JP2987757B2 - High pressure hot water peeling method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention mainly relates to the removal of old coating films on architectural structures or the like, or the formation of fine irregularities on the underlayer in order to improve the adhesion of paint when painting. The present invention relates to a high-pressure hot water peeling method used for roughening work.

[0002]

2. Description of the Related Art Conventionally, for example, when a coating layer on an outer wall surface of a building structure is stained, cracked, or peeled off an old coating layer, or when rust generated on an outer wall surface is dropped, or Dry sand blasting method and wet blasting method, in which the blast material is sprayed onto the coating surface together with compressed air or high-pressure water during roughing work, where fine irregularities are added to the base in order to increase the bonding strength in the pre-coating process. Construction methods are being implemented.

[0003] Other methods include a disk sander in which a disk is attached to a motor shaft and a cutter or a cloth file is attached to the disk, a release agent method in which a release agent containing an organic solvent is applied, and a release agent method of 1000 to 2000 kgf. There is also a method using an ultra-high pressure water method in which water is sprayed at a pressure of / cm ² .

[0004]

However, in the case of the dry sand blasting method, silica sand radiated by being mixed with the compressed air hits the surface to be treated, generating dust, and the dust is scattered. In addition to the problem of worsening and deteriorating the worker's health, silica sand that has hit the surface to be treated may still remain and adhere to it. In some cases, however, this method absorbs and collects the blast material sent by the compressed air pressure at the same time as the discharge, so that the generation of dust and the like is small, but the working efficiency is poor. In addition, the silica sand that has fallen on the surface to be treated must be swept away, absorbed by vacuum, washed with water, etc., and the silica sand washed away by water must be collected from the meeting place. However, a lot of trouble and time had to be spent on this collection.

In the case of the wet blasting method, the blast material is radiated to the surface to be treated together with the high-pressure water. Therefore, although the generation of dust is small, it is necessary to collect and treat the blast material containing the radiated and dropped water. There is a problem that a processing facility for the secondary processing is required, the processing cost is increased, the installation pace of the processing facility is required, and a long working time is required.

In the case of the sander method, not only the work efficiency is remarkably poor, but also a loud noise is generated, and a large amount of dust is scattered and floated as in the case of the dry sand blast method, thereby deteriorating the environment.

[0007] In the case of the stripper method, an organic solvent harmful to the human body is contained, and the peeled coating residue and waste liquid must be properly treated as industrial waste. , And acid and alkaline wastewater had to be neutralized before draining. In addition, the paint remover is applied with a brush or a low-pressure airless spray, but during work, rubber gloves, protective goggles, aprons, etc. are used so that the paint remover does not adhere to skin or clothes. Protective equipment had to be worn, and there were safety and hygiene problems.

[0008] In the case of the ultra-high pressure water method, the pressure is too strong and the substrate is easily damaged more than necessary. If the substrate is damaged, it takes time and money to repair and repair it. There was a problem that it would increase.

The present invention has been developed with the object of solving the above-mentioned problems, and does not cause pollution due to dust or noise, does not impair safety and hygiene, and damages the base more than necessary. It is an object of the present invention to provide a high-pressure hot-water stripping method with high working efficiency without any problem.

[0010]

As a means for solving the above problems and achieving the object, the present invention provides a discharge pressure of 450 k.
gf / cm ² -800 kgf / cm ² , 30 liters / min-55 liters / min of water, high-pressure hot water with a water temperature of 60-90 ° C is sprayed from a gun to peel off the surface of the object. High-pressure hot water stripping method was developed and adopted.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below. High-pressure hot water is supplied to a jet nozzle of a spray gun and jetted from the jet nozzle to peel off a coating surface of a building structure or the like. Or perform roughing work.

The temperature of the hot water used here is preferably in the range of 60 ° C. to 90 ° C. The temperature within this range is determined according to the conditions. When the temperature is 90 ° C. or higher, it is not suitable because it becomes water vapor and scatters and cannot be sprayed on the coating film surface.

The pressure at which the hot water is discharged is set at 450 kgf / cm ²
Was a ~800kgf / cm ^2, when Shitamawaru a 450 kgf / cm ^2, can not be released cleanly and be uneven coated surface, and not suitable since the time-consuming, whereas, if it exceeds 800 kgf / cm ² easily damage the underlying, the repair is not preferable since it takes time and money to repair is limited to the range described above.

The amount of water is preferably 30 liter / min to 55 liter / min. The reason is that below 30 liters / minute,
The impact force is weak and the peeling effect is not sufficient, and if it exceeds 55 liters / minute, it is not possible to hold the spray gun to spray accurately on the spray surface, especially on construction sites with poor scaffolding. Because it could not be used.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A specific embodiment of the present invention will be described below. The pump is operated at a discharge pressure of 500 kgf / cm ² and a water flow rate of 35 liter / min (C-153 hot water specification manufactured by Arikko Kogyo KK). 7
Using a fan-shaped nozzle with a nozzle diameter of 1.06 mm and a jet angle of 7 degrees in hot water at 0 ° C, an acrylic resin sealer was applied to the concrete base under the condition of a distance of 15 cm from the surface to be treated,
An acrylic resin paint is applied on the upper surface of the film surface 20m ²
Was performed in 1 hour and 17 minutes, and the remaining portion was peeled in 46 minutes.

(Comparative Example) When the other conditions were the same as those in the above-described embodiment, except that the water temperature in the above-described embodiment was changed to the tap water temperature (normal temperature water), 75% peeling was achieved in 3 hours. However, the place where the coating film was alive (the adhesion was good and the deterioration of the painted surface did not occur so much) remained after a long time.

As is clear from the above, it can be seen that hot water has higher workability than normal temperature water. When peeling with normal temperature water, if the pressure is 450 kgf / cm ² or more compared to hot water, a pressure of 1.4 to 5.6 times is required for the same amount of water.

[0018]

As described above, according to the high-pressure hot water stripping method of the present invention, the discharge pressure is 450 kgf / cm ^{2 to} 800 kgf / cm ² and the amount of water is
30 liters / minute to 55 liters / minute, high-temperature hot water with a water temperature of 60 ° C to 90 ° C is sprayed from a gun to peel off the surface of the object.
Combined with the solubility and permeability of warm water and the appropriate pressure and amount of water, it can be peeled efficiently. In addition, when working with pressure in conventional room temperature water, the substrate must be damaged and repaired, and time and expense must be devoted to repairing. Shortening and cost reduction can be achieved.

Claims (1)

(57) [Claims] 1. A discharge pressure ^{450kgf / cm 2 ~800kgf / cm 2} , water 30 l / min to 55 l / min, and sprayed from spray gun high pressure hot water temperature 60 ° C. to 90 ° C., of the object A high-pressure hot water stripping method characterized by stripping the surface.