JP2753984B2 - Crack repair method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for repairing a crack by sealing the surface of the crack and attaching a washer for fixing a repair resin injector at intervals and injecting a resin from an injection port.

[0002]

2. Description of the Related Art This type of repair method is used for repairing cracks generated in structures such as concrete, stones, tiles, etc., and is applied to an injection washer fixed on an injection port with an adhesive. A resin injecting tool is attached to inject the resin into the crack, and after the resin is cured, the washer and the sealant are removed (see Japanese Patent Publication Nos. 61-56378 and 63-8154). Epoxy resin, urethane resin, hot-melt resin, etc. are used as the adhesive and sealant for the injection washer so that they have adhesive strength to withstand the injection pressure of the resin, but after the injection resin is cured The removal work to be performed becomes difficult and may damage the wall surface and its surface coating, so that there is an inconvenience that the repair work must be performed.

In order to solve this inconvenience, the sealant or the washer adhesive has a sufficient adhesive force to resist the injection pressure of the resin received in a direction perpendicular to the surface, and at the same time, after the injected resin is cured. At the time of peeling, it is required that the adhesive force of the sealant or the adhesive film in the peeling direction be reduced so that the film can be easily peeled. In recent years, so-called strippable paints with extremely good releasability, such as vinyl acetate, polyvinyl alcohol, styrene-butadiene-styrene-based thermoplastic rubber, and styrene-isoprene-styrene-based thermoplastic rubber, are used as sealants. Post-processing can be greatly simplified (Japanese Patent Publication No. 48-27415).
No., Japanese Patent Publication No. 5-10467 and Japanese Patent Publication No. 7-11195). However, although these sealants are suitable for covering the surface of the crack, the adhesive layer of the washer fixed to the crack surface directly receives the pressure applied when the resin is injected. If resin is used, resin leakage will occur. for that reason,
Epoxy resin or urethane resin must be used for the fixing portion of the washer, and this portion has to be reworked as before. In the case of the rubber-based strippable paint, the solvent is 40 to 60%.
It is of a so-called solvent type that also contains, and there is a problem in the working environment such as the need to pay attention to fire.

[0004]

The present invention relates to a method for repairing a crack by applying a seal to a surface of a crack and attaching a washer for fixing a repair resin injector at intervals and injecting a resin from an injection port to fix the crack. It is an object of the present invention to make it possible to easily peel off an adhesive to be used.

[0005]

Technical means for solving this technical problem is to form a coating film of a polyalkylene ether compound having a hydrolyzable silicon functional group at a molecular chain terminal and capable of crosslinking by forming a siloxane bond. Fixing the washer with a one-component moisture-curable adhesive as a polymer.

An adhesive using this composition as a film-forming polymer has a strong resistance to a pressure applied in a direction perpendicular to the film surface, so that a sufficient adhesive force with a crack surface can be obtained, and at the same time, an appropriate flexibility is obtained. When the film is peeled off, the coating film is stronger than the adhesive force to the cracked surface and can be peeled off without being damaged. In addition, since application or application can be easily performed using a cartridge, an extruded tube, a spatula, or the like, construction is also easy. Therefore, it can also be used as a sealant for crack surfaces.

The polyalkylene ether compound of the present invention (hereinafter referred to as component (a)) is called a so-called modified silicone polymer. As a preferred specific example, for example, a hydrolyzable silicon functional group represented by the following formula has a molecular chain. Examples thereof include a polyalkylene ether having a terminal.

[0008]

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In the above formula, R ¹ is a monovalent hydrocarbon group having 1 to 12 carbon atoms selected from an alkyl group and a phenyl group, and X is a hydride group, a halogen atom, an alkoxy group, an acyloxy group, a ketoximate group, an alkenyl group. Oxy group, amide group, acid amide group, isopropenoxy group,
A is 0, 1 or 2, R ² is hydrogen or a group having 1 to 1 carbon atoms, selected from an oxime group, an aminoxy group and a mercapto group;
20 is a monovalent organic group, R ³ is a divalent organic group having 1 to 20 carbon atoms, and b is 0 or 1.

The hydrolyzable group bonded to the silicon atom is preferably an alkoxy group, and more preferably a methoxy group from the viewpoint of curability. The main chain of the polyalkylene ether component (a) consists essentially of -R ^{4 -O-} (R 4 is a divalent alkyl group) chemically bonded repeating unit represented by. These repeating units may be bonded not only by one kind but also in a form in which two or more kinds of units are mixed. Polyether produced using propylene oxide as a raw material and having a main chain (polypropylene ether) has a high molecular weight but is liquid at ordinary temperature. Therefore, it is preferable to use polypropylene ether as the polyalkylene ether of the present invention. Can be. The molecular weight of the polyalkylene ether used as the component (a) is about 1,000 to 30,000.
0, but preferably from about 5,000 to 2
The range of 0000 is good. When the molecular weight is less than about 1,000, the obtained cured product has poor flexibility, and conversely, about 30,
If it exceeds 000, the viscosity of the composition will increase and the workability will decrease. In the present invention, the polyalkylene ethers are used alone or as a mixture of two or more.

The adhesive is usually used as a composition in which a filler and a curing catalyst are blended with the component (a). As the filler, conventionally known fillers can be widely used, for example, reinforcing fillers such as fumed silica, precipitated silica, silicic anhydride, hydrous silicic acid, and carbon black; calcium carbonate, magnesium carbonate, diatomaceous earth, calcined clay Fillers such as clay, talc, titanium oxide, benite, organic benite, ferric oxide, zinc oxide, activated zinc white, and shirasu balloon; fibrous fillers such as asbestos, glass fiber, and filaments; Mix and use two or more. The amount of the filler is usually 5 to 300 parts by weight, preferably 50 to 20 parts by weight, per 100 parts by weight of the component (a).
The range is 0 parts by weight. If the amount is too small, the reinforcing effect becomes insufficient, and if it is too large, the viscosity of the composition increases and the workability decreases.

The curing catalyst is a catalyst for curing the component (a) into a solid having rubber-like elasticity, and a conventionally known silanol curing catalyst can be used. Examples of the curing catalyst include tetrabutyl titanate and tetrapropyl titanate. Titanates; tin carboxylate salts such as dibutyltin dilaurate, dibutyltin maleate, dibutyltin diacetate, tin octylate, tin naphthenate, tin laurate, and tin ferzatic acid; reaction products of dibutyltin oxide and phthalate; dibutyltin Diacetylacetonate; organoaluminum compounds such as aluminum trisacetylacetonate, aluminum trisethylacetoacetate, diisopropoxyaluminum ethylacetoacetate; zirconium tetraacetylacetate Chelate compounds such as nato and titanium tetraacetylacetonate; lead octylate; iron naphthenate; dismuth compounds such as bismuth-tris (neodecanoate) and bismuth-tris (2-ethylhexoate); butylamine, octylamine, lauryl Amine, dibutylamine, monoethanolamine, diethanolamine, triethanolamine, diethylenetriamine, triethylenetetraamine, oleylamine, cyclohexylamine, benzylamine, diethylaminopropylamine, xylylenediamine, triethylenediamine, oleylamine, cyclohexylamine, benzylamine, diethylamino Propylamine, xylylenediamine, triethylenediamine, guanidine, diphenylguanidine, 2,4,6-to Scan (dimethylaminomethyl) phenol, morpholine, N- methylmorpholine, 2-ethyl-4-methylimidazole, 1,8
Diazabicyclo (5,4,0) undecene-7 (DB
Amine compounds such as U); salts of these amine compounds with carboxylic acids and the like; low molecular weight polyamide resins obtained from excess polyamines and polybasic acids; reaction products of excess polyamines with epoxy compounds; A known acidic catalyst or basic catalyst as a silanol condensation catalyst can be used alone or as a mixture of two or more. The curing catalyst is generally used in an amount of 0.1 parts by weight per 100 parts by weight of the component (a).
The range is from 10 to 10 parts by weight, preferably from 0.1 to 5 parts by weight. If the amount of the curing catalyst is too small, the curing becomes insufficient. If the amount is too large, problems such as bleeding of the surface of the cured product occur.

Further, in order to enhance the workability of the adhesive, the adhesive can be diluted by adding a plasticizer or a solvent. As the plasticizer, di- (2-ethylhexyl) phthalate, di-
phthalic acid esters such as n-octyl phthalate, diheptyl phthalate, diisodecyl phthalate, butylbenzyl phthalate, diisononyl phthalate; di- (2-
Ethylhexyl) adipates such as adipate and diisodecyl agitate; glycol derivatives such as polyethylene glycol and benzoate; paraffin derivatives such as basic paraffin; epoxy derivatives such as epoxidized soybean oil; and polyester plasticizers such as adipic polyester. can do. The amount of these plasticizers to be added must be 10 parts by weight or less based on 100 parts by weight of the component (a) in order to prevent contamination by mortar penetration. As the solvent, acetone, methyl ethyl ketone, methyl isobutyl ketone, methyl acetate,
Examples include ethyl acetate, butyl acetate, n-hexane, cyclohexane, benzene, toluene, xylene and the like. It is desirable to keep the amount of these solvents added to less than 5% of the total amount of the adhesive in order to prevent the working environment from deteriorating.

The adhesive used in the present invention may be a thixotropic agent (anti-sagging agent) such as ultra-fine powder silica or organic wax, or a dehydrating agent such as alkyl orthoformate or vinyl silane, depending on the purpose of the above additive. , An epoxy resin, a phenol resin, an aminosilane or the like.

[0015]

As a result, the adhesive for fixing the washer can be easily peeled off. As a result, the processing after the injection resin is cured without damage to the crack surface can be extremely simplified, and particularly, a structure having a painted surface or a tile surface. Suitable for repairing. If the adhesive is also used to seal the crack surface, the work efficiency is extremely high because the washer can be bonded and the crack surface can be sealed with the same material, and there is also an advantage that the peeling operation can be performed integrally. .

[0016]

EXAMPLES As shown in Production Example 1 in Table 1, <MS-
S303> 100 parts, <White gloss flower CC-R> 50 parts,
<NS # 400> 100 parts, <Dispalon # 6500
> 3 parts are added, and the mixture is stirred under heating and vacuum using a planetary mixer, and is subjected to a dehydration treatment until the water content of the composition becomes 500 ppm or less. Then, the mixture was cooled to 40 ° C., and as a dehydrating agent, 1.5 parts of <Sarayace S-210>, 12 parts of xylene, and <No. 918> 2 copies and <Farmin 2
0D> 1 part was vacuum-stirred and mixed to produce a one-part moisture-curable adhesive. The adhesives of Production Examples 2 to 4 were produced by the same production method, and an injection pressure test and a peel test were respectively performed.

[0017]

[Table-1]

(Injection pressure test)
・ A 6 washer made of nylon is adhered to a crack-free concrete pavement plate (see JIS 3104) and a porcelain tile surface. H. 2 under the condition of 60 ± 5%
After curing for 4 hours, an injector was attached to the washer under the following injection conditions, and an injection pressure test was performed. Injection agent: Epoxy resin adhesive Injection pressure: 1.5 kg / cm ² Pressurization time: 3 hr Test temperature: 20 ° C. No leak occurred on both the pavement plate and the porcelain tile surface in any of the samples. Sufficient adhesive strength was demonstrated.

[0019]

[Table-2]

(Peeling Test) Next, the adhesives of Production Examples 1 to 4 were applied on an asbestos board and a porcelain tile to a width of 30 mm and a thickness of 3 mm.
After applying for 180 mm and leaving it to stand at room temperature for 7 days, a 180 ° peel test was carried out. As a result, the peel adhesive strength shown in Table 2 was obtained, and all of them could be easily peeled by hand. In addition, a cured physical property test of the adhesive measured at the same time (JIS K6)
As is clear from the data of (301), the material had tough and elastic physical properties, and the peeling operation could be easily performed.
This test result shows that even after considerable time has elapsed after the injection of the resin into the cracks, the peeling is easy,
This means that even if a large number of days are required for the pouring operation itself in a large and complicated construction site, the peeling operation itself is not affected.

Continuation of the front page (56) References JP-B Hei 5-10467 (JP, B2) JP-B 48-27415 (JP, B1) JP-B 61-56378 (JP, B2) JP-B 63-8154 (JP , B2) Tokiko 7-11195 (JP, B2)

Claims (3)

(57) [Claims] 1. A method for repairing a crack by applying a seal to a surface of the crack and attaching a washer for fixing a repair resin injector at an interval and injecting resin from an inlet.
A crack repair method in which a washer is fixed with a one-pack moisture-curable adhesive using a polyalkylene ether compound having a hydrolyzable silicon functional group at a molecular chain terminal and capable of crosslinking by forming a siloxane bond to form a coating film forming polymer. 2. The adhesive according to claim 1, wherein the main chain of the polyalkylene ether compound is polypropylene ether. 3. A crack repair method for sealing a crack surface with the one-component moisture-curable adhesive according to claim 1.