KR101749264B1 - Resin composition excellent in flame retardancy and reduced in gas harmfulness for reinforced concrete structures and panel including the same - Google Patents

Abstract

The present invention relates to a flame retardant resin composition comprising a flame retardant resin comprising a phenolic resin, a curing agent comprising a toluene sulfonic acid, a release agent and aluminum hydroxide, wherein the release agent comprises a first release agent comprising a fatty acid, polytriethanolamine and tall oil reaction product, A resin composition for repairing and reinforcing concrete structures comprising a second release agent containing phosphate, a third release agent comprising pentaerythritol ester fatty acid, and a fourth release agent comprising oxybispropanol, and a panel for repairing and reinforcing concrete structures using the same .

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a resin composition for repairing and reinforcing a concrete structure having excellent flame retardancy and reduced gas harmfulness, and a panel comprising the resin composition for repairing and reinforcing concrete structures,

The present invention relates to a resin composition for repair and reinforcement of a concrete structure having excellent flame retardancy and reduced gas toxicity, and a panel containing the resin composition.

Generally, concrete or reinforced concrete structures such as bridges, retaining walls, tunnels, underground parking lots in general apartments or buildings, and residential and building walls are subject to cracking, corrosion and peeling due to chemical corrosion, impact and seawater A phenomenon occurs. This leads to a reduction in durability and a reduction in the strength of concrete or reinforced concrete structures, and further collapse may occur, which may lead to serious disasters such as human casualties, so reinforcement work by reinforced panels is necessary in advance.

As a method of reinforcing a concrete structure, a method of reinforcing by using various fiber reinforcing members is generally known.

However, such a fiber reinforcing member usually uses an epoxy-based synthetic resin which is vulnerable to fire. Accordingly, there is a problem in that, when these members are used in multiple or reinforced concrete structures located in the basement, fire damage occurs due to early dropout and loss of the reinforcement .

In addition, the toxic gas generated in such a fire accident may lead to loss of life. In order to be used as a reinforcing member of a concrete structure, a flame retardant reinforcement which minimizes the generation of toxic gas when a fire occurs, Development of a member is urgent.

Furthermore, when reinforcing concrete structures are applied to the outer wall of a building, the surface quality of the reinforcing member must be taken into consideration in order to maintain the appearance of the building.

Therefore, in order to be useful for maintenance and reinforcement of concrete structures, it is required to develop members having excellent strength, flame retardancy and gas harmfulness, as well as excellent surface characteristics.

Embodiments of the present invention are to provide a resin composition for repair and reinforcement of a concrete structure having excellent strength, flame retardancy, and gas harmfulness, as well as excellent surface quality, and a panel comprising the resin composition.

In one aspect, the resin composition for repairing and reinforcing concrete structures according to the present invention comprises a flame retardant resin containing a phenol resin, a curing agent containing a toluene sulfonic acid, a release agent, and aluminum hydroxide, wherein the release agent comprises a fatty acid, And a first release agent comprising a tall oil reaction product, a second release agent comprising octylic acid phosphate, a third release agent comprising pentaerythritol ester fatty acid, and a fourth release agent comprising oxybispropanol.

In another aspect of the present invention, there is provided a panel for repairing concrete structures, comprising: a resin composition comprising a flame retardant resin including a phenol resin, a curing agent including toluene sulfonic acid, a release agent and aluminum hydroxide, a glass fiber impregnated in the resin composition, Wherein the release agent is selected from the group consisting of a first release agent comprising a fatty acid, a polythiethanolamine and a tall oil reaction product, a second release agent comprising octylic acid phosphate, a third release agent comprising a pentaerythritol ester fatty acid, And a second release agent.

The resin composition for repairing and reinforcing concrete structures according to the embodiments of the present invention and the panel including the same can be applied to repair and reinforcement of concrete structures in various fields because of excellent strength and flame retardancy and excellent surface quality.

1 is a photograph showing the surface appearance of a panel manufactured according to Example 1. Fig.
2A and 2B are photographs showing the results of a cracking test on the front and rear surfaces of the panel manufactured according to Comparative Example 1, respectively.
3 is a photograph showing the surface appearance of the panel produced according to Reference Example 1. Fig.
4 is a photograph showing the surface appearance of a panel produced according to Reference Example 2. Fig.
5 is a photograph showing the surface appearance of a panel manufactured according to Reference Example 3. Fig.
6 is a photograph showing the surface appearance of a panel manufactured according to Reference Example 4. Fig.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. The present invention may be embodied in many different forms and is not limited to the embodiments described herein.

In order to clearly illustrate the present invention, parts not related to the description are omitted, and the same or similar components are denoted by the same reference numerals throughout the specification.

In addition, since the sizes and thicknesses of the respective components shown in the drawings are arbitrarily shown for convenience of explanation, the present invention is not necessarily limited to those shown in the drawings.

Also, throughout the specification, when an element is referred to as "including" an element, it is understood that the element may include other elements as well, without departing from the other elements unless specifically stated otherwise.

The resin composition for repairing and reinforcing concrete structures according to one embodiment of the present invention comprises a resin containing phenol formaldehyde, a curing agent containing toluene sulfonic acid, a release agent, and aluminum hydroxide, and the first to fourth release agents And a control unit.

The first release agent may comprise a fatty acid, a polytriethanolamine and a tall oil reaction product. The first release agent is used for preventing the productivity during molding and the deformation of the panel when the panel is manufactured using the resin composition according to the present invention. The content of the first releasing agent may be 23 to 27 parts by weight based on 100 parts by weight of the releasing agent. When the content of the first release agent satisfies the above range, the color uniformity of the manufactured panel can be secured.

The second release agent may include octylic acid phosphate. The second release agent containing octylic acid phosphate serves to provide stability in a high-temperature mold in a process of drawing the panel using the resin composition according to the present invention. The content of the second releasing agent may be in the range of 43 to 47 parts by weight based on 100 parts by weight of the releasing agent. When the content of the second release agent satisfies the above-described range, even if a high-temperature mold is performed in the drawing process, no breakage due to friction or the like occurs, and generation of cracks or the like on the panel manufactured using the resin composition can be prevented have.

The third release agent may comprise pentaerythritol ester fatty acid. The third release agent is intended to prevent the productivity and the deformation of the panel when the panel is manufactured using the resin composition of the present invention like the first release agent. The content of the third release agent may be 23 to 27 parts by weight based on 100 parts by weight of the release agent. When the content of the first release agent satisfies the above range, the color uniformity of the manufactured panel can be secured.

The fourth release agent may include oxy bis propanol. The fourth release agent is intended to ensure high temperature stability and excellent surface appearance when a panel is manufactured using the resin composition of the present invention. The content of the fourth release agent may be 8 to 12 parts by weight based on 100 parts by weight of the release agent. When the content of the fourth release agent satisfies the above range, it is possible to manufacture a panel for repairing and reinforcing concrete structures having an excellent surface quality.

Therefore, in the resin composition for repairing and reinforcing a concrete structure according to the present invention, the content of the first to fourth mold release agents is preferably 23 to 27 parts by weight of the first release agent based on 100 parts by weight of the release agent, 43 to 47 parts by weight of the third release agent, 23 to 27 parts by weight of the third release agent, and 8 to 12 parts by weight of the fourth release agent.

On the other hand, the acid value of the release agent containing the first to fourth release agents may range from 1 mg-KOH / g to 2 mg-KOH / g. When a drawing process is carried out to produce a panel using the resin composition for repairing and reinforcing concrete structures according to one embodiment, a high temperature process is included. In terms of thermal stability, the acid value of the releasing agent preferably satisfies the above range .

The viscosity of the release agent may be in the range of 300 cP to 600 cP at 25 캜. When the viscosity of the release agent satisfies the above range, when the panel is manufactured using the resin composition for repairing and reinforcing concrete structures according to one embodiment, the drawing process can proceed smoothly.

The flame retardant resin including phenolic resin has characteristics such as heat resistance, flame retardancy, incombustibility, and low ductility, and is excellent in mechanical properties, so that the resin composition containing it as a main component is safe against fire. In the present invention, the flame retardant resin containing phenol resin may be, for example, one obtained by dissolving a phenol formaldehyde resin in a mixed solvent of phenol and water.

The flame retardant resin may include 72 to 78 parts by weight of phenol formaldehyde resin, 2 to 4 parts by weight of phenol and 20 to 24 parts by weight of water based on 100 parts by weight of the flame retardant resin.

When the flame retardant resin containing a phenol resin satisfies the above-described composition and content, the flame retardancy and the mechanical properties are excellent in the manifestation characteristics.

Next, the resin composition of the present invention comprises a curing agent comprising the toluene sulfonic acid. More specifically, the curing agent includes, for example, from 56 parts by weight to 68 parts by weight of toluene sulfonic acid, from 5 parts by weight to 10 parts by weight of an additive typically contained in the flame retardant resin composition, Parts by weight to 37 parts by weight.

Next, aluminum hydroxide imparts incombustibility to the resin composition for repairing and reinforcing concrete structures.

The resin composition for repairing and reinforcing concrete structures according to the present invention comprises 70 to 75% by weight of a flame retardant resin containing a phenol resin, 5 to 10% by weight of a curing agent containing toluene sulfonic acid, 9 wt.% To 12 wt.% Of a release agent, and 9 wt.% To 12 wt.% Of aluminum hydroxide.

When the content of each constitution contained in the resin composition satisfies the above range, it is possible to produce a panel having excellent strength and flame retardancy, as well as improved surface quality.

According to another embodiment of the present invention, there is provided a panel for repairing and reinforcing concrete structures, which comprises a resin composition comprising a flame retardant resin containing phenol resin, a curing agent containing toluene sulfonic acid, a release agent and aluminum hydroxide, , And glass mat.

Wherein the release agent is selected from the group consisting of a first release agent comprising a fatty acid, a polytriethanolamine and a tall oil reaction product, a second release agent comprising octylic acid phosphate, a third release agent comprising a pentaerythritol ester fatty acid, and a second release agent comprising oxybispropanol 4 release agent.

The concrete structure and characteristics of the resin composition for repairing and reinforcing concrete structures are the same as those described above, and thus will not be described here.

The glass fiber is used for securing the performance such as tensile strength, compressive strength, etc. of the panel for repairing and reinforcing the concrete structure and can be used without any limitations that are conventionally used in the art. The content of the glass mat may range from 25 wt% to 35 wt% based on 100 wt% of the panel. When the content of the glass fiber is too high, the resin composition may not be impregnated, and therefore, it is preferable to satisfy the above content range.

Next, the glass mat is for improving the tensile strength in the direction of the force of the panel for repairing and reinforcing the concrete structure, more specifically, for preventing the panel from being torn in one direction by weakening the tensile strength in the direction of force. The glass mat can be used without limitations that are conventionally used in the art. The content of the glass mat may range from 2.5 wt% to 7 wt% based on 100 wt% of the panel. In order to secure the quality of the panel, it is preferable that the glass mat is included in the above content range.

Accordingly, the panel for repairing and reinforcing concrete structures according to the present invention comprises 58 to 72.5 weight% of the resin composition, 25 to 35 weight% of the glass fiber, and 25 to 35 weight% of the glass mat 2.5 By weight to 7% by weight.

When the content of each component constituting the panel satisfies the above-mentioned range, it is possible to manufacture a panel having excellent strength and flame retardancy, as well as improved surface quality.

Hereinafter, the present invention will be described in detail with reference to examples.

Example  One

(1) Preparation of Resin Composition for Repairing and Reinforcing Concrete Structures

71.44% by weight of a flame retardant resin containing phenol resin, 10.71% by weight of a release agent, 10.71% by weight of a curing agent and 7.14% by weight of aluminum hydroxide were mixed to prepare a resin composition.

At this time, based on 100 parts by weight of the release agent, 25 parts by weight of a first release agent comprising a fatty acid, polytetriolamine and a tall oil reaction product, 45 parts by weight of a second release agent containing octylic acid phosphate, 20 parts by weight of a release agent, and 10 parts by weight of a fourth release agent containing oxybispropanol.

(2) Manufacture of panels for repair and reinforcement of concrete structures

62.09% by weight of the resin composition for repairing and reinforcing concrete structures prepared in (1) was wetted with 32.09% by weight of glass fiber and 5.53% by weight of glass mat. Thereafter, the impregnated raw material was cured at a high temperature in a mold apparatus, and then drawn and formed by pulling using a roller to produce a panel for repairing and reinforcing a concrete structure having a width of 400 m and a thickness of 3 m.

Then, the surface appearance of the panel produced according to Example 1 was observed.

1 is a photograph showing the surface appearance of a panel manufactured according to Example 1. Fig. Referring to Fig. 1, it can be seen that the panel manufactured according to Example 1 was manufactured so that the hues of the surface were uniform, and had a uniform and uniform surface. That is, it showed excellent surface properties.

Comparative Example  One

A panel was prepared in the same manner as in Example 1, except that a second release agent containing octylic acid phosphate was not used in the release agent.

Thereafter, the surface characteristics were measured and shown in Figs. 2A and 2B.

In the panel manufactured according to Comparative Example 1 which did not contain the second release agent, friction occurred due to the hot mold in the drawing process, and the drawing process was not smoothly performed.

That is, when the panel produced according to Comparative Example 1 was cooled and visually inspected, fine cracks were generated in the longitudinal direction, and a breaking phenomenon was observed in a weak force as a result of the breaking test. 2A and 2B are photographs showing that the panel manufactured according to Comparative Example 1 is cracked even at a weak force. 2A is a front view of the panel and FIG. 2B is a rear view of the panel.

Reference example  One

(1) was prepared in the same manner as in Example 1 except that the content of the fourth release agent containing oxybispropanol in the release agent was changed to 5 parts by weight and the second release agent containing octylic acid phosphate was mixed with 50 parts by weight of the release agent, Lt; / RTI >

Then, the surface characteristics were measured and shown in Fig.

The content of the fourth release agent was changed to 5 parts by weight based on 100 parts by weight of the total release agent, and the panel according to Reference Example 1 was caught by the mold apparatus, so that the drawing process was not smoothly performed,

3 is a photograph showing the surface appearance of the panel produced according to Reference Example 1. Fig. Referring to the blue display portion of FIG. 3, it can be seen that the surface is very rough, irregular, and stained.

Reference example  2

Except that a release agent comprising 40 parts by weight of the first release agent, 5 parts by weight of the second release agent, 30 parts by weight of the third release agent, and 25 parts by weight of the fourth release agent was used, based on 100 parts by weight of the release agent, .

4 is a photograph showing the surface appearance of a panel produced according to Reference Example 2. Fig. Referring to the blue display portion of FIG. 4, the panel manufactured according to Reference Example 2 has a problem in that a large number of bubbles are generated on the surface thereof, thereby deteriorating the surface quality.

Reference example  3

The same procedure as in Example 1 was carried out except that a releasing agent comprising 30 parts by weight of the first release agent, 30 parts by weight of the second release agent, 30 parts by weight of the third release agent and 10 parts by weight of the fourth release agent was used based on 100 parts by weight of the release agent .

5 is a photograph showing the surface appearance of a panel manufactured according to Reference Example 3. Fig. Referring to FIG. 5, it can be seen that the panel manufactured according to Reference Example 3 has a rough surface and unevenness in 1/3 of the center, resulting in surface defects due to uneven color.

Reference example  4

Except that a release agent comprising 30 parts by weight of the first release agent, 45 parts by weight of the second release agent, 20 parts by weight of the third release agent, and 5 parts by weight of the fourth release agent was used in place of 100 parts by weight of the release agent, .

6 is a photograph showing the surface appearance of a panel manufactured according to Reference Example 4. Fig. Referring to FIG. 6, the panel manufactured according to Reference Example 4 had a nonuniform hue in the middle of its surface, and the surface roughness became worse.

Experimental Example  1 - Strength testing

The panel prepared according to Example 1 was subjected to a tensile strength test according to the ASTM D638-14 method, and the results are shown in Table 1 below.

division The tensile strength speed Example 1 557 MPa 5mm / min

Referring to Table 1, it can be seen that the panel manufactured according to Example 1 exhibits a very high level because the tensile strength exceeds 500 MPa. This is 1.4 times better than 400 MPa, which is the tensile strength of the steel plate used as a repair and reinforcement panel of a conventional concrete structure. Therefore, it can be confirmed that the panel according to the present invention has excellent strength.

Experimental Example  2 - Flammability and Gas Hazard Test

The panels produced according to Example 1 were tested for flammability and are shown in Table 2.

The test method and conditions were as follows.

(1) Test method:

1) KS F ISO 5660-1: 2008,

2) KS F 2271: 2006

(2) Test environment:

1) Temperature: (23 ± 2),

2) Humidity: (50 ± 5)% R.H.

(3) Test Location: Reaction to fire test Laboratory

(4) Test result: Suitable for flame retardant materials (Ministry of Land, Transport and Communications Notice No. 2015-744)

division Example 1 standard Cone
Calorie meter Total heat released (MK / m ² ) 0.6 8 MK / m ² or less The time (sec) in which the heat release rate continuously exceeds 200 kW / m ² 0 Less than 10 seconds Changes in all melting, penetrating cracks and holes in the core clear There should be no cracks, holes and melting of core material. Gas hazard Average downtime (minutes: seconds) 13:45 More than 9 minutes

Referring to Table 2, it can be confirmed that the panel manufactured in accordance with Embodiment 1 meets the goodness criteria as a flame retardant material according to Notification No. 2015-744 of Ministry of Land, Transport and Tourism.

That is, the resin composition for repairing and reinforcing concrete structures according to one embodiment of the present invention and the panel for repairing and reinforcing concrete structures made using the resin composition have excellent surface quality while reducing the strength, flame retardancy, and gas harmfulness.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, And all changes to the scope that are deemed to be valid.

Claims (11)

A flame retardant resin including a phenol resin;
A curing agent comprising toluene sulfonic acid;
Release agent; And
Aluminum hydroxide,
The above-
A first release agent comprising a fatty acid, a polytriethanolamine and a tall oil reaction product,
A second release agent comprising octylic acid phosphate,
A third release agent comprising pentaerythritol ester fatty acid, and
A fourth mold release agent comprising oxy bis propanol
And a resin composition for repairing and reinforcing concrete structures.
The method according to claim 1,
Based on 100 parts by weight of the release agent,
25 parts by weight of the first release agent,
45 parts by weight of the second release agent,
20 parts by weight of the third release agent, and
10 parts by weight of the fourth release agent
And a resin composition for repairing and reinforcing concrete structures.
The method according to claim 1,
Wherein the acid value of the releasing agent is in the range of 1 mg-KOH / g to 2 mg-KOH / g.
The method according to claim 1,
Wherein the viscosity of the release agent ranges from 300 cP to 600 cP at 25 캜.
The method according to claim 1,
Based on the resin composition,
70% to 75% by weight of a flame retardant resin containing a phenol resin,
5% to 10% by weight of a curing agent comprising toluene sulfonic acid,
9% to 12% by weight of a release agent, and
Aluminum hydroxide 9 to 12%
And a resin composition for repairing and reinforcing concrete structures.
A flame retardant resin containing a phenol resin, a curing agent containing a toluene sulfonic acid, a release agent, and a resin composition containing aluminum hydroxide,
Glass fibers impregnated in the resin composition; And
A glass mat,
The above-
A first release agent comprising a fatty acid, a polytriethanolamine and a tall oil reaction product,
A second release agent comprising octylic acid phosphate,
A third release agent comprising pentaerythritol ester fatty acid, and
A fourth mold release agent comprising oxy bis propanol
And a reinforcing plate for reinforcing concrete structures.
The method according to claim 6,
On the basis of the concrete structure maintenance and reinforcement panel,
58 to 72.5% by weight of the resin composition;
25% to 35% by weight of the glass fiber; And
2.5 to 7% by weight of the glass mat,
And a reinforcing plate for reinforcing concrete structures.
The method according to claim 6,
Based on 100 parts by weight of the release agent,
25 parts by weight of the first release agent,
45 parts by weight of the second release agent,
20 parts by weight of the third release agent, and
10 parts by weight of the fourth release agent
And a reinforcing plate for reinforcing concrete structures.
The method according to claim 6,
Wherein the acid value of the release agent ranges from 1 mg-KOH / g to 2 mg-KOH / g.
The method according to claim 6,
Wherein the mold release agent has a viscosity ranging from 300 cP to 600 cP at 25 캜.
The method according to claim 6,
Based on the resin composition,
70% to 75% by weight of a flame retardant resin containing a phenol resin,
5% to 10% by weight of a curing agent comprising toluene sulfonic acid,
9% to 12% by weight of a release agent, and
Aluminum hydroxide 9 to 12%
And a reinforcing plate for reinforcing concrete structures.

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