JPS59164398A - Water tank detergent - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an aquarium cleaning agent for removing stains mainly composed of iron oxide and divalent metal carbonates adhering to the wall surface of an elevated aquarium or an underground aquarium.

Currently, in buildings with a floor surface of fJ43,000 m' or more, elevated water tanks and underground water tanks must be cleaned every 91 years according to the law.
Wall surfaces (removal of adhered dirt) are required. The main components of adhered dirt are scales mainly composed of iron oxide, iron hydroxide, and carbonates of divalent metals, as well as clay minerals and slime. Cleaning methods have been carried out using detergent-based or surfactant-based detergents.

However, inorganic acid-based cleaning agents tend to cause corrosion of the aquarium wall surface and have problems in cleaning operations, such as a strong irritating odor. Furthermore, if these strong acids remained in water tanks, etc., there were serious problems such as corrosion of metal piping and problems in making them available for drinking.

Surfactant-based cleaning agents have not been able to sufficiently remove scales such as iron oxide, iron hydroxide, and carbonates of divalent metals.

The purpose of the present invention is to solve the above problems and provide a cleaning agent that can easily remove dirt adhering to the walls of elevated water tanks or underground water tanks, and that does not cause any safety surface pressure on crop surfaces or human bodies. It's there to provide.

As a result of intensive research, the present inventors have discovered that the above object can be achieved by using an organic acid that is approved as a food additive, leading to the present invention.

That is, the cleaning agent of the present invention is selected from the group consisting of oxalic acid, lactic acid, tartaric acid, citric acid, gluconic acid, ascorbic acid, and malic acid. It is characterized by containing the above organic acids as active ingredients.

Among the above organic acids, aqueous solutions of oxalic acid, citric acid, and malic acid can be used to form iron oxides, iron hydroxides, and carbonates of divalent metals.
Each exhibits good dissolving power on its own. However, since oxalic acid may precipitate salts with low solubility such as iron oxalate and calcium oxalate, and citric acid may precipitate salts with low solubility such as iron citrate, a sufficient cleaning effect cannot necessarily be obtained.

Therefore, by using a mixed acid system of two types, such as oxalic acid and citric acid, or citric acid and ascorbic acid, or three types, such as oxalic acid, citric acid, and malic acid, a strong mutual effect is expressed, and the above-mentioned results are obtained. Excellent cleaning effect can be obtained without precipitation of salt.

As a method for cleaning an aquarium wall surface using the cleaning agent of the present invention, a coating cleaning method is superior in order to use the cleaning agent economically and effectively.

That is, a solution containing an organic acid dissolved at a concentration of 1% or more, preferably 3% or more is used as a cleaning agent, and this is applied to dirty areas on the walls of an elevated water tank or an underground water tank with a sponge, brush, spray, etc., and iron oxide, iron oxide, etc. Dissolve iron hydroxide and carbonates of divalent metals.

In order to enhance the coating effect, it is better to mix 0.1 to 5% of a thickener such as methyl cellulose or gar gum. If the dirt is stubborn, you can dissolve it in a short time by rubbing it off with a sponge before the coated surface dries.

After dissolving the deposits, thoroughly wash the wall surface with high-pressure spray water, etc., and completely drain the cleaning waste liquid out of the water tank to avoid problems such as cleaning agent and dirt remaining in the water supply piping. do not have.

Hereinafter, the effectiveness of the present invention will be clarified through experimental examples and examples.

Experimental Example The deposits were collected from the wall of an underground water tank that had been used for many years and were dissolved using the organic acids shown in the table below, and the amounts of eluted iron ions and calcium ions were measured.

The method is as follows: First, take 500ynl of a drug solution with a predetermined concentration in a 500d ruby carnimate, and prepare a scale sample (composition: F
10 g of e20B 58%, CaC 0.17%) was added and dissolved at a liquid temperature of 20° C. for 4 hours with stirring, and the amount of eluted iron ions and calcium ions were measured by atomic absorption spectrometry.

The results are shown in the table below, and the effectiveness of the present invention can be understood.

(Leaving space below) Example In an elevated water tank (holding water! 10 m') in an apartment building, cleaning was carried out using a mixture of 5% oxalic acid and 5% citric acid in 1:2 solution using the coating and cleaning method described above. Before cleaning, the wall surface had a reddish-brown color due to adhesion of scale mainly composed of iron oxide and iron hydroxide, but by using the above mixture, the wall surface became clean and the deposits could be sufficiently removed.

On the other hand, cleaning was carried out by washing with water in an elevated water tank in a separate condo building (water capacity: 5-), but the walls remained reddish-brown even after cleaning, and no removal effect was observed.

Patent applicant Kurita Industries Co., Ltd. 723-

Claims (1)

[Claims] 1. Cleaning of an elevated or underground water tank characterized by containing as an active ingredient two or more organic acids selected from the group consisting of oxalic acid, lactic acid, tartaric acid, citric acid, gluconic acid, ascorbic acid, and malic acid. agent.