acid condensate salt, and naphthalene sulfonic acid. And the like. Examples of sulfate surfactants include alkyl sulfates, polyoxyalkylene alkyl sulfates, polyoxyalkylene alkyl phenyl ether sulfates, tristyrenated phenol sulfates, polyoxyalkylene distyrenated phenol sulfates. And alkyl polyglycoside sulfate. Examples of the phosphate ester surfactant include alkyl phosphate ester salts, alkylphenyl phosphate ester salts, polyoxyalkylene alkyl phosphate ester salts, polyoxyalkylene alkylphenyl phosphate ester salts, and the like. Examples of the salt include metal salts (Na, K, Ca, Mg, Zn, etc.), ammonium salts, alkanolamine salts, aliphatic amine salts, and the like.

  Examples of amphoteric surfactants include amino acids, betaines, imidazolines, and amine oxides. Examples of the amino acid system include acyl amino acid salts, acyl sarcosine salts, acyloylmethylaminopropionates, alkylaminopropionates, acylamidoethylhydroxyethylmethylcarboxylates, and the like. Examples of the betaine type include alkyl dimethyl betaine, alkyl hydroxyethyl betaine, acylamidopropyl hydroxypropyl ammonia sulfobetaine, acylamidopropyl hydroxypropyl ammonia sulfobetaine, amidopropyl dimethylcarboxymethyl ammobetaine ricillinate. Examples of the imidazoline series include alkyl carboxymethyl hydroxyethyl imidazolium betaine, alkyl ethoxy carboxymethyl imidazolium betaine, and the like. Examples of amine oxides include alkyldimethylamine oxide, alkyldiethanolamine oxide, alkylamidopropylamine oxide, and the like.

  Moreover, the component known to mix | blend with a detergent can be mix | blended with the powder detergent composition for linen supplies of this invention as an arbitrary component. As such optional components, (1) color transfer inhibitors such as polyvinylpyrrolidone, (2) enzymes such as amylase, protease, lipase and cellulase, (3) enzyme stability such as calcium chloride, formic acid and boric acid (boron compound) (4) fluorescent dye, (5) silicone for the purpose of imparting flexibility, (6) silica as an antifoaming agent, silicone, (7) antioxidant, (9) other bluing agent, A fragrance | flavor, an antimicrobial preservative, etc. are mentioned.

The form of the detergent composition of the present invention is a powder, and the bulk density is preferably 0.5 to 1 g / cm ³ .

  Commercial detergents are used for cleaning at a higher concentration and lower bath ratio than those for household use, so they are better at preventing soil recontamination, and “bake” (alkaline production) that occurs when alkaline agents remain after rinsing. Is required not to occur. The powder detergent composition for linen supply according to the present invention is excellent in detergency, low foaming property, anti-recontamination property, and hardly causes alkali burn. Therefore, the powder detergent composition for linen supply for water-based cleaning using a commercial washing machine It is suitable as a product.

  The powder detergent composition for linen supply of the present invention is a cleaning liquid dispersed in water, preferably the total content of (A), (B), (C), (D) components [(A) + (B) + ( C) + (D)] is 0.01 to 0.3% by weight, preferably 0.03 to 0.2% by weight, more preferably 0.07 to 0.15% by weight for washing clothes. Used. The cleaning liquid preferably has a pH at 20 ° C. of 10 or more, more preferably 10.5 to 12, and the amount of the component (D) is preferably adjusted to be within this range. In addition, it is preferable that pH is the said range in the temperature at the time of washing | cleaning.

  Further, in the powder detergent composition for linen supply of the present invention, the weight ratio of the component (A) to the component (B) is (A) / (B) = 25/1 from the viewpoint of detergency and re-contamination prevention. ˜250 / 1, more preferably 50/1 to 200/1.

  Moreover, the powder detergent composition for linen supply of this invention is (A) / (C) = 1 / 30-1 from the viewpoint of washing | cleaning property and powder physical property, and the weight ratio of (A) component and (C) component. / 1, more preferably 1/3 to 1/1.

  Moreover, the powder detergent composition for linen supply of this invention is (A) / (D) = 1 / 10-1 from the viewpoint of a washability and a powder physical property, (A) / (D) component weight ratio. / 1, more preferably 1/5 to 1/1.

  The powder detergent composition for linen supply according to the present invention is a washing method for washing an object by a continuous washing machine using a washing liquid in which the composition is dissolved in water, and the weight ratio of the washing object to water is the object to be washed. It is suitably used for a cleaning method in which product / water = 1/20 to 1/2. Here, the continuous washing machine is an apparatus provided with means for continuously performing pre-washing, main washing, and rinsing, as described in, for example, Japanese Patent Application Laid-Open No. 2001-1280876. In recent years, it has been widely used in the field of linen supply because it can be washed in a short time. The treatment process using a continuous washing machine includes pre-washing, main washing, and rinsing steps. The washing liquid of the powder detergent composition for linen supply of the present invention prepared to a predetermined concentration is usually washed by an automatic feeder. It is put into a cleaning system for performing the process.

  The object to be cleaned can be applied to all textile products handled by the linen supply, but preferably contains at least one selected from the group consisting of sheets, covers, towels, towels, kitchen apparel, and medical personnel apparel.

  The following evaluation was performed using the powder detergent composition shown in Table 1. The results are shown in Table 1.

(1) Cleanability (sebum dirt)
Apply 2g of model sebum soil (composition: 60% by weight of cottonseed oil, 10% by weight of oleic acid, 10% by weight of palmitic acid, 10% by weight of solid paraffin, 10% by weight of liquid paraffin) uniformly on 10cm x 10cm cotton cloth. A soiled cloth was prepared. A cleaning liquid containing 0.1% by weight of the composition shown in Table 1 (the remainder having a hardness of 4 ° DH) containing four sheets (8 g) of sebum-stained soil and a plurality of white cotton cloths (42 g) cut into 6 cm × 6 cm. Using 1000 ml of water), it was washed (50 ° C. × 10 minutes) with a turgotometer (MS-8210) manufactured by Ueshima Seisakusho, and the reflectance of the cloth before and after washing was determined by a color difference meter manufactured by Nippon Denshoku Industries Co., Ltd. (SE2000) was measured (measurement wavelength 550 nm), and the cleaning rate (%) was calculated by the following formula.

The cleaning rate (average value of four contaminated cloths) is shown in Table 1. The numerical value of the cleaning rate is evaluated according to the following criteria. In this evaluation, a difference of several points (several%) when the cleaning rate exceeds 30% is clearly recognized visually, and as a clear difference between the cleaning rate of 30% or more and less than 30% It can be recognized.
A: Excellent cleaning performance (cleaning rate of 40% or more)
○: Slightly superior (cleaning rate of 30% or more and less than 40%)
×: Inferior (cleaning rate less than 30%)

(2) Recontamination preventing property 1000 ml of a cleaning liquid containing 0.1% by weight of the composition shown in Table 1 (the balance is water having a hardness of 4 ° DH) was prepared. After adding 0.25 g of carbon black to the cleaning liquid and dispersing it, a plurality of white cotton cloths (50 g in total) cut into 6 cm × 6 cm were fed as evaluation cloths. Of these, four arbitrarily selected were used for calculating the recontamination prevention rate. Washed with Ueshima Seisakusho Targotometer (MS-8210) (rotation speed 80 rpm / temperature 50 ° C. × 10 minutes), and the reflectance of cotton white cloth before and after washing was made by Nippon Denshoku Industries Co., Ltd. Measurement was performed with a color difference meter (SE2000) (measurement wavelength: 550 nm), and the recontamination prevention rate (%) was calculated by the following formula.

The recontamination prevention rate (average value of four cotton white cloths) is shown in Table 1. The recontamination prevention value is evaluated according to the following criteria.
◎: Dirt is not attached (Re-contamination prevention is 70% or more)
○: Only a small amount of dirt is attached (recontamination preventing property is 60% or more and less than 70%)
X: Dirt is clearly adhered (recontamination preventing property is less than 60%)

* Nonionic surfactant (1): R ¹ in the general formula (I) is an alkyl group having 8 to 18 carbon atoms (alkyl group derived from coconut oil), p is 5, q is 4.5, and r is 5 Nonionic surfactant [trade name: Emulgen MS110, manufactured by Kao Corporation]
* Nonionic surfactant (2): Polyoxyethylene lauryl ether [trade name: Emulgen 109P, manufactured by Kao Corporation]
* NTA trisodium: nitrilotriacetic acid trisodium salt (trade name: Dissolvin A-92, manufactured by Akzo Nobel Co., Ltd.)
* Sodium polyacrylate [trade name: Aqualic DL-100, manufactured by Nippon Shokubai Co., Ltd., weight average molecular weight 4000]
* Acrylic acid / maleic acid copolymer [trade name: Socaran CP-5, manufactured by BASF Japan Ltd., weight average molecular weight 70000]
* Sodium carbonate [Product name: Sodium carbonate (soda ash), manufactured by Central Glass Co., Ltd.]
* Sodium sulfate [Product name: Neutral anhydrous sodium sulfate (AO), manufactured by Shikoku Kasei Kogyo Co., Ltd.]

Claims (4)

(A) 1 to 20% by weight of a nonionic surfactant represented by the following general formula (I), (B) 0.01 to 2% by weight of polyacrylic acid having a weight average molecular weight of 1,000 to 10,000 or a salt thereof, (C 1) One or more water-soluble chelating agents selected from the group consisting of nitrilotriacetic acid and salts thereof (excluding those containing phosphorus) 1 to 50% by weight, and (D) an alkaline agent 10 to 50% by weight. Powder detergent composition.
R ¹ −O− (EO) _p − (PO) _q − (EO) _r −H (I)
[Wherein, R ¹ represents an alkyl group or alkenyl group having 8 to 18 carbon atoms, EO represents an oxyethylene group, and PO represents an oxypropylene group. p, q, and r represent average addition mole numbers, respectively, p> 0, r> 0, q = 1-6, and p + r = 4-20. ] (D) an alkali agent, a hydroxide of alkali metal or alkaline earth metal, silicates and carbonates, with from one or more selected group of claim 1 Linen Supply powder detergent composition according comprising a. A cleaning method for cleaning an object with a continuous washing machine using a cleaning liquid obtained by dissolving the powder detergent composition for linen supply according to claim 1 or 2 in water, wherein the concentration of the composition in the cleaning liquid is 0.00. A cleaning method in which the weight ratio of the object to be cleaned and water is 01 to 0.3% by weight and the object to be cleaned / water is 1/20 to 1/2. The cleaning method according to claim 3 , wherein the object to be cleaned contains at least one selected from the group consisting of sheets, covers, towels, towels, kitchen clothing, and medical personnel clothing.