JPH0570799A - Detergent for washing machine bath - Google Patents

Abstract

PURPOSE:To provide a detergent for washing machine bath which can remove metal soaps formed from a fatty acid and a divalent or higher metal ion, which are responsible for black stains in washing machines, especially fully automatic washing machines and dish-washing machines. CONSTITUTION:A detergent for washing machine bath containing a chelating agent which is a salt of ethylenediaminetetraacetic acid or the like. Besides the chelating agent, the detergent may also contain a surfactant and/or a builder. The detergent for washing machine bath containing the chelating agent is diluted with water to a concentration of 0.1-50wt.% in terms of the chelating agent. By using the resulting water, the bath can be washed cleanly.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to soap dregs (metal soap) attached to the tank wall of washing machines such as washing machines and dishwashers.
The present invention relates to a cleaning agent used for the purpose of removing stains such as red and oil and mold generated from these. The detergent of the present invention can freely control its pH from weakly acidic to alkaline. In particular, the neutrality has advantages that the material of the washing machine is not damaged and the safety for human body and handling is improved.

[0002]

2. Description of the Related Art In recent years, a one-tank centrifugal dewatering washing machine has become widespread. However, when washing is carried out for a long period of time with a household compact clothing detergent, so-called compact detergent, with this one-tank type centrifugal dehydration washing machine, a problem peculiar to the compact detergent occurs. For example, since the detergent particles have a high density and are difficult to be dissolved in water, a part of the detergent particles becomes a gel and remains attached to the tub wall of the dehydration / washing tub or the water receiving tub. Or fatty acids and 2 in water
Water-insoluble metal soap (common name: known as:
Soap dregs) is produced, and this adheres to and remains on the tank wall as described above. Especially, the outer wall of the dehydration and washing tub and the inner wall of the water receiving tub are
Since it is not rubbed against laundry, the deposits tend to remain.

Further, the deposits adhered to the walls of these tanks may be moldy and rot to become black. This is called "black stain". This "black stain" sometimes spontaneously peels off from the tub wall and floats in the wash water to contaminate the laundry. As a cleaning agent for this "black stain", there is one containing percarbonate and orthosilicic acid (JP-A-3-1247).
No. 98). Also in the dishwasher, a water-insoluble gel-like substance is produced by the reaction between the detergent and the metal ions in the water or the reaction between the oil and fat in the dish and the metal ions, and adheres to the tank wall. However, the cleaning effect is still insufficient with such prior art compositions.

[0004]

DISCLOSURE OF THE INVENTION The object of the present invention is to dissolve water-insoluble gel which causes "black stain", metallic soap in which fatty acid and divalent or more valent metal ions are bound, human body fat, and dishwashing. It is also an object of the present invention to provide a cleaning agent for a cleaning machine tank, which can remove mold as well as organic substances such as metal soap in which fats and oils and metal ions are combined.

[0005]

The present invention provides a chelating agent,
Further, it relates to a cleaning agent for a cleaning machine tank, which optionally contains a surfactant and / or a builder.

Examples of chelating agents include metal salts or amine salts of ethylenediaminetetraacetic acid (EDTA), diethylenetriaminepentaacetic acid (DTPA), N-hydroxyethylethylenediaminetriacetic acid (HEDTA), triethylenetetraminehexaacetic acid (TTHA), and the like. Can be illustrated. As the metal salt, sodium salt, potassium salt,
An example is a lithium salt. Examples of amine salts include ammonia, monoethanolamine (MEA), diethanolamine (DEA), triethanolamine (TE).
A) etc. are mentioned. In particular, EDTA-MEA salt, ED
TA-DEA salt, EDTA-TEA salt, EDTA-Na
Salt and EDTA-K salt are preferable from the viewpoint of metal corrosiveness, safety and the like.

It is preferable that the detergent of the present invention contains a surfactant in addition to the chelating agent from the viewpoints of improving the permeability to the contaminants, the emulsifying property and the dispersibility and preventing the redeposition. As the surfactant, any of anionic, nonionic, cationic and amphoteric surfactants can be used. Examples of anionic surfactants include:

Alkylbenzene sulfonate, α-olefin sulfonate, paraffin sulfonate, α-olefin sulfate ester salt, higher alcohol sulfate ester salt, higher alcohol phosphate ester salt, dialkylsulfosuccinate ester salt, alkylnaphthalene sulfonate Examples thereof include salt.

Examples of nonionic surfactants include higher alcohol ethylene oxide adducts, alkylphenol ethylene oxide adducts, fatty acid ethylene oxide adducts, polyhydric alcohol fatty acid ester ethylene oxide adducts, higher alkylamine ethylene oxide adducts, Examples thereof include fatty acid amide ethylene oxide adducts and polypropylene glycol ethylene oxide adducts.

Examples of cationic surfactants include alkyl trimethyl ammonium salts, argyl dimethyl benzyl ammonium salts, pyridinium salts, alkyl amine salts and the like.

Examples of amphoteric surfactants include alkyl betaine salts and alkyl amino acid salts.

The detergent of the present invention contains a builder in addition to the chelating agent or the chelating agent and the surfactant to enhance the pH buffering property and the dispersibility of contaminants and prevent recontamination. Is preferred.

As the builder, both inorganic and organic builders can be used. Examples of the inorganic builder include sodium tripolyphosphate, sodium silicate, sodium orthosilicate, potassium pyrophosphate, sodium pyrophosphate, zeolite, soda ash, borax and sodium metakerate. Examples of the organic builder include sodium citrate and sodium polyacrylate.

When the detergent of the present invention contains a surfactant and / or a builder in addition to the chelating agent, 0.001 to 10 parts of the surfactant are added to 1 part by weight of the chelating agent.
It is suitable that the amount is 0 parts by weight, preferably 0.1 to 0.5 parts by weight, and the builder is 0.01 to 10 parts by weight, preferably 0.1 to 0.5 parts by weight, from the viewpoint of penetration force, dispersive power, rapid effect and the like. Is.

The cleaning agent of the present invention basically contains the above chelating agent as an essential component, and may further contain a surfactant and an inorganic or organic builder, and other optional components such as an enzyme, a solvent and a bactericide. Further, an oxidizing agent, a fragrance, a coloring agent and the like can be added appropriately.

Further, in the present invention, the above-mentioned detergent is mixed with water so that the concentration of the chelating agent is in the range of 0.1 to 50% by weight, preferably 1 to 20% by weight, and this mixture is placed in a washing machine tank. It is preferably used after being soaked for 1 to 24 hours.

[0017]

EXAMPLES Examples of the present invention will be specifically described below.
Cleaning agents having the compositions shown in Tables 1 to 3 were prepared, and their cleaning performance and corrosiveness were tested by the following methods.

Washing performance In a family of 3 people, a commercially available compact household detergent is used in a fully automatic washing machine, and after 1 year or more, the fully automatic washing machine is disassembled to remove the dehydration tub and the outer wall of the washing tub. The water-insoluble substance accumulated inside the water receiving tank is scraped off and dried under reduced pressure.

2 with constant speed (50 RPM) stirrer
Into an aluminum beaker containing 100 ml, 100 ml of the cleaning liquid of each Example kept at 20 ° C. is placed. Accurately put 5 g of the substance dried under reduced pressure therein, continue stirring for 30 minutes, filter through a glass filter (1G4), and dry under reduced pressure, and measure the weight accurately. ((5 g-weight of filter residue after washing) / 5 g) × 10
0 = Detergency (%)

Corrosion The weight of an aluminum plate of 20 × 50 × 1 mm is measured. Put 200 ml in a glass bottle and wash solution 100
Add 1 ml of aluminum plate weighed in it.
After being soaked in room temperature for 68 hours, rinsed with fresh water and dried, the weight of the aluminum plate is measured.

[0021]

Example 6 and Comparative Example 6 were used after being diluted 20 times with water. Others were used after being diluted 5 times with water.

[0023]

[Table 1]

[0024]

[Table 2]

[0025]

[Table 3]

[0026] (Note -1) dodecylbenzene sodium sulfonate (Note -2) polyoxyethylene nonylphenyl ether (EO ₁₀₎ (Note -3) lauryl dimethyl benzyl ammonium chloride (Note -4) 2-lauryl -N- carboxy Ethyl-N-
Hydroxyethyl imidazolinium betaine (Note-5), manufactured by Novo Industry Japan Co., Ltd., trade name "Esperase" (Note-6), manufactured by Novo Industry Japan Co., Ltd., trade name "Lipolase" (Note-7) Next 12% available chlorine in sodium chlorite

Claims (3)

[Claims] 1. A cleaning agent for a cleaning machine tank, which contains a chelating agent. 2. The cleaning agent for a cleaning machine tank according to claim 1, which contains a surfactant. 3. The cleaning agent for a cleaning machine tank according to claim 1, which contains a surfactant and a builder.