JPS5943518B2 - Neutral toilet cleaner composition - Google Patents

Description

[Detailed Description of the Invention] In recent years, the popularity of flush toilets in Japan has been making remarkable progress.

Particularly when installing a septic tank for home use, where the waste is decomposed by bacteria and disposed of into the sewer, normal commercially available strong acidic toilet cleaners (5-10% hydrochloric acid solution) have the disadvantage of killing bacteria, so they should not be used. Can not do it. This fact has already been clarified by various studies and publications. For this reason, households with household septic tanks can only use toilet cleaners with a neutral pH value. For this reason, neutral toilet cleaners have weak cleaning power, so the neutral toilet cleaners currently on the market use a method in which an abrasive is added to a surfactant and the abrasive power is used to scrub away dirt. However, scrubbing the inside of the toilet bowl with a scrubbing brush or brush is not necessarily a preferable cleaning method, and the use of abrasives is also not a preferable method in terms of damage and abrasion to the top coat of the toilet bowl. As a result of intensive research to develop a cleaning agent that does not have these various problems and can also be used in toilets equipped with household septic tanks, the inventors of the present invention have discovered that cleaning agents can be used in toilets even though the pH value is neutral. We have discovered a component that chemically decomposes contaminants (e.g., calcium urate) and does not cause any damage to toilet bowl top coats and drainage equipment, and has developed a neutral toilet cleaning composition of the present invention. The development was successful. All of the alkali salts of aminopolycarboxylic acids represented by nitrilotriacetic acid, ethylenediaminetetraacetic acid, diethylenetriaminepentaacetic acid, and hydroxyethylenediaminetriacetic acid that constitute the cleaning composition of the present invention have strong chelating ability, and they cause contamination in the toilet bowl. It is known that calcium urate can be chelated and decomposed.

As an example, Table 1 shows chelates of various aminopolycarboxylic acid alkali salts (e.g., soda salts) and polyphosphoric acid soda salts.

The following is abbreviated as above.

However, if alkaline salts are used incorrectly, the pH value will rise, causing the bacteria in the septic tank to die.

The organic amine salt and ammonium salt of the aminopolycarboxylic acid of the present invention have a pH value of 11 or more based on the neutralization equivalent of the aminopolycarboxylic acid because commonly used soda salts and potassium salts are strong alkaline agents. In contrast, it is generated neutrally.

Table 2 shows the PH values for various alkali salts of aminopolycarboxylic acids.

The following is abbreviated as above.

Furthermore, sodium salts and potassium salts of aminopolycarboxylic acids cause more corrosion of toilet bowl topcoats than amine salts and ammonium salts of aminopolycarboxylic acids.

Table 3 shows the results of corrosion tests on ceramics (ceramic toilet bowls) for various alkali salts of various aminopolycarboxylic acids.

Test ceramics: Manufactured by Ina Seito Co., Ltd., Ina Sanitary Ware Test 1 Test solution (concentration): Various alkali salt aqueous solutions of various aminopolycarboxylic acids (5% as aminopolycarboxylic acid) Test temperature and immersion time: Sanyo Electric Co., Ltd. Using incubator manufactured by Co., Ltd. (Test temperature: 45℃) (Immersion time: 24, 48, 7
2, 96, 120 hours) Test method: 200 cc of the test solution was placed in a 300 cc plastic container with a closed lid, and the test ceramic was immersed in it, and the test ceramic was pulled out at each time interval to determine the state of corrosion.

Corrosion determination method for test ceramics: Ceramic surface ← Pencil (with constant force)
HB), and judge by the density of the pencil on the surface of the ceramic.

That is, when the surface of the topcoat is corroded, the pencil can draw thickly, and when no corrosion occurs, the pencil only sticks lightly to the surface of the topcoat. Judgment evaluation: The biggest drawback of Risalt is that a gel-like insoluble precipitate is formed after chelate decomposition of calcium urate, which is a contaminant in the toilet bowl, whereas the amine salt and ammonium salt of the aminopolycarboxylic acid of the present invention uric acid amine salts and ammonium uric acid that produce little or no gel-like insoluble precipitates, do not corrode toilet bowl topcoats, and free amines and ammonia are easily dissolved in water after chelate decomposition. Salts form and can be quickly removed.

Table 4 shows the experimental results of the water solubility after chelate decomposition of calcium urate with various alkali salts of aminopolycarboxylic acids.

The condition is shown when an alkali salt of aminopolycarboxylic acid (an amount three times the theoretical value for chelate decomposition of urea calcium as an aminocarboxylic acid) is used in a 0.5% calcium urate dispersion.

The organic amine salts or ammonium salts of aminopolycarboxylic acids represented by nitrilotriacetic acid, ethylenediaminetetraacetic acid, diethylenetriaminepentaacetic acid, and hydroxyethylenediaminetriacetic acid in this composition have excellent removal properties for toilet bowl contaminants (calcium urate). However, in consideration of chelating power, price, etc., it is preferable to use ethylenediaminetetraacetic acid monoethanolamine salt or ethylenediaminetetraacetic acid triethanolamine salt.

Furthermore, the surfactant in the present composition has a penetrating, emulsifying, and dispersing effect on contaminants in the toilet bowl, and exhibits excellent effectiveness in rapid removal of contaminants and recontamination during cleaning.

In addition, all kinds of surfactants such as anionic, nonionic, cationic, and amphoteric surfactants can be used as the surfactant in this composition, but it is preferable to use surfactants with excellent biodegradability. preferable.

Furthermore, the content of organic amine salts or ammonium salts of aminopolycarboxylic acids represented by nitrilotriacetic acid, ethylenediaminetetraacetic acid, diethylenetriaminepentaacetic acid, and hydroethylenediaminetriacetic acid in this composition is 0.5 to 60% by weight? , preferably 2 to 40 weight? and the surfactant is used within the range of 0.05 to 20% by weight, preferably 0.1 to 5% by weight. Furthermore, in addition to the above-mentioned components, the cleaning power of the cleaning composition of the present invention can be synergistically enhanced by containing the following components as required.

1. Solvent (e.g. low odor, low toxicity glycol, alcohol, petroleum solvent) 2. Enzymes (protein-degrading enzymes, etc.) 3. Bleach (oxidizing and reducing bleach) 4. Rust preventive agent (rust preventive agent for drain pipes made of iron, copper, etc.) Also, when cleaning the vertical part of a toilet bowl, by solidifying or thickening this composition, the wetting time of the surface of the toilet bowl can be prolonged. It is also possible to increase the cleaning effect.

Table 5 below shows the external appearance and cleaning performance evaluation of the example and control Shioto cleaning agents.

Although the cleaning composition of the present invention is neutral, it has excellent toilet cleaning power without using any abrasives, and does not damage the topcoat of the toilet bowl.

Claims (1)

[Claims] 1 Nitrilotriacetic acid, ethylenediaminetetraacetic acid,
0.5 to 60% by weight of an organic amine salt or ammonium salt of at least one aminopolycarboxylic acid selected from the group consisting of diethylenetriaminepentaacetic acid and hydroxyethylenediaminetriacetic acid, and 0.05 to 20% by weight of a surfactant.
% by weight and, if necessary, one or more of enzymes, bleaches, solvents, and rust preventives.