JPS58191800A - Detergent highly swellable by gas generation - 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] Normally, when cleaning an object with a complicated structure, the object is often disassembled into individual parts or immersed as is in a cleaning tank. In some cases, conventional cleaning methods require many steps, or are inconvenient because they cannot fit into the cleaning tank due to their shape.

For example, in the case of an air-cooled cooler, dust particles in the air adhere to the fin coil part, which is the heat dissipation part of the Freon gas, reducing the efficiency of heat exchange and causing waste and failure. Become.

Conventionally, in order to clean such a fin coil, it is necessary to remove it and clean it, or to clean the surface to be cleaned from the nozzle.
The method used is to squirt it out and clean it.

However, since the fin coil has fin-shaped aluminum plates arranged with few gaps in order to efficiently dissipate heat to the outside of the pipe, it is difficult to clean the small parts, especially the back side, with this cleaning method.

According to the cleaning method of the present invention, after the cleaning agent adheres to the fin coil, it continues to emit air, and its expansion rate is 5 to 10.
Since the cleaning agent is delivered to every part of the fin coil, more complete cleaning is possible.

The peroxide used in the present invention has an appropriate concentration of 5 to 40% aqueous solution, and is used as a stabilizer for long-term storage.
It is advisable to add ~1.0% sodium birophosphate.

Further, the concentration is preferably such that the solubility decreases and crystals do not precipitate during storage at low temperatures.

These peroxides can be used alone or as a mixture, but it is not preferable to mix them with other foreign substances that promote decomposition.

Since each chemical substance that decomposes peroxide has its own characteristics, it can be used properly. First, the most suitable manganese salt is potassium permanate, which is added at a concentration of 0.5 to 3% to peroxide. has the highest decomposition power among other inorganic substances in appropriate amounts. The use of 1 to 5% ferric chloride as the iron salt is extremely economical, and the use of sulfuric acid as the copper salt results in a cleaning solution with less color than other salts. That is,
In addition to being undesirable, the coloration of heavy metal salts remains after cleaning.
Secondary pollution.

It may cause.

A typical enzyme among enzymes is catalase, which exerts the desired decomposition power in a smaller amount than other substances, and is capable of reducing peroxide jffl.
It is effective at 0.005 to 0.5% of hi, and in this case, compounds such as ammonia, l-hydrazine, ethylenediamine, etc., which can be used even if the enzyme purity is poor, and water dissolution are 6 to 3%.
It is effective at 0%, and has a cleaning effect as shown in the example of the present invention.For example, if ammonia water is used, dirt on the fin coil will be well cleaned, and no washing residue will remain after rinsing with water. It has the feature of not corroding the aluminum material.

Surfactants are essential materials. A surfactant is added that plays the role of creating a fine, long-lasting layer of wrinkles created by oxygen gas generated from the decomposition of hydrogen peroxide, etc., or nitrogen gas generated by the reaction of hydrazine. This increases the cleaning effect, and since the fine bubbles persist, the viscosity of the cleaning agent increases, and it has the effect of being swamped at the surface of the object to be cleaned, rather than being washed away.

For items to be cleaned that are contaminated with airborne contaminants, such as the case of fin coils, alkaline cleaning is recommended. When carbon dioxide gas is used as gas dissipation for an expansive cleaning agent, it must be an acidic cleaning agent.This is an application of the principle of decomposing carbonates with acid, and the cleaning agent acidified by that acid is called an alkaline cleaning agent. Its cleaning power is inferior to that of

Caustic soda, soda carbonate, sodium phosphate, sodium silicate, ammonia, hydrazine, and ethylenediamine are used as alkaline auxiliaries for the purpose of enhancing cleaning power.

As surfactants that increase the persistence of foxtail and have the main cleaning power, oleaginous acid soaps, alkylaryl sulfonates, nonylphenol ethylene oxides, and polyethylene glycol ethers are particularly effective, but other synthetic detergents are also effective. There are many things that are effective.

The mechanism of gas generation by decomposition of peroxide, which is the principle of high expansion in the cleaning agent of the present invention, is as known in the art. For example, in the case of hydrogen peroxide, it is decomposed into water molecules and oxygen molecules. This generates oxygen gas.

In this case, if ammonium or the like is present, it may cause complicated reactions such as generating nitrogen gas.

As described above, as a method for cleaning objects with difficult-to-clean structures, the cleaning agent is violently released into gas, increasing its volume by approximately seven times, thereby removing the details of the object. This method enables cleaning by pumping cleaning agent up to 100% of the pH level, and is effective at any pH value.

Example 1 100 parts of an aqueous solution containing 5% caustic soda, 1.5% sodium alkylbenzene sulfonate, and 5% ammonia,
Add 30 parts of 15% sodium percarbonate to this and mix for about 5 seconds.

When the volume of cleaning water increases by about 1.5 times, spray it on the fin coil dirt of the air-cooled air conditioner.

After the cleaning agent expands and spreads over the entire fin coil, leave it for a few minutes and rinse with water (Φ).

The fin coil can be easily cleaned by the above method.

Example 2 Metasilicate pentahydrate 3%, sodium tripolyphosphate 1
．． Immediately after spraying 100 parts of a 1% aqueous solution of 5%-nonylphenol polyoxyethylene (10 mol) ether onto the fin coil dirt of an air-cooled air conditioner using an electric sprayer,
Sprinkle 50 parts of % hydrogen peroxide solution in the same manner.

The cleaning agent spreads throughout the area, and after a few minutes, the cleaning process is completed by rinsing with water.

Claims (1)

[Claims] Peroxide is used as a gas supply to emit and expand the cleaning agent, a chemical substance to decompose it, and a surfactant and assistants to stably and sustain the eruption. It is a cleaning agent that can be mixed with a cleaning agent at the time of use, and the expansion of the cleaning agent due to fumes can give a cleaning effect to the details of the object to be cleaned.In the above, the peroxides include hydrogen peroxide and percarbonate. Soda 1, sodium percarbonate, sodium perphosphate, etc. and their aqueous solutions are used, and the chemical substances used to decompose them are manganese salts, iron salts, copper salts, ammonia, hydrazine, ethylene diamine, peroxide decomposing enzymes, and the like. An aqueous solution, alkaline salts such as caustic soda, sodium silicate, and soda carbonate are used as auxiliaries, and fatty acid soap and synthetic detergent are used as surfactants.