KR102040173B1 - Flame Retardant Adhesive Composition and Method for Reinforcing Concrete Structure Using the Same - Google Patents

Abstract

The present invention relates to a flame retardant adhesive composition and a method for reinforcing a concrete structure using the same and, more specifically, to a flame retardant adhesive composition which has excellent physical and chemical performance and excellent heat resistance, prevents diffusion of a fire when a fire occurs, and prevents emission of substances harmful to a human body, and a method for reinforcing a concrete structure using the same. The flame retardant adhesive composition according to the present invention has excellent heat resistance and flame retardancy, thereby preventing diffusion of a fire when a fire occurs, preventing generation and emission of harmful gas to be harmless to a human body, and preventing a rapid reduction of a reinforcing effect of a concrete structure caused by damage to an adhesive even when a fire occurs. In addition, since a thermal expansion coefficient of the adhesive is similar to that of concrete, a separation of a reinforcing material due to a thermal behavior is prevented, thereby maintaining the reinforcing effect of the concrete structure for a long period of time.

Description

Flame Retardant Adhesive Composition and Method for Reinforcing Concrete Structure Using the Same}

The present invention relates to a flame-retardant adhesive composition and a method for reinforcing concrete structures using the same, and more particularly, has excellent physical and chemical performance, excellent heat resistance, prevents the spread of fire in the event of a fire, and releases harmful substances to the human body. Flame retardant adhesive composition and concrete structure reinforcement method using the same.

Concrete structures, such as construction, environmental or structural factors over time due to a number of structural performance problems, such as reduced strength. In order to restore the structural performance of the concrete structure to the original, the steel sheet bonding reinforcement method has been used a lot previously, but due to the problems of the large weight and corrosion of the steel sheet in recent years to adhere the fiber reinforcement light and large resistance to corrosion Many methods are used, and the adhesive for bonding the fiber reinforcement is most often used epoxy resin excellent in electrical insulation and chemical and mechanical properties.

However, since epoxy resins are poor in flame retardancy, they have limitations in application to construction materials and electrical components. In order to solve this problem, flame retardant epoxy resins having imparted flame retardant properties to epoxy resins have been developed and used.

Conventional flame retardant epoxy resins require a large amount of flame retardant to be added to enhance flame retardancy, resulting in deterioration of the properties of the epoxy resin, and workability deteriorates and manufactures as additional materials or additives are required to compensate for the reduced physical properties. There was a problem of rising costs.

In addition, when processing and burning at high temperatures, harmful gases such as hydrogen bromide or hydrogen chloride are generated and released, thereby limiting their use.

Korean Patent Publication No. 10-2016-0096250

In order to solve the above problems, the present invention not only has excellent physical and chemical performance and excellent heat resistance, but also prevents the spread of fire in the event of fire and releases harmful substances to the human body, and a concrete structure reinforcement method using the same. To provide.

One aspect of the present invention is 35.15 to 35.42% by weight epoxy resin, 26.72 to 26.94% by weight carbon nanotube, 15.33 to 15.56% by weight polyimide, 9.13 to 9.32% by weight polymethylphenylsilsesquioxane %, 6.32-6.46 wt% isocyanate, 2.72-2.82 wt% isoparaffin, 4.10-4.24 wt% silica; And a curing agent; relates to a flame-retardant adhesive composition comprising.

Another aspect of the invention is a concrete surface treatment step (step 1) to remove the deterioration layer and foreign matter on the surface of the concrete structure; A flame-retardant adhesive coating step of applying a flame-retardant adhesive on the surface-treated concrete structure (step 2); And bonding the reinforcing fiber sheet on the applied flame retardant adhesive (step 3). The flame-retardant adhesive comprises 35.15 to 35.42 wt% epoxy resin, 26.72 to 26.94 wt% carbon nanotube, 15.33 to 15.56 wt% polyimide, 9.13 to 9.32 wt% polymethylphenylsilsesuccioxane, 6.32 to 6.46 wt% isocyanate Comprising, 2.72-2.82 weight percent isoparaffin, 4.10-4.24 weight percent silica; And a curing agent comprising 83.92 to 84.27 weight percent of cycloaliphatic polyamine, 13.15 to 13.52 weight percent of uranyl acetylacetonate, 1.34 to 1.48 weight percent of polyether polyol, and 1.12 to 1.20 weight percent of cobalt octoate It is about a method.

Another aspect of the invention the concrete surface treatment step of removing the deterioration layer and foreign matter on the surface of the concrete structure; Applying a flame retardant adhesive to the concrete structure treated with the surface; And a reinforcing fiber panel bonding step of adhering a reinforcing fiber panel on the applied flame retardant adhesive; wherein the flame retardant adhesive is 35.15 to 35.42 wt% of epoxy resin, 26.72 to 26.94 wt% of carbon nanotube, and 15.33 to 15.56 polyimide A subject comprising, by weight, polymethylphenylsilsesquioxane 9.13 to 9.32 weight percent, isocyanate 6.32 to 6.46 weight percent, isoparaffin 2.72 to 2.82 weight percent, silica 4.10 to 4.24 weight percent; And a curing agent comprising 83.92 to 84.27 weight percent of cycloaliphatic polyamine, 13.15 to 13.52 weight percent of uranyl acetylacetonate, 1.34 to 1.48 weight percent of polyether polyol, and 1.12 to 1.20 weight percent of cobalt octoate Provide a method.

The flame retardant adhesive composition and the concrete structure reinforcement method using the same according to the present invention have excellent heat resistance and flame retardancy, so that the spread of the fire is prevented in the event of a fire and the generation and release of harmful gases is not harmful to the human body. There is an effect to prevent the rapid deterioration of the concrete structure due to the damage of the adhesive.

In addition, since the coefficient of thermal expansion of the adhesive is similar to that of concrete, the dropping of the reinforcement due to thermal behavior is prevented, so that the reinforcing effect of the structure can be maintained for a long time.

1 is a block diagram showing a concrete structure reinforcement method according to an embodiment of the present invention.
Figure 2 is a block diagram showing a concrete structure reinforcement method according to another embodiment of the present invention.
3 is a graph showing the results of measuring the adhesive strength of the flame retardant adhesive composition according to an embodiment of the present invention.
Figure 4 is a graph showing the tensile strength measurement results of the flame-retardant adhesive composition according to an embodiment of the present invention.
5 is a compressive strength of the flame retardant adhesive composition according to an embodiment of the present invention It is a graph showing a measurement result.
Figure 6 is a graph showing the thermal expansion coefficient measurement results of the flame-retardant adhesive composition according to an embodiment of the present invention.
7 is a graph showing a measurement result of the weight change of the flame-retardant adhesive according to an embodiment of the present invention.
8 is a graph showing the measurement results of the limit oxygen index of the flame-retardant adhesive composition according to an embodiment of the present invention.
9 is a graph showing a measurement result of the carbonized layer production amount of the flame-retardant adhesive composition according to an embodiment of the present invention.
10 is a graph showing a combustion time measurement result of a flame retardant adhesive composition according to an embodiment of the present invention.

Hereinafter, various aspects and various embodiments of the present invention will be described in more detail.

According to an aspect of the present invention, 35.15 to 35.42 wt% epoxy resin, 26.72 to 26.94 wt% carbon nanotube, 15.33 to 15.56 wt% polyimide, 9.13 to 9.32 wt% polymethylphenylsilsesuccioxane, 6.32 to 6.46 wt% isocyanate Comprising, 2.72-2.82 weight percent isoparaffin, 4.10-4.24 weight percent silica; And it provides a flame-retardant adhesive composition comprising a curing agent.

The epoxy resin may improve adhesion and serve as a binder, and may be any one or a mixture of two or more selected from bisphenol-based, bromine-based, and phosphorus-based compounds. When the epoxy resin is included less than 35.15% by weight, the adhesive strength of the adhesive may be insufficient, and when the epoxy resin exceeds 35.42% by weight may have a problem that the flame resistance of the adhesive is reduced.

The carbon nanotubes are for enhancing the flame retardancy by forming a barrier layer for oxygen barrier and thermal insulation, and when included in less than 26.72% by weight, the formation of a barrier layer may be insufficient, and includes more than 26.94% by weight. In this case, the viscosity of the adhesive may increase, and thus the workability may be insufficient, which is not preferable.

The polyimide is intended to improve the heat resistance of the adhesive, and if less than 15.33% by weight of the adhesive may be insufficient heat resistance, when it exceeds 15.56% by weight excessive heat is generated during curing of the adhesive, pot life This shortening problem may occur.

The polymethylphenylsilsesquioxane (polymethylphenylsilsesquioxane) to form an insoluble material in the deteriorated pores of the concrete structure to increase the surface strength of the concrete structure, to reduce the thermal expansion coefficient of the epoxy resin to make the thermal behavior similar to the concrete Used. When the polymethylphenylsilsesuccioxane is included in less than 9.13% by weight, the effect of improving the surface strength of the concrete structure and reducing the coefficient of thermal expansion of the primer is insufficient, and when used in excess of 9,32% by weight, the shrinkage of the adhesive after curing is preferable. Not.

The isocyanate is to improve the impact resistance of the adhesive, when included in less than 6.32% by weight, the impact resistance of the adhesive may be insufficient, and when included in excess of 6.46% by weight, the hygroscopicity of the adhesive is increased to cure There may be a delay.

The isoparaffin is to serve to stabilize the adhesive and to control the viscosity, when it is included in less than 2.72% by weight, not only does not sufficiently prevent the chemical change of the adhesive, but also difficult to apply due to excessive spreading of the adhesive, 2.82 It is not preferable because the viscosity of the adhesive will be higher when the weight ratio is exceeded, which may make it difficult to apply the adhesive.

The silica (silica) is used as an extender of the adhesive to reduce the coefficient of thermal expansion, when included less than 4.10% by weight of the effect of reducing the coefficient of thermal expansion is insufficient, and exceeds 4.24% by weight, the viscosity of the adhesive is high to apply the adhesive It is not desirable because the work becomes difficult.

According to one embodiment, the curing agent may comprise 83.92 to 84.27 weight percent of cycloaliphatic polyamine, 13.15 to 13.52 weight percent of uranyl acetylacetonate, 1.34 to 1.48 weight percent of polyether polyol, and 1.12 to 1.20 weight percent of cobalt octoate Can be.

The cycloaliphatic polyamine is used to cure the adhesive, and the curing time of the adhesive is increased when it is less than 83.92% by weight, and when used in excess of 84.27% by weight, a rapid reaction causes an uneven curing reaction to cause the adhesive. Since physical properties can be greatly reduced, it is not preferable.

The uranyl acetylacetonate (uranyl acetylacetonate) is used to enable the curing at low temperature conditions, when used less than 13.15% by weight may be insufficient curing at low temperatures, when exceeding 13.52% by weight of the mechanical strength of the adhesive May cause a problem of deterioration.

The polyether polyol is used to promote the curing reaction at low temperatures, when less than 1.34% by weight of the adhesive hardening effect is insufficient at low temperatures, when used over 1.48% by weight excessive heat is generated during the curing of the adhesive There may be a problem that the pot life is shortened.

Cobalt octoate (cobalt octoate) is to promote the reaction of the adhesive, when used less than 1.12% by weight may delay the curing time of the adhesive, when exceeding 1.20% by weight shorten the pot life due to insufficient workability can do.

According to another embodiment, the flame retardant adhesive composition may mix the main ingredient and the curing agent in a weight ratio of 1 to 5: 1. The blending ratio may be appropriately selected and used within the above ranges in consideration of curing time and viscosity.

According to another aspect of the invention, the concrete surface treatment step of removing the deterioration layer and foreign matter on the surface of the concrete structure; Applying a flame retardant adhesive to the concrete structure treated with the surface; Reinforcing fiber sheet bonding step of adhering a reinforcing fiber sheet on the applied flame retardant adhesive; And a flame-retardant adhesive impregnating step of impregnating the reinforcing fiber sheet with the flame-retardant adhesive composition, wherein the flame-retardant adhesive comprises 35.15 to 35.42 wt% of epoxy resin, 26.72 to 26.94 wt% of carbon nanotube, and 15.33 to 15.56 wt% of polyimide A subject comprising 9.13 to 9.32 weight percent polymethylphenylsilsesuccioxane, 6.32 to 6.46 weight percent isocyanate, 2.72 to 2.82 weight percent isoparaffin, and 4.10 to 4.24 weight percent silica; And a curing agent comprising 83.92 to 84.27 weight percent of cycloaliphatic polyamine, 13.15 to 13.52 weight percent of uranyl acetylacetonate, 1.34 to 1.48 weight percent of polyether polyol, and 1.12 to 1.20 weight percent of cobalt octoate Provide a method. 1 is a block diagram showing a concrete structure reinforcement method according to an embodiment of the present invention.

The concrete surface treatment step (M101) is a step of removing the deterioration layer and foreign matter on the surface of the concrete structure, it can be removed and polished using an electric grinder or the like. In addition, if there is a dropping part in the cross section of the concrete structure, the section may be repaired, and if there is a crack, it may be repaired by crack injection or crack filling.

The flame-retardant adhesive coating step (M102) is a step for adhering the fiber reinforcement sheet, and the main body and the curing agent in a container at a predetermined mixing ratio, stirred until uniform, and then cracked and applied with a roller, brush, etc. if necessary It can apply 2 times or more. In addition, the primer may be applied after the concrete surface treatment if necessary, and a flame-retardant adhesive may be applied to the surface of the concrete structure to which the primer is applied.

Reinforcing fiber sheet adhering step (M103) is a step of reinforcing a concrete structure with a reinforcing fiber sheet, cut the reinforcing fiber sheet according to a predetermined size using scissors, a cutter, etc. It is preferable to rub the surface of the reinforcing fiber sheet strongly two or three times along the fiber direction with a roller or a rubber spatula so that the applied flame retardant adhesive is impregnated. Moreover, it is preferable to laminate | stack and bond 10 cm or more in the longitudinal direction of a reinforcing fiber sheet.

Flame-retardant adhesive impregnation step (M104) is to more strongly adhere the adhesion of the bonded reinforcing fiber sheet, the main body and the curing agent in a container at a predetermined mixing ratio and stirred until uniform, and then bonded with a roller, brush, etc. It can be impregnated uniformly on the upper surface of the reinforced reinforcing fiber sheet and, if necessary, two or more times.

According to a most preferred embodiment, the flame-retardant adhesive impregnation step, the reinforcing fiber sheet 10 to 13 parts by weight of natural oil, 5 to 7 parts by weight of chitosan, anthranilic acid with respect to 100 parts by weight of the flame retardant adhesive composition acid) 5 to 7 parts by weight, acrylic resin 3 to 4 parts by weight, liquid rubber (liquid rubber) may be impregnated with a mixture containing 1 to 2 parts by weight and 1 to 2 parts by weight of cerium oxide (cerium oxide).

When the natural oil, chitosan, anthranilic acid, acrylic resin, liquid rubber, and cerium oxide are mixed with the flame retardant adhesive in the respective composition ranges to impregnate the reinforcing fiber sheet, not only the reinforcing fiber sheet can be more strongly attached. In addition, the resistance to ultraviolet rays, waterproofness, and acid resistance of the reinforcing fiber sheet were greatly improved, and it was confirmed that the reinforcing of concrete structures affected by external environmental factors such as ultraviolet rays or acid rain was very effective.

On the other hand, when the type of the material mixed with the flame retardant adhesive is different, or the composition of each material does not satisfy the above range, the compatibility with the flame retardant adhesive is not good, or the excellent heat resistance and flame retardancy of the flame retardant adhesive itself It was confirmed that the degradation, the resistance to the influence of the external environmental factors of the reinforcing fiber sheet was not exhibited.

The natural oil may be used both vegetable and animal oil, preferably may be any one or a mixture of two or more selected from canola oil, cinnamon oil and fish oil.

Another aspect of the invention the concrete surface treatment step of removing the deterioration layer and foreign matter on the surface of the concrete structure; Applying a flame retardant adhesive to the concrete structure treated with the surface; And a reinforcing fiber panel bonding step of adhering a reinforcing fiber panel on the applied flame retardant adhesive; wherein the flame retardant adhesive is 35.15 to 35.42 wt% of epoxy resin, 26.72 to 26.94 wt% of carbon nanotube, and 15.33 to 15.56 polyimide A subject comprising, by weight, polymethylphenylsilsesquioxane 9.13 to 9.32 weight percent, isocyanate 6.32 to 6.46 weight percent, isoparaffin 2.72 to 2.82 weight percent, silica 4.10 to 4.24 weight percent; And a curing agent comprising 83.92 to 84.27 weight percent of cycloaliphatic polyamine, 13.15 to 13.52 weight percent of uranyl acetylacetonate, 1.34 to 1.48 weight percent of polyether polyol, and 1.12 to 1.20 weight percent of cobalt octoate Provide a method.

The concrete surface treatment step (M201) is a step of removing the deterioration layer and foreign matter on the surface of the concrete structure, using a grinder or the like to remove and polish. In addition, if there is a dropping part in the cross section of the concrete structure, the cross section is repaired, and if there is a crack, it is repaired by a crack injection or crack filling method.

The flame-retardant adhesive coating step (M202) is a step for adhering the reinforcing fiber panel, the concrete structure to bond the reinforcing fiber panel for adhesive performance after stirring until the main body and the curing agent is uniform in a container at a predetermined mixing ratio A flame retardant adhesive is applied to the surface using a rubber sputter, and a flame retardant adhesive is applied to one surface of the reinforcing fiber panel using a rubber sputter. In addition, if necessary, the primer may be applied to the surface of the concrete structure to which the reinforcing fiber panels are to be bonded after the concrete surface treatment, and the flame-retardant adhesive may be applied to the surface of the concrete structure to which the primer is applied.

The reinforcing fiber panel attaching step (M203) is a step of reinforcing the concrete structure with the reinforcing fiber panel, and presses the reinforcing fiber panel coated with the flame retardant adhesive to the surface of the concrete structure applied with the flame retardant adhesive. At this time, it is preferable to pressurize using a rubber rotary roller or the like so that the excess flame-retardant adhesive is released along both sides of the reinforcing fiber panel bonded to the concrete structure surface. Excess flame-retardant adhesive is removed using a rubber sputter or dry cloth. In addition, the reinforcing fiber panel bonding step (M203) may be reinforced by fixing the reinforcing fiber panel on the surface of the concrete structure with anchor bolts and then sealing the surroundings of the reinforcing fiber panel and injecting the flame retardant adhesive to reinforce the concrete structure.

Hereinafter, preferred examples are provided to aid in understanding the present invention. However, these examples are intended to illustrate the present invention in more detail, and the scope of the present invention is not limited thereto, and various changes and modifications are possible within the scope and spirit of the present invention. It will be self-evident to those who have knowledge.

Example. Preparation of Flame Retardant Adhesive Compositions

subject

The subject was prepared by mixing 35.35 wt% epoxy, 26.87 wt% carbon nanotube, 15.42 wt% polyimide, 9.16 wt% polymethylphenylsilsesquioxane, 6.34 wt% isocyanate, 2.74 wt% isoparaffin, 4.12 wt% silica.

Hardener

A curing agent was prepared by mixing 84.23 wt% cycloaliphatic polyamine, 13.22 wt% uranyl acetylacetonate, 1.40 wt% polyether polyol, and 1.15 wt% cobalt octoate.

Formulation and formulation of hardener

The flame retardant adhesive composition and the curing agent were mixed at a weight ratio of 1: 1 to prepare a flame retardant adhesive.

Comparative Example 1.

A test piece was prepared in the same manner as in Example D using a flame retardant adhesive of D Company in Korea.

Comparative Example 2.

A specimen was produced in the same manner as the above-described flame-retardant adhesive of the foreign company S.

Experimental Example 1. Adhesion Strength Measurement

In order to evaluate the adhesive performance of the flame-retardant adhesive composition of the above examples and comparative examples, test specimens were prepared according to KS F 4923 concrete structure repair epoxy resin and the adhesive strength was measured. 3 is a graph showing the results of measuring the adhesive strength of the flame retardant adhesive composition according to an embodiment of the present invention.

As shown in Figure 3, the adhesive strength of the flame-retardant adhesive composition according to the embodiment was the highest at standard conditions and low temperature was able to confirm excellent adhesion performance.

Experimental Example 2 Measurement of Tensile Strength

In order to evaluate the tensile performance of the flame-retardant adhesive composition of the above Examples and Comparative Examples, test specimens were prepared according to KS F 4923 concrete structure repair epoxy resin and the tensile strength was measured. Figure 4 is a graph showing the tensile strength measurement results of the flame-retardant adhesive composition according to an embodiment of the present invention.

As can be seen from Figure 4, the tensile strength of the flame-retardant adhesive composition according to the embodiment is shown to be the highest, the flame-retardant adhesive composition according to the embodiment is also used in the flexural reinforcement of the concrete structure together with the reinforcing fiber sheet or reinforcing fiber panel It was confirmed that there is an effect.

Experimental Example 3. Measurement of Compressive Strength

In order to evaluate the compression performance of the flame-retardant adhesive composition of the above examples and comparative examples, test specimens were prepared according to KS F 4923 epoxy resin for repairing concrete structures, and the compressive strength was measured. 5 is a graph showing the compressive strength measurement results of the flame-retardant adhesive composition according to an embodiment of the present invention.

As can be seen from FIG. 5, the compressive strength of the flame retardant adhesive composition according to the embodiment is the highest, and the flame retardant adhesive composition according to the embodiment is effective in compressive reinforcement of the structure even when the concrete structure is applied to the upper surface. It was found out.

Experimental Example 4. Measurement of thermal expansion coefficient

In order to evaluate the coefficient of thermal expansion of the flame-retardant adhesive composition according to the above Examples and Comparative Examples, test specimens were prepared and tested according to ASTM E831 Standard Test Method for Linear Thermal Expansion of Solid Materials by Thermomechanical Analysis.

In addition, a concrete test specimen was manufactured and tested to exchange the coefficient of thermal expansion with concrete. Figure 6 is a graph showing the thermal expansion coefficient measurement results of the flame-retardant adhesive composition according to an embodiment of the present invention.

 As can be seen from Figure 6, the thermal expansion coefficient of the flame retardant adhesive composition according to the embodiment appeared the smallest, and appeared similar to the thermal expansion coefficient of concrete, the thermal behavior of the adhesive composition and the concrete structure according to the present invention Since it is similar, integration is possible.

Experimental Example 5. Measurement of pyrolysis behavior

In order to evaluate the heat resistance performance of the flame-retardant adhesive composition according to the above Examples and Comparative Examples using a thermogravimetric analyzer under an air atmosphere (100 cc / min) at a temperature rising rate of 50 ℃ at room temperature to 900 ℃ according to the temperature change The weight change was measured. Figure 7 is a graph showing the results of measuring the thermal decomposition temperature of the flame-retardant adhesive composition according to an embodiment of the present invention.

As can be seen from FIG. 7, the decomposition temperature of the flame retardant adhesive composition according to the embodiment was the highest, and it was found that the heat resistance of the flame retardant adhesive composition according to the present invention was excellent.

Experimental Example 6. Measurement of limit oxygen index

In order to evaluate the combustion performance and the flame retardant performance of the flame-retardant adhesive composition according to the examples and comparative examples, the test body was manufactured according to ASTM D 2863 Standard Test Method for Measuring the Minimum Oxygen Concentration to Support Candle-Like Combustion of Plastics (Oxygen Index) And tested. 8 is a graph showing the measurement results of the limit oxygen index of the flame-retardant adhesive composition according to an embodiment of the present invention.

As can be seen from FIG. 8, it was found that the limit oxygen index of the flame retardant adhesive composition according to the embodiment was the highest, indicating that the flame retardant adhesive composition according to the present invention had excellent resistance to ignition or ignition.

Experimental Example 7 Measurement of Carbonization Formation

In order to evaluate the flame retardant performance of the flame retardant adhesive compositions according to the examples and comparative examples, the flow rate of O ₂ and N ₂ was measured at a concentration of oxygen 2% higher than the limit oxygen index using an oxygen index tester. The combustion time was 3 minutes, and the mass and the amount of carbide formation before and after combustion were measured using a wire gauge. 9 is a graph showing a measurement result of the carbonized layer production amount of the flame-retardant adhesive composition according to an embodiment of the present invention.

As can be seen from FIG. 9, the carbonized layer generation amount of the flame retardant adhesive composition according to the embodiment was the largest, and the flame retardant adhesive composition according to the present invention was found to have excellent performance of blocking oxygen and heat.

Experimental Example 8. Flame retardancy measurement

In order to evaluate the flame retardant performance of the flame retardant adhesive composition according to the above Examples and Comparative Examples, test specimens were manufactured and tested according to UL 94 Standard for Tests for Flammability of Plastic Materials for Parts in Devices and Appliances. The burn time and the burn pattern were measured.

In addition, the evaluation criteria for the flame retardant grade was evaluated by Table 1 according to the UL 94 V Test.

Flame Retardant Rating Criteria

V0 V1 V2 Individual combustion time ≤ 10sec ≤ 30sec ≤ 30sec Total combustion time by pretreatment condition
(t1 + t2) ≤ 50sec ≤ 250sec ≤ 250sec Burning and sparking time after secondary infection (t2 + t3) ≤ 30sec ≤ 60sec ≤ 60sec Combustion up to clamp (125 mm) No No No Ignition of cotton wool by dripping No No No

t1: burning time of the test body after the first contact

t2: Combustion time by contact infection for 10 seconds after combustion type by primary contact infection

t3: time for fire

Flame retardant test results

Sort Example Comparative Example 1 Comparative Example 2 Flame resistance  V0 Fail V1

Table 2 shows the results of the flame retardancy test, Figure 10 shows the results of the flame retardancy more quantitatively. As can be seen from Table 2 and Figure 10, the flame retardant adhesive composition according to the present invention was found to be the most excellent.

Therefore, the flame retardant adhesive composition and the concrete structure reinforcing method using the same according to the present invention are excellent in heat resistance and flame retardancy and thus are not harmful to the human body because the fire is prevented from spreading and the generation and release of harmful gases is prevented. Even when the adhesive is damaged there is an effect to prevent a sharp drop in the reinforcement of the concrete structure.

In addition, since the coefficient of thermal expansion of the adhesive is similar to that of concrete, the dropping of the reinforcement due to thermal behavior is prevented, so that the reinforcing effect of the concrete structure can be maintained for a long time.

The above-described examples and comparative examples are examples for explaining the present invention, but the present invention is not limited thereto. Those skilled in the art to which the present invention pertains will be capable of carrying out the present invention by various modifications therefrom, and the technical protection scope of the present invention should be defined by the appended claims.

Claims (6)

Epoxy resin 35.15 to 35.42% by weight, carbon nanotubes 26.72 to 26.94% by weight, polyimide 15.33 to 15.56% by weight, polymethylphenylsilsesquioxane 9.13 to 9.32% by weight, isocyanate 6.32 to 6.46 weight percent, 2.72 to 2.82 weight percent isoparaffin, and 4.10 to 4.24 weight percent silica; And a curing agent;
The flame-retardant adhesive composition is a flame-retardant adhesive composition for mixing the main body and the curing agent in a weight ratio of 1 to 5: 1.
The method of claim 1,
The curing agent is 83.92 to 84.27% by weight of cycloalipathic polyamine, 13.15 to 13.52% by weight of uranyl aectylacetonate, 1.34 to 1.48% by weight of polyether polyol, cobalt octoate (cobalt) octoate) flame retardant adhesive composition comprising 1.12 to 1.20% by weight.
delete Concrete surface treatment step of removing the deterioration layer and foreign matter on the surface of the concrete structure;
Applying a flame retardant adhesive to the concrete structure treated with the surface;
Reinforcing fiber sheet bonding step of adhering a reinforcing fiber sheet on the applied flame retardant adhesive; And
And a flame retardant adhesive impregnating step of impregnating the reinforcing fiber sheet with the flame retardant adhesive composition.
The flame-retardant adhesive is 35.15 to 35.42 wt% epoxy resin, 26.72 to 26.94 wt% carbon nanotube, 15.33 to 15.56 wt% polyimide, 9.13 to 9.32 wt% polymethylphenylsilsesuccioxane, 6.32 to 6.46 wt% isocyanate, 2.72 isoparaffin To 2.82% by weight and 4.10 to 4.24% by weight silica; And a curing agent comprising 83.92 to 84.27 weight percent of cycloaliphatic polyamine, 13.15 to 13.52 weight percent of uranyl acetylacetonate, 1.34 to 1.48 weight percent of polyether polyol, and 1.12 to 1.20 weight percent of cobalt octoate Way.
The method of claim 4, wherein
The flame-retardant adhesive impregnation step, the reinforcing fiber sheet 10 to 13 parts by weight of natural oil, 5 to 7 parts by weight of chitosan, 5 to 7 parts by weight of anthranilic acid based on 100 parts by weight of the flame retardant adhesive composition , 3 to 4 parts by weight of the acrylic resin, 1 to 2 parts by weight of the liquid rubber (liquid rubber) and 1 to 2 parts by weight of cerium oxide (cerium oxide).
Concrete surface treatment step of removing the deterioration layer and foreign matter on the surface of the concrete structure;
Applying a flame retardant adhesive to the concrete structure treated with the surface; And
And reinforcing fiber panel bonding step of bonding the reinforcing fiber panel on the applied flame retardant adhesive.
The flame-retardant adhesive is 35.15 to 35.42 wt% epoxy resin, 26.72 to 26.94 wt% carbon nanotube, 15.33 to 15.56 wt% polyimide, 9.13 to 9.32 wt% polymethylphenylsilsesuccioxane, 6.32 to 6.46 wt% isocyanate, 2.72 isoparaffin To 2.82% by weight and 4.10 to 4.24% by weight silica; And a curing agent comprising 83.92 to 84.27 weight percent of cycloaliphatic polyamine, 13.15 to 13.52 weight percent of uranyl acetylacetonate, 1.34 to 1.48 weight percent of polyether polyol, and 1.12 to 1.20 weight percent of cobalt octoate Way.

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