JPS6198871A - Repairing of outer wall - 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] Industrial applications The present invention relates to a method for repairing an exterior wall.

BACKGROUND TECHNOLOGY Conventionally, as shown in FIG. 4, when a crack (2) has formed on the outer wall (11) of a building, it has generally been repaired using the following method.

The outline of the first method will be explained with reference to FIGS. 5 to 8. First, the base material layer (3) and the surface coating material layer (4) are cut out (5) to have a rectangular cross section, including the crack (2) portion (FIG. 5). This resection (
Fill 5) with putty (6) and seal it (Figure 6). Next, fill with filler (7) to correct uneven areas (Figure 7)
. Finally, the entire surface is polished and the original coating material layer (4)
Lay another layer of coating material (8) on top (Figure 8).

The second method is to create a crack (2) as shown in Figure 9.
A simple method is to apply putty (6) to the area, let it dry, and then repaint only that area (9).

Problems to be Solved by the Invention In the first method, even if there are few cracks (2), the entire surface must be repainted, which not only increases costs, but also requires construction work such as surrounding curing. becomes a big deal. Also, in the second method, the putty (6) part is much wider than the crack (2) part, so ? There is a problem in that the ili correction width also expands accordingly, making it more noticeable.

Means for Solving the Problems The present invention has been made to solve such problems, and after filling the crack (15) part of the outer q (11) with an instant adhesive, the crack is removed. The repair painting (20) is applied only to the part (15).

Embodiment' In Fig. 2, (1G) (10) is the outer wall (1
1) is the base material. For this base material (10), for example, "Moen Siding", a trade name of Nippon Hardboard Industries, is used. (12) are these base materials (10) (
This is a putty layer which is filled by cutting out the outside of the joint (13) between 1 (j) in advance to have a triangular cross section. As the putty material, for example, Aikani Gyo's product name "Evo Putty" is used. Therefore, (14) is based on these base materials (10)
(10) and a coating material layer formed on the outside of the putty layer (12). As the coating material, for example, Aikani Gyo's product name "Joribat" is used.

(15) shows a crack formed from the joint (13) of the base material (10) (10) to the surface of the coating material layer (14).

Reference numeral (16) in FIG. 1 is a container for instant adhesive. As this instantaneous PJ adhesive, for example, "Aron Alpha", a trade name of Toagosei Chemical Industry Co., Ltd., is used. That is, in the present invention, an instant adhesive is used as a filler in the crack (15), and the instant adhesive flows out from the tip of the nozzle (17) of the container (16) to fill the crack (15). This forms a layer (18). Instant adhesives have a lower viscosity than the commonly used materials, so
It has the characteristics that it penetrates sufficiently deep into the crack (15) (19) by capillary action and that it takes a short curing time. Therefore, it is possible to immediately move on to the next operation without requiring a curing period.

Then, as shown in FIG. 3, the repair coating (2
0) to complete the repair work. In this case, the instant adhesive is applied to the deep part (15) of the crack (15) as described above.
9) and is firmly bonded to the interface between the base material (10) and the putty layer (12).・The part exposed to the surface of the coating material layer (14) is separated from the exposed part of the crack (15).
There's no need to. Therefore, there is no need for the repair coating (20) to be wider than the width of the cracked portion.

Test Example Next, a test example will be described in which it was investigated how the use of an instant adhesive as a temporary adhesive during construction affects the exterior wall, particularly its appearance, with reference to the test results. In addition, commercially available products with specifications as shown in Table 1 were used in the test. I will post them all at once.

Margin table below 1 *1 It has been used to accelerate the hardening of Aron Alpha and shorten the construction time in cases where it cannot be used alone or there are large cracks.

When Aron Alpha is used as an instant adhesive, if a or a setter is added as a curing accelerator, yellowing may become noticeable. Therefore, an ``initial discoloration'' test was conducted to find out whether the yellowing was caused only by the filler (in this case, Aron Alpha + a, a setter) or whether the coating material also had an effect. This initial discoloration test was conducted according to the following procedure.

(2) Moen siding was cut into 150 x 70 pieces as a base material, and coated with a coating material.

(2) After the material to be coated had hardened, filler was applied in three areas.

(2) After the filler had hardened, the coating material was applied again to see if it would turn yellow.

For comparison, we also investigated the case where the filler was applied directly to Moen siding. The test was conducted outdoors in a location exposed to direct sunlight. The types of specimens and test results are listed in Table 2.Next, we conducted a "water resistant" test to check whether the color changes over time due to direct sunlight or rainwater, and a "water resistant" test to check whether the filler will change color over time due to direct sunlight or rainwater. An ``adhesiveness'' test was conducted to confirm whether the adhesiveness of the coating material decreased. In both cases, deterioration was accelerated under the following conditions using a fluorescent ultraviolet irradiation tester for exterior materials. That is, temperature 60
After 8 hours of ultraviolet irradiation at a temperature of 40°C, condensation was continued for 4 hours until 500 hours. The light fastness test was conducted only on specimens that did not change color significantly in the initial discoloration test (however, since a, a setter is usually used only as a curing accelerator, specimens coated only with a, a setter were excluded) ), the test results are also listed in Table 2.

On the other hand, in the adhesion test, the filler was placed at 40°C on Moensighting cut into a size of 60 tm x 60 + u.
A plane tensile test was conducted using a test piece on which the coating material was coated over an area of m x 4 Q tx.

The types of test specimens and test results are shown in Table 3.

Margin table below - 2 *3 When the material to be coated is Evo putty, there is a considerable discoloration regardless of the presence or absence of a and a setters (this is because the Epo putty changes to yellowish brown due to heat and that color is reflected as is). It is.

Below Margin Table-3 After considering the test results for the following margins, the following became clear.

First, regarding initial discoloration and light fastness, it is thought that yellowing will not occur immediately after construction if a, a setter is not used. Aron Alpha will slightly yellow when exposed to direct sunlight for a long time, but it is hidden by the coating material on top and is not noticeable in appearance.

On the other hand, when using a or a center, the sheath will yellow considerably in the initial stage, regardless of the type of coating material. Yellowing will progress further over time and will be noticeable in appearance unless the coating material is thick and uniformly coated.

The cause of yellowing is that the N-H bond of the aromatic amine, which is the main component of the a setter, absorbs the energy of ultraviolet rays and becomes excited, and is oxidized and turned into a solid by ozone (03) in the atmosphere. This is thought to be due to the production of nitro compounds.

Furthermore, the reason why the degree of yellowing increased when a top coat was applied is presumed to be because the surface of the material to be coated becomes smoother by applying the top coat, making it less likely to cause diffused reflection.

On the other hand, in terms of adhesion, Jolipasoto has excellent adhesion to fillers even after many years. On the other hand, Shibolock has poor normal adhesion and may peel off over time.

In conclusion, first of all, the degree of discoloration and fading of Aron Alpha due to aging is small. However, if the curing accelerators a and a center are used together, there will be considerable damage in the initial stages, so we believe that the use of a and a center should be avoided in actual construction.

Next, as mentioned above, the adhesion of Shibolok to Aron Alpha is extremely poor. Therefore, it was concluded that Jolipat should be used as the coating material.

Effects of the Invention - As described above, the present invention is characterized in that after the cracked portion is filled with an instant adhesive and closed, only the cracked portion is painted. Therefore, the following effects can be obtained. It will be done.・■ Since only the cracks are painted, it is relatively easy to match the color of the paint material.

■・Since the repair width is only the crack area, it is hardly noticeable.

■It is easy to work as it does not require large tools.

■It only requires an amount of instant adhesive to fill the crack and a repair coating material to apply to the exposed part (crack part) of the filled adhesive layer, and it is a simple operation. , can be constructed at low cost.

■Since there is no need for putty curing, etc., the work time can be shortened.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view of an outer wall showing a state in which instant adhesive is filled in a crack in an embodiment of the present invention, Fig. 2 is a cross-sectional view showing a state in which a crack has also appeared, and Fig. The figure is also a sectional view showing the state after the work is completed, and Figure 4 is
Cross-sectional view showing the state where cracks have occurred in the outer wall, Figure 5~
FIG. 8 is a sectional view showing a conventional example, and FIG. 9 is a sectional view showing another conventional example. (15)...Crack, (1 day)...A layer, (20)...Repair painting. Patent applicant Agent: Sekisui House Co., Ltd.
Patent Attorney Hisashi Tarumoto Figure 7 Figure 9z Figure 6

Claims (1)

[Claims] An exterior wall repair method characterized by filling the cracked area with instant adhesive and closing it, then painting only the cracked area.