KR101782894B1

KR101782894B1 - Polyurea resin composition

Info

Publication number: KR101782894B1
Application number: KR1020150121730A
Authority: KR
Inventors: 김태균
Original assignee: 주식회사 홍지
Priority date: 2015-08-28
Filing date: 2015-08-28
Publication date: 2017-09-28
Also published as: KR20170025380A

Abstract

The present invention is capable of rapid curing without catalyst and spraying and reinforcing it on the surface of a pillar member simply by strengthening the adhesion force with the pillar and without unnecessary interface and continuity can be achieved and the rigidity of the structure is increased in addition to excellent waterproofing performance Curing type polyurea resin composition for maximizing seismic performance and durability of a pillar member.
A preferred embodiment of the present invention is a hydrocarbon compound having a molecular weight of 1000 to 4000, which has at least one reactive "-OH" functional group and is a mixture of one or more of PPG, PTMG, PEG, PCD, (MDI), crude MDI, IPDI, HDI (Hexamethylene diisocyanate), H ₁₂ MDI, TDI (polyisocyanurate), and the like. 0.1 to 20% by weight of a powder of abrasive or ceramic powder and 0.1 to 20% by weight of a clay or silica, based on 100% by weight of a prepolymer formed by polymerization of isocyanate composed of one or more of the above- Is added and the curing agent compound, which is a compound having an active amine group (-NH2), is reacted at 20 to 90 占 폚.

Description

Technical Field [0001] The present invention relates to a polyurea resin composition for maximizing seismic performance and durability of a column member,

More particularly, the present invention relates to a novel curing-type polyurea resin composition for maximizing seismic performance and durability of a pillar member, and more particularly, Curing type polyurea resin composition for maximizing durability and seismic performance of a column member capable of adding continuity and having excellent waterproof performance and an increase in rigidity of the column member.

In recent years, there has been a growing demand for structural reinforcement of structures, especially column members, due to the structural strengthening and seismic regulations as well as structural repair and reinforcement due to high strength of existing structures and durability degradation due to environmental problems. In order to improve the repair and reinforcement of existing structural members and seismic performance, section elevation method or steel plate reinforcement method has been widely used. However, after 1990s, it has various advantages compared with other materials and construction methods The use of FRP reinforced method is increasing. As a result, a sealing method such as an epoxy resin sealing method, a method of injecting a grout material such as an epoxy adhesive and a method of reinforcing by using a putty material have been developed and used for repairing and reinforcing the structure.

Generally, a structure in an unreinforced state is exposed to the outside without any maintenance or reinforcement on the outside.

However, the most widely used method among existing structural reinforcement materials and construction methods is to apply epoxy coating to FRP sheet and to wrap it. Compared with other materials and construction method, construction is simple and performance is excellent. However, It is difficult to obtain a uniform quality because the reinforcing performance is determined, and the FRP material itself is mostly dependent on foreign countries, and thus the material cost is high. 3 (a), since the FRP sheet 2 composed of a single sheet is configured so as to surround the surface of the column member 10, the discontinuous surface (a) , There is a phenomenon in which the adhesive force is lowered by the use of the epoxy 1 and the workload at the time of construction of the workforce is limited.

As a background of the present invention, there is a patent registration No. 0708058 entitled " FRP panel for reinforcing concrete structures "(patent document 1). 4, an epoxy mortar composed of mixed fine aggregate and epoxy resin, which comprises upper and lower surfaces of a panel for reinforcing a reinforced concrete structure, Wherein the epoxy mortar is prepared by mixing fine silica fine particles with the silica fine particles No. 60 and No. 4 in a ratio of 1: 3 to prepare a mixture of fine aggregate , And the ratio of the epoxy resin to the mixed fine aggregate is 1: 4.

However, the above background art also has difficulties in securing a uniform quality because the reinforcing performance of the structure is determined according to the performance of the adhesive, and the FRP material itself depends largely on foreign countries and the material cost is high. There is a problem that a discontinuity at the end portion exists.

Patent No. 0708058, "FRP panel for reinforcing concrete structures"

The present invention has been made to solve the above problems and it is an object of the present invention to provide a noncatalyzed fast curing type gel having a gel time within 3 to 5 seconds after spraying so that it can be sprayed on slopes and vertical surfaces without flowing down, Since it is hardly influenced by water and temperature during the short construction, it can be easily applied to the column member to coat the surface of the column member to reinforce it. Since the coating is applied to the structure by quick curing immediately after spraying on the column member, Curing type polyurea resin composition for an excellent seismic performance and durability of a column member excellent in adhesion performance due to the absence of a discontinuity surface with the column member.

In addition, when the coating layer is formed by spraying on the pillar member, the strength of the pillar member is increased, so that it can be used for maintenance and reinforcement of the pillar member, and basically, it has excellent waterproof performance of the polyurea, Curing type polyurea resin composition for maximizing seismic performance and durability of a column member that can eliminate additional waterproof treatment.

The present invention relates to a hydrocarbon compound having a molecular weight of 1000 to 4000 and having at least one reactive "-OH" functional group and being a polyol composed of one or two or more of PPG, PTMG, PEG, PCD, And MDI, polymer MDI, crude MDI, IPDI, Hexamethylene diisocyanate (MDI), H ₁₂ MDI, TDI (Tolylene diisocyanate), and the like, which have at least one "-NCO" an additive comprising 0.1 to 20% by weight of a powder of abrasive or ceramic powder and 0.1 to 20% by weight of clay or silica based on 100% by weight of a prepolymer formed by polymerization of isocyanate composed of one or more of modified MDI And a curing agent compound which is a compound having an active amine group (-NH 2) is reacted at 20 to 90 ° C to produce a seismic performance and a durability for maximizing durability To provide a polyurea-type resin composition.

Also, the additive may further include 0.1 to 20 wt% of a flame retardant material, which is a halogen compound or a phosphate compound, to further improve seismic performance and durability of the pillar member. .

Also, the additive is further mixed with 0.1 to 10 wt% of an anti-neutralization agent based on 100 wt% of the prepolymer. The present invention provides a novel polyurea resin composition for maximizing seismic performance and durability of a pillar member.

Also, the present invention provides 0.1 to 10 wt% of an ultraviolet stabilizer based on 100 wt% of the prepolymer, and further, the present invention provides a quick cure type polyurea resin composition for maximizing durability and seismic performance of a pillar member.

In order to solve the above problems, the present invention provides a quick cure type polyurea resin composition for maximizing seismic performance and durability of a column member of the present invention, which is a noncatalyzed fast curing type and has a gel time within 3 to 5 seconds after spraying Because it can be sprayed without slipping down on slopes and vertical surfaces, it is very short in touching time of 30 seconds or less, so it is hardly influenced by water and temperature during construction. Therefore, Since the coating is applied to the structure by rapid curing immediately after spraying on the column member, the adhesion performance is excellent and there is no discontinuity surface with the column member, so that the adhesion performance is excellent.

In addition, when the coating layer is formed by spraying on the pillar member, the strength of the pillar member is increased, so that it can be used for maintenance and reinforcement of the pillar member, and basically, it has excellent waterproof performance of the polyurea, There is a very useful effect that an additional waterproof treatment can be excluded.

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate exemplary embodiments of the invention and, together with the description, serve to explain the principles of the invention, Shall not be construed as limiting.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view and a cross-sectional view of an embodiment of repair and reinforcement of a structure using a quick-setting type polyurea resin composition for maximizing seismic performance and durability of a column member of the present invention.
Fig. 2 is a graph showing the performance test results of the column specimens.
3 is a perspective view and a sectional view of one embodiment of a structure reinforced with a conventional FRP,
4 is a cross-sectional view showing the structure of a conventional FRP panel for reinforcing concrete structures.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the embodiments shown in the accompanying drawings, but the present invention is not limited thereto.

Hereinafter, the technical structure of the present invention will be described in detail with reference to the preferred embodiments.

As shown in Fig. 1 (a), the quick cure type polyurea resin composition for maximizing the seismic performance and durability of the column member of the present invention is sprayed on the surface of the column member 10 to repair and reinforce it, As shown in Fig. 1 (b), by directly spraying onto the surface of the column member 10, there is no unnecessary interface, continuity can be ensured without disconnection, economical and easy installation, In addition to the excellent waterproof performance of the polyurea excellent in corrosion and the effect of corrosion, the increase in the rigidity, which has been pointed out as a disadvantage of the conventional polyurea resin, can be realized.

The quick cure type polyurea resin composition for maximizing the seismic performance and durability of the column member of the present invention is a hydrocarbon compound having a molecular weight of 1000 to 4000, which has at least one reactive "-OH" functional group and is composed of polypropylene glycol (PPG), polytetramethylene polyols composed of one or more of glycol, polyethylene glycol, PCL, polycarbonatediol, and polybutadiene, and a polyol having one or more "-NCO" functional groups , MDI (polymeric methylenediphenyl diisocyanate), crude MDI, IPDI (isophorone diisocyanate), HDI (hexamethylene diisocyanate), H ₁₂ MDI (4,4'dicyclohexylmethane diisocyanate), TDI (Tolylene diisocyanate) based on 100w% of a prepolymer formed by polymerization of isocyanate composed of one or more of modified MDI, By weight of a curing agent compound which is a compound having an active amine group (-NH2) and an additive comprising 0.1 to 20% by weight of an alumina and 0.1 to 20% by weight of clay or silica in an amount of 0.1 to 20% by weight.

The polyurea applied to the present invention is a polyurea (urea, polyurea), an elastomer derived from a reaction product of an isocyanate component and a synthetic resin mixed component, and in particular, Reaction of urea, and reaction of diamine with diisocyanic acid.

Speed curing type polyurea resin composition for maximizing the seismic performance and durability of the column member of the present invention Since it has a gel time within 3 to 5 seconds after spraying, it can be sprayed without slipping on the slope face and vertical face of the column member It has a touch tact time of less than 30 sec. It is hardly influenced by water and temperature during construction. It has wide construction temperature range from -40 to + 135 ℃ and is less influenced by climate change, moisture, heat, There are advantages.

Generally, a polyurea resin is produced by reacting a prepolymer formed by polymerization of a polyol and isocyanate with a curing agent compound having an amine group at 20 to 90 ° C to form a polyurea.

At this time, an additive is mixed with a prepolymer or a curing agent compound, and then a prepolymer and a curing agent compound are reacted to prepare a polyurea.

Isocyanate is a compound having at least one "-NCO" functional group and is a compound having at least one functional group such as MDI (Methylenediphenyl diisocyanate), polymeric MDI (polymeric isocyanate), crude MDI, IPDI, HDI (Hexamethylene diisocyanate), H ₁₂ MDI, TDI ), modified MDI, etc., and the polyol is a hydrocarbon compound having a molecular weight of 1000 to 4000, which has at least one reactive "-OH" functional group, and is composed of PPG, PTMG, PEG, PCD, PCL, poly BD, and the like.

For use in concrete structures, the viscosity should be controlled according to the environment of the structures and places used. In order to control the viscosity, a solvent may be used.

The solvents are toluene, xylene, Methyl ethyl ketone, acetone, ethanol, methanol, IPA (isopropyl alcohol), isopropyl alcohol, DMF, NMP, THF, DMAC (N, N-Dimethylacetamide), Anon (Cyclohexanone) and PC (polycarbonate) are used.

The curing agent compound is a mixture of compounds having at least one functional group, which is composed of a compound having an active amine group (D-2000, T-5000, DETDA, unilink-4200, etc.). An isocyanate having an amine group (-NH ₂ ) and an isocyanate group (-NCO) forms an urea bond by an addition polymerization reaction. The amine group-containing compound is used as a curing agent because the amine component reacts with the isocyanate component or is cured to form a polyurea.

The additive is composed of 0.1 ~ 20w% of the abrasive or ceramic powder and 0.1 ~ 20w% of the clay or silica based on 100w% of the prepolymer.

The addition of less than 0.1w% has little effect on the strength increase, while the addition of more than 20w% inhibits the continuity of the polyurea. It may be easily broken. Therefore, it is added in the range of 0.1 to 20 wt%.

It is preferable that the powder of stone powder and the ceramic powder are powdered to the same standard so as to exhibit uniform strength to the polyurea resin.

The powder of the stone and the ceramic is added to powder of powdered 100 mesh to 10,000 mesh to be used according to the condition of the column member to be reinforced. Too thick particles may interfere with the continuity of the polyurea resin and may not exhibit uniform strength over the entire surface after the repair or reinforcement of the column member. Therefore, it is necessary to add and prepare powders having a size of 100 mesh to 10,000 mesh desirable.

Clay or silica, so that the surface adhesive force of the concrete or the steel having a low surface adhesive force can be made high so as not to be separated from the column member after the application to the surface of the column member.

The clay may be selected from any of a variety of clays known in the art, and in particular, montmorillonite clay, kaolin clay, atepulgite clay and / or sepiolite clay may be used.

The clay is less than 0.1w%, and when it is mixed, the adhesive strength is lowered, and when it exceeds 20w%, the strength is lowered when mixing, so it is preferable that the clay is mixed in the range of 0.1 to 20w%.

When the amount of silica is less than 0.1w%, the adhesive strength is lowered. When the amount of silica exceeds 20w%, the viscosity is too strong to be mixed with the silica. Therefore, the silica is preferably mixed in the range of 0.1 to 20w%.

The flame retardant material is constituted in order to secure fire stability and is added in the range of 0.1 to 20w% based on 100w% of the prepolymer, and phosphorous compound or halogen compound is used.

Commonly used flame retardant materials are classified into halogen (Halogen) compound and phosphoric acid based compound and additive type (non-reactive type) and reactive type products. The halogen-based flame-retardant material is flame-retarded in the gaseous state of atoms and molecules by combustion. The phosphorus flame retardant material is subjected to dehydrogenation / dehydration reaction by combustion to form a carbonized layer.

When the flame retardant material is added in an amount of less than 0.1w%, the flame retardant effect is not exhibited. When the flame retardant material is added in an amount of more than 20w%, the effect of adding the flame retardant material is not exhibited.

In order to prevent the carbonation of the concrete column member, the additive may further contain 0.1 to 10 wt% of an antifoaming agent based on 100 wt% of the prepolymer.

Neutralization inhibitors are added to prevent oxidation or neutralization of concrete column members. Concrete neutralization inhibitors are organic-based resin-based or inorganic-based modified silicate-based materials, and the same series of materials are used.

Cured concrete is a hydration product of cement containing hydrated lime and exhibits strong alkalinity. With the passage of time, hydrated lime is gradually affected by the air from the concrete surface into carbonated lime and loses its alkalinity. This phenomenon is called concrete neutralization.

When the amount of the neutralizing agent is less than 0.1 wt%, the effect of preventing oxidation or neutralization is not exhibited. If the amount of the neutralizing agent is more than 10 wt%, the effect of the neutralizing agent is not exhibited and the whitening phenomenon may appear on the surface. . &Lt; / RTI >

In order to prevent discoloration due to external exposure, 0.1 to 10 wt% of an ultraviolet stabilizer may be further added to the additive based on 100 wt% of the prepolymer.

As the polyurea is exposed to the outside, yellowing may occur due to ultraviolet rays. Therefore, an additional UV stabilizer is added.

The ultraviolet stabilizer may be selected from ultraviolet absorbers, quenchers, peroxide release agents, radical scavengers, ultraviolet screening agents, and the like, or may be selectively used in combination.

UV absorbers act to block or reduce ultraviolet absorption. Hydroxybenzophenone and hydroxybenzotriazole are the most frequently used ultraviolet absorbers. Benzophenone has good compatibility with polyolefin during processing. The benzotriazole system has a strong ultraviolet absorption ability in the region of 280 to 390 nm and has a large absorption up to the visible ray region boundary and has a higher ultraviolet absorption capacity than benzophenone.

Qunchers act more slowly than ultraviolet absorbers and absorb excess energy from chromophore excited by ultraviolet absorption to convert them to a bottom state and emit them as heat energy, fluorescence or phosphorescence.

Hydroperoxide decomposer acts on unstable hydrogen peroxide (ROOH) which is generated during decomposition by ultraviolet rays, and converts it into a substance free of polymers (ROH).

Radical scavenger removes the free radicals generated by ultraviolet decomposition and stops the reaction. In addition, it is effective for thin products because of its excellent surface protecting action. It can produce synergy effect when it is used in combination with ultraviolet absorber or quencher without imparting coloring unlike the quencher.

In UV screeners, pigments used in opaque products act as ultraviolet light blocking agents, and most inorganic pigments such as carbon black and phthalocyanine blue improve ultraviolet stability.

Fig. 2 is a graph showing the performance test results of the column specimens.

The rapid curing type polyurea resin composition for the seismic performance and durability of the column member of the present invention was applied to the column specimen and the performance test was conducted.

The specimens were 15.5 mm in diameter and 57.5 mm in length, and were subjected to loading tests. The results are shown in Table 1 and FIG. 2.

Specimens Load (kN) D (mm) L (mm) Remarks One Control 278 15.5

57.5

Non-reinforced specimen 2 P3 323 3mm application of polyurea 3 P5 392 5mm polyurea application 4 P7 410 Polyurea 7mm application 5 CF 374 Carbon fiber reinforcement 6 CFP3 456 3mm application of polyurea after carbon fiber reinforcement

As shown in Fig. 2, specimens coated with polyurethane 5 mm and 7 mm were found to have a fracture at the center portion, and polyurethane coated on the outside of the specimen at the time of fracture The specimen is completely attached to the specimen and the fracture site is constrained.

In addition, the carbon fiber reinforcement, the carbon fiber reinforcement, and the polyurea application specimen showed that the upper end portion of the specimen was broken due to the failure of the carbon fiber to completely adhere to the specimen.

In order to solve the above-mentioned problems, the present invention provides a novel fast cure type polyurea resin composition for maximizing seismic performance and durability of a column member of the present invention as described above. Because it has time, it can spray on slope and vertical surface without flowing down. It is very short as touching time is less than 30 seconds, so it is hardly influenced by water and temperature during construction. It can be reinforced. Since the coating is applied to the structure by rapid curing immediately after spraying on the column member, the adhesion performance is excellent and there is no discontinuity surface with the column member, so that the adhesion performance is excellent.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is evident that many alternatives, modifications and variations will be apparent to those skilled in the art in light of the above teachings. will be. The invention is not limited by these variations and modifications, but is limited only by the claims appended hereto.

1: Epoxy
2: FRP sheet
10: Structure
20: Polyurea resin
a: discontinuity

Claims

(PPG), polytetramethylene glycol (PTMG), polyethylene glycol (PEG), polycaprolactone (PCL), polycarbonatediol (PCD), polycarbonate (PCD), and the like, having at least one reactive "-OH" A polyol composed of one or a mixture of two or more of BD (polybutadiene)
"-NCO" MDI (Methylenediphenyl diisocyanate) a functional group as a compound having at least one, polymeric MDI (polymeric Methylenediphenyl diisocyanate) , crude MDI, IPDI (Isophorone diisocyanate), HDI (Hexamethylene diisocyanate), H 12 MDI (4,4 ' based on 100w% of a prepolymer formed by polymerization of isocyanate composed of one or more of dicyclohexylmethane diisocyanate, TDI (Tolylene diisocyanate), and modified MDI,
0.1 to 20 wt% of clay or silica, 0.1 to 20 wt% of clay or silica, 0.1 to 10 wt% of an anti-neutralization agent and 0.1 to 10 wt% of an ultraviolet stabilizer are further mixed,
Characterized in that a curing agent compound having an active amine group (-NH 2) is reacted at 20 to 90 ° C to produce a quencher-type polyurea resin composition for maximizing seismic performance and durability of a column member.

The method according to claim 1,
Wherein the additive is further mixed with 0.1 to 20 wt% of a flame retardant material which is a halogen compound or a phosphate compound based on 100 wt% of the prepolymer. Polyurea resin composition.

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