KR20070077230A - Modified epoxy resin composition for repairing and reinforcing of pipe conduit - Google Patents

Abstract

A modified epoxy resin composition is provided to exhibit excellence in rapid curability and adhesive property on a wet surface, which is applicable for repairing and reinforcing a pipe conduit. The modified epoxy resin composition for repairing and reinforcing a pipe conduit, is comprised of (a) a base solution comprising 40-70 wt% of a bisphenol A type epoxy resin, 20-50 wt% of an urethane modified resin, 5-35 wt% of a polyfunctional epoxy resin, 5-10 wt% of benzyl alcohol and other additives, each being based the base solution; and (b) a curing solution comprising 20-50 wt% of an aliphatic modified polyamine, 30-70 wt% of an aromatic modified polyamine, 5-15 wt% of a curing catalyst and 5-10 wt% of benzyl alcohol, each being based on the curing solution.

Description

Modified Epoxy Resin Composition for Repairing and Reinforcing of Pipe Conduit}

1 is a partial cutaway perspective view of the sewage pipe after the liner of the modified epoxy resin composition according to the present invention is installed.

2 is a cross-sectional view of the liner according to the present invention.

3 is a schematic view illustrating a construction method for sewer repair.

It is explanatory drawing of the injection construction of the resin composition using an injector.

<Explanation of symbols on main parts of the drawings>

2 ... Crack 4 ....... Injector

6 ...... Insulation space 11p ...... Sewage pipe

11a ...... Felt 11b ...... Textile Jacket

11c ...... film 11r ...... resin composition

12a, 12b ... concrete wall

The present invention relates to a modified epoxy resin composition having excellent fast curing property and wet surface adhesion property, and more particularly, to wet surface adhesiveness as well as durability, prepared by adding an aromatic or aliphatic modified polyamine to bisphenol A type epoxy resin and urethane modified resin. The present invention relates to a modified epoxy resin composition which is excellent in chemical resistance, weather resistance, water resistance, and can be cured in a short time.

In general, the sewage pipes have various defects such as breakage, cracking, corrosion, wear, deformation, and leakage due to long-term use. Due to this, water pollution is seriously emerging, and therefore, repair and reinforcement of water pipes is an inevitable process. However, to excavate and replace the water and sewage pipe as a whole, not only the work is complicated, but there is a problem that the cost of the replacement work is consumed.

Therefore, as a method for facilitating the repair of the sewage pipes, a method of partially reinforcing or replacing a defect point without removing the existing water pipes by excavating a road has been developed. It is called repair technology.

Non-excavated water and sewage pipe repair technology is classified into various methods according to repair and reconstruction methods, and an appropriate method is selected according to the situation. These non-excavated water and sewage pipe repair techniques include, firstly, injection methods, link methods, and cooking methods from methods that are used for the purpose of preventing water infiltration or leakage from cracks, etc. Defects such as cracks, cracks, etc. are formed for the purpose of reinforcement from the inner surface of the pipe. Forming method, reversing method, lining method, etc. Third, the strength of the existing pipe is extremely reduced due to breakage, corrosion, abrasion, When water and sewage pipes are bent, or deformation and lack of cross-section cause the water and sewage to flow down, there is a rehabilitation method and a reconstruction maintenance method for the purpose of restoring the function if the role of the sewerage is insufficient even if a new pipe is replaced.

Among the various methods described above, after inverting the material impregnated with the fibrous material (nonwoven fabric) into the existing material by pneumatic or hydraulic pressure without replacing the existing pipe, the resin is cured by pressurization, heating or light in the pipe. The rehabilitation pipe process for the purpose of laying and regenerating pipes is widely used, and urethane, acrylic, or epoxy resins are used as conventional resins of reinforcing tubes applied to such rehabilitation pipes.

However, when urethane-based resins are used for the repair of sewer pipes, they are difficult to apply to sewer pipes where water always flows because they are not excellent in wet surface adhesion, and acrylic resins have good wet surface adhesiveness but severe shrinkage during hardening. In the case of the epoxy-based resin, in addition, the epoxy resin is known to have the best wet or submerged surface adhesion. However, the curing speed is low, so that repair and reinforcement are difficult in a short time.

Accordingly, an object of the present invention is to provide a modified epoxy resin composition that can be cured in a short time as well as excellent wet surface curability, which is applicable to the repair of whole, partial repairs and fine cracks of a sewage pipe damaged by various causes.

According to the invention,

(a) 40 to 70% by weight of bisphenol A epoxy resin, 20 to 50% by weight of urethane modified resin, 5 to 35% by weight of polyfunctional epoxy resin, 5 to 10% by weight of benzyl alcohol, and other additives based on the main solution Subject solution composed; And

(b) A curing solution composed of 20 to 50% by weight of an aliphatic modified polyamine, 30 to 70% by weight of an aromatic modified polyamine, 5 to 15% by weight of a curing catalyst, and 5 to 10% by weight of benzyl alcohol, based on the curing solution.

Provided is a modified epoxy resin composition for conduit repair and reinforcement.

In addition, according to the present invention, there is provided a tube for conduit repair and reinforcement consisting of a felt, a fiber jacket and a plastic film, characterized in that the modified epoxy resin composition is impregnated.

Furthermore, according to the present invention, there is provided a liner for conduit repair and reinforcement, characterized in that it is provided by curing the tube impregnated with the modified epoxy resin composition.

Hereinafter, the present invention will be described in more detail.

Since the bisphenol A epoxy resin used in the modified epoxy resin composition of the present invention has the same shrinkage expansion as concrete, there is no peeling phenomenon after curing, and since the water resistance is very excellent, there is little aging even if it is deposited in water for a long time. The resin has excellent chemical resistance and is a very good resin for repair and reinforcement of sewer pipes. However, epoxy resins have a curing time of at least 2 hours, which is not suitable for sewer pipe work requiring a shorter time.

Accordingly, the present invention adds an aromatic or aliphatic modified polyamine as a curing agent to a main solution including a urethane modified resin and a polyfunctional epoxy resin in addition to the bisphenol A epoxy resin, thereby increasing wet surface adhesion of the resin solution as well as curing in a short time. It can be carried out with technical features.

Hereinafter, the composition components and the ratio of the modified epoxy resin composition of the present invention will be described in detail.

First, the bisphenol A type epoxy resin, which is a component of the main solution, is used at 40 to 70% by weight based on the main solution, and when the amount of the bisphenol A type epoxy resin is less than 40% by weight, the storage stability of the main solution is reduced. If the property is poor, if the weight exceeds 70% by weight there is a problem that the curing rate is slow. In addition, the urethane-modified resin can be produced in a conventional manner, and is added in an amount of 20 to 50% by weight, when the addition amount is 20% by weight or less there is a problem that the durability is reduced, when added to more than 50% by weight wet cotton There is a problem of poor adhesion. The polyfunctional epoxy resin is added in an amount of 5 to 35% by weight based on the total weight, in which the curing time is slow when the addition amount is less than 5% by weight, and is not suitable in terms of cost when the addition amount is 35% by weight or more. In addition, 5-10% by weight of benzyl alcohol may be added to control viscosity and reactivity.

As the additive of the main solution, a moisture absorbent, a defoaming agent, a leveling agent, a dispersant, a filler, a flow preventing agent, an antifoaming agent, a silane coupling agent, a pigment, and the like may be added, which is commonly used in the art. Can be.

The curing solution added to the main solution is composed of an aliphatic modified polyamine, an aromatic modified polyamine curing agent and a curing catalyst, and benzyl alcohol may be added to adjust viscosity and responsiveness as necessary.

The aromatic modified polyamine used in the curing solution is not limited thereto, but metaphenylenediamine, diaminodiphenylmethane, diaminodiphenylsulfone, and the like may be used, and TH4280 of Kukdo Chemical is most preferably used. The aliphatic modified polyamines include, but are not limited to, diethylenetriamine, triethylenetetramine, and most preferably KH505 from Kukdo Chemical. The aliphatic modified polyamine may be added in an amount of 20 to 50% by weight based on the weight of the curing solution, where the amount is less than 20% by weight, the adhesion in water is lowered, if more than 50% by weight Inefficient. The addition amount of aromatic polyamine which is another component is 50 to 70 weight%, and when it is 70 weight% or more, intensity | strength becomes strong and there is a possibility of explosion.

In addition, a curing catalyst may be added for the purpose of controlling the curing rate of the curing solution, and as such a catalyst, but not limited thereto, 2,4,6-tris (dimethylaminomethyl) phenol (DMP-30), benzyl Dimethylamine (BDMA), benzoic acid or salicylic acid and the like can be used. The amount of the curing catalyst is used in an amount of 5 to 15% by weight based on the total weight, when the amount used is 5% by weight or less, the curing speed is slow, and when the amount is more than 15% by weight, the pot life is shortened and durability is reduced. .

The mixing ratio of the main solution and the curing solution prepared as described above is preferably 3: 1 by weight.

After mixing the above-mentioned main agent and the curing agent, it should be used within the pot life. When mixing the excess main agent and the curing agent, the pot life is shortened, so be careful in the work.

The modified epoxy resin composition of the present invention provided as described above is sufficiently mixed with the main agent and the curing agent, and then impregnated into the tube material for application to the whole or partial repair of the sewer pipe or using an injector for repair of the microcracks. Applicable.

Hereinafter, a repair and reinforcement process of a liner and a conduit using the resin composition according to the present invention will be described with reference to FIGS. 1 to 4, and the present invention is not limited thereto.

First, the liner provided according to the invention consists of a felt 11a, a fiber jacket 11b, and a film 11c in the order of being adhered to the existing sewer pipe 11p, as shown in Figs.

In this case, the felt 11a may be a non-woven fabric and / or a woven fabric that is softly woven in one or two or more layers. Preferably, the woven fabric or synthetic fiber of glass or polyester felt is woven into a dense mesh form. Which may be used, most preferably glass fiber felt. The tube is composed of such a felt 11a, a fiber jacket 11b and a film 11c, among which the role of the felt 11a and the fiber jacket 11b serves to fix the resin composition 11r so that it does not flow down. It is. In addition, the film 11c forms an impermeable plastic film (inner tube upon completion) on the inner surface of the tube to prevent the resin from being impregnated by the pressure used during curing and to lower the roughness coefficient of the pipe wall. As the plastic film, a film of polyethylene, vinyl chloride, vinylon, polyurethane, nylon, polypropylene, polyethylene nylon copolymer, or the like may be used.

In one embodiment of the present invention, in order to use the tube impregnated with the modified epoxy resin composition of the present invention for repair of a sewer pipe, the tube made of felt and a fiber jacket is impregnated with the resin composition and moved to a prepared state. The tube impregnated with the resin composition thus prepared is applied to the sewer pipe by the inversion method, and when the inversion method is applied, the working pressure may vary depending on the diameter size of the pipe line to be applied, and this working pressure is constant during the curing time of the liner. It must be maintained. If the working pressure is not maintained, problems such as twisting the resin impregnation tube may occur.

In addition, the curing proceeds after the insertion of the tube impregnated with the modified epoxy resin composition of the present invention is performed by the application of air, heat and / or light, and in the case of curing the composition by applying heat, a hot air fan as a heat source. A boiler or the like may be used, and most preferably, steam heat generated from the boiler is used. There is no limit to the source when curing by applying light. The curing completion time of the liner thus applied is within about 5 to 20 minutes on average. After hardening is completed, it should be slowly cooled to room temperature, and when the cooling is performed quickly, adverse effects on the liner quality occur, cracks, etc., and consequently, sewage is leaked.

Figure 3 shows the construction process using the liner according to the present invention for repair of the sewerage, in more detail about this, first, the location and shape of the broken by entering the CCTV camera into the broken sewer pipe 200 to be repaired After checking the obstacles, such as the soil (3a), and cleans while removing various foreign matters such as soil and sludge in the area to be repaired in the pipeline 200 with a high-pressure jet cleaner (3b). Towing and fixing the glass fiber felt (3c) impregnated with the resin composition prepared according to the present invention to the damaged point inside the sewer pipe, and pressurized by injecting the compressed air into the packer, which is an unmanned repair fitting machine (3d), After fully hardened inside the damaged pipe (3e), the compressed air is discharged and returned to its original state, and then removed out of the pipe.

Figure 4 shows the form to repair and reinforce the modified epoxy resin composition according to the invention in the microcracks of the sewer pipe using an injector.

As described above, when the modified resin composition provided according to the present invention is used for repair and reinforcement of the sewer pipe, wet surface adhesiveness, as well as the curing speed is increased to shorten the working time, shrinkage peeling after curing It is excellent in durability, chemical resistance, weather resistance, water resistance, and waterproofness, and the sewage pipes of sewers formed by embedding circular pipes such as cast iron pipes, cement pipes, and plastic pipes in the basement are aged, causing damage or floating settlement. As a result, cracks may be generated, or the whole or partial repair of the sewage pipe damaged by various causes such as a step between the pipe and the pipe may be suitably used to repair the microcracks using the injector.

Hereinafter, the present invention will be described in more detail with reference to Examples, which are not intended to limit the present invention.

Example

Inventive materials according to the present invention were prepared by mixing the additives in Table 1, and the physical properties of the inventive materials (Epoxy 540) and the comparative material (Harz 2000) were measured, and the results are shown in Table 2 below.

TABLE 1

Invention Furtherance weight% Topic solution Bisphenol A type epoxy resin 40 Urethane Modified Resin 35 Multifunctional Epoxy Resin 15 Benzyl alcohol 5 Antifoam 5 Curing solution Aliphatic modified polyamines 35 Aromatic modified polyamines 40 Curing catalyst 15 Benzyl alcohol 5

TABLE 2

Properties Invention Comparative material Test Methods Pot life (min / 25 ℃) 12 15 KS M 6030 Curing condition (time / 25 ℃) 6 6 KS M 3705 Curing condition (time / 10 ℃) 12 10 KS M 3705 Wet Adhesiveness (kg / cm ² ) 42 8 Compressive strength (kg / cm ³ ) 1246 482 KS M 3015 Tensile Strength (kg / cm ³ ) 295 92 KS M 3006 Flexural Strength (kg / cm ³ ) 585 150 KS M 3015 Viscosity (topic) (mpa.s) 2700 160 KS M 3705 Viscosity (Hardener) (mpa.s) 880 290 KS M 3705 Impact Strength (kJ / m ² ) 3.8 2.3 KS M 3055 Tensile Shear Adhesion Strength (N / m ² ) 144 18 KS M 3734 Strength (shore D) 82 66 ASTM D 2240 importance 1.21 1.23 KS M ISO 2811-1

As shown in the table, it can be seen that the present invention material is very excellent in wet surface adhesion is about 5 times or more compared with the comparative material, the compressive strength is also very robust about 3 times the comparative material. In addition, the tensile strength and the flexural strength is very high, the peeling phenomenon does not occur even in a phenomenon such as tectonic change, it can be seen that it is very excellent for the repair and reinforcement of the conduit.

As described above, when the modified epoxy resin composition provided according to the present invention is used for repair and reinforcement of sewage pipes, wet surface adhesiveness can be cured in a short time to improve workability, and durability, chemical resistance, water resistance, weather resistance, etc. There is an improvement effect.

Claims (3)

(a) 40 to 70% by weight of bisphenol A epoxy resin, 20 to 50% by weight of urethane modified resin, 5 to 35% by weight of polyfunctional epoxy resin, 5 to 10% by weight of benzyl alcohol, and other additives based on the main solution Subject solution composed; And (b) 20 to 50% by weight of an aliphatic modified polyamine, 30 to 70% by weight of an aromatic modified polyamine, 5 to 15% by weight of a curing catalyst, and 5 to 10% by weight of benzyl alcohol, based on the curing solution. A modified epoxy resin composition for conduit repair and reinforcement. A conduit repair and reinforcement tube comprising a felt, fiber jacket, and plastic film impregnated with the modified epoxy resin composition of claim 1. A conduit repair and reinforcement liner, wherein the modified epoxy resin composition according to claim 1 is provided by curing an impregnated tube.

Images