KR100935407B1 - Hybrid type finishing coating agent composition for earthquake-resistant repair of concrete structure - Google Patents

Abstract

PURPOSE: A finishing coating agent composition is provided to ensure excellent adhesion, damping property, flexibility, elasticity, abrasion resistance, water resistance, chemical resistance, thermal insulation, and ultraviolet blocking property. CONSTITUTION: A hybrid type finishing coating agent composition comprises a fluorinated polyurethane aqueous dispersion and surface-treated fine hollow powder. The surface-treated fine hollow powder is obtained by dipping and filtering the fine hollow powder using aluminum silicate as a main component to a treatment solution prepared using a silane coupling agent. The fluorinated polyurethane aqueous dispersion is prepared using organic diisocyanate, macroglycol, and diol.

Description

HYBRID TYPE FINISHING COATING AGENT COMPOSITION FOR EARTHQUAKE-RESISTANT REPAIR OF CONCRETE STRUCTURE}

The present invention relates to a finish coating composition for use in seismic repair of concrete structures.

In general, deterioration of concrete structures is largely due to external physical and chemical deterioration factors.

Physical deterioration factors include earthquakes, wind pressure and water pressure, or vibration generated in the concrete structure itself, and in the case of offshore structures, various physical factors such as waves and water pressure exist.

Chemical deterioration factors include dry and wet repetition due to moisture encountered by concrete structures, salt damage due to salt penetration, neutralization of concrete due to carbon dioxide infiltration, freeze thawing due to severe changes in ambient temperature, and various acids. And chemical erosion by erosion.

Due to these deterioration factors, phenomena such as cracking, water leakage, reinforcing bars, peelings, and falling down occur in concrete structures. In severe cases, the structures may collapse.

The present invention has been made to solve the above-mentioned problems, with excellent adhesion to cope with physical deterioration factors, has a dust resistance, flexibility, elasticity, friction resistance, waterproof, chemical resistance, heat insulation that can cope with chemical degradation factors It is an object of the present invention to provide a finish coating composition for earthquake-resistant repair of a concrete structure having UV protection, and at the same time, an environmentally friendly material and does not cause pollution.

In order to achieve the above object, the hybrid type finish coating composition for earthquake-resistant repair of a concrete structure according to the present invention includes a finish coating composition for repairing a concrete structure, an aqueous dispersion of fluorinated polyurethane; And a surface-modified fine hollow powder obtained by immersing and filtering the fine hollow powder mainly composed of aluminum silicate in a surface modification treatment liquid prepared using a silane coupling agent.

The hybrid finish coating composition for seismic repair of a concrete structure according to the present invention has the following performance capable of preventing physical and chemical deterioration factors of the concrete structure.

In addition to excellent adhesion to cope with physical deterioration factors, it has dustproofness, flexibility, elasticity and friction resistance, and is waterproof, chemically resistant, thermally insulated, and sunscreen resistant to chemical degradation factors. Does not cause pollution.

Hereinafter, the present invention will be described in detail.

The hybrid finish coating composition for seismic repair of concrete structures according to the present invention comprises a fluorinated polyurethane aqueous dispersion and surface modified fine hollow body powder.

Polyurethane means the polymer which contains a urethane bond group (-NH * CO * O-) in a molecular chain. Urethane linkages included in polyurethanes are produced by reactions between isocyanates (-NCO) and alcohols (-OH).

    R-NCO + HO-R '→ R-NHCO-O-R'

(Isocyanate) (alcohol) (urethane)

Polyurethanes can be synthesized through various polyols and various kinds of diisocyanate combinations for introducing hydrophilic properties, thereby enabling various kinds of polyurethane applications.

Fluorinated polyurethane aqueous dispersions can be synthesized using organic diisocyanates, macroglycols, and diols. Macroglycols consist of polyols and fluorinated polyethers finished with hydroxide ions or carboxy ions. Diols contain hydrophilic ionizable functional groups.

The hydroxyl groups of the organic diisocyanate and the polyol form a urethane bond with a blocking reaction. At this time, the ionizable groups in the diol are converted into hydrophilic anions through a salification process, and are stabilized as a whole. Chloride oligo-urethane is dispersed in water to prepare an aqueous dispersion of fluorinated polyurethane.

When reacting organic diisocyanate, macroglycol, and diol, the molar ratio of the isocyanate group to the OH group is 1.5 is appropriate and the reaction is carried out at 50 ~ 90 ℃.

The production method of the fluorinated polyurethane aqueous dispersion can be divided into a forced emulsification method and a self-emulsification method.

The forced emulsification method is used in the synthesis of isocyanate polyurethane, and is a method of forcibly emulsifying with water by introducing a surfactant after reacting with a reactive amine for blocking NCO.

Examples of self-emulsifying methods having good stability of the dispersion include a method of introducing a hydrophilic group into the polyurethane main chain, and a method of finishing the terminal with strong hydrophilic sodium bisulfite (NaHSO ₃ ) after isocyanate prepolyurethane synthesis.

On the other hand, the fine hollow powder has aluminum silicate as a main component, usually has a size of 30 ~ 100㎛, forms a ceramic film of the closed air layer to exhibit a light weight and heat insulation effect. In addition, it is a non-flammable material having a melting point of about 1,800 ° C., which is an environmentally friendly material that contains no toxic organic compounds as well as eight toxic heavy metals and has no toxicity.

In addition, the film has a compressive strength of about 3,000 N / cm ³ and has a very hard structure, excellent durability, and exhibits a semi-permanent insulating effect. This is not only excellent in summer solar radiation shielding effect (compared with glass fiber 200mm, urethane foam 100mm), but also heat loss blocking effect by indoor convection in winter (equivalent to 50mm glass fiber and 25mm urethane foam) in winter. Condensation prevention effect is also very good.

In addition, it blocks about 89% of ultraviolet rays, suppresses the increase in sensation temperature caused by ultraviolet rays, and has excellent corrosion protection (acid resistance, alkali resistance and weather resistance) in terms of physical properties, and insect repellent, soundproofing, abrasion resistance, impact resistance great.

Table 1 below shows the physical and chemical performance of the above-described fine hollow body powder.

On the other hand, Figure 1 (a) is an enlarged photograph of the fine hollow body powder, (b) is an enlarged image of the state in which the spherical hollow body is broken by grinding the fine hollow body powder.

From these photographs, it can be seen that the fine hollow body powder consists of spherical particles, and the spherical particles are hollow bodies.

The hollow powder having the above performance has a problem that its dispersion is not easy when dispersed in the fluorinated polyurethane aqueous dispersion. As a means for solving this problem, in the present invention, such a fine hollow powder is used by surface modification treatment. The surface modification treatment liquid used in the surface modification treatment is a product produced by hydrolyzing a silane coupling agent. It is to use.

The silane coupling agent forms a siloxane crosslinked structure through a hydrolysis reaction, which is combined with a hydroxyl group on the surface of the hollow body to achieve a dispersable and chemically stable state. As such a silane coupling agent, it is preferable that they are at least 1 or more of methyl trimethoxysilane, decyl trimethoxysilane, an epoxy silane, an aminosilane, a phenylsilane, tetraethoxysilane, and a gresidoxytritrimethoxysilane.

                                [Figure 1]

Figure 1 illustrates the formation of siloxane crosslinks. The silane coupling agent reacts to form siloxane bonds, and a siloxane crosslinked structure is formed through hydrolysis and polycondensation (dehydration, dealcohol) reactions. In particular, the three-dimensional network structure of the siloxane is formed through the dehydration reaction.

The reaction formula of the hydrolysis, polycondensation (dehydration, de-alcohol) reaction is as follows.

Hydrolysis reaction: Si (OR) _n + XH ₂ O → Si (OH) _x (OR) _nx + ROH

-Polycondensation reaction

Dehydration reaction: -Si-OH + H-O-Si- → -Si-O-Si- + H ₂ O (3D network structure formation)

    Dealcoholization reaction: -Si-OH + R-O-Si- → -Si-O- + ROH

The siloxane cross-linked siloxane product produced through this reaction process has a low molecular weight of 2,000 to 3,000, so it is not only excellent in permeability to porous inorganic materials but also does not react with trace amounts of water as an insoluble structure. An inorganic polymer thin film can be obtained.

The above-described fine hollow powder is subjected to surface modification by using the surface modification treatment solution on which siloxane crosslinks are formed. The surface modification treatment is performed by immersing the fine hollow powder in the surface modification treatment liquid, followed by filtration and drying.

Since the bonded binder has both a hydrophilic group and a hydrophobic group at the same time, the hydrophilic group is easily bonded to the organic material, and the hydrophobic group is easily bonded to the inorganic material.

The surface-modified fine hollow powder is mixed with the aforementioned fluorinated polyurethane aqueous dispersion to prepare a finish coating composition of the present invention.

Surface modification treatment of the fine hollow powder as described above results in uniform dispersibility when mixed with the fluorinated polyurethane aqueous dispersion. That is, the fine hollow powders are evenly dispersed without agglomeration with each other to maximize the aforementioned various characteristics of the fine hollow powder.

Polyurethane has a very smooth surface, good frictional resistance, excellent elasticity, flexibility, flexibility, chemical resistance, cold resistance, heat resistance, and adhesion.

Conventional polyurethanes have been handled in a dispersed state in organic solvents, and thus emit a large amount of volatile organic substances that are harmful to humans and may cause pollution when used.

However, the fluorinated polyurethane aqueous dispersion liquid used in the present invention can prevent environmental pollution by replacing the volatile organic solvent used for dispersion with water. In addition, by eliminating the use of harmful organic matter, not only the work environment can be improved, but also the work in a narrow space is possible.

On the other hand, since the fluorinated polyurethane aqueous dispersion liquid used by this invention contains a fluorine component, it is excellent in water resistance.

Since the hybrid type finish coating composition for repairing concrete structures according to the present invention is prepared by mixing a surface-treated micro hollow powder with an aqueous fluorinated polyurethane dispersion, each of the aqueous fluorinated polyurethane dispersion and the surface-treated micro hollow powder All of the above characteristics and advantages will be shown.

Accordingly, the finish coating composition of the present invention has excellent adhesion to cope with physical deterioration factors as a finish coating agent for preventing deterioration of concrete, and has dustproofness, flexibility, elasticity, and friction resistance, and can cope with chemical degradation factors. It has waterproof, chemical resistance, heat insulation, UV protection, etc., and at the same time, is an environmentally friendly material and does not cause pollution.

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

<Example>

Production Example  1 (Preparation of Fluorinated Polyurethane Aqueous Dispersion)

3.1 parts by weight of dimethylol propionic acid, 19.2 parts by weight of polyethylene glycol, and 2.1 parts by weight of fluorinated polyether are placed in a reactor, purged with nitrogen, and stirred at room temperature for 10 minutes. And 5.9 weight part of hexamethylene diisocyanate is added slowly, and it stirs for 20 minutes. This was heated to raise the reaction temperature to 45 ° C., followed by adding 0.02 parts by weight of dibutyllin dirorate, and then reacting for 2 hours and 30 minutes while raising the reaction temperature to 80 ° C. At this time, be careful not to exceed the reaction temperature of 85 ℃. After reacting at 80 ° C, when the temperature is lowered to 60 ° C, 1.1 parts by weight of acetone is added, followed by stirring for 10 minutes. After completion of the stirring, a mixture of 1.7 parts by weight of dimethylethanolamine and 33.7 parts by weight of distilled water was added to the reactor over 10 minutes. After stirring for 10 minutes, 35.8 parts by weight of distilled water is added again. When the addition of distilled water is completed, acetone is distilled and removed to prepare an aqueous fluorinated polyurethane dispersion.

Production Example  2 ( Surface modification  Preparation of Treatment Liquid)

21.6% by weight aqueous solution of nitric acid diluted with distilled water to dilute to pH 2-3, isopropyl alcohol 25.2% by weight, ethyl alcohol 21.6% by weight, normal hexane 2.7% by weight, methyltrimethoxysilane ( 16.2% by weight of TSL8113 (trade name, manufactured by Toshiba Corporation), 1.8% by weight of decyltrimethoxysilane (KBM3103C (trade name, manufactured by Shin-Etsu Co., Ltd.)) as a silane coupling agent, 10% by weight of an acrylic resin, and 0.9% by weight of acetone. To prepare a surface modification treatment liquid.

Production Example  3 ( Surface modification  Processed fine Hollow body  Manufacture of powder)

In the surface modification treatment solution prepared in Preparation Example 2, aluminum silicate was used as a main component and the fine hollow body powder having a size of 30 to 100 µm was immersed. Next, the micro hollow powder is filtered and dried at 300 to 400 ° C. for 2 to 3 hours to prepare a surface modified micro hollow powder.

Example

To 100 parts by weight of the fluorinated polyurethane aqueous dispersion prepared in Preparation Example 1, 8 parts by weight of the surface-treated fine hollow powder prepared in Preparation Example 3 was added thereto, followed by stirring for 20 minutes to form a hybrid finish coating composition for repairing concrete structures. To prepare.

Although the present invention described above has been described in detail only with respect to the specific examples described, it will be apparent to those skilled in the art that various modifications and changes are possible within the technical scope of the present invention, and such modifications and modifications belong to the appended claims. will be.

Figure 1 (a) is an enlarged photograph of the fine hollow body powder used in the present invention, (b) is an enlarged image of a state in which the spherical hollow body is broken by pulverizing the fine hollow body powder.

Claims (3)

In the finishing coating composition for repairing concrete structures, Fluorinated polyurethane aqueous dispersions; And For earthquake-resistant repair of a concrete structure, the surface modification treatment liquid prepared by using the silane coupling agent comprises a surface modification-treated fine hollow body powder obtained by dipping and filtering the fine hollow body powder containing aluminum silicate as a main component. Hybrid finish coating composition. The method of claim 1, The fluorinated polyurethane aqueous dispersion is a hybrid finish coating composition for earthquake-resistant repair of a concrete structure, characterized in that prepared using organic diisocyanate, macroglycol, and diol. The method according to claim 1 or 2, The silane coupling agent is at least one of methyltrimethoxysilane, decyltrimethoxysilane, epoxysilane, aminosilane, phenylsilane, tetraethoxysilane, and glycidoxytritrimethoxysilane. Repair type hybrid finish coating composition.

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