JP2915310B2 - Fin cleaning agent - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fin cleaning agent for a heat exchanger equipped with a plurality of fins used for heating and cooling a gas such as air.

[0002]

2. Description of the Related Art The fins of a heat exchanger used for heating and cooling a gas are washed with an acid or alkali, a surfactant,
A solvent or a cleaning agent that is a mixture thereof is sprayed on a fin using a sprayer such as a high-pressure pump or a hand spray, or as an aerosol.

[0003]

In the case of the conventional cleaning agent, the sprayed cleaning agent flows down from the fin surface in a short time, so that the cleaning liquid must be sprayed repeatedly to obtain a sufficient cleaning effect. Must use a large amount of cleaning agent, and collect a large amount of cleaning solution that has flowed down.
It was necessary to take measures to handle it. However, even if the cleaning liquid once sprayed has sufficient detergency, spraying it again may damage the sprayer due to the removed dirt, so it is almost always disposed of and the cleaning agent is used effectively. Had not been. In addition, since the cleaning agent is not thickened, the sprayed cleaning liquid scatters around in the form of water droplets and mist, and workers are constantly exposed to the danger of inhalation of water droplets and mist and the occurrence of obstacles due to adhesion to the body. It was necessary to wear heavy protective gear to protect the whole body. Even if the cleaning liquid is accidentally applied to the body during spraying work, it is difficult to determine whether or not the cleaning liquid has adhered to the naked eye, and it is difficult to determine the site of the application. was there.

[0004] In particular, recently, an air conditioner used for indoor air conditioning is often installed on a ceiling for the purpose of saving space. When cleaning the heat exchanger installed on the ceiling, move the equipment to keep the desks and other equipment under the air conditioner under cleaning clean, and place a waterproof sheet on it to collect the cleaning liquid that has dropped. It was necessary to perform extensive curing such as installing a collection container. Later, as a method of simplifying the curing, a method of attaching a hood to an air conditioner for cleaning, a method of spraying a cleaning liquid into a foam, and vacuuming the same were devised. However, in the case of a method of attaching a hood to an air conditioner, since the cleaning liquid once sprayed is not reused, the problem that the cleaning agent is not sufficiently used effectively has not been solved. In the case of conventional cleaning agents used for spraying and vacuuming the cleaning liquid in the form of foam, the cleaning liquid is sprayed from an aerosol can and foams at the same time. Did not reach, and bubbles disappeared in a few minutes, and the retention of bubbles between the fins was weak. Further, since the time for which the cleaning liquid is held between the fins is short, the problem that the cleaning liquid drops before the cleaning effect is sufficiently exhibited has not been sufficiently solved.

A method of spraying an aqueous solution of a cleaning agent or the like having increased viscosity to extend the contact time of an object to be cleaned or the like is disclosed in JP-A-63-190813, JP-A-2-10589.
5, JP-A-2-175800 and the like, and JP-A-5-112427 as a method of post-foaming are disclosed. However, these methods are not a method combining both the actions of thickening and post-foaming, and the fins are washed. It is not a method that can be used effectively. Fluorinated hydrocarbons are used as a method combining these two actions, but the method is different from the insoluble compressed gas of the present invention. However, when a cleaning liquid having a higher viscosity is simply used as a gas for aerosols, such as LPG, chlorofluorocarbon and dimethyl ether, foaming occurs immediately after being discharged from the aerosol can and the volume expands. There is a problem that it is difficult to penetrate between the fins, and even if it penetrates between the fins, it does not reach the inside of the fin. As described above, there are many problems, and the inconvenience was felt in cleaning the fins of the heat exchanger equipped with the fins.

[0006]

SUMMARY OF THE INVENTION The present invention solves such inconveniences, and the cleaning agent sprayed quickly reaches the interior of the fin to be cleaned and is held on the fin surface for a long time to clean. The cleaning agent is used effectively to prevent the use of excessive cleaning agents, and when cleaning the air conditioner installed on the ceiling, a curing operation is performed to prevent contamination around the air conditioner, and splashing by water droplets and mist is performed. The aim is to provide a fin cleaning agent that can improve the safety of workers by suppressing environmental pollution due to

[0007] A thickener for adjusting the viscosity is mixed with a surfactant for forming a foam, a pH adjuster for improving the washing effect, and a solvent, and the washing liquid having the increased viscosity is foamed into an aerosol for foaming. It is difficult to foam and the holding force between the fins is increased, so that the fin does not drip in a short time. Surfactants are cationic, anionic, nonionic and amphoteric water-soluble surfactants, pH adjusters are acids or alkalis, thickeners are sodium alginate, propylene glycol alginate, carboxymethyl cellulose ester, carboxy. Methylcellulose sodium, sodium starch glycolate, sodium starch phosphate, methylcellulose, sodium polyacrylate, cellulose ester, alginic acid, casein, guar gum, gluten, starch, etc. can be used. Material,
It is selected according to the stability of the dirt component and the liquid and is not particularly limited, but cellulose ester is suitable for stability and dispersibility in an alkaline solution.

If the viscosity of the cleaning liquid is too low, the stability of the foam deteriorates and the dripping and dripping occur quickly.
It is desirable not to fall below. If the viscosity is too high,
In the case of using an aerosol, the discharge performance deteriorates, and the cleaning liquid reaches a short distance in a container with a single chamber structure, so that the gas for injection must be filled in another chamber, or another injection device such as a compressor must be used. The structure should not exceed 1000 CPS, more preferably should not exceed 300 CPS, because the structure becomes complicated or the cost increases. Accordingly, the viscosity is adjusted to 5 to 1000 CPS, more preferably 5 to 300 CPS. Thus, the viscosity is 5-1
000 CPS, more preferably 5 to 300 CPS.
A mixture of a low-boiling compound at 40 ° C. is discharged using nitrogen gas as an insoluble compressed gas.

[0009]

The low-boiling point compound such as isopentane and normal pentane having a boiling point of 10 to 40 ° C. is mixed with the cleaning solution having the viscosity adjusted to 5 to 1000 CPS, more preferably 5 to 300 CPS, and HCFC-22 and HCFC are used as foaming assistants.
-123, HCFC-124, HCFC-142b, H
An alternative to FC-125, HFC-134a and HFC-152a is LPG composed of chlorofluorocarbon or butane (10 to 100%) or propane (0 to 90%) or a mixture of less than 4% of dimethyl ether as nitrogen insoluble compressed gas. When discharged using a gas, the liquid becomes liquid immediately after discharge, easily penetrates between the fins, foams after reaching the depths of the fins, and expands due to foaming. The cleaning was carried out for a long time, and the cleaning agent was sufficiently used to solve the problem.

[0010]

Embodiments of the present invention will be described below. (Example 1) An Example No. consisting of the components shown in Table 1. 1.
No. 2. No. Comparative product (conventional product) No. 3 comprising three kinds of cleaning agents of No. 3 and the components shown in Table 2. No. 1. Table 3 shows the results of evaluation of the foam disappearance time, the drooling property, the foam falling speed, and the cleaning liquid reaching distance using the two types of cleaning agents. The evaluation method was as follows. (1) Foam disappearance time A 100-ml glass beaker is sprayed to measure the time until the foam disappears. The disappearance of the bubbles was determined when a liquid surface without bubbles appeared in the center of the beaker. (2) Bubble dripping The jet is sprayed onto the front surface of the lower end of the fin of the heat exchanger equipped with fins of the air conditioner, and the time required for the cleaning liquid or its foam to fall from the heat exchanger is measured. (3) Foam falling speed Foam formed by spraying on a vertical metal surface for 2 seconds,
The time to fall 0 cm is measured. (4) Arrival time of cleaning liquid Measure the distance that the cleaning liquid is injected into the front surface of the lower end of the fin of the fin-mounted heat exchanger of the air conditioner with a depth of 7 cm and the cleaning liquid enters from the front of the fin.

[0011]

[Table 1]

[0012]

[Table 2]

[0013]

[Table 3]

(Embodiment 2) The product No. of the embodiment 1 No. 2 and comparative product No. 2 Table 4 shows the results of a cleaning test of a fin-attached heat exchanger of a comparative product in which only the thickening of No. 1 was performed. The fin-mounted heat exchanger used for cooling is often wet on the fin surface due to condensed water. Therefore, in the case of this embodiment, comparison was made between the dry state and the wet state. The state of the foam was evaluated as follows: ：: Remains on the whole, ○: 50 on the surface
%, But almost the inside remains. △: 50 on the inside, not on the surface
%: ▲: Slightly residual, ×: Complete disappearance of bubbles.

[0015]

[Table 4]

As is clear from the results in Tables 3 and 4,
This product shows good results in comparison with the comparative product.Furthermore, the foam formed on the front and lower parts of the fin shows the behavior of being drawn into the fin together with the disappearance of the foam. Good results were obtained, such as falling in the form of a lump of water, while the product of the present invention was only dropped by water drops.

(Example 3) Artificial dirt specified in JIS K 3362 was sprayed on a fin-mounted heat exchanger, and
After standing for a week, the product No. Inject 2
As a result of vacuuming after 15 minutes, the artificial soil adhering to the fin-mounted heat exchanger was sufficiently removed together with the formed foam, and no foam remained.

(Embodiment 4) As in Embodiment 3, JIS K
The artificial soil specified in 3362 is sprayed on the heat exchanger equipped with fins and left for one week.
o. As a result of spraying No. 2 and washing with water after 15 minutes, as in Example 3, the artificial soil adhering to the fin-mounted heat exchanger was sufficiently removed together with the formed foam, and no foam remained.

[0019]

As described above, the present invention relates to the cleaning of a heat exchanger with a gas such as air provided with fins, the workability thereof, the prevention of environmental pollution, the safety of workers, the cleaning effect, and the use of cleaning chemicals. This invention has many features, such as providing a great advantage in preventing waste, and is extremely excellent for industrial use.

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁶ Identification code FI C09K 3/30 C09K 3/30 H (72) Inventor Hideo Suzuki 6-1, Nakagawahoncho, Minato-ku, Nagoya-shi, Aichi Nagoya Aerosol Industries (56) References JP-A-5-112427 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) C11D 17/08 C11D 3/16-3/24 F28G 9 / 00 C09K 3/30 WPI / L (QUESTEL)

Claims (3)

(57) [Claims] An aqueous solution containing a surfactant has a viscosity of 5%.
If it is less than CPS, a thickener is added to increase the viscosity to 5-1000.
Isopentane CPS (20 ° C.) to adjust the washing liquid (20-80%), by adding low-boiling compounds normal pentane, etc. 10 to 40 ° C. The (5-50%), the discharge linear
After that, it becomes liquid and after reaching the depth of the heat exchanger fins
Fin detergents with to the foaming type, is longer duration of the formed bubbles, characterized in that was long time until dripping or dropping of bubbles occurs after foaming. 2. A single-chamber aerosol container filled with HCFC-22, HCFC-123 and HCFC as foaming aids.
-124, HCFC-142b, HFC-125, HF
2. An insoluble compressed gas as a propellant, wherein LPG or dimethyl ether composed of CFC-134a, HFC-152a substitute for chlorofluorocarbon or butane (10 to 100%), and propane (0 to 90%) is added. Fin cleaner. 3. An alkaline agent selected from caustic soda, caustic potash, phosphate and silicate is added to adjust the pH to 4.0 to 1.
2. The fin cleaning composition according to claim 1, wherein the fin cleaning composition has a cleaning effect of 4.0.