KR102551114B1 - Polyurea composite coating layer for ductile reinforcement of concrete and steel structure - Google Patents

Abstract

The present invention relates to a resin composition for reinforcing structures, and specifically, for reinforcing structures capable of improving ductility reinforcing ability and realizing waterproof performance by adjusting the components of a polyurea compound included in the resin composition and the weight ratio of each component. It relates to a resin composition.

Description

Polyurea composite coating layer for ductile reinforcement of concrete and steel structures

The present invention relates to a polyurea composite coating layer for ductile reinforcing of concrete and steel structures. It relates to a polyurea composite coating layer for soft reinforcement of concrete and steel structures that can be realized.

It is common to form a coating layer by applying polyurea for waterproofing of concrete structures and/or steel structures.

However, conventional polyurea has a tensile strength of 20 MPa, so it has a problem of low strength as a reinforcing material to be used as a reinforcing material for concrete structures and / or steel structures.

Therefore, in order to manufacture polyurea that can serve as a reinforcing material, it is necessary to develop a technology capable of continuously exhibiting waterproof performance, which is a basic function of polyurea, while increasing tensile strength more than conventional polyurea.

The technical problem to be achieved by the present invention is to improve the tensile strength by adjusting the components and weight ratio of the polyurea-based compound included in the coating layer, and to provide a polyurea composite coating layer for ductile reinforcement of concrete and steel structures that can combine waterproofness will be.

However, the problem to be solved by the present invention is not limited to the above-mentioned problem, and other problems not mentioned will be clearly understood by those skilled in the art from the following description.

An exemplary embodiment of the present invention is a first layer comprising a first polyurea-based compound; and a second layer provided on the first layer and including a second polyurea-based compound, wherein the first polyurea-based compound is a reaction product of a first main component composition and a first curing agent component composition, The second polyurea-based compound provides a polyurea composite coating layer for reinforcing ductility of concrete and steel structures, which is a reaction product of the second main component composition and the second curing agent component composition.

According to an exemplary embodiment of the present invention, the first main part composition includes 70 wt% or more and 75 wt% or less of a first isocyanate-based compound, 20 wt% or more and 30 wt% or less of a first polyol-based compound, and 1 wt% or more It may contain 5% by weight or less of organic additives.

According to an exemplary embodiment of the present invention, the first curing agent composition includes 40 wt% or more and 50 wt% or less of a primary amine-based compound, 5 wt% or more and 10 wt% or less of a primary secondary amine-based compound, 40 wt% % or more and 50 wt% or less of a chain extender, 0.5 wt% or more and 1.0 wt% or less of an adhesion increasing agent, 0.5 wt% or more and 1.0 wt% or less of a UV additive, and 1.0 wt% or more and 5.0 wt% or less of a first toner it may be

According to an exemplary embodiment of the present invention, the second main part composition may include 80% by weight or more and 95% by weight or less of the second isocyanate-based compound and 5% by weight or more and 15% by weight or less of the second polyol-based compound. .

According to an exemplary embodiment of the present invention, the second curing agent composition includes 1% by weight or more and 10% by weight or less of a secondary amine compound, 70% by weight or more and 80% by weight or less of a third polyol-based compound, and 0.5% by weight % or more and 1.0 wt% or less of the catalyst, 5 wt% or more and 10 wt% or less of the moisture absorbent, and 1 wt% or more and 4 wt% or less of the second toner.

According to an exemplary embodiment of the present invention, the content of the isocyanate group of the first polyurea-based compound is 18% by weight or more and 21% by weight or less, and the content of the isocyanate group of the second polyurea-based compound is 22% by weight or more 25% by weight It may be less than the weight percent.

The polyurea composite coating layer for ductile reinforcing of concrete and steel structures according to one embodiment of the present invention can improve the strength of the structure and realize waterproofness.

1 is a schematic diagram of a polyurea composite coating layer for ductile reinforcement of concrete and steel structures according to an exemplary embodiment of the present invention.
Figure 2 is a result of testing the physical properties of the first layer made of the first polyurea-based compound of Preparation Example 1.
Figure 3 is the result of testing the physical properties of the first layer made of the second polyurea-based compound of Preparation Example 2.
Figure 4 is a graph showing the strain according to the stress of the compression test of Comparative Examples 1 to 4 and Example 1.
5 is a photograph of Comparative Examples 1 to 4 and Example 1 before and after the compression test.
6 is a graph showing the cumulative energy dissipation according to the strain of Comparative Examples 1 to 4 and Example 1.
7 is a graph showing the ductility of Comparative Examples 2 to 4 and Example 1.

In order to fully understand the configuration and effects of the present disclosure, preferred embodiments of the present disclosure will be described with reference to the accompanying drawings. However, the present disclosure is not limited to the embodiments disclosed below, and may be implemented in various forms and various changes may be made. Hereinafter, in the description of the present invention, detailed descriptions thereof will be omitted if it is determined that the related known functions may unnecessarily obscure the subject matter of the present invention as obvious matters to those skilled in the art.

Terms such as first and second may be used to describe various components, but the components should not be limited by the terms. The terms may only be used for the purpose of distinguishing one component from another. For example, a first element may be termed a second element, and similarly, a second element may be termed a first element, without departing from the scope of the present disclosure.

In this application, the terms "include" or "have" are intended to designate that there is a feature, number, step, operation, component, part, or combination thereof described in the specification, but one or more other features It should be understood that the presence or addition of numbers, steps, operations, components, parts, or combinations thereof is not precluded.

Terms used in this application are only used to describe specific embodiments and are not intended to limit the present invention. Singular expressions include plural expressions unless the context clearly dictates otherwise. Terms used in the embodiments of the present disclosure may be interpreted as meanings commonly known to those skilled in the art unless otherwise defined.

Throughout the present specification, when a member is said to be located “on” another member, this includes not only a case where a member is in contact with another member, but also a case where another member exists between the two members.

Throughout the present specification, the unit "parts by weight" may mean the ratio of the weight of each component. Throughout this specification, “A and/or B” may mean “A and B, or A or B”.

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

An exemplary embodiment of the present invention is a first layer comprising a first polyurea-based compound; and a second layer provided on the first layer and including a second polyurea-based compound, wherein the first polyurea-based compound is a reaction product of a first main component composition and a first curing agent component composition, The second polyurea-based compound provides a polyurea composite coating layer for reinforcing ductility of concrete and steel structures, which is a reaction product of the second main component composition and the second curing agent component composition.

The polyurea composite coating layer for ductile reinforcing of concrete and steel structures according to one embodiment of the present invention can improve the tensile strength of the structure and realize waterproofness.

1 is a schematic diagram of a coating layer 100 for concrete and steel structures according to an exemplary embodiment of the present invention. Referring to FIG. 1, the polyurea composite coating layer 100 for ductility reinforcement of concrete and steel structures according to an exemplary embodiment of the present invention will be described in detail.

According to an exemplary embodiment of the present invention, the polyurea composite coating layer 100 for ductility reinforcement of concrete and steel structures includes a first layer 110 including a first polyurea-based compound; includes As described above, the polyurea composite coating layer 100 for ductile reinforcement of concrete and steel structures includes a first layer 110 including a first polyurea-based compound, thereby ductile reinforcement of concrete and steel structures. It is possible to improve the ductility of the polyurea composite coating layer and realize waterproofness.

According to an exemplary embodiment of the present invention, the polyurea composite coating layer 100 for ductility reinforcement of concrete and steel structures is provided on the first layer 110 and is a second layer including a second polyurea-based compound. (130). As described above, the polyurea composite coating layer 100 for ductile reinforcement of concrete and steel structures is provided on the first layer 110 and includes a second layer 130 including a second polyurea-based compound. By doing so, it is possible to improve the tensile strength of the polyurea composite coating layer for ductile reinforcing of the concrete and steel structures, and implement waterproofness.

Meanwhile, according to another embodiment, the polyurea composite coating layer for ductile reinforcing of concrete and steel structures includes a second layer 130 including a second polyurea-based compound; and a first layer 110 provided on the second layer 130 and including a first polyurea-based compound. At this time, the first polyurea-based compound and the second polyurea-based compound are the same as in one embodiment, so detailed descriptions thereof are omitted.

According to one embodiment of the present invention, concrete and steel structures may be disposed on the lower surface of the first layer 110 . That is, it may be a structure in which the first layer 110 and the second layer 130 are sequentially stacked on the upper surface of the concrete and steel structure. Also, according to another embodiment of the present invention, concrete and steel structures may be disposed on the upper surface of the second layer 130 . At this time, it may be a structure in which the second layer 130 and the first layer 110 are sequentially stacked on the upper surface of the concrete and steel structure.

According to an exemplary embodiment of the present invention, the first polyurea-based compound is a reaction product of the first main component composition and the first curing agent component composition. As described above, the first polyurea-based compound is a reaction product of the first main component composition and the first curing agent component composition, thereby improving the elongation rate of the polyurea composite coating layer for ductility of the concrete and steel structures. there is.

According to an exemplary embodiment of the present invention, the volume ratio of the first main component composition and the first curing agent component composition may be 2:1 to 1:2. Preferably, the volume ratio of the first main component composition and the first curing agent component composition may be 1:1. The curing speed of the first polyurea-based compound may be controlled by adjusting the volume ratio of the first main component composition and the first curing agent component within the above range.

According to an exemplary embodiment of the present invention, the first main part composition may include 70% by weight or more and 75% by weight or less of the first isocyanate-based compound. Specifically, the content of the first isocyanate-based compound may be 71 wt% or more and 74 wt% or less, or 72 wt% or more and 73 wt% or less. As described above, by including the first isocyanate-based compound and adjusting the content of the first isocyanate-based compound within the above-described range, the physical properties of the polyurea composite coating layer for ductility of the concrete and steel structures are adjusted, and the 1 The degree of polymerization of polyurea-based compounds can be controlled.

According to an exemplary embodiment of the present invention, the first isocyanate-based compound is 4,4-methylene diphenyl diisocyanate, methylenediphenyl diisocyanate, polymethylene poly It may be one selected from the group consisting of phenyl isocyanate (Polymethylene Polyphenyl isocyanate) and combinations thereof. By selecting the first isocyanate-based compound from the above, it is possible to adjust the physical properties of the polyurea composite coating layer for ductility of the concrete and steel structures.

According to an exemplary embodiment of the present invention, the first main part composition may include 20% by weight or more and 30% by weight or less of the first polyol-based compound. Specifically, the content of the first polyol-based compound may be 21 wt% or more and 29 wt% or less, 22 wt% or more and 28 wt% or less, 23 wt% or more and 27 wt% or less, or 24 wt% or more and 26 wt% or less. As described above, by including the first main part composition and adjusting the content of the first polyol-based compound within the above-described range, the physical properties of the polyurea composite coating layer for ductility of the concrete and steel structures are adjusted, and the 1 The degree of polymerization of polyurea-based compounds can be controlled.

According to an exemplary embodiment of the present invention, the first polyol-based compound may be one selected from polypropylene glycol, polyether polyol, and combinations thereof. By selecting the first polyol-based compound from the above, it is possible to adjust the physical properties of the polyurea composite coating layer for ductility of the concrete and steel structures.

According to an exemplary embodiment of the present invention, the first main component composition may include an organic additive of 1% by weight or more and 5% by weight or less. Specifically, the content of the organic additive may be 2 wt% or more and 4 wt% or less, or 2 wt% or more and 3 wt% or less. As described above, by including the organic additive and adjusting the content of the organic additive within the above-described range, the physical properties of the polyurea composite coating layer for ductility of the concrete and steel structures are adjusted, and the first polyurea-based compound The degree of polymerization can be adjusted.

According to an exemplary embodiment of the present invention, the organic additive may be one selected from propylene carbonate, 1-chloro-2-propanol phosphate, and combinations thereof. By selecting the organic additive from the above, it is possible to adjust the physical properties of the polyurea composite coating layer for ductility of the concrete and steel structures.

According to an exemplary embodiment of the present invention, the first curing agent composition may include a primary amine-based compound in an amount of 40% by weight or more and 50% by weight or less. Specifically, the content of the primary amine compound may be 41 wt% or more and 49 wt% or less, 42 wt% or more and 48 wt% or less, 43 wt% or more and 47 wt% or less, or 44 wt% or more and 46 wt% or less. As described above, by including the primary amine-based compound and adjusting the content of the primary amine-based compound within the above-described range, the physical properties of the polyurea composite coating layer for ductility reinforcement of the concrete and steel structures are adjusted, and the waterproofness can improve

According to an exemplary embodiment of the present invention, the primary amine-based compound may be polyether amine. As described above, by selecting polyether amine as the primary amine compound, it is possible to adjust the physical properties of the polyurea composite coating layer for ductility reinforcement of concrete and steel structures.

According to an exemplary embodiment of the present invention, the molecular weight of the primary amine-based compound may be 400 g/mol or more and 5,000 g/mol or less. Specifically, the molecular weight of the primary amine compound is 500 g / mol or more and 4,500 g / mol or less, 1,000 g / mol or more and 4,000 g / mol or less, 1,500 g / mol or more and 3,500 g / mol or less, or 2,000 g / mol or more 3,000 It may be less than g / mol. By adjusting the molecular weight of the primary amine-based compound within the above-mentioned range, it is possible to adjust the physical properties of the polyurea composite coating layer for ductility reinforcement of concrete and steel structures.

According to an exemplary embodiment of the present invention, the first curing agent part composition may include 5% by weight or more and 10% by weight or less of the first secondary amine-based compound. Specifically, the content of the first secondary amine-based compound may be 6% by weight or more and 9% by weight or less, or 7% by weight or more and 8% by weight or less. As described above, the polymerization reaction for forming the first polyurea-based compound can be implemented by including the first secondary amine-based compound and adjusting the content of the first secondary amine-based compound within the above-described range. It is possible to adjust the physical properties of the polyurea composite coating layer for ductile reinforcing of the concrete and steel structures, and improve waterproofness.

According to an exemplary embodiment of the present invention, the first secondary amine-based compound may be diethyltoluene diamine. As described above, by selecting diethyltoluene diamine as the first secondary amine-based compound, physical properties of the polyurea composite coating layer for ductility reinforcement of concrete and steel structures can be adjusted.

According to an exemplary embodiment of the present invention, the first curing agent part composition may include 40% by weight or more and 50% by weight or less of a chain extender. Specifically, the content of the chain extender may be 41 wt% or more and 49 wt% or less, 42 wt% or more and 48 wt% or less, 43 wt% or more and 47 wt% or less, or 44 wt% or more and 46 wt% or less. As described above, by including the chain extender and adjusting the content of the chain extender within the above range, the molecular weight of the first polyurea-based compound is controlled, and the polyurea for ductility reinforcement of concrete and steel structures It is possible to adjust the physical properties of the composite coating layer and improve waterproofness.

According to an exemplary embodiment of the present invention, the chain extender is 4,4-methylenebis (N- (1-methylpropyl) benzenamine) it could be As described above, by selecting 4,4-methylenebis (N-(1-methylpropyl)benzenamine) as the chain extender, it is possible to adjust the physical properties of the polyurea composite coating layer for ductility reinforcement of concrete and steel structures. , It is possible to control the molecular weight of the first polyurea-based compound.

According to an exemplary embodiment of the present invention, the first curing agent part composition may include 0.5% by weight or more and 1.0% by weight or less of an adhesion increasing agent. Specifically, the content of the adhesion increasing agent may be 0.6 wt% or more and 0.9 wt% or less, or 0.7 wt% or more and 0.8 wt% or less. As described above, by including the adhesion increasing agent and adjusting the content of the adhesion increasing agent within the above-described range, the adhesion of the first polyurea-based compound is improved, and the polyurea for ductility of concrete and steel structures is reinforced. It is possible to adjust the physical properties of the composite coating layer and improve waterproofness.

According to an exemplary embodiment of the present invention, the adhesion increasing agent may be one selected from glycidoxy propyl trimethoxy silane, trimethoxy silane, and combinations thereof. From the above, by including the adhesion increasing agent, it is possible to improve the adhesion of the first polyurea-based compound.

According to an exemplary embodiment of the present invention, the first curing agent part composition may include a UV additive of 0.5% by weight or more and 1.0% by weight or less. Specifically, the content of the UV additive may be 0.6 wt% or more and 0.9 wt% or less, or 0.7 wt% or more and 0.8 wt% or less. As described above, by including the UV additive and adjusting the content of the UV additive within the above range, it is possible to prevent the first layer from being denatured by ultraviolet rays.

According to an exemplary embodiment of the present invention, the UV additive is N-(4-ethoxycarbonylphenyl)-N`-methyl-N`phenyl formamidine (N-(4-Ethoxy carbonyl phenyl)-N'- Methyl-N'-Phenyl formamidine, bis(1,2,3,6,6,-petamethyl-4-piperidinyl) sebacate (Bis(1,2,2,6,6-pentamethyl-4- piperidinyl) sebacate) and combinations thereof. By selecting the UV additive from the above, it is possible to prevent the first layer from being denatured by ultraviolet rays.

According to an exemplary embodiment of the present invention, the first curing agent part composition may contain the first toner in an amount of 1.0% by weight or more and 5.0% by weight or less. Specifically, the content of the first toner may be 2.0 wt% or more and 4.0 wt% or less, or 2.0 wt% or more and 3.0 wt% or less. As described above, by including the first toner and adjusting the content of the first toner within the above range, the first layer may have an additional function of adjusting color or removing fine dust.

According to an exemplary embodiment of the present invention, the first toner may be one selected from carbon black, titanium dioxide, and combinations thereof. By selecting the first toner from the above, the first layer may be given an additional function of adjusting color or removing fine dust.

According to one embodiment of the present invention, the tensile strength of the first layer may be 30 MPa or more. Specifically, the tensile strength of the first layer may be 30 MPa or more and 39 MPa or less. As described above, by adjusting the tensile strength of the first layer, it is possible to improve the compressive strength of the concrete and steel structures.

According to one embodiment of the present invention, the elongation rate according to the tensile strength of the first layer may be 50% or more and 200% or less. The tensile strength may be 30 MPa or more. As described above, by implementing the elongation rate according to the tensile strength of the first layer, it is possible to improve the ductility reinforcing effect.

According to one embodiment of the present invention, the second polyurea-based compound is a reaction product of the second main part composition and the second curing agent part composition. As described above, the second polyurea-based compound is used as a reaction product of the second main component composition and the second curing agent component composition, thereby improving the tensile strength of the polyurea composite coating layer for ductility of the concrete and steel structures. can make it

According to an exemplary embodiment of the present invention, the volume ratio of the second main component composition and the second curing agent component composition may be 2:1 to 1:2. Preferably, the volume ratio of the second main component composition and the second curing agent component composition may be 1:1. The curing speed of the second polyurea-based compound may be controlled by adjusting the volume ratio of the second main component composition and the second curing agent component within the above range.

According to an exemplary embodiment of the present invention, the second main part composition may include 80% by weight or more and 95% by weight or less of the second isocyanate-based compound. Specifically, the content of the second isocyanate-based compound is 81 wt% or more and 94 wt% or less, 82 wt% or more and 93 wt% or less, 83 wt% or more and 92 wt% or less, 84 wt% or more and 91 wt% or less, 85 It may be more than 90% by weight, less than 86% by weight and less than 89% by weight, or more than 87% by weight and less than 88% by weight. As described above, by including the second isocyanate-based compound and adjusting the content of the second isocyanate-based compound within the above-described range, the physical properties of the polyurea composite coating layer for ductility of the concrete and steel structures are adjusted, The degree of polymerization of the second polyurea-based compound may be adjusted.

According to an exemplary embodiment of the present invention, the second isocyanate-based compound is 4,4-methylene diphenyl diisocyanate, methylenediphenyl diisocyanate, polymethylene poly It may be one selected from the group consisting of phenyl isocyanate (Polymethylene Polyphenyl isocyanate) and combinations thereof. By selecting the second isocyanate-based compound from the above, it is possible to adjust the physical properties of the polyurea composite coating layer for ductility of the concrete and steel structures.

According to an exemplary embodiment of the present invention, the second main part composition may include a second polyol-based compound in an amount of 5% by weight or more and 15% by weight or less. Specifically, the content of the second polyol-based compound may be 6 wt% or more and 14 wt% or less, 7 wt% or more and 13 wt% or less, 8 wt% or more and 12 wt% or less, or 9 wt% or more and 11 wt% or less. As described above, by including the second polyol-based compound and adjusting the content of the second polyol-based compound within the above-described range, the physical properties of the polyurea composite coating layer for ductility of the concrete and steel structures are adjusted, The degree of polymerization of the second polyurea-based compound may be adjusted.

According to an exemplary embodiment of the present invention, the second polyol-based compound may be one selected from polypropylene glycol, polyether polyol, and combinations thereof. By selecting the second polyol-based compound from the above, it is possible to adjust the physical properties of the polyurea composite coating layer for ductility of the concrete and steel structures.

According to an exemplary embodiment of the present invention, the second curing agent part composition may include a second secondary amine-based compound of 1% by weight or more and 10% by weight or less. Specifically, the content of the second secondary amine compound may be 2 wt% or more and 9 wt% or less, 3 wt% or more and 8 wt% or less, 4 wt% or more and 7 wt% or less, or 5 wt% or more and 6 wt% or less. there is. As described above, by including the second secondary amine-based compound and adjusting the content of the second secondary amine-based compound within the above-described range, the physical properties of the polyurea composite coating layer for ductility reinforcement of concrete and steel structures It can be adjusted and the tensile strength can be improved.

According to an exemplary embodiment of the present invention, the second secondary amine-based compound may be diethyltoluene diamine. As described above, by selecting diethyltoluene diamine as the second secondary amine-based compound, physical properties of the polyurea composite coating layer for ductility reinforcement of concrete and steel structures can be adjusted.

According to an exemplary embodiment of the present invention, the second curing agent part composition may include 70% by weight or more and 80% by weight or less of the third polyol-based compound. Specifically, the content of the third polyol-based compound may be 71 wt% or more and 79 wt% or less, 72 wt% or more and 78 wt% or less, 73 wt% or more and 77 wt% or less, or 74 wt% or more and 76 wt% or less. there is. As described above, by including the third polyol-based compound and adjusting the content of the third polyol-based compound within the above-described range, the physical properties of the polyurea composite coating layer for ductility of the concrete and steel structures are adjusted, The degree of polymerization of the second polyurea-based compound may be adjusted.

According to an exemplary embodiment of the present invention, the third polyol-based compound may be one selected from polypropylene glycol, polyether polyol, and combinations thereof. By selecting the third polyol-based compound from the above, it is possible to adjust the physical properties of the polyurea composite coating layer for ductility of the concrete and steel structures.

According to an exemplary embodiment of the present invention, the molecular weight of the third polyol-based compound may be 400 g/mol or more and 6,000 g/mol or less. Specifically, the molecular weight of the third polyol-based compound is 500 g/mol or more and 4,500 g/mol or less, 1,000 g/mol or more and 4,000 g/mol or less, 1,500 g/mol or more and 3,500 g/mol or less, or 2,000 g/mol or more and 3,000 g/mol or more. It may be less than g / mol. By adjusting the molecular weight of the third polyol-based compound within the above-described range, the physical properties of the polyurea composite coating layer for ductility of the concrete and steel structures can be adjusted, and the degree of polymerization of the second polyurea-based compound can be controlled.

According to an exemplary embodiment of the present invention, the second curing agent composition may include a catalyst in an amount of 0.5% by weight or more and 1.0% by weight or less. Specifically, the content of the catalyst may be 0.2 wt% or more and 0.4 wt% or less, or 0.2 wt% or more and 0.3 wt% or less. As described above, the polymerization reaction rate of the second polyurea-based compound may be controlled by including the catalyst and adjusting the content of the catalyst within the above-described range.

According to one embodiment of the present invention, the catalyst is 28% Sn Octoate (Octoate containing Sn at 28% by weight), 24% Pb Octoate (Octoate containing Pb at 24% by weight), 9% Bi Octoate (9% by weight) Octoate containing Bi by weight %) and combinations thereof. By selecting the catalyst from the above, it is possible to control the polymerization reaction rate of the second polyurea-based compound.

According to an exemplary embodiment of the present invention, the second curing agent part composition may include a moisture absorbent of 5% by weight or more and 10% by weight or less. Specifically, the content of the moisture absorbent may be 6% by weight or more and 9% by weight or less, or 7% by weight or more and 8% by weight or less. As described above, by including the moisture absorbent and adjusting the content of the moisture absorbent within the above range, it is possible to prevent physical properties from being changed due to moisture in the air during the coating layer formation process.

According to an exemplary embodiment of the present invention, the moisture absorbent may be a silica-based powder. Specifically, the moisture absorbent may be Silipolite powder from CECA. By selecting the moisture absorbent as described above, it is possible to prevent physical properties from being changed by moisture in the air during the coating layer formation process.

According to an exemplary embodiment of the present invention, the second curing agent composition may include the second toner in an amount of 1% by weight or more and 4% by weight or less. Specifically, the content of the second toner may be 2% by weight or more and 3% by weight or less. As described above, by including the second toner and adjusting the content of the second toner within the above range, the second layer may have an additional function of adjusting color or removing fine dust.

According to an exemplary embodiment of the present invention, the second toner may be one selected from carbon black, titanium dioxide, and combinations thereof. By selecting the second toner from the above, the first layer can be given an additional function of adjusting color or removing fine dust.

According to an exemplary embodiment of the present invention, the second curing agent composition may further include an antifoaming agent. The antifoaming agent may be BYK-A530 from BYK. As described above, by further including the antifoaming agent, bubbles of the second curing agent part composition may be removed.

According to an exemplary embodiment of the present invention, the content of the isocyanate group of the first polyurea-based compound may be 18% by weight or more and 21% by weight or less. Specifically, the content of the isocyanate group of the first polyurea-based compound may be 19% by weight or more and 20% by weight or less. By adjusting the isocyanate group content of the first polyurea-based compound within the above-described range, the strength of the first coating layer may be improved.

According to an exemplary embodiment of the present invention, the content of the isocyanate group of the second polyurea-based compound may be 22% by weight or more and 25% by weight or less. Specifically, the content of the isocyanate group of the second polyurea-based compound may be 23% by weight or more and 24% by weight or less. By adjusting the content of the isocyanate group of the second polyurea-based compound within the above-described range, the strength of the second coating layer may be improved.

According to one embodiment of the present invention, the tensile strength of the second layer may be 40 MPa or more. Specifically, the tensile strength of the second layer may be 40 MPa or more and 55 MPa or less. As described above, by adjusting the tensile strength of the second layer, the compressive strength of the concrete and steel structures can be improved.

According to one embodiment of the present invention, the elongation rate according to the tensile strength of the second layer may be 1% or more and 30% or less. The tensile strength may be 30 MPa or more. As described above, by implementing the elongation rate according to the tensile strength of the second layer, it is possible to improve the ductility reinforcing effect.

According to one embodiment of the present invention, the first layer has a tensile strength of 30 MPa or more and 39 MPa or less, and an elongation of 50% or more and 200% or less, and the second layer is 40 MPa It may have a tensile strength of 55 MPa or less, and an elongation of 1% or more and 30% or less. As the tensile strength of the paint for reinforcement increases, the reinforcement strength increases as the elongation rate decreases, and brittle fracture of the paint may occur. Therefore, by simultaneously using the first layer and the second layer having tensile strength and elongation within the above ranges, it is possible to improve reinforcing strength and prevent brittle fracture at the same time.

Hereinafter, examples will be described in detail to explain the present invention in detail. However, embodiments according to the present invention can be modified in many different forms, and the scope of the present invention is not construed as being limited to the embodiments described below. The embodiments herein are provided to more completely explain the present invention to those skilled in the art.

<Production Example 1>

72% by weight of 4,4-Methylene diphenyl Diisocyanate as the first isocyanate-based compound, 25% by weight of polypropylene glycol as the first polyol-based compound, and propylene as an organic additive A first main component composition was prepared by mixing 3% by weight of carbonate.

Thereafter, 42% by weight of polyether amine (molecular weight 3,000 g/mol) as a primary amine compound, 8% by weight of diethyltoluene diamine as a primary amine compound, and 4,4-methylenebis (N-( 1-methylpropyl)benzenamine) 45% by weight, glycidoxypropyltrimethoxysilane 1% by weight as an adhesion enhancer, N-(4-ethoxycarbonylphenyl)-N`-methyl-N`phenyl as a UV additive Formamidin (N-(4-Ethoxy carbonyl phenyl)-N'-Methyl-N'-Phenyl formamidine) 1% by weight, a mixture of carbon black and titanium dioxide as a first toner (1: 1 weight ratio) 3 weight A first curing agent part composition was prepared by mixing %.

Thereafter, the first main component composition and the first curing agent component composition were mixed in a 1:1 volume ratio to prepare a first polyurea-based compound having an isocyanate group content of 20% by weight.

<Production Example 2>

90% by weight of 4,4-Methylene diphenyl Diisocyanate as the second isocyanate-based compound and 10% by weight of polypropylene glycol as the second polyol-based compound are mixed to form the second subject A sub-composition was prepared.

Thereafter, 8% by weight of diethyltoluene diamine as a first secondary amine compound, 75% by weight of propylene glycol as a third polyol compound, 1% by weight of 28% Sn Octoate as a catalyst, and 8% by weight of Silipolite powder (CECA) as a moisture absorbent A second curing agent part composition was prepared by mixing 5% by weight of BYK-A530 (BYK) as a defoaming agent and 3% by weight of a mixture (1:1 weight ratio) of a mixture of carbon black and titanium dioxide as a second toner.

Thereafter, the second main component composition and the second curing agent component composition were mixed in a 1:1 volume ratio to prepare a second polyurea-based compound having an isocyanate group content of 23% by weight.

Figure 2 is a result of testing the physical properties of the first layer made of the first polyurea-based compound of Preparation Example 1. Referring to FIG. 2, the tensile strength of the first layer made of the first polyurea-based compound of Preparation Example 1 is 36 MPa, and the elongation is 137%, and has a tensile strength of 30 MPa or more and 39 MPa or less. , it was confirmed that it had an elongation of 50% or more and 200% or less. Figure 3 is the result of testing the physical properties of the first layer made of the second polyurea-based compound of Preparation Example 2. Referring to FIG. 3, the tensile strength of the first layer made of the second polyurea-based compound of Preparation Example 2 is 52 MPa, and the elongation is 1.5%, and has a tensile strength of 40 MPa or more and 55 MPa or less. , it was confirmed that it had an elongation of 1% or more and 30% or less.

<Example 1>

A cylindrical circular specimen made of concrete having a diameter of 100 mm and a height of 200 mm was prepared, and the surface of the circular specimen was coated with the first polyurea-based compound prepared in Preparation Example 1 to obtain a first layer having a thickness of 2 mm. and coating the second polyurea-based compound prepared in Preparation Example 2 on the first layer to form a second layer having a thickness of 3 mm to form a coating layer.

<Comparative Example 1>

In Example 1, only a circular specimen was prepared without a coating layer.

<Comparative Example 2>

In Comparative Example 1, the thickness of the coating layer was formed to 5 mm with a polyurea paint (SC-PU3590, manufactured by AP TECH) having a tensile strength of the mid to high 20 MPa range.

<Comparative Example 3>

In Comparative Example 1, the surface of the round specimen was coated with the first polyurea-based compound prepared in Preparation Example 1 to form a coating layer having a thickness of 5 mm.

<Comparative Example 4>

In Comparative Example 1, the surface of the round specimen was coated with the second polyurea-based compound prepared in Preparation Example 2 to form a coating layer having a thickness of 5 mm.

<Test Example 1: Compression test>

The strain of Example 1 and Comparative Examples 1 to 4 was confirmed while changing the compressive force using a large frame structure tester (JKS Co.).

<Test Example 2: Cumulative energy dissipation measurement>

Based on the compression test results of Example 1 and Comparative Examples 1 to 4, the accumulated energy dissipation was measured by calculating the stress-strain as an area.

<Test Example 3: Measurement of ductility>

For Example 1 and Comparative Examples 1 to 4, the ductility was calculated by the ratio of the yield displacement (Δ y) and the ultimate displacement (Δ max) as shown in Equation 1 below based on the compression test results, the yield displacement Means the intersection point where the load corresponding to 75% of the maximum load capacity and the curve meet, and the ultimate displacement means the displacement corresponding to 85% after the load reduction starts after the maximum load capacity is reached.

[Equation 1]

Ductility = △ max / △ y = ultimate displacement / yield displacement

Figure 4 is a graph showing the strain according to the stress of the compression test of Comparative Examples 1 to 4 and Example 1. 5 is a photograph of Comparative Examples 1 to 4 and Example 1 before and after the compression test. Referring to FIGS. 4 and 5, it was confirmed that Comparative Example 1 had a maximum stress of about 23 MPa and fracture occurred at a strain of about 0.0025.

Comparative Example 2 is a polyurea having a tensile strength of about 20 MPa, and the maximum stress is about 25 MPa, and the curve tends to elongate after the maximum stress, which confirms that the ductility reinforcing effect of absorbing input energy is seen.

Comparative Example 3 is a polyurea with a tensile strength of 30 MPa to 39 MPa, and the maximum stress is about 31 MPa, and the curve tends to elongate after the maximum stress, and the area of the curve is larger than that of Comparative Example 2, which absorbs energy. It was confirmed that the higher the , the higher the toughness.

Comparative Example 4 is a polyurea with a tensile strength of 40 MPa to 55 MPa, and the maximum stress is about 33 MPa, and the curve tends to stretch after the maximum stress. Compared to Comparative Example 3, the maximum stress is higher, but the area of the curve is small. It was confirmed that the toughness was lower because the absorbed energy was lower.

Example 1 has a maximum stress of about 31.5 MPa, and a tendency to elongate the curve after the maximum stress can be seen, and the area of the curve is larger than that of Comparative Example 3, and it was confirmed that the toughness is higher because the energy absorbed is higher.

Therefore, Comparative Example 2 has a ductility effect, but the ductility reinforcing ability is lower than that of Comparative Example 3, and the maximum stress of Comparative Example 4 is increased, but the ductility reinforcing ability is lower than that of Comparative Example 3. However, it can be seen that Example 1 has an excellent ductility reinforcing effect compared to Comparative Examples 2 to 4, and the ductility reinforcing effect can be realized in the reinforcement of structures and the like.

6 is a graph showing the cumulative energy dissipation according to the strain of Comparative Examples 1 to 4 and Example 1. The energy dissipation capacity of a building is the ability of a structure to absorb external energy such as an earthquake, which is one of the important indicators in evaluating the seismic performance of a building. Cumulative energy dissipation amounts of Comparative Examples 1 to 4 and Example 1 are shown in Table 1 below.

Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Example 1 Cumulative energy dissipation (unit: MPa mm) 0.030 0.183 0.447 0.407 0.489

Referring to FIG. 6 and Table 1, it was confirmed that the cumulative energy dissipation amount of Example 1 was improved compared to Comparative Examples 1 to 4.

7 is a graph showing the ductility of Comparative Examples 2 to 4 and Example 1. In buildings, ductility is one of the important indicators in evaluating seismic performance as an element that effectively resists earthquake loads and serves to prevent brittle fracture of structures. The ductility of Comparative Examples 1 to 4 and Example 1 is shown in Table 2 below.

Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Example 1 ductility - 1.988 3.129 3.163 11.751

Referring to FIG. 7 and Table 2, it was confirmed that the ductility of Example 1 was improved compared to Comparative Examples 2 to 4.

Therefore, the polyurea composite coating layer for ductility reinforcement of concrete and steel structures, which is an embodiment of the present invention, improves compression test, cumulative energy dissipation and ductility, so that it can be used as a reinforcing material for concrete and steel structures.

100: coating layer
110: first layer
130: second layer

Claims (6)

A first layer comprising a first polyurea-based compound; And a second layer provided on the first layer and including a second polyurea-based compound,
The first polyurea-based compound is a reaction product of a first main part composition and a first curing agent part composition,
The second polyurea-based compound is a reaction product of the second main part composition and the second curing agent part composition,
The first layer has a tensile strength of 30 MPa or more and 39 MPa or less, and an elongation of 50% or more and 200% or less,
The second layer has a tensile strength of 40 MPa or more and 55 MPa or less, and an elongation of 1% or more and 30% or less,
The second curing agent component composition includes 1% by weight or more and 10% by weight or less of a secondary amine compound, 70% by weight or more and 80% by weight or less of a third polyol-based compound, and 0.5% by weight or more and 1.0% by weight or less of a catalyst, A polyurea composite coating layer for reinforcing ductility of concrete and steel structures, comprising 5 wt% or more and 10 wt% or less of a moisture absorbent and 1 wt% or more and 4 wt% or less of a second toner.
The method of claim 1,
The first main part composition includes 70 wt% or more and 75 wt% or less of a first isocyanate-based compound, 20 wt% or more and 29 wt% or less of a first polyol-based compound, and 1 wt% or more and 5 wt% or less of an organic additive. is to do,
The organic additive is a polyurea composite coating layer for soft reinforcement of concrete and steel structures, which is one selected from propylene carbonate, 1-chloro-2-propanol phosphate, and combinations thereof.
The method of claim 1,
The first curing agent part composition contains 40 wt% or more and 50 wt% or less of a primary amine compound, 5 wt% or more and 10 wt% or less of a primary secondary amine compound, 40 wt% or more and 50 wt% or less of a chain extension ductility of concrete and steel structures comprising an adhesion increasing agent of 0.5 wt% or more and 1.0 wt% or less, a UV additive of 0.5 wt% or more and 1.0 wt% or less, and a first toner of 1.0 wt% or more and 5.0 wt% or less Polyurea composite coating layer for reinforcement.
The method of claim 1,
The second main part composition is a polyurea for ductility reinforcement of concrete and steel structures comprising 80% by weight or more and 95% by weight or less of a second isocyanate-based compound and 5% by weight or more and 15% by weight or less of a second polyol-based compound. composite coating layer.
delete The method of claim 1,
The content of the isocyanate group of the first polyurea-based compound is 18% by weight or more and 21% by weight or less,
The content of the isocyanate group of the second polyurea-based compound is 22% by weight or more and 25% by weight or less, a polyurea composite coating layer for ductile reinforcement of concrete and steel structures.

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