JP2005068327A - Detergent - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a detergent with little foaming ability, little corrosiveness and great detergency, and for example, useful for an automatic dishwasher. <P>SOLUTION: This detergent comprises a water-soluble polysaccharide and/or its derivative. Preferably, the water-soluble polysaccharide is cyclodextrin or its derivative. It is preferred that an inorganic salt, in particular, sodium sulfate is added to the detergent and furthermore an inorganic powder and enzymes are added. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a cleaning agent useful as a cleaning agent for an automatic dishwasher, for example.

As conventional detergents for automatic dishwashers, those mainly composed of an alkaline agent such as sodium hydroxide, potassium hydroxide, phosphate, silicate and the like are provided (see, for example, Patent Documents 1 to 5).
However, the cleaning agent is a strong alkali, the tableware is easily corroded, and there is a risk of environmental pollution due to the alkali of the cleaning waste liquid.
Then, what has a nonionic surfactant as a main component is provided as a washing | cleaning agent which does not use an alkaline agent (for example, refer patent documents 6-8).

Japanese Patent Laid-Open No. 11-181475 Japanese Patent Application No. 2002-3892 Japanese Patent Laid-Open No. 3-100100 JP-A-5-78697 JP-A-1-198699 JP-A-6-33100 Japanese Patent Laid-Open No. 11-61179 Japanese Patent Application No. 2000-144181

  However, those containing a nonionic surfactant as a main component have foaming properties, and there is a problem that a large amount of bubbles are generated when sprayed from a nozzle to tableware in an automatic dishwasher.

The present invention provides a cleaning agent comprising a water-soluble polysaccharide and / or a water-soluble polysaccharide derivative as a means for solving the above conventional problems.
The water-soluble polysaccharide and / or water-soluble polysaccharide derivative is preferably a cyclodextrin and / or a cyclodextrin derivative.
In addition, an inorganic salt is preferably added to the cleaning agent, the inorganic salt is preferably sodium sulfate, and further, an inorganic powder and enzymes are preferably added to the cleaning agent.
The present invention is described in detail below.

  In the present invention, it is possible to obtain a cleaning agent with less foaming, low corrosivity, and excellent cleaning power.

The cleaning agent of the present invention contains a water-soluble polysaccharide and / or a water-soluble polysaccharide derivative (hereinafter abbreviated as polysaccharide) as a main component. Examples of the polysaccharide include cellulose derivatives such as methylcellulose, ethylcellulose, methoxycellulose, ethoxycellulose, carboxymethylcellulose, and cationized cellulose; starches such as soluble starch and cationized starch; dextrin, dextran, cyclodextrin, and methyl-modified cyclodextrin And dextrins such as hydroxypropyl-modified cyclodextrin, water-soluble gums such as cationized guar gum, xanthan gum, cationized gum arabic and curdlan, sodium alginate and the like.
Of the above polysaccharides, cyclodextrins and modified cyclodextrins are desirable. As the cyclodextrin, any type of α, β, γ can be used.

  The polysaccharide improves the detergency of the detergent of the present invention, and cyclodextrin has a deodorizing effect in addition to the effect of improving the detergency.

  In addition to the above polysaccharides, for example, higher alcohol sulfate (Na salt or amine salt), alkyl allyl sulfonate (Na salt or amine salt), alkyl naphthalene sulfonate (Na salt or amine salt), Anionic surfactants such as alkyl naphthalene sulfonate condensates, alkyl phosphates, dialkyl sulphosuccinates, rosin soaps, fatty acid salts (Na salts or amine salts), polyoxyethylene alkyl ethers, polyoxyethylene alkyl phenol ethers, Polyoxyethylene alkyl ester, polyoxyethylene alkyl amine, polyoxyethylene alkylol amine, polyoxyethylene alkyl amide, sorbitan alkyl ester, polyoxyethylene sorbitan alkyl ester Nonionic surfactants such as octadecylamine acetate, imidazoline derivative acetate, polyalkylene polyamine derivatives or salts thereof, octadecyltrimethylammonium chloride, trimethylaminoethylalkylamide halide, alkylpyridinium sulfate, alkyltrimethylammonium halide, etc. Surfactants, colorants, fragrances, bactericides, fungicides, bleaches, chelating agents, enzymes, essential oils and the like may be added. In the case of adding the surfactant, the surfactant is usually added in an amount of 40 parts by mass or less with respect to 100 parts by mass of the polymer. It is added in an amount of 5 parts by mass or less, desirably 0.3 parts by mass or less, and more desirably 0.1 parts by mass or less. Moreover, the said additive may be added in mixture of 2 or more types.

  Furthermore, an inorganic salt may be added to the cleaning agent of the present invention. Examples of the inorganic salt include sulfates such as potassium sulfate, sodium sulfate and magnesium sulfate, hydrochlorides such as potassium chloride, sodium chloride, magnesium chloride and calcium chloride, and phosphates such as potassium phosphate and sodium phosphate. . The inorganic salt is usually added in an amount of 40 to 80 parts by mass with respect to 100 parts by mass of the polysaccharide of the present invention.

  Even if the inorganic salt is added, the cleaning power of the cleaning agent of the present invention is improved. A particularly desirable inorganic salt is sodium sulfate.

  Furthermore, an inorganic powder may be added to the cleaning agent of the present invention. Examples of the inorganic powder include bentonite, dicalite, zeolite, pearlite, talc, calcium carbonate, magnesium carbonate, barium sulfate, calcium sulfate, calcium sulfite, calcium phosphate, calcium hydroxide, magnesium hydroxide, aluminum hydroxide, magnesium oxide. , Titanium oxide, iron oxide, zinc oxide, alumina, silica, diatomaceous earth, dolomite, gypsum, clay, mica, carbon fiber, calcium silicate, white carbon, carbon black, iron powder, aluminum powder, stone powder, blast furnace slag, Examples include fly ash and zirconia powder. The inorganic powder is usually blended in an amount of 0.3 to 20 parts by mass with respect to 100 parts by mass of the polysaccharide of the present invention.

  Furthermore, enzymes such as proteolytic enzymes, starch-degrading enzymes, and oil-degrading enzymes may be added to the cleaning agent of the present invention. The amount of the enzyme added is usually that of the present invention. 1 part by mass or more is added to 100 parts by mass of the polysaccharide.

  The cleaning agent of the present invention is mainly provided as an aqueous solution. As a solvent, a water-soluble solvent other than water, such as methanol, ethanol, isopropanol, ethylene glycol, propylene glycol, glycerin, acetone, tetrahydrofuran, or a mixture of the solvent and water. A solvent may be used. The concentration of the polysaccharide in the aqueous solution is usually 5 to 50% by mass.

In use, the cleaning agent of the present invention is usually diluted with water to a concentration of about 100 to 150 ppm as the polysaccharide concentration. The cleaning agent of the present invention is preferably adjusted so that the polysaccharide concentration is pH 5 to 10, preferably 6 to 9, in a 120 ppm aqueous solution. If the pH is adjusted as described above, the pH is about 5 to 10 and desirably 6 to 9 even at the above-mentioned use concentration of 100 to 150 ppm, exhibits a preferable detergency, hardly corrosive, and has less foaming.
Examples for more specifically explaining the present invention will be described below.

(Preparation of cleaning solution)
Methyl-modified cyclodextrin (MeCD), hydroxypropyl-modified cyclodextrin (HPCD) and cationized guar gum (KGG) were each diluted to a polysaccharide concentration of 12% by mass with water, and further 4% by mass of sodium alkyl ether sulfate was added.

(Cleaning test)
Each of the above solutions prepared in Example 1 was diluted 1000 times with water (polysaccharide concentration of 120 ppm), and the pH of the diluted solution was variously adjusted with sodium hydroxide or citric acid to obtain a test washing solution.
Using a dishwasher smart I-50 type (product of Yokogawa Electronics Co., Ltd.), adjust the temperature of the test cleaning liquid to 60 ° C. and inject the contaminated material onto the surface to be cleaned for 40 seconds. Rinsing was performed by spraying water at 0 ° C. for 10 seconds, and the state of foaming, the degree of dirt removal, and the degree of corrosion of the object to be cleaned were evaluated visually.
Objects to be cleaned: Glass, lacquered bowl, urethane resin coated bowl Contaminants: mayonnaise, ketchup, salad oil Tables 1 to 3 show the results of cleaning tests.

As a comparative formulation, a cleaning liquid having the following composition was used.
Comparison 1
Potassium hydroxide 5% by mass
No. 2 diatom 10 〃
EDTA 10 〃
Comparison 2
Polyoxyethylene alkyl ether 5% by mass
EDTA 10 〃
Diethylene glycol monobutyl ether 5 〃

The evaluation of the test results was based on the following criteria.
-: Less ±: Some ＋: Yes ++: Significantly Detergency; ○: Almost removed □: Slightly left △: Substantially left ×: Mostly left corrosive; Decrease +: Lower surface gloss
++: Surface gloss is remarkably reduced ++: The surface is rough

  Looking at the results in Table 1, Table 2, and Table 3, foaming is likely to occur as the pH increases regardless of the type of the object to be cleaned. In Comparative 2 where the surfactant is the main component, foaming is remarkable. Further, the detergency is not sufficient at pH 5 or less, and oily contaminants such as mayonnaise and salad oil are likely to remain. Regarding the corrosivity, the corrosion becomes more significant as the pH increases regardless of the type of the object to be cleaned, but the corrosion becomes significant at pH 11. Comparative 1 has a pH of 11 and is highly corrosive.

(Preparation of cleaning solution)
The MeCD: HPCD 1: 1 mass ratio mixture, methylcellulose (MC) and xanthan gum (XG) were each diluted with water to a polysaccharide concentration of 9% by mass, and 4% by mass of sodium alkyl ether sulfate was further added. Each solution was adjusted to pH 9 with citric acid or sodium hydroxide.
As shown in Tables 4 to 6, bentonite, titanium oxide, zeolite, and sodium sulfate were blended in the polysaccharide solutions thus prepared to prepare Samples 1 to 12.

(Cleaning test)
The sample No. 1-12 solution prepared in Example 3 was diluted 1000 times with water, and the pH of the diluted solution was adjusted to 7 with sodium hydroxide to obtain a test cleaning solution. Went. In this example, glass was used as the object to be cleaned, and mayonnaise was selected as the contaminant.
The results of the cleaning test are shown in Table 7. Evaluation of the test results is the same as in Example 2.

  According to Table 7, it can be seen that no remarkable foaming was observed in each sample, the cleanability was sufficient, and there was little or no corrosivity.

The influence on the cleaning power of a detergent obtained by adding amylase (amylase) as an additive to an automatic dishwashing detergent mainly composed of MeCD shown in Table 8 was examined. The evaluation conditions are as follows.
Dirty ingredient: Rice grain Washed object: Ceramic dish Washing method: (1) Dissolve rice grain in hot water to make rice juice, and apply evenly to the surface of the dish (washed object) with a brush.
(2) Leave the dish with rice soup in a constant temperature bath at 40 ° C for 30 minutes to dry the surface.
(3) Using an automatic dishwasher, wash the dish with a 1000-fold diluted solution of the following ingredients.
Detergency evaluation: The stains on the dish surface before and after washing were colored by iodine-starch reaction and visually observed.
The evaluation results are shown in Table 8.

  According to Table 8, it can be seen that if 1 part by mass or more of amylase enzyme (starch degrading enzyme) is added to 100 parts by mass of MeCD, the enzyme addition effect becomes remarkable.

  The cleaning agent of the present invention is useful as a cleaning agent for an automatic dishwasher with little foaming and almost no corrosiveness to ceramics, glass, resin and the like.

Claims (6)

  A cleaning agent comprising a water-soluble polysaccharide and / or a water-soluble polysaccharide derivative.   The cleaning agent according to claim 1, wherein the water-soluble polysaccharide and / or the water-soluble polysaccharide derivative is a cyclodextrin and / or a cyclodextrin derivative.   A cleaning agent, wherein an inorganic salt is further added to the cleaning agent according to claim 1.   The cleaning agent according to claim 3, wherein the inorganic salt is sodium sulfate.   A cleaning agent, wherein an inorganic powder is further added to the cleaning agent according to claim 1.   A cleaning agent for an automatic dishwasher, wherein an enzyme is further added to the cleaning agent according to claim 1.