JP2005273062A - Method for cleansing textile product - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for cleansing textile products in the field of linen supplies including sheets, wrapping cloths and towels in hotels and hospitals using hydrogen peroxide as a bleaching agent so as to sufficiently maintain its bleaching power and yield high bleaching and cleansing effects on the textile products. <P>SOLUTION: The method for cleansing a textile product comprises the 1st step of cleansing the textile product using a cleansing medium comprising water, a surfactant and a water-soluble chelating agent in an amount greater than the theoretical level necessary for scavenging the total hardness component in the water, and the 2nd step of cleansing the resultant textile product using a cleansing medium comprising water, hydrogen peroxide, a surfactant and the water-soluble chelating agent in an amount less than the theoretical level necessary for scavenging the total hardness component in the water. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a method for cleaning textile products, and preferably relates to a cleaning method for cleaning linens such as sheets, cloths and towels in hotels and hospitals in the field of linen supply. In contrast, the present invention relates to a cleaning method that provides an excellent bleaching effect and cleaning effect.

  In order to clean linens such as sheets in hotels and hospitals, wrapping cloths, towels, in addition to basic cleaning agents, alkaline agents, chelating agents and bleaching agents are used in combination, and cleaning conditions are set according to the on-site environment. It is carried out. In particular, with regard to the bleaching agent, a chlorine bleaching agent or an oxygen bleaching agent is used. In the chlorine bleaching agent, sodium hypochlorite is mainly used, and in the oxygen bleaching agent, hydrogen peroxide is mainly used. Of these, sodium hypochlorite has a strong bleaching power, but it tends to damage the fabric of the object to be washed or discolor the colored pattern. Although hydrogen peroxide is inferior in bleaching power to sodium hypochlorite, it has been difficult to develop sufficient bleaching power.

So far, in order to improve the bleaching power of oxygen bleach, research on bleach activators using organic peracids, bleach activation catalysts containing metal atoms, and hydrogen peroxide decomposition inhibitors There are various things. For example, tetraacetylethylenediamine is generally used for the bleach activator, and Patent Document 1 discloses that alkanoylglycoloxybenzene sulfonate is useful. Regarding the bleaching active catalyst, Patent Document 2 shows that the manganese catalyst has an excellent bleaching effect. Furthermore, regarding hydrogen peroxide decomposition inhibition, Patent Document 3 discloses a composition in which a bleaching activation catalyst having a specific structure, a phenol-based radical trapping agent, and a phosphonic acid-based metal scavenger are combined. Patent Document 4 discloses a cleaning composition for a linen supply containing a specific nonionic surfactant, a water-soluble chelating agent, and an alkaline agent. Patent Document 5 discloses a cleaning method for hospital bedding, in which pre-cleaning is performed with an aqueous solution containing a polyvalent carboxylic acid or oxycarboxylic acid, followed by main cleaning with an aqueous solution containing a bleaching agent or the like.
US Pat. No. 4,778,618 JP-A-4-216899 JP 2003-89800 A JP 2002-138298 A JP 11-229271 A

  However, in the bleaching and cleaning of textile products using hydrogen peroxide, it is desired to obtain a bleaching effect and a cleaning effect at a higher level. The present invention relates to a method for cleaning linens such as textiles, especially hotel and hospital sheets, wrappings, and towels, in the field of linen supply, and provides excellent bleaching and cleaning effects to dyed textiles. It is an object to provide a cleaning method.

  The present invention uses a cleaning medium (hereinafter referred to as a cleaning liquid (A)) containing a surfactant, water, and a water-soluble chelating agent in an amount greater than the theoretical value necessary for capturing all hardness components in the water. A first step of washing the textile product (hereinafter referred to as the first step), a surfactant, hydrogen peroxide, water and an amount of water less than the theoretical value necessary to capture all the hardness components in the water. A fiber having a second step (hereinafter referred to as the second step) for cleaning the fiber product cleaned in the first step using a cleaning medium (hereinafter referred to as a cleaning liquid (B)) containing a sex chelating agent. The present invention relates to a method for cleaning products.

  By the cleaning method of the present invention, in particular, in the field of linen supply such as a hotel, hospital sheet, wrapping, towel, etc., in the cleaning using hydrogen peroxide as a bleaching agent, an excellent bleaching effect can be obtained for textiles. Can do.

  Examples of the water-soluble chelating agent used in the present invention include ethylenediaminetetraacetic acid, hydroxyethylethylenediaminetriacetic acid, diethylenetriaminepentaacetic acid, nitrotriacetic acid, triethylenetetraminehexaacetic acid, phosphonic acid, tripolyphosphoric acid, nitriloacetic acid, ethylene glycose bis (2- Aminoethyl ether) tetraacetic acid, citric acid, maleic acid, polyacrylic acid, isoamylene-maleic acid copolymer, acrylic acid-maleic acid copolymer, acrylic acid-methacrylic acid copolymer, gluconic acid, hydroxybenzyliminoacetic acid , One or more selected from iminodiacetic acid and salts thereof are preferred. Furthermore, one or more types consisting of nitriloacetic acid, tripolyphosphoric acid and salts thereof are preferable, and one or more types consisting of tripolyphosphoric acid and salts thereof are particularly preferable.

  In the cleaning liquid (A) used in the first step, the water-soluble chelating agent is used in an amount higher than the theoretical value that captures all the hardness components in the water of the cleaning liquid, but preferably 1 to 5 times the theoretical value. . Further, the water-soluble chelating agent is used in the cleaning liquid (B) used in the second step in an amount less than the theoretical value that captures all the hardness components in the water of the cleaning liquid. 8 times, more preferably 0 to 0.4 times.

The hardness components in water are calcium and magnesium, and the total hardness component amount is expressed by the concentration of the calcium compound in the unit guess by German hardness, American hardness and the like. For German hardness, the amount of total hardness component converted to CaO is expressed in mg / 100 mL of water (unit: ° DH), and for American hardness, the amount of total hardness component converted to CaCO ₃ is expressed in mg / L (ppm). Both have a relationship of American hardness (ppm) = German hardness (° DH) × 17.85.

On the other hand, since the chelating agent can know the amount of CaCO ₃ trapped per unit weight of the compound by the electric conductivity titration method, the water hardness and the amount of CaCO ₃ trapped by the chelating agent can be used to determine the amount of CaCO ₃ trapped in the target water. A theoretical value of the amount of chelating agent required to capture all hardness components can be calculated. For example, since sodium tripolyphosphate has a CaCO ₃ trapping amount of 460 mg / g, when water having a hardness of 6 ° DH (total hardness component concentration is 107.1 mg / L as CaCO ₃ ) is used, the total hardness component is trapped. For this purpose, 0.233 g (calculated by 107.1 / 460) per 1 L of this water is required. This amount is a theoretical value.

  The theoretical value of the chelating agent necessary to capture all the hardness components in the water of the cleaning medium is based on the amount of water in the actual cleaning medium, but the amount of components other than water in the cleaning medium is very small. In some cases, it can be approximated by a theoretical value of a water-soluble chelating agent based on 100% by weight of the water.

  The cleaning liquid (A) used in the first step is obtained by adding water-soluble chelating agent in an amount higher than the theoretical value necessary for capturing all the hardness components in the water. The hardness of the water used for the cleaning liquid (A) is desirably low, and is preferably 2 to 20 ° DH, more preferably 2 to 15 ° DH, and particularly preferably 2 to 10 ° DH. The cleaning liquid (B) used in the second step is obtained by adding to the water a water-soluble chelating agent in an amount less than the theoretical value necessary to capture all the hardness components in the water. The hardness of water used for the cleaning liquid (B) is preferably 2 to 20 ° DH. In the actual use scene, the same water is often used for the preparation of the cleaning liquid (A) and the cleaning liquid (B), so the hardness of the water is 2-20 ° DH, 2-15 ° DH, especially 2 It is preferably selected from the range of -10 ° DH.

  Moreover, as for the washing | cleaning liquid (A) used at a 1st process, and the washing | cleaning liquid (B) used at a 2nd process, pH10 or more is all preferable in washing | cleaning temperature. In order to adjust to such pH, the cleaning liquid (A) and the cleaning liquid (B) preferably contain an alkaline agent. Examples of the alkali agent include No. 1 sodium silicate, No. 2 sodium silicate, No. 3 sodium silicate, sodium carbonate, sodium hydroxide, potassium hydroxide, sodium sesquicarbonate, sodium borate, sodium orthosilicate, sodium metasilicate, and the like. .

  The cleaning liquid (A) has a pH of 10 or more, more preferably 10 to 12.5, and particularly preferably 10 to 12 at the cleaning temperature. Further, the cleaning liquid (B) preferably has a pH of 10.5 or more, more preferably 10.5 to 12.5, and particularly preferably 11 to 12 at the cleaning temperature. The alkaline agent is preferably used so that such a pH can be achieved.

  The temperature of the cleaning liquid (A) used in the first step is preferably 20 to 80 ° C., more preferably 30 to 70 ° C., and particularly preferably 40 to 60 ° C. The washing time is preferably 5 to 15 minutes.

  The temperature of the cleaning liquid (B) used in the second step is preferably 50 to 90 ° C, more preferably 50 to 85 ° C, and particularly preferably 60 to 80 ° C. The washing time is preferably 5 to 15 minutes.

  Since the cleaning liquid (A) used in the first step contains a water-soluble chelating agent, the same substance may be carried over to the subsequent steps. Therefore, it is preferable to perform dehydration after washing in the first step.

  The cleaning liquid (B) used in the second step contains a surfactant. Furthermore, the cleaning liquid (A) used in the first step can also contain a surfactant. Surfactant can be mix | blended as detergent containing surfactant, a builder, etc.

As the surfactant, one or more selected from nonionic surfactants, cationic surfactants, amphoteric surfactants and anionic surfactants are preferable.

  Nonionic surfactants include sorbitan fatty acid esters, polyoxyalkylene sorbitan fatty acid esters, polyoxyalkylene fatty acid esters, glycerin fatty acid esters, polyoxyalkylene glycerin fatty acid esters, polyglycerin fatty acid esters, polyoxyalkylene polyglycerin fatty acid esters, Examples thereof include sugar fatty acid esters, resin acid esters, polyoxyalkylene alkyl ethers, polyoxyalkylene alkyl phenyl ethers, alkyl (poly) glycosides, polyoxyalkylene (poly) glycosides, and the like. Preferably, an ether group-containing nonionic surfactant containing no nitrogen atom and an ester group-containing nonionic surfactant containing no nitrogen atom are used.

  Examples of the anionic surfactant include carboxylic acid-based surfactants, sulfonic acid-based surfactants, sulfate ester-based surfactants, and carboxylic acid-based surfactants. Examples of the carboxylic acid-based surfactant include fatty acids having 6 to 30 carbon atoms or salts thereof, polyvalent carboxylates, polyoxyalkylene alkyl ether carboxylates, polyoxyalkylene alkylamide ether carboxylates, rosinates, Dimer acid salt, polymer acid salt, tall oil fatty acid salt and the like can be mentioned. Examples of the sulfonic acid surfactant include alkylbenzene sulfonate, alkyl sulfonate, alkyl naphthalene sulfonate, naphthalene sulfonate, diphenyl ether sulfonate, condensate salt of alkyl naphthalene sulfonate, and naphthalene sulfonate. Examples include condensate salts. Examples of sulfate ester surfactants include alkyl sulfate esters, polyoxyalkylene alkyl sulfates, polyoxyalkylene alkyl phenyl ether sulfates, tristyrenated phenyl sulfates, alkyl polyglycoside sulfates, and the like. Examples of the phosphate ester surfactant include alkyl phosphate ester salts, alkylphenyl phosphate ester salts, polyoxyalkylene alkyl phosphate ester salts, alkylphenyl phosphate ester salts, and the like. Examples of the salt include metal salts (Na, K, Ca, Mg, Zn, etc.), ammonium salts, alkanolamine salts, fatty acid amine salts, and the like.

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

  The concentration of the surfactant is preferably 0.001 to 0.5% by weight in the cleaning liquid (B), and more preferably 0.001 to 0.05% by weight. The cleaning liquid (A) can also contain the surfactant in the same range as described above.

As the surfactant, a nonionic surfactant represented by the following general formula (I) is preferable. When this surfactant is used, it may be added to either the cleaning liquid (A) or the cleaning liquid (B), but both preferably contain the surfactant.
_{^{R 1 -O- (EO) p -}} (PO) q - (EO) r -H (I)
[Wherein, R ¹ represents an alkyl group or alkenyl group having an average carbon number of 8 to 18, 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 + q + r = 4-20. ]

In general formula (I), R ¹ is preferably an alkyl group having 10 to 14 carbon atoms, an alkenyl group, and further an alkyl group, p is preferably 1 to 10, particularly 2 to 8, and q is 0.5 to 4. 5, 1 to 4.5, particularly 1 to 2 are preferable, r is preferably 1 to 10, particularly preferably 2 to 8, and p + r is preferably 1 to 30, more preferably 2 to 20, and particularly preferably 4 to 15. Specific examples of the nonionic surfactant of the general formula (I) include polyoxyethylene (2.5) polyoxypropylene (1.5) polyoxyethylene (3) lauryl ether, polyoxyethylene (3) polyoxypropylene (1.5) polyoxyethylene (3) lauryl ether, polyoxyethylene (5) polyoxypropylene (1.5) polyoxyethylene (5) lauryl ether, polyoxyethylene (5) polyoxypropylene (4.5 ) Polyoxyethylene (5) lauryl ether. Here, regarding the said compound, the inside of () is the average addition mole number of ethylene oxide or propylene oxide (the same applies hereafter). Two or more nonionic surfactants can be used.

  The nonionic surfactant represented by the general formula (I) in the cleaning liquid (A) is 0.0001 to 0.5% by weight, more preferably 0.001 to 0.05% by weight, in the cleaning liquid (B). Is preferably used at a concentration of 0.0001 to 0.05% by weight.

  The cleaning liquid (B) used in the second step contains hydrogen peroxide. From the viewpoint of obtaining a sufficient bleaching effect, the concentration of hydrogen peroxide in the cleaning liquid (B) is preferably 0.001 to 0.5% by weight, more preferably 0.005 to 0.1% by weight.

  In addition, in the cleaning liquid (A) and the cleaning liquid (B), components that are conventionally known to be blended in a textile product cleaning agent or the like can be blended as optional components. As such optional components, (1) monohydric alcohols such as ethanol, ethylene glycol, glycols such as polyethylene glycol and propylene glycol having a weight average molecular weight of 200 to thousands, (2) paratoluenesulfonic acid, benzoate (There is also an effect as a preservative) and a thickener and solubilizer such as urea, (3) a phase modifier and polyoxyalkylene benzyl ether, polyoxyalkylene phenyl ether for improving detergency, (4) (5) Enzymes such as amylase, protease, lipase, cellulase, (6) Enzyme stabilizers such as calcium chloride, calcium sulfate, formic acid, boric acid (boric acid compound), (7) ) Fluorescent dye, (8) Silicone for imparting flexibility, (9) Butylhydroxytoluene Distyrenated cresol, sodium sulfite, antioxidants such as sodium bisulfite, (10) Other in bluing agents, perfumes, and antimicrobial preservatives and the like.

  In this invention, although a 2nd process is performed after a 1st process, each process can also be performed in multiple numbers, and it is also preferable to perform multiple 2nd processes. When any of the steps is performed a plurality of times, it is sufficient that the second step is performed after at least the first step. Moreover, the other process which does not correspond to these can also be performed between a 1st process and a 2nd process.

Examples 1-10 and Comparative Examples 1-6
Using a cocoa-contaminated cloth (Swiss EMPA No. 112 cotton) and cleaning liquid (A) shown in Tables 1 and 2 at a cleaning temperature of 40 ° C. for 5 minutes, a rotational speed of 80 rpm, a cleaning power measuring device (manufactured by Ueshima Seisakusho After washing and rinsing, the washing rate was evaluated with the washing solution (B) at a washing temperature of 70 ° C. for 5 minutes with the same apparatus at a rotation speed of 80 rpm. The evaluation results are shown in Tables 1 and 2. The washing rate of the cocoa-contaminated cloth was calculated by the following equation by measuring the reflectance of the cloth before and after washing (measurement wavelength: 440 nm). The cocoa-contaminated cloth is a contaminated cloth that is difficult to bleach and wash, and the high washing rate in Tables 1 and 2 means that the bleaching performance is higher.

Washing rate (%) = [(reflectance after washing−reflectivity before washing) ÷ (reflectance of white cloth−reflectivity before washing)] × 100

(note)
-Sodium tripolyphosphate: CaCO ₃ capture amount 460 mg / g
Nitrilotriacetic acid trisodium: CaCO ₃ trapping amount 440 mg / g
・ Ethylenediaminetetraacetic acid tetrasodium: CaCO ₃ capture amount 288 mg / g
Sodium polyacrylate: Selesche 100, manufactured by Kao Corporation, CaCO ₃ trapping amount 200 mg / g
・ Trisodium citrate: Captured amount of CaCO ₃ 310mg / g
-Sodium maleate: CaCO ₃ capture amount 22 mg / g
Nonionic surfactant (1): Emulgen LS106, manufactured by Kao Corporation Nonionic surfactant (2): Emulgen LS110, manufactured by Kao Corporation

  The theoretical value of the chelating agent necessary for capturing all the hardness components in 4 ° DH water used in Tables 1 and 2 is 0.016% by weight of sodium tripolyphosphate, nitrilotriline as the weight ratio to the water. 0.016% by weight of trisodium acetate, 0.025% by weight of tetrasodium ethylenediaminetetraacetate, 0.036% by weight of sodium polyacrylate, 0.023% by weight of trisodium citrate, and 0.02% by weight of sodium maleate. 324% by weight.

  The initial (immediately after preparation) effective oxygen concentration of the cleaning liquids (B) of Examples 1 to 10 and Comparative Examples 1 to 6 was 0.008% by weight. Here, the effective oxygen concentration was measured in accordance with JIS K 3362 7.9.

  From the results of Tables 1 and 2, in the first step, a cleaning liquid (A) containing a surfactant, water, and a water-soluble chelating agent in an amount greater than the theoretical value necessary for capturing the total hardness component in water is used. In the second step, the cleaning liquid contains a surfactant, hydrogen peroxide, and water, and the water-soluble chelating agent is suppressed to less than the theoretical value necessary for supplementing the total hardness component in the water. It has been found that by using (B) to wash, excellent bleaching and cleaning effects can be obtained in the treatment of textile products using hydrogen peroxide.

Claims (6)

A first step of washing a textile product with a washing medium comprising a surfactant, water and a water-soluble chelating agent in an amount greater than a theoretical value necessary to capture all hardness components in the water; Washed in the first step using a washing medium containing an activator, hydrogen peroxide, water and a less than theoretical amount of a water-soluble chelating agent necessary to trap all hardness components in the water. And a second step of cleaning the textile product. The method for washing a textile product according to claim 1, wherein the water-soluble chelating agent is sodium tripolyphosphate. The method for cleaning a textile product according to claim 1 or 2, wherein the pH of the cleaning medium used in the first step is 10 or more, and the pH of the cleaning medium used in the second step is 10.5 or more. . The temperature of the cleaning medium used in the first step is 20 to 80 ° C, and the temperature of the cleaning medium used in the second step is 50 to 90 ° C. How to wash textile products. The method for washing a textile product according to any one of claims 1 to 4, wherein in the first step, dehydration is performed after washing. The method for cleaning a textile product according to any one of claims 1 to 5, wherein the surfactant is a nonionic surfactant represented by the following general formula (I).
_{^{R 1 -O- (EO) p -}} (PO) q - (EO) r -H (I)
[Wherein, R ¹ represents an alkyl group or alkenyl group having an average carbon number of 8 to 18, 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 + q + r = 4-20. ]