KR100594508B1 - Reinforcing methods using as silane modified epoxy composition for underwater structure - Google Patents

Abstract

The present invention relates to a silane-modified epoxy composition for repairing underwater structures, and a repairing method using the same. More specifically, the present invention relates to an adhesive force using glass fiber, carbon fiber, or aramid fiber as a reinforcing material, or injected into a deteriorated damage part of an underwater structure. The present invention relates to a reinforcing reinforcement composition and a reinforcing reinforcing method that can be sufficiently maintained. In the present invention, bisphenol A epoxy resin 25 to 50% by weight, bisphenol F epoxy resin 3 to 20% by weight, silane-modified acrylic polymer compound 5 to 20% by weight, aliphatic difunctional reactive diluent 1 to 15% by weight, inorganic filler 10 to 30 1 to 10% by weight of polyamide amine type curing agent, 10 to 40% by weight of modified aliphatic polyamine, 30 to 70% by weight of modified alicyclic amine, and 5 to 100 parts by weight of aminosilane compound (A) Underwater and wetland civil engineering, building structures using the silane-modified epoxy composition for reinforcement of underwater structures, characterized in that using 40 to 70 parts by weight of a curing agent (B) containing 30% by weight, 1-7% by weight of nonylphenol An underwater curing type silane-modified epoxy composition having improved adhesion for repair reinforcement and a repair reinforcement method using the same are provided.

Repair, reinforcement, concrete, epoxy, silane modified acrylic polymer, aminosilane

Description

Reinforcing methods using as silane modified epoxy composition for underwater structure

The present invention relates to a silane-modified epoxy composition for repairing and reinforcing aquatic structures, and to a repair and reinforcing method for architectural and civil engineering structures present in water, and more particularly, to glass fiber, carbon fiber or The present invention relates to a repair reinforcement method that uses aramid fibers to attach a epoxy resin modified with a silane compound to a surface of a structure to be repaired and restores the strength of the lowered structure.

Repair and reinforcement methods using fibers such as carbon, glass, and aramid on deteriorated or corroded structures not only enhance the damaged strength of existing structures, but also protect the surface of the structure to prevent further deterioration. to provide. At this time, in order for the existing concrete and steel structures and the reinforced fibers to exhibit the same behavior, an adhesive that bonds the reinforcing fibers and the attachment surface is important. In this case, epoxy resin is mainly used as a material of the most widely used adhesive, but in general, epoxy resin is unable to develop adhesion and strength between the target structure and reinforcing fibers in water.

The repair reinforcement of the present invention is used for repair reinforcement using fibers, coating of concrete and steel pile (pile), attaching pile fiber, crack injection by underwater pressure injection, etc., epoxy coating agent, grouting agent, patching agent Repair reinforcement materials, such as primers and impregnants for fiber attachment, do not separate material in water so that the concrete structure damaged in wet surface or water can be completely reinforcement and efficient maintenance.

In recent years, in civil engineering of reinforced concrete and building structures, various deterioration phenomena such as peeling, peeling, abnormal cracking, etc. of concrete result in the reduction of compressive strength of concrete and tensile strength due to corrosion of reinforcing steel. Furthermore, problems of safety accidents such as collapse and damage of structures due to corrosion of steel in reinforced concrete structures have been reported in newspapers and on TVs, and are emerging as social problems.

The deterioration factor and deterioration factor of the concrete is that the concrete has a strong alkalinity (pH = 12.5), so that the corrosion of the reinforcing bar does not proceed, but carbon dioxide, acid, chloride, infiltration, alkali aggregate reaction, and weather conditions ( Expansion / contraction and rainwater invasion), the neutralization of the concrete proceeds, the corrosion of the reinforcing steel progresses, the cracks in the concrete occur due to the expansion of rust, and the reinforced concrete structure is damaged by peeling and peeling, which leads to the collapse of the structure. Will be.

In addition, as the structures of concrete including various civil and building structures are neutralized by the infiltration of carbon dioxide and acid rain, the phenomenon that the load capacity of the structure is lowered due to the cracking of the concrete and the corrosion of the steel is not only infiltrated with carbon dioxide but also mixed with concrete. Gravel and sand are known to accelerate in the neutralization of concrete in the case of volcanic rock.

In particular, when reinforcing and reinforcing bridges and pier wells and underground buildings under wet conditions, the repair and reinforcement parts are repaired by peeling and dropping. There are many problems that the reinforcement capacity is lost, and in the case of the pier flows more water is a big problem that is easily lost by the flow rate of the reinforcing reinforcement.

In general, underwater concrete structures, such as deterioration of the material due to scour, erosion, ship collision due to the sea water, peeling, dropping phenomenon occurs. Conventionally, repairs have been carried out with general mortar, concrete, and epoxy resin.

However, when the above construction materials are used, the reinforcing stiffeners are peeled off or dropped because they are not integrated with existing concrete and have poor adhesion to wet or wet places and harden in a relaxed state after construction due to the difference in coefficient of thermal expansion. The phenomenon occurred and the reinforcing effect was very weak.

In the case of Korea Patent Publication 2001-0104120, a mixture of metallic pillars or inert inorganic powders is applied to fill and repair for the urgent cracks of civil and architectural structures to be provided for repair, molding sealing and circular restoration. The repair composition using a poly mercaptane cured epoxy resin composed of a mixed composition is specified, but application and attachment to concrete surfaces in water are not mentioned.

Korean Patent 2006-0009412 relates to a composition of a two-component epoxy paint for curing in water and a method for preparing the same, wherein a bisphenol A epoxy resin, a modified petroleum resin, a swelling dispersant, a sieving pigment, and a coloring pigment have a modified epoxy resin in an appropriate blending ratio. Isophorone diamine (IPDA), norbornenediamine (NBDA), benzyl alcohol and bisphenol A epoxy resin is a two-component epoxy paint composition for curing water and a method for producing the same mixed with an amine curing agent composed of a suitable ratio. . However, when the concrete structure or steel structure existing in the water is damaged, there is a limit to repair because it is not a method of directly reinforcing the structure in the water.

Therefore, in the present invention, it is not integrated with the existing structure, the adhesion to the wet place or the damage in the water is weak, and due to the difference in thermal expansion coefficient is hardened in the relaxed state after construction, so that the reinforcing reinforcement material peels off, dropping occurs, the repair reinforcement effect is In order to solve the weak problem, the reinforcing and reinforcing of the underwater structure with a new composition based on epoxy resin to give high strength and high strength to the surface to be reinforced and the reinforcing material so as not to separate the material from the wet surface or the water. The purpose of the present invention is to provide a composition for reinforcement, which is directly applied to the reinforcement surface in water, injected into a damaged part such as a crack, or impregnated in a fiber material to be directly attached to the reinforcement structure in various ways. To provide a way to reinforce this possible structure Shall be.

The present invention relates to a silane-modified epoxy composition for repairing underwater structures and a repairing method using the same. More particularly, the present invention relates to an injured or damaged portion of an underwater structure or impregnated with glass fiber, carbon fiber or aramid fiber as a reinforcing material. The present invention relates to a reinforcing reinforcing material composition and a reinforcing reinforcing method so as to sufficiently maintain adhesive strength.

The present inventors add a silane-modified epoxy compound to the bisphenol A and bisphenol F epoxy compositions, adjust the viscosity with an aliphatic difunctional epoxy reactive diluent, and increase the tensile strength after curing in water when the aminosilane is added to a certain amount of the curing agent. The present invention was completed by finding out.

Epoxy composition that can be adhered to concrete and steel surface and reinforcement in water should proceed smoothly even at low temperature, and should have sufficient pot life when mixed with epoxy resin's main agent and hardener on the ground. It should be possible to work underwater by maintaining it and be able to apply it to concrete and steel surface without being immersed in water.

The present invention to satisfy this bisphenol A epoxy resin 25 to 50% by weight, bisphenol F epoxy resin 3 to 20% by weight, silane-modified acrylic polymer compound 5 to 20% by weight, aliphatic difunctional reactive diluent 1 to 15% by weight, inorganic filler 1 to 10% by weight of polyamide amine-type curing agent, 10 to 40% by weight of modified aliphatic polyamine, 30 to 70% by weight of modified alicyclic amine, aminosilane The present invention relates to a silane-modified epoxy composition for reinforcing underwater concrete structures, comprising 40 to 70 parts by weight of a curing agent (B) comprising 5 to 30% by weight of a compound and 1 to 7% by weight of nonylphenol.

Hereinafter, the present invention will be described in detail. The roles of each component of the subject are as follows.

First, the component which comprises an epoxy theme (A) is demonstrated.

In the present invention, the epoxy resin is bisphenol A epoxy resin and bisphenol F epoxy resin, bisphenol A epoxy resin can be used in general bisphenol A type products, 25 to 50% by weight, bisphenol F epoxy resin It is also possible to use general generalized products, it is preferable to use in the range of 3 to 20% by weight.

Bisphenol A epoxy resin plays a role of expressing the adhesive strength and strength of the cured epoxy composition with concrete or steel structures. When less than 25% by weight, bisphenol A epoxy resin exhibits a problem of low adhesion and strength. When the epoxy composition is condensed in water, when it is applied to concrete or steel structure, the surface is agglomerated and the workability is significantly decreased.

 Bisphenol F epoxy resin is used for the purpose of supplementing the properties of bisphenol A epoxy resin, and the epoxy composition in water plays a role of smoothing the coating on concrete or steel structures. If the content of the bisphenol F-type epoxy composition is less than 3% by weight, the phenomenon of shrinkage and condensation of the epoxy composition in water is remarkably high, resulting in poor workability, and when more than 20% by weight is used, the adhesion to concrete structures or steel structures is low. It is preferable to use it within the above content range because it exhibits a problem.

In the present invention, the silane-modified acrylic polymer compound is used to increase adhesion with concrete in water, and an epoxy reactive diluent and tetraethoxysilane containing two or more epoxy functional groups such as neopentyl glycol diglycidyl ether. Any one or more selected from alkylsilanes such as (TEOS) and tetramethoxysilane (TMOS) may be selected as a solvent, and such solvent mixture 20 to 40% by weight, methyl methacrylate 20 to 60% by weight, butyl acrylate 10-40 wt%, glycidyl methacrylate 5-15 wt%, vinyltriethoxysilane, vinyltrimethoxysilane or 3-methacryloxypropyltrimethoxysilane 3-25 wt% by copolymerizing the composition It is characterized by using.

In this case, the mixed solvent is neopentyl glycol diglycidyl ether, triethyrol propane triglycidyl ether, polypropylene glycol diglycidyl ether, 1,4-butanediol diglycidyl ether, 1,6 hexanediol digly Any one or more selected from cyl ether may be used, and if the content is less than 20% by weight, the viscosity of the copolymer is too high, which is inconvenient to use, and the content of reactive diluent or alkylsilane is greater than 40% by weight. It is preferable to use the above-mentioned content because the viscosity of the final epoxy composition is lowered, resulting in a problem of flowing down when applied to the wall in water.

When the content of the methyl methacrylate is less than 20% by weight, the hydrophilicity of the polymer is lowered, when blended with the epoxy composition, the phenomenon of condensation in water is increased, and the workability is lowered. Since the value is higher but the impact strength is lowered, it is preferable to use it in the above range. The butyl acrylate has a property opposite to that of methacrylate. When exceeding% shows the problem of inferior workability when apply | coating in water.

The glycidyl methacrylate is a monomer introduced to induce a curing reaction with an amine-based curing agent together with bisphenol A and F-types by introducing an epoxy functional group into the copolymer, and when the amount is less than 5% by weight, an epoxy curing agent is formed. When the degree of curing is low, there is a problem that the strength is lowered, and when it exceeds 15% by weight, gelation proceeds during the synthesis of the copolymer, indicating a problem that polymerization is difficult.

The monomer containing a silane such as vinyltriethoxysilane, vinyltrimethoxysilane or 3-methacryloxypropyltrimethoxysilane induces a coupling reaction with a concrete wall or reinforcing fiber to play a role of showing strong adhesion. It will increase the strength of concrete wall and adhesion in water. In this case, when the amount is less than 3% by weight, the effect is insignificant, and when used in excess of 25% by weight, the gelation phenomenon occurs during the polymerization of the copolymer.

The copolymer prepared by the composition has an epoxy functional group in the polymer backbone and participates in the epoxy curing reaction, and has a methoxy or ethoxy silane functional group to enhance adhesion to reinforcing fibers. In addition, difunctional reactive epoxy diluents such as neopentylglycol diglycidyl ether used as a solvent, tetraethoxysilane (TEOS) and tetramethoxysilane (TMOS) promote curing reaction even at low temperatures when mixed with the curing agent. It will serve to improve the acid resistance and chemical resistance after curing. The copolymer is preferably used 5 to 20% by weight, in the case of using less than 5% by weight, the adhesion strength between concrete and reinforcing fibers in water is lowered, and in the case of more than 20% by weight, the adhesion strength with concrete Is increased, but the adhesive strength with the steel sheet is lowered and workability is degraded in water.

In the present invention, the aliphatic polyfunctional reactive diluent is used to maintain the proper viscosity required for the operation, it is preferable to use neopentyl glycol diglycidyl ether (Neopentyl Glycol diglycidyl ether). In addition, triethyrol propane triglycidyl ether, polypropylene glycol diglycidyl ether, 1,4-butanediol diglycidyl ether, 1,6 hexanediol diglycidyl ether, etc. can be used.

In the present invention, the inorganic filler is used to increase the strength of the final epoxy cured product and to maintain a smooth workability, and is not limited as long as it is commonly used, for example titanium dioxide, clay, calcium carbonate (CaCO ₃ ) Any one or more selected from silica fume, talc and aluminum hydroxide can be used. It is preferable to use the content of 10 to 30% by weight, the use of less than 10% by weight has a disadvantage of poor workability due to high condensation phenomenon due to the high content of the polymer in the epoxy composition, 30% by weight If it exceeds, there is a problem that the adhesion performance with the concrete or steel structure is deteriorated, it is preferable to use within the composition range.

Each component of a hardening | curing agent is demonstrated.

Components of the curing agent in the present invention is 1 to 10% by weight of polyamide amine type curing agent, 10 to 40% by weight of modified aliphatic polyamine curing agent, 30 to 70% by weight of modified alicyclic amine curing agent, 5 to 30% by weight of aminosilane compound, nonylphenol (nonyl phenol) 1 ~ 7% by weight, polyamide amine type curing agent, modified aliphatic polyamine curing agent, modified alicyclic amine curing agent and the like reacts with the main epoxy resin to produce mixed epoxy, physical and adhesive properties Finally, the amino silane increases the adhesion and strength between the concrete and the reinforcing fiber through the coupling action, and the nonyl phenol promotes curing and adds water repellency to reduce water absorption after curing.

The polyamide amine type curing agent is a kind of polyamide amine resin and can be used without limitation as long as it is commonly used by those skilled in the art in the most general form of the curing agent for epoxy. Such a polyamide amine type curing agent reacts with the epoxy resin to form an epoxy cured body and serves to exhibit the strength of the cured body. It is preferable to use the content of 1 to 10% by weight, and when used at less than 1% by weight, the strength and adhesion of the cured body composition are lowered, and when it exceeds 10% by weight, the adhesion performance with steel frame or concrete structure This phenomenon is lowered.

The modified modified aliphatic polyamine curing agent is to impart a smooth workability in the water and adheres without condensation, it is preferable to select a curing agent with a viscosity of about 2000 ~ 4000cps to maintain the final viscosity. Such products include KH-240, KH240-R of Kukdo Chemical, EPH137, EPH177, etc. of Hexion, and it is preferable to use EPH177 for impregnation, and to use EPH137 for primer or direct application. It is preferable in terms of. It is preferable to use the content of 10 to 40% by weight, the use of less than 10% by weight, there is a problem that workability in water is lowered, and when the content exceeds 40% by weight, the hydrophilicity becomes stronger, so that the final composition It is preferable to use it in the above range because the phenomenon appears and shows a phenomenon that the adhesion performance on the surface of the concrete or steel structure falls.

The modified cycloaliphatic amine curing agent is used to improve adhesion performance in water, wherein the viscosity is about 1000 ~ 3000 cps, the amine value is preferably between 300 ~ 360, such as KH-817 Kukdo Chemical. The content is in the range of 30 to 70% by weight, the use of less than 30% by weight results in a decrease in the adhesion in the water, and in the case of more than 70% by weight, the loosening phenomenon is severe in water and the adhesion strength is lowered in the above range It is good to use as.

The amino silane compound is used to increase the strength, 3-aminopropyltriethoxysilane, n- (2-aminoethyl) -3-aminopropyltrimethoxysilane, n- (2-aminoethyl)- Any one or more selected from 3-aminopropylmethyldiethoxysilane may be used, but preferably n- (2-aminoethyl) -3-aminopropyltrimethoxysilane is used. The content is used in the range of 5 to 30% by weight, the use of less than 5% by weight of the coupling effect is small, less than 30% by weight of the hardening degree is lowered to show the lowering of physical properties used in the above range It is desirable to.

The nonylphenol (nonyl phenol) is used as a plasticizer of the epoxy composition, the content is preferably used 1 to 7% by weight, when used in less than 1% by weight has a problem of poor workability, 7 weight When it exceeds%, since it shows the problem that the hardness and adhesive strength of the composition of a hardened | cured material fall, it is not preferable.

The silane-modified epoxy composition of the present invention can be classified into two types according to its use. One can be used as a primer on the vertical surface of water, or can be applied directly to a building structure or steel structure using a roller or a brush in water, or injected into a crack (hereinafter called CAUW-PR). It can be used, the viscosity of the preferred silane-modified epoxy composition at this time is 14,000 ~ 18,000 cps.

The other is a form in which the silane-modified epoxy composition is impregnated with carbon fiber, glass fiber, aramid fiber, etc. in a low viscosity state (hereinafter referred to as CAUW-SR). The viscosity of the silane-modified epoxy composition at this time is 9,000-11,000 cps.

When the main body and the hardener described above are blended at a ratio of 40 to 70 parts by weight of the curing agent with respect to 100 parts by weight of the main ingredient, preferably 50 to 60 parts by weight of the curing agent with respect to 100 parts by weight of the main ingredient, the reconstituted silane-modified epoxy composition of the present invention. Is manufactured. The composition according to the invention preferably has a viscosity of 9,000 to 18,000 cps.

The silane-modified epoxy composition for repairing underwater concrete structures prepared by the present invention can be applied to structures submerged in water, harbor structures such as underwater wells, concrete piles, steel pipe piles, bridge piers, sewers, storm boxes, etc. Or the like.

As a method of repairing and reinforcing an underwater structure using the silane-modified epoxy composition of the present invention, it is applied directly to a building structure or steel structure using a roller or a brush in water, or the silane-modified epoxy composition is glass fiber, carbon fiber, aramid One of the fibers selected from the fibers is impregnated in the amount of about 0.8 ~ 1.5kg / m ² attached to the target structure in water, or by injecting a silane-modified epoxy composition into the damaged damaged or cracked areas of underwater concrete, etc. Can be used. Since the composition according to the present invention has a viscosity and physical properties that can be adhered in water, there is a feature that can be applied to the structure of the underwater in a variety of ways.

Hereinafter, the present invention will be described in detail by examples. However, the examples are only to illustrate the invention and the present invention is not limited by the following examples.

[Production Example 1]

Epoxy functional group  Containing Silane Degeneration  Acrylic polymer compound (hereafter CONS- EP )Produce

30 Kg of a mixed solvent of tetraethoxysilane (Dow Corning Co., USA) and neopentyl glycol diglycidyl ether (HEXION company name 710) in a 2: 8 weight ratio was introduced into the reactor. 3-methacryloxypropyl trimethoxysilane (CHISSO, Japan) 10Kg, methyl methacrylate (Honam Petrochemical, product name: MMA) 40Kg, butyl acrylate (LG chemical, product name: BA) 20Kg, glycy 10 Kg of dimethyl methacrylate (Mitsubishi Rayon, Japan, product name: GMA) was copolymerized at 80 degreeC for 4 hours. At this time, the initiator used 0.2Kg of AIBN. After 4 hours, 0.1 kg of AIBN, an initiator, was further added into the reactor, and the reaction was continued at 80 ° C. for 2 hours. The result was a transparent liquid phase with a viscosity of 8400 cps / 23 ° C. (Brookfield viscometer, Spindel # 5) and a reaction yield of 99.98%.

Example 1

Epoxy Topic (A) Manufacturing

Silane modifications containing 42% by weight of bisphenol A type epoxy resin (Kukdo Chemical, YD-128), 16% by weight of bisphenol F type epoxy resin (Kukdo Chemical, YDF-165), and epoxy functional groups prepared in Preparation Example 1. 10% by weight of acrylic polymer (CONS-EP), 8% by weight of neopentyl glycol diglycidyl ether (HEXION, trade name: 710), 5% by weight of titanium dioxide, 3.5% by weight of talc, 7% by weight of calcium carbonate (CaCO ₃ ) And 8.5% by weight of silica fume were combined to prepare a subject.

Curing agent (B) manufacturing

15% by weight of polyamide type curing agent (Kukdo Chemical.G-0331), 20% by weight of modified aliphatic polyamine curing agent (Kukdo Chemical, KH-240), 50% by weight of modified alicyclic amine curing agent (Kukdo Chemical, KH-817) and nonyl phenol (Nonyl phenol) 10% by weight, n- (2-aminoethyl) -3-aminopropylmethyldiethoxysilane (CHISSO, Japan, trade name: S-310) 5% by weight of a curing agent was prepared.

Silane Degeneration  Epoxy Composition Preparation

Underwater concrete according to the present invention having a viscosity of 16,000 cps / 23 ° C. (Brookfield viscometer, Spindel # 5) by mixing 56 parts by weight of the curing agent at a temperature of 73 ° F. (23 ° C.) to 100 parts by weight of the prepared main ingredient (A). Structure repair reinforcement CAUW-PR was prepared.

Example 2

Epoxy Topic (A) Manufacturing

40 wt% of bisphenol A type epoxy resin used in Example 1, 12 wt% of bisphenol F type epoxy resin, 14 wt% of silane-modified acrylic polymer (CONS-EP) containing an epoxy functional group prepared in Preparation Example 1, neopentyl 10% by weight of glycol diglycidyl ether (trade name 710), 5% by weight of titanium dioxide, 3.5% by weight of talc, 7% by weight of calcium carbonate (CaCO ₃ ) and 8.5% by weight of fumed silica The subject was prepared.

Curing agent (B) manufacturing

15% by weight of polyamide type curing agent of the same kind as in Preparation Example 1, 20% by weight of modified aliphatic polyamine curing agent, 40% by weight of modified alicyclic polyamine curing agent, 10% by weight of nonyl phenol, n- (2-aminoethyl) A curing agent was prepared by combining 15% by weight of -3-aminopropylmethyldiethoxysilane.

Silane Degeneration  Epoxy Composition Preparation

56 parts by weight of the curing agent with respect to 100 parts by weight of the prepared main ingredient (A) was blended at a temperature of 73 ° F. (23 ° C.), and the viscosity was 10,000 cps / 23 ° C. (Brookfield viscometer, Spindel # 5). Structure repair reinforcement CAUW-SR was prepared.

Comparative Example 1

Epoxy Topic (A) Manufacturing

Comparative Example 1 was carried out using the same product as in Example 1. 47% by weight of bisphenol A type epoxy resin, 21% by weight of bisphenol F type epoxy resin, 8% by weight of neopentyl glycol diglycidyl ether, 5% by weight of titanium dioxide, 3.5% by weight of talc, 7% by weight of calcium carbonate (CaCO ₃ ) And 8.5% by weight of fumed silica were prepared to prepare the main material.

Curing agent (B) manufacturing

The same curing agent composition as in Example 1 was used.

Preparation of Epoxy Composition

Underwater concrete according to the present invention having a viscosity of 16,000 cps / 23 ° C. (Brookfield viscometer, Spindel # 5) by mixing 56 parts by weight of the curing agent at a temperature of 73 ° F. (23 ° C.) to 100 parts by weight of the prepared main ingredient (A). Structure repair reinforcement CAUW-PR was prepared.

Comparative Example 2

Comparative Example 2 was carried out using the same product as in Example 1.

Epoxy Topic (A) Manufacturing

Bisphenol A type epoxy resin 47% by weight, bisphenol F type epoxy resin 21% by weight, neopentyl glycol diglycidyl ether 8% by weight, titanium dioxide 5% by weight, talc 3.5% by weight, calcium carbonate (CaCO ₃ 7% by weight and 8.5% by weight of fumed silica were combined to prepare a subject.

Curing agent (B) manufacturing

The hardener was prepared by combining 15 wt% of the same polyamide type curing agent, 20 wt% of the modified aliphatic polyamine curing agent, 40 wt% of the modified alicyclic polyamine curing agent, and 10 wt% of nonyl phenol.

Epoxy Composition Preparation

56 parts by weight of the curing agent based on 100 parts by weight of the prepared main ingredient (A) was blended at a temperature of 73 ° F. (23 ° C.) to obtain an epoxy composition having a viscosity of 16,000 cps / 23 ° C. (Brookfield viscometer, Spindel # 5). Was prepared.

Experimental Example 1

As a result of measuring physical properties at room temperature 73 ° F. (23 ° C.) using the silane-modified epoxy composition for repair reinforcement prepared in Examples 1 and 2 and Comparative Examples 1 and 2, the results shown in Table 1 were obtained.

Hereinafter, the physical properties were measured using the following method and apparatus.

-Curing time: Time until the viscosity reaches 50,000 cps / 23 ℃ (Brookfield viscometer, Spindel # 5)

Compressive strength was measured by ASTM D695 method.

Modulus of elasticity: measured by ASTM D695 method.

-Compressive strength: measured by mixing with the aggregate by weight ratio of 1: 1 by ASTM C109 method.

Hardness: measured by ASTM 2240 method.

Flexural strength: measured by ASTM D790 method.

Tensile strength: measured by ASTM D638 method.

Adhesion strength in water: measured by ASTM C882 method.

TABLE 1

As shown in the above table, in Comparative Example 1, the silane-modified acrylic polymer was not contained, and in Comparative Example 2, the results obtained when the silane-modified acrylic polymer was not used and the aminosilane was not used in the curing agent are shown. As shown in Table 1, when the epoxy composition was prepared using the silane-modified acrylic polymer of the present invention, it can be seen that the physical properties such as compressive strength, elastic modulus, tensile strength, etc. are excellent. Compared with each other, the silane-modified acrylic polymer and the comparative example 2 excluding the aminosilane from the curing agent showed no adhesion performance and showed interfacial drop-off between reinforcing fibers and concrete in water.

Experimental Example 2

The results of measuring the chemical resistance using the silane-modified epoxy composition for repair reinforcement prepared in Examples 1 and 2 and Comparative Examples are shown in Tables 2 to 5 below.

The following chemical resistance was measured by applying a thickness of about 30 mm to the concrete surface at room temperature, and then measured the chemical resistance of the test specimen.

1: maintains adhesion state with concrete surface when contacted for more than 8 hours

2: maintains adhesion state with concrete surface when contacted more than 72 hours

3: Maintains adhesion state with concrete surface when contacted for 7 days or more

4: Maintain adhesion state with concrete surface when contacted for more than 30 days

[Table 2] Chemical Resistance to Acid Solutions

 [Table 3] Chemical resistance to miscellaneous liquids

[Table 4] Chemical Resistance to Alkaline Solution

[Table 5] Chemical Resistance to Other Solvents

As shown in the table, it was able to confirm the excellent chemical resistance of the repair reinforcement according to the present invention, and has an excellent chemical resistance has the effect of preventing the concrete neutralization when bonding to the concrete structure.

As described above, the water-reinforced concrete structure reinforcement composition according to the present invention increases the adhesion of civil engineering and building structures of reinforcement underwater and invasive papers, minimizes the fallout phenomenon, and also reduces mortar and concrete structure at low temperatures. It has the effect of exhibiting excellent adhesion and strength, it is excellent in durability of underwater civil engineering, building structures can be preserved semi-permanently.

Claims (8)

25 to 50% by weight of bisphenol A epoxy resin, 3 to 20% by weight of bisphenol F epoxy resin, 5 to 20% by weight of silane-modified acrylic polymer compound, 1 to 15% by weight of aliphatic difunctional reactive diluent, and 10 to 30% by weight of inorganic filler 1 to 10% by weight of polyamide amine type curing agent, 10 to 40% by weight of modified aliphatic polyamine, 30 to 70% by weight of modified alicyclic amine, and 5 to 30% by weight of aminosilane compound , 40 to 70 parts by weight of a curing agent (B) containing 1 to 7% by weight of nonylphenol. The method of claim 1, The silane-modified acrylic polymer compound is neopentyl glycol diglycidyl ether, triethyrol propane triglycidyl ether, polypropylene glycol diglycidyl ether, 1,4-butanediol diglycidyl ether, 1,6 hexanediol 20 to 40% by weight of any one or more solvent mixtures selected from diglycidyl ether, tetraethoxysilane and tetramethoxysilane, 20 to 60% by weight methyl methacrylate, 10 to 40% by weight butyl acrylate, glyci Underwater structure characterized in that a copolymer of 5 to 15% by weight of dimethyl methacrylate, 3 to 25% by weight of vinyltriethoxysilane, vinyltrimethoxysilane or 3-methacryloxypropyltrimethoxysilane Silane-modified epoxy composition for repair reinforcement. The method of claim 1, The aliphatic difunctional reactive diluent is neopentyl glycol diglycidyl ether, triethyrol propane triglycidyl ether, polypropylene glycol diglycidyl ether, 1,4-butanediol diglycidyl ether, 1,6 hexanediol Silane-modified epoxy composition for reinforcing underwater structures, characterized in that any one or more selected from di glycidyl ether. The method of claim 3, wherein The aliphatic difunctional reactive diluent is neopentyl glycol diglycidyl ether, characterized in that the silane-modified epoxy composition for reinforcing the underwater structure. The method of claim 1, The aminosilane compound is selected from 3-aminopropyltriethoxysilane, n- (2-aminoethyl) -3-aminopropyltrimethoxysilane, n- (2-aminoethyl) -3-aminopropylmethyldiethoxysilane Silane-modified epoxy composition for reinforcing underwater structure, characterized in that using any one or more selected. Repair and reinforcement method of underwater structure, characterized in that directly applied to the building structure or steel structure using a roller or a brush in water using the composition of any one of claims 1 to 5 The underwater structure of claim 1, wherein the silane-modified epoxy composition of any one of claims 1 to 5 is impregnated with any one of the fibers selected from glass fibers, carbon fibers, and aramid fibers and attached to the target structure in water. Reinforcement method. Claim 1 to 5, wherein the silane-modified epoxy composition of any one selected from claim 1 to the deterioration damaged or cracked portion of the underwater concrete, characterized in that the repair and reinforcement method of the underwater concrete structure.