JPS62297379A - Grouting process - Google Patents

Abstract

PURPOSE:To enable the repairing and reinforcement of cracked or floating part of concrete, mortar, etc., under low toxic condition in high workability, by injecting a one-pack type epoxy resin injection agent containing a specific ketimine.enamine compound. CONSTITUTION:A one-pack type epoxy resin injection agent is produced by compounding (A) a ketimine.enamine compound produced by the dehydrative condensation of (i) an amine compound having >=2 primary and/or secondary amino groups (e.g. 1,8-p-menthanediamine) and (ii) a carbonyl compound (e.g. isobutylaldehyde) to (B) an epoxy resin (e.g. glycidyl ether-type epoxy resin). The injection agent is injected into a cracked or floating part of concrete or mortar, etc., preferably under pressure by automatic injector to effect the repairing and reinforcement of the defects. The amount of the active hydrogen of the component A is preferably 0.5-2.1 equivalent based on 1 equivalent of the epoxy group of the component B.

Description

[Detailed Description of the Invention] 3. Detailed Description of the Invention The present invention relates to an injection method, more specifically, to concrete or mortar for buildings or structures, etc. JLJ III
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--14M -j-2ff1F /k Iv- A construction method for repairing or reinforcing soft soil by injecting an injection agent, which is a one-liquid solution that has good storage stability and can harden under floating rocks of moisture or steam. By using an epoxy resin-based injection agent, this injection method poses fewer health and safety problems for the human body.

Defects in cracks or floating parts of this type of concrete or mortar pose a risk of secondary disasters such as becoming a route for rainwater to infiltrate or falling off. Measures are being taken to repair the problem by injecting a filler.

However, since heat for curing cannot be applied to these injection points, or even if it is attempted, it is extremely difficult, two-component room-temperature curing injection agents, such as King Agent, are usually used. A two-component injection agent that combines an epoxy resin with an amine compound as a curing agent is often used. However, when blending for use, there are physical problems such as poor curing due to quantitative errors, poor pourability due to variations in pot life due to temperature changes at the work site, and furthermore, amine compounds cause rashes on workers. It is viewed as a health problem for the human body, such as skin disorders and toxicity.

In view of these problems, the inventors of the present invention have repeatedly investigated the possibility of a one-component injection agent that is stable and does not have an adverse effect on the human body as an alternative to the two-component type, which has performance problems. Ketimine/enamine compounds obtained on a compound dehydration stage undergo hydrolysis in the presence of moisture or steam to regenerate the original amine compound, which causes a curing reaction with epoxy resin. The present inventors have discovered that if the above ketimine/enamine compound is blended with the ketimine/enamine compound, it can be used as a moisture-curable one-component epoxy resin injection agent, and have completed the present invention.

That is, the present invention provides a method for repairing cracks or floating parts of concrete or mortar by injecting a filler, in which an amine compound having two or more of 7 groups of 5th class and/or 2nd class amines and a carbonyl The present invention provides an injection method characterized by using a one-component epoxy resin injection agent containing a ketimine/enamine compound obtained by dehydration with a compound.

The one-component epoxy resin injection agent used in the present invention is made by blending ketimine/enamine compounds with epoxy resin in the absence of moisture, and further adding ordinary fillers, quenching agents, adhesion promoters, anti-aging agents, etc. as necessary. It consists of a system containing additives, pigments, ultraviolet absorbers, etc.

The above epoxy resin may be any ordinary one,
For example, a reaction product of polyhydric phenol and epichlorohydrin (e.g. diglycidyl ether of bisphenol)
, reaction products of alkylene oxide adducts of polyhydric phenols and epichlorohydrin (e.g. diglycidyl ether of ethylene oxide and optionally propylene oxide adducts of bisphenols), reaction products of aliphatic polyhydric alcohols and epichlorohydrin (e.g. glycerin triglycidyl ether, diglycidyl ether of 1,6-benzenediol), hydrogenated products of the reaction product of polyhydric phenol or its alkylene oxide adduct with epichlorohydrin (e.g., hydrogenated (polyglycidyl ether of suphenol), etc. glycidyl ether type, glycidyl ester type such as phthalic acid diglycidyl ester, hexahydrophthalic acid diglycidyl ester, tetrahydrophthalic acid diglycidyl ester, other glycidyl amine type, linear aliphatic epoxide type, alicyclic epoxide type, etc. One type or a mixture of two or more of these can be used.Glycidyl ether type liquid types are particularly preferred.

The above ketimine/enamine compound is obtained by dehydrating an amine compound having two or more primary and/or 42nd amino groups and a carbonyl compound.

Examples of the above amine compounds include monoethylamine, diethyleneamine, propylamine, monomethylaminopropylamine, dimethylaminopropylamine, diethylaminopropylamine-2-alkoxypropylamine, Aliphatic amines such as bilamin, allylamine, diaminodiphenyl ether, dicyclohexylamine, dibenzylamine,
P-aminobenzoic acid, aromatic amines such as xylylenediamine, 1,8-p-menthanediamine, inphoronediamine, diaminocyclohexane, 4.4-methylenebis(cyclosequidylamine), 1, 3-bis(
(aminomethyl) cyclohexane, 3-aminomethyl-3
, 3,5-) Limethylcyclohexylamine and other alicyclic amines, as well as amine compounds containing alkoxysilyl groups (aminoalkoxysilanes) (
N-(β-aminoethyl)aminomethyltrimethoxysilane, γ-aminopropyltriethoxysilane, γ-aminopropylmethyljethoxysilane, N-(β-aminoethyl)-γ-aminopropyltriethoxysilane,
N-(β-aminoethyl)-γ-aminopropyldimethoxysilane, etc.] and an excess amount of the aminoalkoxysilane and epoxyalkoxysilane [γ-glyredoxypropyldimethylethoxysilane, γ-glycidoxypropylmethyl reaction with jetoxysilane, γ-glycidoxypropyltrimethoxysilane, β-(3,4-epoxycyclohexyl)ethyltrimethoxysilane, β-(3゜4-epoxycyclohexyl)ethylmethyldimethoxysilane, etc.) Examples include reaction products of aminoalkoxysilanes and the above-mentioned epoxy resins, polyamide resins, polyalkyl ether amines, etc., and one or a mixture of two or more of these may be used.

Examples of the carbonyl compound include acetaldehyde, propionaldehyde, n-butyraldehyde,
Aldehydes such as isobutyraldehyde, diethylacetaldehyde, glyoxal, benzaldehyde,
Cyclic ketones such as cyclopentanone, trimethylcyclopentanone, cyclohexanone, and trimethylcyclohexanone; aliphatic ketones such as acetone, methyl ethyl ketone, methyl propyl ketone, methyl isopropyl ketone, methyl isobutyl ketone, diisopropyl ketone, dibutyl ketone, and diisobutyl ketone. , and the formula 2R -GO-CH! -GO-it [wherein K and R2 are the same or different and each has an alkyl group of 1 to 16 carbon atoms (for example, methyl, ethyl, propyl, butyl, heptyl, hexyl, octyl,
nonyl, decyl, undecyl, hexadecyl), aryl groups having 6 to 12 carbon atoms (e.g. phenyl, tolyl,
(hexyl, naphthyl, etc.) or an alkoxy group having 1 to 4 carbon atoms (such as methoxy, ethoxy, propoxy, butoxy, etc.) f) and dimethyl malonate, diethyl malonate, methylethyl malonate, dibenzoylmethane, etc., and one or a mixture of two or more of these may be used.

The dehydration condensation of the above-mentioned amine compound and carbonyl compound can be carried out under the same conditions as the usual dehydration of an amine and an aldehyde or ketone. For example, it is carried out under floating stones of a water-absorbing agent or while distilling water off under heated distant current. It will be done. More specifically, a carbonyl compound in a stoichiometrically equivalent or excessive amount of the amine compound (however, in the case of a β-dicarbonyl compound, one of the two keto groups is reacted) is added to toluene,
In a suitable organic solvent such as xylene or benzene, a water absorbing agent such as a molecular sieve or anhydrous magnesium sulfate is added, and the mixture is reacted at room temperature or under heating with stirring. The blending amount of the ketimine/enamine compound obtained in this way is 0.5 to 0.5 to 1 equivalent of the epoxy group of the epoxy resin as the main ingredient in the active water system of the ketimine/enamine compound.
What is necessary is just to select so that it may become 2.1 equivalent, preferably 0.7-1.6 equivalent.

The injection method according to the present invention is characterized by using the above-mentioned one-component epoxy resin injection agent, and the operation of the method can be carried out according to a conventional method. A section is provided, and the injection agent is injected into this section using a grease gun. As another method, it is desirable to employ a method in which the injection agent is automatically injected under pressure. Moreover, the injection method of the present invention can also be used for reinforcement of soft ground, such as earth failure.

Next, the present invention will be explained in more detail with reference to Examples.

Example 1 A mixture of 30 μl of 1,8-P-menthanediamine, 5 μl of isobutyraldehyde, and 50 μl of benzene is refluxed to perform dehydration, and after 8 hours, a predetermined amount of water is removed. The reaction product is depressurized. After distillation, ketimine/enamine compound 4gy is obtained.

The above ketimine/enamine compound 3 (l) and glycidyl ether type epoxy resin (manufactured by Shell Chemical Co., Ltd.).

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When this was stored in a sealed container at 40°C, no changes such as thickening were observed even after one month. There wasn't. Further, when placed in air humidity, amine was generated by hydrolysis of the ketimine/enamine compound, which caused a curing reaction with the epoxy resin to form an attractive cured product.

Claims (1)

[Claims] 1. In a method of repairing cracks or floating parts of concrete or mortar by injecting a filler,
An injection method characterized by using a one-component epoxy resin injection agent containing a ketimine/enamine compound obtained by dehydration condensation of an amine compound having two or more primary and/or secondary amino groups and a carbonyl compound. . 2. In the case of a one-component epoxy resin injection agent, the above-mentioned first method includes blending the ketimine/enamine compound in an amount of 0.5 to 2.1 equivalents of active hydrogen per equivalent of the epoxy group of the epoxy resin. Injection method described in section.