JPH0510467B2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention is applicable to cracks and voids formed on walls of buildings, etc.
The present invention relates to a repair lid material and a repair method used when repairing the like.

Conventional technology and its problems Conventionally, when cracks, voids, etc. occur in the walls of buildings, etc., in order to seal them and prevent the growth of cracks, etc., it is necessary to inject resins such as epoxy resin. Cracks, voids, etc. are sealed and bonded.
In this way, when injecting resin into cracks, holes, etc., in order to prevent the injected resin from leaking from the injection area or the surrounding area, it is necessary to
A repair method is used in which a lid is placed over the roof, resin is injected, and the lid is removed after the injected resin has hardened.

As the material for the lid in such repair methods, fast-curing epoxy resins, various hot melt resins, and the like are usually used. However, since such resins have a very strong adhesion to the wall surface, it is difficult to remove the resin lid after construction is completed, and if it is removed, the wall surface may be damaged. There is. Particularly, when a painted surface is coated with a finishing material, the painted surface is easily damaged, causing the problem of requiring repainting.

In addition, when cracks occur on the surface, the cracks often spread over a fairly wide area inside, but since it is difficult to remove the resin,
Usually, the application area of the resin as a lid is limited to a narrow width above the crack. For this reason, there is a problem that the injected resin leaks through minute cracks or pinholes in the uncovered area and stains the surrounding walls. The cracks, the sky must stop
There is also a drawback that the resin cannot be completely filled with the resin.

Means for Solving the Problems In view of the above-mentioned problems of the prior art, the inventor of the present invention has conducted extensive research and found that a specific strippable paint is used as a lid to prevent leakage of injected resin. It has been found that by using a coating film, leakage of the injected resin can be prevented, and since the coating film made of the lid strippable paint has a suitable adhesion strength, it can be easily peeled off. Furthermore, the present inventor found that since the coating film is easy to peel off, the strippable paint does not need to be applied to the cracks where resin is injected, and can be applied over a wide range. It has also been found that leakage of injected resin from minute cracks and pinholes existing around cracks can be completely prevented.

That is, the present invention provides a cover material for repairing a wall surface and a method for repairing a wall surface as described below.

A covering material for wall repair consisting of a solvent-based strippable paint whose film-forming polymer is styrene-butadiene-styrene thermoplastic rubber.

After forming a coating film on cracks and/or voids using a wall repair covering material made of solvent-based strippable paint that uses styrene-butadiene-styrene thermoplastic rubber as the film-forming polymer, repair the area. A wall repair method characterized by injecting a plastic resin.

In the present invention, the lid is used to prevent leakage of the injected resin when injecting the resin into cracks, voids, etc., and styrene-butadiene-
A coating film is formed using a solvent-based strippable paint using styrene thermoplastic rubber as the film-forming polymer.

The strippable paint used in the present invention is usually used to prevent rust on machinery and other metal products.
It is used as a temporary coating to prevent stains and scratches, and the paint film can be easily peeled off. A coating film made of strippable paint usually has the following characteristics.

(a) The coating is tough and can withstand impact, friction, and bending.

(b) Excellent water and oil resistance, does not damage the underlying surface,
Contains no corrosive substances.

(c) The paint film has moderate adhesion and will not peel off naturally.

(d) Peeling is easy and can usually be done by hand.

The solvent-based strippable paint using styrene-butadiene-styrene thermoplastic rubber as the film-forming polymer used as the repair lid material of the present invention is as follows:
In addition to the properties of the above-mentioned general strippable paints, it has particularly excellent properties as listed below.

(1) It can be easily applied by brushing, spraying, etc., and does not require special equipment.

(2) After painting, the coating film formation time is short, and it is possible to form a coating film within one hour at room temperature.

(3) The paint film has appropriate flexibility so that it can be easily removed, and has sufficient strength to overcome the adhesive strength with the base so that the paint film will not be damaged during the removal process.

(4) The paint film should be transparent or semi-transparent, with no scratches on the base.
The state of the interspace can be observed.

(5) It does not attack the base, and the components of the paint film do not transfer to the base.

(6) Since it is a solvent type, the coating film formation time can be easily adjusted.

According to the present invention, by using a coating film made of a specific strippable paint having the above-mentioned excellent properties as a cover for cracks, voids, etc., it is possible to prevent leakage of the injected resin and cure the resin. It becomes possible to easily peel off the coating film used as a lid later. Therefore, no damage is caused to the wall surface due to peeling, and there is no need to repair the wall surface after peeling. In addition, since the coating film is easy to peel off, it can be applied over a wide area, and even if the cracks are widespread, it can prevent the injected resin from leaking from peripheral microcracks or pinholes. can. Further, since a transparent or semitransparent coating film can be formed, the filling state of the resin can be easily confirmed, which is further advantageous.

The strippable paint used as the correction lid material of the present invention contains a film-forming polymer made of styrene-butadiene-styrene thermoplastic rubber and a solvent as main components, and a release agent, etc. is added as necessary. It is something. Specific examples of solvents in such strippable paints include methyl cellosolve, ethyl cellosolve, acetone, methyl ethyl ketone, ethyl acetate, butyl acetate, n-
Examples include hexane, cyclohexane, toluene, xylene, etc., and these may be used alone or in combination. Examples of the mold release imparting material used as needed include silicone-based synthetic oil, fluorine-based synthetic oil, polyethylene glycol, and the like. The concentration of film-forming polymer in strutpable paint is determined by the method of use, etc.
The concentration may be set so as not to impede workability, and the resin concentration is usually about 15 to 70% by weight.

In the present invention, from the above-mentioned strippable paint, depending on the roughness of the wall surface, for example, the anchor effect works on rough wall surfaces such as sprayed material, so strippable paint with weak adhesive strength is used. Furthermore, the adhesive strength may be adjusted appropriately, such as by using strippable paint, which has a relatively strong adhesive strength, on smooth surfaces such as ceramic tiles.

As mentioned above, the strippable paint used in the present invention has excellent workability, and the coating film formed has an appropriate adhesive strength that prevents leakage of the injected resin and allows easy peeling. It has both high strength and paint film strength, and there is no damage or peeling of the paint film due to resin injection pressure, and the paint film can be easily peeled off after resin injection without damaging the wall surface. On the other hand, when applying other conventionally known strippable paints, it is necessary to apply a coating that has appropriate adhesion and film strength, such as the one formed by the strippable paint used in the present invention. Unable to form a film. For example, strippable paint, which uses polyvinyl alcohol as a resin component, has a slow film formation speed, so it takes a long time to form a strong, thick film. When used for this purpose, the film thickness must be reduced. However, such a thin coating film is
The repair method of the present invention cannot be applied because the strength is insufficient and the coating film is damaged by the resin injection pressure, causing leakage of the injected resin. In addition, when using strippable paints whose resin components are vinyl acetate-ethylene polymers, ethylene-vinyl chloride polymers, etc., the strength of the paint film is hard, so the resistance during peeling is large, and the film thickness is thin. Some parts are easily damaged during peeling, making it impossible to remove the coating film smoothly after resin injection.

In the wall surface repair method according to the present invention, first, dirt and deposits on the wall surface and inside cracks, voids, etc. are removed according to a conventional method, and then the covering material made of the above-mentioned specific strippable paint is removed from the cracks and/or holes. Apply on the sky. Before applying the lid material, an injection device may be fixed to the injection position with an adhesive or the like, or the injection device can be installed after the lid material is applied. The area to be coated may be adjusted as appropriate depending on the state of occurrence of cracks and/or voids, and if the cracks or the like are spread over a wide area, the coating may be applied to the entire surface of the area where the cracks or the like have occurred. From the viewpoint of workability, brushing and spraying are preferred as the application method. The thickness of the coating film varies depending on the condition of the wall surface, the type of polymer forming the coating film, etc., but is usually about 0.5 to 2.0 mm.

After the coating is formed, a repair resin is injected into the cracks and/or voids. The injection resin may be one commonly used in this field, such as epoxy resin, unsaturated polyester, etc. With the repair lid material of the present invention, a lid made of a transparent or translucent coating can be formed, so the state of resin injection into cracks or cavities can be observed, and construction is facilitated.

Injection can be carried out according to conventional methods; for example, a simple method such as a grease pump can be used.
In the case of narrow gaps, etc., it is necessary to gradually inject the resin over time, so an injection tool of the type shown in FIG. 1 can also be used. The tool shown in FIG. 1 stores a bellows-shaped telescopic container 1 filled with resin in a transparent synthetic resin case 2, pressurizes the telescopic container 1 with a spring 3, and presses a spout tube 4 of the telescopic container 1. The nozzle 5 of the case 2 is connected to a nozzle 5 provided at the tip of the case 2, and the nozzle 5 of the case 2 is connected to a mounting washer 7 glued to a wall surface 6. Inject into 8.

After the filled resin has hardened, the coating is peeled off and the injection plug is removed. The paint film can be easily peeled off, so it will not damage the wall surface. Therefore, after peeling off the coating, it is only necessary to finish the areas where cracks or voids have occurred, if necessary.

The wall surfaces to which the method of the present invention can be applied are not particularly limited, and examples include concrete surfaces, mortar surfaces, acrylic lysine painted surfaces on concrete or mortar, elastic painted surfaces such as acrylic and urethane, and tile surfaces made of ceramics etc. can.

Effects of the Invention The present invention provides the following excellent effects.

Since the coating film formed by the lid material of the present invention has appropriate adhesion and strength, the coating film will not be damaged or peeled off due to resin injection pressure, and leakage of the injected resin from cracks, voids, etc. can be prevented.

The paint film on the lid material can be easily peeled off without damaging the wall surface. It is particularly effective for surfaces painted with spray finishing materials.

Since it can be easily peeled off even when a coating film is formed over a wide area, the lid material can be applied over a wide area to prevent leakage of the injected resin from minute cracks or pinholes.

Since a transparent or semi-transparent coating film can be formed, the filling state of the injected resin can be easily confirmed.

Even if there is a difference in level between the joint cement part and the tile part, such as on a tile surface, the lid material can be applied uniformly, so leakage of the injected resin can be completely prevented.

EXAMPLES The present invention will be explained in more detail with reference to Examples below.

Example 1 On the outer wall of a condominium made of mortar with acrylic lysine sprayed material, the width is 0.3 to 1.0 mm and the depth is 50 to
Repair work was carried out using the method shown below for the area where a 150mm crack had occurred in an area of 2m wide and 5m long.

Dirt on the walls and inside the crack in the area where the crack occurred was blown off with compressed air, and after thorough cleaning, plugs for resin injection were fixed at every 300 mm length of the crack using epoxy adhesive. Next, the mixture having the composition shown in Table 1 was allowed to stand at room temperature for 2 hours to sufficiently wet the polymer with the solvent, and then mixed for about 30 minutes using a mixer equipped with a mixing blade to obtain a strippable paint. It was applied to the entire surface of the crack occurrence area to a thickness of about 2 mm, and after being left for 1 hour, a coating film of about 0.8 mm thickness was formed. FIG. 2 shows a cross-sectional view of the wall surface after the coating film has been formed. In the figure, 9 is the wall surface, 10 is the coating film,
11 is crack, 12 is empty, 13 is plug, 1
4 is an adhesive, and 15 is a grease pump.

Table 1 Styrene-butadiene-styrene block copolymer* 40 parts by weight Toluene 30 parts by weight Cyclohexane 25 parts by weight Polyethylene glycol 5 parts by weight *Trademark "Solprene T-475", manufactured by Asahi Kasei Corporation Next, using a grease pump Epoxy resin was injected into the crack through the injection plug.

The injection work was carried out while observing the filling state of the resin from the top of the coating film into the crack. The amount of injection was approximately 27 c.c. per injection plug in a portion with a crack width of approximately 1 mm, and approximately 8 c.c. per injection plug in a portion with a crack width of approximately 0.3 mm. The injection time is approximately 1 minute (injection speed: approximately 0.45 cc/sec) for a crack width of approximately 1 mm, and approximately 2 minutes (injection speed: approximately 0.067 cc/sec) for a crack width of approximately 0.3 mm.
The injection pressure was about 2.0 to 2.5 Kgf/cm ² at a crack width of about 1 mm, and about 4.0 to 4.5 Kgf/cm ² at a crack width of about 0.3 mm.

After the filled epoxy resin had hardened, the coating was peeled off and the injection plug was removed. There is no leakage of the injected epoxy resin to the outside of the paint film or around the cracks under the paint film, and the paint film is easy to peel off.
The work was completed without damaging the wall. Therefore, a good finish was obtained simply by applying the same quality lysine spray material along the crack repair area.

In addition, the same strippable paint as in the above method was applied to an asbestos board with a width of 50 mm, from which dust and other dirt had been removed.
Apply to a thickness of 2 mm, and after the coating film has sufficiently cured, 180°
The peel adhesive strength was measured and found to be 1.0 kg/5 cm.

On the other hand, an attempt was made to measure the 180° peel adhesive strength in the same manner using an epoxy resin (bisphenol A-based amine curing type), but the coating could not be peeled off. In addition, when a similar peel adhesion strength test was carried out by adding 2% silicone oil-based mold release agent to the above epoxy resin, the coating film could not withstand 180° bending and broke, making it impossible to measure the peel strength. I couldn't do it.

Example 2 Exterior wall of an apartment building with acrylic sprayed elastic tiles applied to mortar with a width of 0.3 to 1.0 mm and a depth of 50 mm to
Repair work was carried out on an area where a 150mm crack had occurred in an area of 3m wide and 5m wide. The repair method was the same as in Example 1 except that the composition shown in Table 2 was used as a strippable paint.

Table 2 Styrene-butadiene-styrene block copolymer* 40 parts by weight Toluene 40 parts by weight Cyclohexane 20 parts by weight *Trademark "Solprene T-475", manufactured by Asahi Kasei Corporation After the resin was cured, the coating was peeled off. There was no leakage of epoxy resin and no damage to the walls.

Furthermore, the adhesive strength was measured in the same manner as in Example 1 using the strippable paint shown in Table 2 and found to be 1.5 kg/5 cm.

Comparative Example 1 As a model test for exterior wall repair work, a 300 mm x 600 mm x 50 piece with acrylic ricin coating material sprayed on the surface
A specimen with a crack of approximately 0.5 mm in width and approximately 300 mm in length was created in a mortar block of mm (thickness).
Epoxy resin injection work was carried out using the method shown below.

First, after thoroughly cleaning the crack by blowing away dust and the like around the crack with compressed air, a plug for resin injection was fixed at the center of the length of the crack with an epoxy resin adhesive. Next, polyvinyl alcohol (Kuraray Poval) adjusted to a suitable viscosity for the work was used.
A 15% aqueous solution of PVA217 (manufactured by Kuraray Co., Ltd.) was applied to the cracked surface to a thickness of 2 mm, but a uniform coating could not be formed even after 24 hours, which was inappropriate for the work process.

A similar specimen was newly coated with the above 15% polyvinyl alcohol aqueous solution to a thickness of approximately 0.7 mm.
A coating film of approximately 0.1 mm was formed on the next day. Epoxy resin was then injected into the crack as in Example 1. Injection was performed by gradually increasing the injection pressure, but the injection pressure decreased approximately 10 seconds after the injection started.
When the weight reached approximately 1.7 kg±/cm ² , the coating film was damaged and the injected resin leaked from the coating surface.

Comparative Example 2 A specimen similar to that used in Comparative Example 1 was mixed with 55% vinyl acetate-ethylene polymer as the resin content.
A milky-white emulsion-type strippable paint was applied and left to stand for 5 to 6 hours, and then re-applied and left to stand for 10 hours to form a coating film with a thickness of about 0.8 mm. Then, in the same manner as in Comparative Example 1, epoxy resin was injected into the crack. The amount injected from one plug was about 7 c.c., and the injection was completed in about 30 seconds (injection speed 0.23 cc/sec). The pressure during injection is 2.3
It was about 2.7Kgf/ ^cm2 . After the injection, the coating made of the nibyl acetate-ethylene polymer was peeled off, but the coating broke midway and could not be peeled off smoothly.

Comparative Example 3 A coating film was formed and an epoxy resin was injected in the same manner as in Comparative Example 2, except that a milky white emulsion type strippable paint containing 50% ethylene-vinyl chloride polymer was used as the resin component. . After the injection, the coating film was peeled off, but as in the case of Comparative Example 2, the coating film broke midway and could not be peeled off smoothly.

[Brief explanation of the drawing]

Figure 1 is a sectional view of an example of a resin injection tool, Figure 2 is a cross-sectional view of an example of a resin injection tool;
The figure is a sectional view showing one embodiment of the present invention. 1 is an extensible container for injection resin, 2 is a synthetic resin case, 3 is a spring, 4 is a pouring pipe, 5 is a nozzle of a synthetic resin case, 6 is a wall surface, 7 is a mounting washer, 8 is a crack, 9 is a In the cross section, 10 is a coating film made of strippable paint, 11 is a crack, 12 is a void, 13 is a plug, 14 is an adhesive, and 15 is a grease pump.

Claims (1)

[Scope of Claims] 1. A covering material for wall repair consisting of a solvent-type strippable paint whose film-forming polymer is styrene-butadiene-styrene thermoplastic rubber. 2. Using a wall repair lid material made of solvent-based strippable paint that uses styrene-butadiene-styrene thermoplastic rubber as the film-forming polymer,
After forming a coating film on the areas where cracks and/or voids occur,
A wall repair method characterized by injecting a repair resin.