TWI486439B - Detergent composition and cleaning method - Google Patents

Description

Detergent composition and washing method

The present invention relates to a detergent composition for cleaning aluminum blades used in a heat exchanger for an air conditioner, and a cleaning method.

In an air-conditioning indoor unit, an aluminum blade for a heat exchanger is generally assembled.

When the indoor air passes through the aluminum blade, dust and soot in the room that has not been completely removed by the filter in the previous stage adhere to the surface of the aluminum blade.

Further, when the cold room is operated, since the surface of the aluminum blade is likely to be in a dew condensation state, mold is easily generated.

When these unsatisfactory conditions are ignored and continue to be used, not only the air-conditioning capability is lowered but also the cause of malodor is caused.

A method of washing dust and soot attached to an aluminum blade is currently available in various neutral or alkaline detergents.

Neutral lotion does not cause damage to aluminum blades, but its detergency is weak.

Alkaline lotions have a strong detergency, but may cause corrosion of aluminum blades due to high pH.

Among the alkaline detergents, there are detergents using alkaline electrolyzed water.

The alkaline electrolyzed water is alkaline water which is formed by decomposing water by electric current, and the electrolyte can be used to form electrolyzed water using salt, baking soda, potassium carbonate or the like.

Further, the alkaline electrolyzed water is produced by alkaline electrolyzed water of various pHs by the electrolysis strength of the electrolyzer produced.

The alkaline electrolyzed water of pH 9 to 10 is called alkaline ionized water, and is used as drinking electrolyzed water. However, the washing of the aluminum blade to which the dirt has adhered has not yet reached a state of sufficient detergency.

On the other hand, the alkaline electrolyzed water having a pH of 10 or more has a strong detergency, and the alkaline electrolyzed water having a high pH has both a detergency and a deodorizing power.

The alkaline electrolyzed water having a pH of 10 or more has a strong deodorizing effect on hydrogen sulfide in sulfur-based malodor, but has a weak deodorizing effect on mercaptans.

For deodorants of thiols, the following patent applications exist.

[Patent Document 1] JP-A-2005-118230

The feature in Patent Document 1 is to add an alkaline aqueous solution to a mixed solution of the juice and water of the persimmon.

In the examples of Patent Document 1, the effect on hydrogen sulfide and methyl mercaptan can be obtained.

Patent Document 1 describes a mixed solution of juice and water of persimmon The range of the hydrogen ion index pH after the addition of the alkaline aqueous solution is described, and it is described that the pH system is expected to be pH 8.5 to 9.0, and when the pH is higher than 9.0, the reducing power is further lost and the deodorizing power is lowered.

However, when the aluminum blade is washed with alkaline electrolyzed water, pH 10 or more is a necessary condition, and when pH 9 or less is added, even if the deodorizing effect is obtained by the addition of the persimmon juice, there is a problem that the detergency is insufficient.

In the present invention, alkaline electrolyzed water having a pH of 10 or more, which is a cleaning agent, is used as an essential component, and is characterized in that it contains a citrate for preventing corrosion of aluminum leaves, and a persimmon juice as a deodorizing aid. .

Further, the above-mentioned detergent composition may be directly or filled in a gas gel tank, and then sprayed as an air-gel spray on an aluminum blade of a heat exchanger for an air conditioner.

By spraying the detergent composition of the present invention on an aluminum blade of an air conditioner indoor unit, dust, soot, and the like can be washed without causing damage to the aluminum.

Further, the alkaline electrolyzed water having a pH of 10 or more has a deodorizing effect of deodorizing hydrogen sulfide or the like, and the deodorizing effect of the detergent composition of the present invention is not completely caused by the juice of the persimmon, even if the original persimmon is squeezed. In the range of pH 9.0 or higher in which the effect is lowered, the deodorizing effect of the alkaline electrolyzed water complements the deodorizing effect of the persimmon juice, and the deodorizing effect is exerted, and the malodor generated by the air conditioner such as deodorizing mold odor can be exhibited.

The detergent composition according to the present invention is composed of a washing component containing pH 10 or higher of alkaline electrolyzed water, citrate or persimmon tannin.

In the present invention, alkaline electrolyzed water is used as a main component, and alkaline electrolyzed water is alkaline water which is formed by decomposing water by electric current. The electrolyte can be used to form electrolyzed water using salt, baking soda, potassium carbonate or the like.

The alkaline electrolyzed water has a pH of 10 or more and exhibits excellent detergency against dirt adhering to aluminum blades.

The pH of the alkaline electrolyzed water is more desirably pH 11 to 13, and the high pH is preferable for the removal of dirt such as dust and oil smoke.

The bismuth salt is a water-soluble phthalate which is adjusted to prevent the corrosion of aluminum and the pH of the detergent.

Persimmon tannin is a component contained in the juice of persimmon, and the commercial product is Pancil (RIRISU Science Industry).

The appropriate amount of the component to complement the deodorizing effect of the alkaline electrolyzed water can be adjusted in accordance with the purpose of deodorization.

Further, in order to further improve the detergency, a surfactant may be added.

[Examples]

According to the composition ratio shown in Table 1 of the examples, various detergent compositions were adjusted, and then filled with a DME in a gas gelatin tank to prepare a gas gel spray as a detergent.

The following tests were carried out for these.

Washing test

An aluminum blade that has not been washed out is taken out as an object to be cleaned from an air-conditioning indoor unit that has been used for a long time in the home.

The detergent was sprayed on the object to be washed, and the appearance of the detergent was judged from the appearance after washing.

Removed dirt after washing ‧‧‧‧‧○

State of residual dirt after washing ‧‧‧‧‧×

Further, after the washing, the washing liquid was recovered, and the washing property of the washing liquid was judged from the dirt of the recovered liquid.

The recovered liquid is colored due to dirt ‧‧‧‧‧○

The recovered liquid is uncolored due to the absence of dirt. ‧‧‧‧‧×

The amount of spray is matched with the actual use, and each air conditioner uses 1 bottle of gas glue (content amount is 420mL).

2. Corrosion to aluminum

The aluminum plate was immersed in various detergent compositions shown in Table 1, and after 24 hours, the appearance change was examined.

No change after 24 hours and before immersion ‧‧‧‧‧○

Corrosion status found after 24 hours ‧‧‧‧‧×

3. Deodorization test

2 mL of various detergent compositions shown in Table 1 were placed in a 5 L air sampling bag.

Then, the air 3L containing the malodorous component was filled, and it was made 2 hours later. The concentration of the malodorous component was measured using a gas detecting tube.

Malodorous component 1. Hydrogen sulfide Initial gas concentration 18ppm

2. Methyl mercaptan initial gas concentration 8ppm

A blank test was also carried out, and the deodorization rate obtained by calculation was shown in Table 1.

The various detergent compositions were adjusted in the proportions of the components shown in Table 1 as a comparative example, and the same gas spray spray as in the examples was prepared, and the same test as in the examples was carried out, and the results are shown in Table 1.

[Industrial availability]

The detergent composition of the present invention has a cleaning effect on the dirt component of the aluminum blade attached to the air conditioner indoor unit, and a deodorizing effect on the malodor generated from the dirt component, by directly or filling in the gas canister. Sprayed on aluminum blades, it can prevent the odor of air conditioners when moving, which can prevent the ability of cold room and the ability of greenhouse.

Claims (4)

A detergent composition characterized by containing alkaline electrolyzed water having a pH of 10 or more, citrate, and pressed juice of persimmon. The detergent composition of claim 1, wherein the juice of the persimmon is persimmon tannin. The detergent composition according to claim 1 or 2, wherein the detergent is a detergent for an air conditioner. A cleaning method for cleaning an air conditioner by using the detergent composition according to any one of claims 1 to 3.