JPH0364029B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a method for repairing cracks, voids, etc. occurring in walls of buildings, etc.

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., cracks are injected with resin such as epoxy resin. , air gaps, etc. are sealed and bonded.
In this way, when injecting resin into cracks, voids, etc., in order to prevent the injected resin from leaking from the injected area or its surroundings, place a lid over the crack, void, etc., and then inject the resin. The method used is to inject the resin and remove the lid after the injected resin has hardened.

As the material for the lid in such a method, fast-curing epoxy resins, various hot melt resins, etc. 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. be. 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 in that the injected resin leaks through minute cracks or pinholes in the uncovered area and stains the surrounding walls. Furthermore, if the injection resin leaks,
Another drawback is that resin injection cannot be completely filled into cracks, voids, etc. because the resin injection must be stopped.

Means for Solving the Problems The present inventor has conducted extensive research in order to solve the problems of the prior art in the method of repairing cracks, voids, etc. by resin injection as described above. the result,
By using a paint film made of a removable resin composition with a specific composition as a lid to prevent leakage of injection resins, the paint film as a lid can be easily removed without damaging the wall surface after construction is completed. In addition, the peelable resin composition has been found to be able to easily adjust the curing time at room temperature, thereby making it possible to shorten the construction period. Furthermore, the above-mentioned removable resin composition can be used as a fixing adhesive when fixing a resin injection device to a wall surface, and the fixing device can be easily removed after construction is completed without damaging the wall surface. I found out. The present invention is based on these findings.

That is, the present invention provides the following wall surface repair method.

a polyurethane resin composition containing an isocyanate group-containing compound, a hydroxyl group-containing compound, a curing accelerator, and a release agent, b an epoxy resin composition containing an epoxy resin, a curing agent, and a release agent, and c unsaturated polyester. resin, vinyl monomer,
A releasable resin composition selected from unsaturated polyester resin compositions containing a curing accelerator, a catalyst, and a releasability imparting agent is applied to cracks and/or voids to form a coating film, and then used for repair. A wall repair method characterized by injecting resin.

a polyurethane resin composition containing an isocyanate group-containing compound, a hydroxyl group-containing compound, a curing accelerator, and a release agent, b an epoxy resin composition containing an epoxy resin, a curing agent, and a release agent, and c unsaturated polyester. resin, vinyl monomer,
A peelable resin composition selected from unsaturated polyester resin compositions containing a curing accelerator, a catalyst, and a peelability imparting agent is applied to cracks and/or voids to form a coating film, and the composition is applied. A method for repairing a wall surface, which comprises fixing a repair resin injection device to a wall surface using the composition before or after coating, and injecting the repair resin after forming a coating film.

In the present invention, the peelable resin composition used is a resin composition whose curing time can be arbitrarily adjusted at room temperature and which has appropriate adhesion to wall surfaces. Suitable base polymers for such resin compositions include polyurethane resins, epoxy resins, unsaturated polyester resins, etc., and polyurethane resins are particularly preferred in terms of ease of adjusting flexibility. Further, when using a rigid resin such as an epoxy resin or an unsaturated polyester resin, it is preferable to use one whose main chain is modified with a soft segment such as polyurethane.

As a preferable polyurethane resin, hydroxyl group 2
A hydroxyl group-containing component such as polyoxypropylene glycol alone or a copolymer with polyoxyethylene glycol having a molecular weight of about 400 to 77,000 containing ~3 and purified tolylene diisocyanate, crude tolylene diisocyanate, purified diphenylmethane diisocyanate, Examples include crude diphenylmethane diisocyanate or an isocyanate group-containing component such as an isocyanate-terminated prepolymer of these and the above-mentioned hydroxyl group-containing substance.

Preferred epoxy resins include glycidyl ether type epoxy resins such as bisphenol A type, bisphenol F type, novolak type and brominated biphenyl type.

Examples of preferred unsaturated polyester resins include esterified polycondensates obtained using maleic anhydride as the unsaturated polybasic acid, phthalic acids as the saturated polybasic acid, propylene glycol, ethylene glycol, etc. as the polyhydric alcohol. can.

In the resin composition used in the present invention, the following curing agents are used depending on the type of resin in order to adjust the curing time.
It is necessary to blend a catalyst etc.

For polyurethane resins, in order to adjust the curing time, various tertiary amines or metal salts are used as curing accelerators, preferably dibutyltin dilaurate or dibutyl, depending on the type and amount of the isocyanate group-containing compound and the hydroxyl group-containing compound. tin dimaleate,
Contains tin and lead fatty acids such as dibutyltin acetate, tin octylate, and lead octylate. The amount of curing accelerator added is based on 100 parts by weight of the base polymer.
The amount may be approximately 0.05 to 3.0 parts by weight. Here, the base polymer amount refers to the total amount of the isocyanate group-containing component and the hydroxyl group-containing component.

In the case of epoxy resins, the curing time can be adjusted by the type and amount of curing agent added. As a curing agent, various commonly used amines can be used, and the amount used depends on the base polymer.
The amount may be about 10 to 100 parts by weight per 100 parts by weight. Preferred curing agents include diethylenetriamine, triethylenetetramine, tetraethylenepentamine, bishexamethylenetriamine, polymethylenediamine, diaminodiphenylmethane, amine adducts of these compounds with epoxy resins, or dimers obtained from linoleic acid and oleic acid. Examples include polyamide resins produced by reaction with acids, and other polymercaptan compositions having excellent low-temperature curability can also be used.

In the case of epoxy resin, triethylenediamine, 2-
(dimethylaminomethyl)phenol, 2,4,
Tertiary amines such as 6-tris(dimethylaminomethyl)phenol can be used up to about 20 parts by weight based on 100 parts by weight of the base polymer, but in many cases, the curing agent is not reactive with epoxy group-containing compositions. Adjust the curing time depending on the time.
In the case of an epoxy resin, the base polymer amount refers to the total amount of the epoxy group-containing component and the amine-containing component used as a curing agent.

When using an unsaturated polyester resin, the curing time can be adjusted by adding a vinyl monomer for crosslinking, a curing accelerator, and a curing catalyst. As the vinyl monomer, styrene is most often used, but methylstyrene, vinyltoluene, vinyl acetate, methyl methacrylate, etc. can also be used. As the curing accelerator, dimethylaniline, cobalt naphthenate, p-toluenesulfonic acid, naphthalenesulfonic acid, etc. can be used. As the catalyst, benzoyl peroxide, methyl ethyl ketone peroxide, etc. can be used. The amount of the vinyl monomer used may be about 10 to 100 parts by weight per 100 parts by weight of the unsaturated polyester. Curing accelerator is base polymer
The amount of the catalyst may be about 0.3 to 5 parts by weight per 100 parts by weight of the base polymer. In the case of an unsaturated polyester, the base polymer amount refers to the total amount of an unsaturated polybasic acid, an unsaturated polyester obtained by a condensation reaction of a saturated polybasic acid, and a polyhydric alcohol, and a vinyl compound.

Moreover, in the peelable resin composition used in the present invention,
A releasability imparting agent is added to give the cured product appropriate releasability. As a release agent, silicone-based synthetic oil, fluorine-based synthetic oil, melting point of about 50 to 90℃ is used.
Examples include _C14 to _C30 saturated fatty acids, which can be used alone or in appropriate combinations. Examples of the saturated fatty acids include myristic acid, palmitic acid, stearic acid, nondecylic acid, arahinic acid, lignoceric acid, cerotic acid, melisic acid, and the like. The amount of releasability imparting agent added must be such that it can prevent leakage of the injected resin and provide a cured product with appropriate adhesion that can be easily peeled off after completion of construction. is the base polymer
The release agent may be added in an amount of about 0.1 to 30 parts by weight per 100 parts by weight.

The peelable resin composition used in the present invention may further contain plasticizers, fillers, anti-sagging agents, and the like, if necessary. As plasticizers, phthalate esters, other esters, various process oils, etc. are used to adjust the flexibility of cured products and the consistency of premixes, and up to about 100 parts by weight per 100 parts by weight of the base polymer. Can be mixed.
As fillers, various types of calcium carbonate, talc,
Clay and the like are used to adjust the consistency of premixes and improve workability, and can be blended in amounts up to about 200 parts by weight per 100 parts by weight of the base polymer. As anti-sagging agents, silicic anhydride, hydrogenated castor oil, amide-based anti-sagging agents, asbestos-based anti-sagging agents, etc. are used to improve workability.
Up to about 20 parts by weight can be added to 100 parts by weight.

Furthermore, the above-mentioned peelable composition may contain, if necessary,
Anti-aging agents, coloring pigments, etc. can be blended as appropriate, and conventionally known viscosity modifiers can also be blended to improve workability.

In the repair method of 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 a removable resin composition is applied onto the cracks and/or voids. Before applying the release resin composition,
An injection device may be fixed to the injection position of the repair resin with an adhesive or the like, or the injection device may be installed after application. The adhesive used for fixing the injection device may be a conventionally used adhesive such as epoxy resin, but when the above-mentioned releasable resin composition is used as the adhesive for fixing the injection device, it is possible to Advantageously, the injection device can then be easily removed without damaging the wall surface.

The removable resin composition applied to cracks and/or voids and the removable resin composition used for fixing the injection device may have the same composition, but the composition for fixing the injection device may have the same composition. In order to prevent shifting due to the weight of the fixing device, we add fillers, anti-sagging agents, etc. to make it thixotropic and have an appropriate consistency in the premix state, and furthermore, to shorten the fixation time of the injection device, we harden it. Preferably, a large amount of time adjusting agent is added. For example, when a polyurethane resin is used, it is preferable to use highly active diphenylmethane diisocyanate as the isocyanate component for fixing the injection device. For coating on cracks and/or voids, it is preferable not to add materials that make the coating film opaque, such as fillers, so that the condition of the crack can be observed when injecting the repair resin, and it is preferable to apply it over a wide range. When it is necessary to apply the composition to a container, it is preferable to reduce the amount used to adjust the curing time so that a sufficient pot life can be obtained. Furthermore, when using a polyurethane resin, for example, it is preferable to blend mildly active tolylene diisocyanate into the coating composition.

The range in which the peelable resin composition is applied may be adjusted as appropriate depending on the state of occurrence of cracks and/or voids, and in the case where cracks, etc. are widespread, it may be applied to the areas where cracks, etc. occur. 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 and the type of polymer forming the coating film, but it is usually about 0.5 to 2.0 nm. In the present invention, the curing time of the coating film can be arbitrarily set by appropriately adjusting the blending composition using the above-described peelable resin composition. Therefore, unlike conventional solvent-type resins, it does not take a long time to dry the coating film, and injection of the repair resin can be started, for example, 2 to 3 hours after application.

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. When the lid is covered with a transparent or translucent coating, the state of resin injection into the cracks or voids can be observed, making construction easier.

Injection can be carried out according to conventional methods; for example, a simple method such as a grease pump is used, but in the case of narrow gaps etc., it is necessary to gradually inject the resin over time, so the first method is used. An injection tool of the type shown in the figure is sometimes used. The tool shown in FIG. 1 stores a bellows-shaped telescopic container 1 filled with resin in a transparent case 2 made of synthetic resin, 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. Further, when a removable resin composition is used for fixing the injection plug, it is more preferable because the wall surface is hardly damaged even when the injection plug is removed. Therefore, after peeling off the paint film, it is only necessary to perform finishing treatment on the areas where cracks or voids have occurred, if necessary.

There are no particular restrictions on the wall surfaces to which the method of the present invention can be applied, and examples include concrete surfaces, mortar surfaces, acrylic syringe painted surfaces on concrete or mortar, elastic painted surfaces such as acrylic and urethane, and tile surfaces made of ceramic etc. can.

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

In the peelable resin composition used in the present invention, by adjusting the resin composition and the type and amount of the curing accelerator, the curing time of the coating film at room temperature can be set appropriately. There is no need to leave it unattended for a long time, which shortens the period of repair work. Furthermore, the removable resin composition can be easily adjusted at the work site.

Since the coating film made of the peelable resin composition 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 is easy to peel off and does not damage 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 peelable resin composition can be applied over a wide area in order to prevent leakage of the injected resin from minute cracks or pinholes.

When using a peelable resin composition that forms a transparent or translucent coating film, the filling state of the injected resin can be easily confirmed.

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

When a repair resin injection device is made of a removable resin composition, there is almost no damage to the wall surface when the device is removed.

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

Example 1 On the outer wall of Manyon, where mortar was sprayed with acrylic lysine, the width was 0.5 to 0.8 mm, and the depth was 50 to 50 mm.
Repair work was carried out using the method shown below for a 150mm crack area that was 3m wide and 5m long.

That is, first, the dirt on the wall surface and inside of the crack in the area where the crack occurs is blown away with compressed air, and after thoroughly cleaning the crack, plugs for resin injection are placed at every 300 mm of the crack length using the formulation and manufacturing method shown in (a) below. It was fixed with the obtained composition.

Next, a composition obtained by the formulation and manufacturing method shown in (b) below was applied to a thickness of about 1 mm over the entire area where cracks occurred, and left to stand for 30 minutes to form a cured coating. FIG. 2 shows a cross-sectional view of the wall surface after the coating film has been formed.
In the figure, 9 is a wall surface, 10 is a coating film made of the composition (b) below, 11 is a crack, 12 is a gap, 13 is a plug, 14 is an adhesive (a) below, and 15 is a grease pump.

Epoxy resin was then injected into the crack through the injection plug using a grease pump. The injection work was carried out while observing the filling state of the resin from the top of the coating film into the crack. After the filled epoxy resin had hardened, the coating was peeled off and the injection plug was removed along with the adhesive. There was no leakage of the injected epoxy resin to the outside of the paint film or the area around the cracks under the paint film, and the paint film and adhesive were easily peeled off, and the work was completed without damaging the wall surface. Therefore, a good finish was obtained simply by applying the same quality lysine spraying material along the crack repaired area.

(a) Plug fixing composition Each compound in component A below was dissolved at 95% in a nitrogen stream.
The mixture was reacted with stirring at ℃ for 4 hours to obtain a prepolymer which was a viscous transparent liquid containing 2.2% NCO.

A Component Γ Polypropylene glycol (MW4700, triol) 50 parts by weight Γ Polypropylene glycol (MW3000, diol) 50 〃 Γ Diphenylmethane diisocyanate
16.3 Next, while stirring each compound of component B below,
After heating to 90°C to dissolve stearic acid, the mixture was cooled to room temperature while stirring to obtain a homogeneous white paste mixture.

B Component Γ Polypropylene glycol (MW4700, triol) 100 parts by weight Γ Dibutyltin dilaurate 0.5 〃 Γ Stearic acid-treated colloidal calcium carbonate
109 〃 Γ Stearic acid 10 〃 As a result of mixing the A component and B component obtained by the above method at a ratio of A component: B component = 1:1.5 (weight ratio),
A composition with a pot life of 10 minutes and a curing time of 40 minutes was obtained. The cured product of this composition has a hardness of 35 (JIS
K630l, type A hardness tester).

(b) Composition for coating film Each compound in component A below was dissolved at 95% in a nitrogen stream.
React with stirring at ℃ for 5 hours,
A prepolymer which is a viscous transparent liquid with 2.3% NCO was obtained.

A Component Γ Polypropylene glycol (MW4700, triol) 100 parts by weight Γ 2.4/2.6:80/20 triresin isocyanate
11 〃 Next, each compound of component B below was heated to 90℃ while stirring with a planetary mixer (manufactured by Inoue Seisakusho).
After the stearic acid was dissolved, the mixture was cooled to room temperature while stirring to obtain a uniform translucent liquid.

B Component Γ Polypropylene glycol (MW3000, triol) 70 parts by weight Γ Polypropylene glycol (MW3000, diol) 30 〃 Γ Dibutyltin dilaurate 0.4 〃 Γ Stearic acid 3 〃 The A component and B component obtained by the above method were combined into A component: B As a result of mixing components at a ratio of 1:0.5 (weight ratio),
A composition with a pot life of 3 hours and a curing time of 7 hours was obtained. The cured product of this composition has a hardness of 30 (JIS
K6301, type A hardness tester).

Using the composition obtained in (a) above, JIS A
-5536 When the tensile adhesive strength in the normal state was measured under test conditions similar to 4.1, it was 5.2 Kg/cm ² .
In addition, the composition obtained in (b) above was applied to a 50 mm width and 1 mm thickness on an asbestos board from which dust and other stains had been removed, and after the coating film was sufficiently cured, the 180° peel adhesive strength was measured. The weight was 1.2Kg/5cm.

Example 2 Repair work was carried out on a portion of the exterior wall of a house made of ceramic tiles where cracks with a width of 0.4 mm had occurred over an area of 1000 mm x 500 mm.

The repair method was the same as in Example 1, except that the composition shown in (c) below was used as the plug fixing composition, and the composition shown in (d) below was used as the coating film forming composition.

When the paint film and plug were removed after the resin had hardened, there was no leakage of the epoxy resin and no damage to the wall surface.

(c) Plug fixing composition Each compound in component A below was dissolved at 95% in a nitrogen stream.
℃ for 4 hours with stirring to remove NCO.
A prepolymer was obtained which was a viscous transparent liquid containing 2.25%.

A Component Γ Polypropylene glycol (MW4700, triol) 100 parts by weight Γ Diphenylmethane diisocyanate
16.8 Next, each compound of component B below was stirred and mixed using a planetary mixer for about 1 hour until uniform, to obtain a white paste composition.

B Component Γ Polypropylene glycol (MW4700, triol) 100 parts by weight Γ Dibutyltin dilaurate 0.5 〃 Γ Heavy calcium carbonate 178 〃 Γ Silicone oil (Trademark: Silicone Oil L-45, Nippon Unica Co., Ltd.) 2 Obtained by the above method As a result of mixing the A component and B component at a ratio of A component: B component = 1:2 (weight ratio),
A composition with a pot life of 10 minutes and a curing time of 30 minutes was obtained. The cured product of this composition has a hardness of 45
(JISK630l, type A hardness tester).

(d) Composition for coating film Each compound in component A below was dissolved at 95% in a nitrogen stream.
℃ for 5 hours with stirring, NCO
A 2.3% viscous transparent liquid prepolymer was obtained.

A Component Γ Polypropylene glycol (MW4700, triol) 100 parts by weight Γ 2.4/2.6:80/20 tolylene diisocyanate
11 Next, the following compounds of component B were mixed and stirred using a planetary mixer (manufactured by Inoue Seisakusho) for about 1 hour to obtain a transparent liquid.

B Component Γ Polypropylene glycol (MW4700, triol) 100 parts by weight Γ Dibutyltin dilaurate 1.2 〃 Γ Silicone oil (trademark: Silicone Oil L-45, Nippon Unica Co., Ltd.) 2.0 〃 Component A and B obtained by the above method As a result of mixing A component: B component = 1:0.7 (weight ratio),
A composition with a pot life of 1 hour and a curing time of 3 hours was obtained. The cured product of this composition has a hardness of 27 (JIS
K630l, type A hardness tester).

Example 3 On the outer wall of an apartment building where mortar was applied with acrylic lysine spraying material, the width was 0.3 to 0.6 mm and the depth was 30 mm.
Repair work was carried out on an area where a ~80mm crack had occurred in an area of 2m wide and 3m high.

The repair method was the same as in Example 1, except that the composition shown in (e) below was used as the plug fixing composition, and the composition shown in (f) below was used as the coating film forming composition.

When the paint film and plug were removed after the resin had hardened, there was no leakage of the epoxy resin and no damage to the wall surface.

(e) Plug fixing composition A Component Γ Bisphenol A-based 74 parts by weight epoxy resin ^* Γ 2-ethylhexyl glycidyl ether ^**
7.4 〃 Γ Short fiber asbestos 3.8 〃 Γ Silica (325 mesh) 9.8 〃 Γ Stearic acid 5.0 〃 *Trademark: Epicote 828, manufactured by Ciel Chemical **Trademark: Calidria Asbestos RG-144, manufactured by Union Carbide B Component Γ Polyamide resin ^* 37 parts by weight Γ 2,4,6 Tris (dimethylaminomethyl)
Phenol 3〃 *Trademark: Tomide 245, Fuji Kasei amino value 400
1500 to 3000 cps (25℃) The above A component and B component are stirred and kneaded separately in a planetary mixer until uniform, and then mixed so that A component/B component = 100/40 (weight ratio). Knead to give a pot life of 15 minutes and a curing time of 15 minutes.
The composition was obtained in 30 minutes. The hardness of the cured product of this composition was 75 (JIS K7215 durometer D hardness).

(f) Coating composition A Component Γ Bisphenol A epoxy resin ^* 80 parts by weight Γ 2-ethylhexyl glycidyl ether
10 〃 Γ Stearic acid 10 〃 *Trademark: Epicote 828, manufactured by Shell Chemical The above A component was heated to 100℃ while mixing using a planetary mixer, immediately cooled to room temperature, and mixed until homogeneous to make a pale A yellow translucent paste was obtained.

B Component Γ Polyamide resin ^* 40 parts by weight Γ 2,4,6 Tris (dimethylaminomethyl)
Phenol 3 〃 *Trademark: Tomide 245, manufactured by Fuji Kasei After uniformly mixing the above B component with a planetary mixer, the result was uniformly kneaded at a mixing ratio of A component/B component = 100/43 (weight ratio). pot life 13 minutes,
A composition with a curing time of 25 minutes was obtained. The hardness of the cured product of this composition was 70 (JIS K7215 durometer D hardness).

Example 4 Repair work was carried out on the exterior wall of a store with mortar coated with acrylic ricin spray material, where cracks measuring 0.5 to 0.7 mm in width and 50 to 85 mm in depth had occurred in an area of 2.5 m in width and 4 m in height. Ta. The repair method was the same as in Example 1, except that the composition shown in (g) below was used as the fixing composition, and the composition shown in (h) below was used as the coating film forming composition.

When the paint film and plug were removed after the resin had hardened, there was no leakage of the epoxy resin and no damage to the wall surface.

(g) Plug fixing composition Γ Unsaturated polyester resin ^* 60 parts by weight Γ Styrene monomer 25 〃 Γ Hydrogenated castor oil 8 〃 Γ Stearic acid 5 〃 Γ Cobalt naphthenate (contains 6% cobalt)
2 〃 Γ Heavy calcium carbonate 50 〃 * A mixture of propylene glycol/maleic anhydride/phthalic anhydride = 1.1/0.5/0.5 (molar ratio) was heated and stirred stepwise from 80 to 200°C in an inert gas atmosphere. Using a planetary mixer, the unsaturated polyester resin obtained by dehydrating the above composition,
After stirring at 80°C until uniform, the mixture was cooled to room temperature to obtain a pale yellow paste. Methyl ethyl ketone peroxide per 100 parts by weight of this composition.
As a result of adding 1.0 part by weight and uniformly kneading, a composition with a curing time of about 20 minutes was obtained. The hardness of this composition was 78 (JIS K7215 durometer D hardness).

(h) Paint film forming composition Γ Unsaturated polyester resin (same as (g))
70 parts by weight Γ Styrene monomer 20 〃 Γ Cobalt naphthenate (contains 6% cobalt)
1.5 〃 Γ Stearic acid 15 〃 The above composition was mixed using a planetary mixer,
The mixture was stirred and mixed at 80°C until uniform, and cooled to room temperature to obtain a pale yellow translucent paste. This composition
As a result of mixing 0.7 parts by weight of methyl ethyl ketone peroxide with 100 parts by weight and kneading the mixture uniformly, a composition having a curing time of about 30 minutes was obtained. The hardness of this composition is 75 (JIS K7215 durometer D hardness)
It was hot.

[Brief explanation of drawings]

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 tube, 5 is a nozzle of a synthetic resin case, 6 is a wall surface, 7 is a mounting washer, 8 is a crack, 9 10 is a wall surface, 10 is a coating film made of strippable paint, 11 is a crack, 12 is a gap, 13 is a plug, 14 is an adhesive, and 15 is a grease pump.

Claims (1)

[Scope of Claims] 1 a. A polyurethane resin composition containing an isocyanate group-containing compound, a hydroxyl group-containing compound, a curing accelerator, and a release agent; b. An epoxy resin composition containing an epoxy resin, a curing agent, and a release agent. products, and c unsaturated polyester resins, vinyl monomers,
A releasable resin composition selected from unsaturated polyester resin compositions containing a curing accelerator, a catalyst, and a releasability imparting agent is applied to cracks and/or voids to form a coating film, and then used for repair. A wall repair method characterized by injecting resin. 2 a. A polyurethane resin composition containing an isocyanate group-containing compound, a hydroxyl group-containing compound, a curing accelerator, and a releasability imparting agent, b. An epoxy resin composition containing an epoxy resin, a curing agent, and a releasability imparting agent, and c. Unsaturated. polyester resin, vinyl monomer,
A peelable resin composition selected from unsaturated polyester resin compositions containing a curing accelerator, a catalyst, and a peelability imparting agent is applied to cracks and/or voids to form a coating film, and the composition is applied. A method for repairing a wall surface, which comprises fixing a repair resin injection device to a wall surface using the composition before or after coating, and injecting the repair resin after forming a coating film.