KR20160012531A - Coating materials for sea equipment repair and reinforce - Google Patents

Abstract

The present invention relates to a repair and reinforcement material for ocean facilities, which can prevent corrosion and damage of a reinforced concrete of the ocean facilities due to moisture and salt according to inflow of continuous waves and stream water, by being coated on a surface of all sorts of underwater structures like a breakwater, a wharf and a bridge. The repair and reinforcement material for the ocean facilities by the present invention forms a coating layer on the surface of the ocean facilities by being constituted by mixing a prepolymer 53~60 wt%, a hardening agent 5~14 wt%, a cross-linking agent 10~19 wt%, an additive 6~10 wt%, a foaming agent 6~15 wt%, a pigment 2~5 wt% and a UV stabilizer 3~6 wt%.

Description

{Coating materials for sea equipment repair and reinforce}

The present invention relates to a method for repairing and reinforcing marine facilities to prevent corrosion and destruction of reinforced concrete of marine facilities due to continuous salinity or moisture caused by continuous wave or river inflow by applying to the surfaces of various underwater structures such as breakwaters, It is about the material.

Various kinds of marine facilities and structures such as breakwater and coastal bridges installed on the roads near the sea, breakwater, wharf facilities and other offshore structures and structures are subject to repeated irrigation water inflows, wave and tidal impacts in the event of a typhoon or tsunami, Or cracks and cracks on the surface of the concrete, the penetration of sea breeze or seawater seriously corrodes the reinforcing bar, resulting in the collapse of the structures.

In order to ensure the safety of offshore facilities caused by corrosion or cracking of marine structures due to seawater, they are regularly repaired.

Document 1: Korean Intellectual Property Office, Registered Patent Publication No. 10-0403128, "Wet-curable polyurethane repair composition of no-form formulation and method for repairing and reinforcing cracks of concrete or steel structure using the same" Document 2: Korean Intellectual Property Office, Registered Patent Publication No. 10-0959691, "Urethane foam composition and method for restoring structural reinforcement using the same"

The present invention has been made in order to solve the above problems, and various kinds of facilities installed on the roads adjacent to the sea such as a bridge or a coastal bridge, various marine facilities and structures such as a breakwater and a wharf facility, It is an object of the present invention to provide a material for repair and reinforcement of an offshore facility which can prevent the surface of a reinforced concrete of an offshore facility from being damaged or cracked due to the impact of waves and tides.

In order to achieve the above object, the material for repairing and reinforcing marine facilities according to the present invention comprises 53 to 60 wt% of prepolymer, 5 to 14 wt% of a curing agent, 10 to 19 wt% of a crosslinking agent, 6 to 10 wt% of an additive, To 15 wt% of the pigment, 2 to 5 wt% of the pigment and 3 to 6 wt% of the UV stabilizer are mixed to form a coating layer on the surface of the marine facility.

At this time, the prepolymer is characterized in that MDI as an isocyanate and ether-based PPG as a polyol are reacted.

The curing agent is characterized in that a diisocyanate compound is mixed and reacted with an MDI monomer, MDI dimer, MDI trimer, Polymeric MDI, MDI prepolymer and aliphatic tertiary diamide compound as a main component.

The crosslinking agent may be either MOCA or NDI.

Further, the additive is characterized in that any one or more of stone powder, calcium carbonate, clay, Pb-octoate, defoamer, inorganic salt, clay and glass fiber is mixed.

The material for repairing and reinforcing marine facilities of the present invention having the above structure is excellent in flame resistance and airtightness, and can be used for various facilities installed on roads adjacent to the sea such as a bridge or a coastal bridge and various marine facilities such as a breakwater, The surface of the marine facilities is not cracked due to the high rebound resilience even when the influx of the river water and repeated impacts of the river and tide when the typhoon or tsunami occur, Corrosion by seawater does not occur.

In addition, when the surface of the marine facility in which cracking or corrosion has already occurred is coated and coated with the material of the present invention as a finishing agent, cracking or corrosion of marine facilities can be prevented in advance.

And it is cured rapidly after coating on the surface of marine facilities, so it has an excellent workability.

Hereinafter, materials for repairing and reinforcing marine facilities according to the present invention will be described in detail.

The repairing and reinforcing materials for the marine facilities according to the present invention are composed of 53 to 60 wt% of PPG based prepolymer, 5 to 14 wt% of a curing agent, 16 to 19 wt% of a crosslinking agent, 6 to 10 wt% of an additive, 6 to 15 wt% of a foaming agent, And 3 to 6 wt% of uv.

Polypropylene glycol (PPG) based prepolymer is composed of MDI as an isocyanate and ether PPG which is excellent in hydrolysis property and low temperature property as a polyol.

The PPG-based prepolymer having the above-described structure has an elongation and an elastic modulus by the polyol forming the soft segment, and the isocyanate which forms the hard segment has excellent mechanical properties at low temperature and excellent hydrolysis resistance.

When the PPG based prepolymer is mixed with less than 53 wt% of the PPG based prepolymer, the PPG based prepolymer is mixed with the PPG based prepolymer in an amount of 53 to 60 wt%. When the PPG based prepolymer is mixed with less than 53 wt%, the PPG based prepolymer exhibits the elongation, PPG based prepolymer is mixed with PPG based prepolymer in an amount of more than 60 wt%, the effect of increasing the physical properties is insignificant. However, since the production cost is excessive and the hardenability is lowered, Is preferably mixed with 53 to 60 wt%.

And 5 to 14 wt% of the curing agent is mixed.

The curing agent is prepared by mixing and reacting MDI monomer, MDI dimer, MDI trimer, Polymeric MDI, MDI prepolymer and aliphatic tertiary diamide compound as a main component of a diisocyanate compound.

When the amount of the curing agent is less than 5 wt%, the strength of the coating layer is lowered and the curability is lowered, resulting in poor workability. When the amount exceeds 14 wt%, the strength of the coating layer is lowered It is preferable to mix 5 to 14 wt% of the curing agent.

The cross-linking agent is mixed with 10 to 19 wt%. By mixing the cross-linking agent, the material for repair and reinforcement of marine facilities exhibits excellent hydrolysis-resistant elastomer characteristics, excellent mechanical properties, and good chemical resistance and heat resistance.

MOCA (ortho-chloroaniline) or 1,5-naphtahlene diisocyanate (NDI) is used as the crosslinking agent.

When the cross-linking agent is mixed in an amount of less than 16 wt%, various characteristics caused by mixing the cross-linking agent can not be expected. When the cross-linking agent is mixed in more than 19 wt%, the elongation and elasticity properties of the PPG based prepolymer are lowered The crosslinking agent is preferably mixed in the range of 16 to 19 wt%.

The additive is mixed with 6 ~ 10 wt%.

The additive is added to increase various physical properties of the coating layer. When an inorganic powder such as stone powder, calcium carbonate, or white clay is added, the weatherability of the coating layer is increased. When a catalyst such as Pb-octoate is added, An antifoaming agent for preventing the formation of bubbles in the coating layer can be added, inorganic salts, clay, and glass fiber can be added for heat resistance and flame retardancy, and a precipitation inhibitor, a dispersant and the like can be added.

And 6 to 15 wt% of the foaming agent are mixed.

The foaming agent foams the coating layer applied on the surface of the marine facilities, and the coating layer is fused to the irregular surface of the marine facilities by the foaming of the coating layer, and the polyurethane foam foamed in the minute cracks on the surface of the marine facilities is filled, To prevent further crack propagation and corrosion.

In addition, in the process of foam foaming, the foaming agent is vaporized by reaction heat and exists in a gaseous state in the foam to exhibit an excellent heat insulating effect and lower the viscosity of the liquid raw liquid to improve workability by improving workability such as flowability do.

When the blowing agent is mixed at less than 6 wt%, the workability for application to the surface of a vertical type of marine facilities is lowered and the foaming is not properly performed. If the foaming agent is mixed in an amount exceeding 15 wt%, the elasticity of the coating layer is lowered, so that the impact of the wave can not be absorbed and the viscosity becomes too low, which causes the workability to be lowered rather.

And 2 ~ 5wt% of pigments are mixed so that the surface color of the marine facilities can be expressed in various colors.

In order to prevent corrosion of the coating layer due to ultraviolet rays of the sun, 3 to 6 wt% of UV stabilizer is mixed.

The material for repair and reinforcement of the marine facilities of the present invention having the above-described structure may include various facilities installed on the roads adjacent to the sea such as a bridge or a coastal bridge, and the marine facilities of the present invention on the surface of various marine facilities such as a breakwater, , Coating material of reinforcement material is coated, and cracks do not occur on the surface of the marine facilities due to high rebound elasticity even in the inflow of river water and repetitive underwater and tidal impacts when typhoon or tsunami occurs, Does not occur.

And the strength of the coating layer is excellent, so that it is not easily broken even when the wave is continuously inflowed.

PPG based prepolymer
(wt%) Hardener
(wt%) Cross-linking agent
(wt%) additive
(wt%) blowing agent
(wt%) Pigment
(wt%) UV stabilizer
(wt%) compression
burglar
(MPa) Seal
burglar
(MPa) Example 1 58 10 15 6 6 2 3 2.2 5.8 Example 2 58 12 13 6 6 2 3 2.5 5.9 Example 3 58 14 11 6 6 2 3 2.6 5.8 Example 4 56 10 17 6 6 2 3 2.1 5.6 Example 5 56 12 15 6 6 2 3 2.3 5.7 Example 6 56 14 13 6 6 2 3 2.2 5.6 Example 7 54 10 19 6 6 2 3 2.0 5.2 Example 8 54 12 17 6 6 2 3 2.1 5.4 Example 9 54 14 15 6 6 2 3 2.0 5.3 Comparative Example 1 56 4 18 10 7 2 3 1.9 4.7 Comparative Example 2 56 17 10 6 6 2 3 1.9 4.8 Comparative Example 3 65 12 6 6 6 2 3 1.7 5.0

- PPG Based prepolymer: Prepolymer prepared by reacting 4,4-di-pheny-methane diisocyanate (MDI) with polypropylene glycol

- Hardener: MDI monomer

- Cross-linking agent: MOCA (ottho-chloroaniline)

- Additive: Pb-octoate (catalyst) and antifoaming agent in a weight ratio of 1: 2

- foaming agent: C-pentane

- Measurement method: Korea Industrial Standard KSF4923: 2005

As shown in Table 1, in Examples 1 to 9 of the present invention, the compressive strength exceeded 2.0 MPa and the tensile strength exceeded 5.0 MPa, while Comparative Examples 1 to 3 exhibited excellent compressive strength The strength was 2.0 MPa or less, and the tensile strength was 5.0 MPa or less.

The material for repairing and reinforcing marine facilities of the present invention having the above structure is excellent in flame resistance and airtightness, and can be used for various facilities installed on roads adjacent to the sea such as a bridge or a coastal bridge and various marine facilities such as a breakwater, The surface of the marine facilities is not cracked due to the high rebound resilience even when the influx of the river water and repeated impacts of the river and tide when the typhoon or tsunami occur, Corrosion by seawater does not occur.

In addition, when the surface of the marine facility in which cracking or corrosion has already occurred is coated and coated with the material of the present invention as a finishing agent, cracking or corrosion of marine facilities can be prevented in advance.

And it is cured rapidly after coating on the surface of marine facilities, so it has an excellent workability.

The materials for repairing and reinforcing marine facilities according to the present invention have been described above.

It will be understood by those skilled in the art that the technical features of the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof.

Therefore, it should be understood that the above-described embodiments are to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than the foregoing description, Ranges and equivalents thereof are to be construed as being included within the scope of the present invention.

Claims (5)

, 5 to 14 wt% of a curing agent, 10 to 19 wt% of a crosslinking agent, 6 to 10 wt% of an additive, 6 to 15 wt% of a foaming agent, 2 to 5 wt% of a pigment and 3 to 6 wt% of a UV stabilizer And is coated on the surface of the marine facilities to form a coating layer.
The method according to claim 1,
Wherein the prepolymer is formed by reacting MDI as an isocyanate and ether-based PPG as a polyol.
The method according to claim 1,
The curing agent is a material for repairing and reinforcing marine facilities, characterized in that a diisocyanate compound is mixed with MDI monomer, MDI dimer, MDI trimer, Polymeric MDI, MDI prepolymer and aliphatic tertiary diamide compound as main components .
The method according to claim 1,
Wherein the cross-linking agent is one of MOCA and NDI.
The method according to claim 1,
Wherein the additive is a mixture of one or more of stones, calcium carbonate, clay, Pb-octoate, defoamer, inorganic salt, clay and glass fiber.