KR100838242B1 - Closing materials for construction including infiltrative impregnation and aqueous coating agent and construction method using the same - Google Patents

Abstract

The present invention relates to an aqueous coating material for reinforcing the concrete floor of a building or civil engineering structure and dustproof finish and a construction method using the same. More specifically, 1) concrete sphere including water-soluble alkali metal silicate, aluminum hydroxide and colloidal silica. It consists of an impregnant for reinforcement and 2) a dustproof finish coating layer with a binder function that induces multi-coordination bonds by chelates to stabilize and strongly complex the aqueous coatings. Impregnating agent for reinforcement of concrete underlay is colloidal silica dispersion solution with 15 ~ 30 wt% silica (SiO ₂ ) content of 10 ~ 15nm particle size, 7 ~ 15 wt% water soluble alkali silicate (Alkali metal silicate), aluminum hydroxide [Al (OH) ₃ ] It is characterized in that 5 to 10% by weight, the dust-proof finish coating material is used after the impregnating agent is 10 to 40% by weight of water-soluble silicate (Alkali metal silicate), 0.25 ~ 4.0% by weight of the suspending agent (Suspending agent) It is composed of 20 to 45% by weight of filler, 0.1 to 0.8% by weight of chelating agent, 0.1 to 0.5% by weight of absorbent, and 10 to 69% by weight of water. The dustproof finish according to the present invention is a method taking only the advantages of the conventional organic coating finish method and reinforcement method by infiltration, the floor finishing method according to the present invention has no smell and VOC due to the water-based coating material and the environment is flame retardant There is a characteristic of being friendly. In particular, the floor finish according to the present invention is to strengthen the concrete floor through the penetration type impregnating agent having a composite reinforcing function, and the conventional floor by the double reinforcement action through the surface coating of the water-based dust-proof finish material given the coloring function It has the advantage of significantly improved performance and functionality than finishes.

Concrete, Chelate Bond, Finish, Water Soluble Alkalisilicate, Wear Resistance

Description

Closing materials for construction including infiltrative impregnation and aqueous coating agent and construction method using the same

1 is a cross-sectional view of concrete constructed with a building finishing material of the present invention.

* Explanation of symbols for main parts of the drawings

1: concrete

2: impregnant penetrated inside the concrete

3, 4: coating layer

The present invention relates to a building finishing material and a construction method using the same, and more particularly, in the dust-proofing, finishing work of a conventional building in which the epoxy-based paint coating material, which is a volatile organic material, is the mainstream, it is possible to integrate with concrete to lift the phenomenon It does not occur, it is given the coloring performance of the top coat, it is possible to strengthen the building by using an aqueous coating material which does not have environmental pollution problems, in particular, for construction that exhibits flame retardancy without generating harmful gases when exposed to fire It relates to a finishing material and a construction method using the same.

When concrete surfaces are exposed as they are in general buildings or factories, the floor surface is crushed or aged due to deterioration of concrete in the long term, causing environmental pollution due to the generation of concrete dust that is harmful to the human body. Therefore, in order to keep the environment of these spaces comfortable, the concrete floor must be improved to suppress the occurrence of cracks and dust. To this end, various dustproof floor finishes are used, and most of the floor finishes used are synthetic resins such as epoxy and urethane.

However, there are too many kinds of synthetic resins and are being used without proper criteria or analysis on usage or economic feasibility. In particular, synthetic resins such as epoxy and urethane are most often used due to their adhesion to concrete, waterproofness, and other properties of other synthetic resins.However, after a certain period of time after construction, the physical properties of concrete and synthetic resins, which are inorganic materials, Due to this, the coated resin material is often peeled or broken. This partial peeling is caused by physical properties between different materials, especially in four-season environment, such as in Korea, due to the difference in temperature and humidity, resulting in increased construction costs and complaints. Until now, most of the floor finishing materials are synthetic resin series.

In addition, various adhesives and interior materials were used indiscriminately in consideration of economic logic rather than eco-friendliness, namely, cost and simplicity. ) And environmental hormones are becoming social problems. At this point, many environmentally friendly materials have been developed and released in accordance with the Indoor Air Quality Management Act, which has been in effect since May 2004. Grass, etc.), and eco-friendly finishing materials are not yet on the floors of factories and parking lots.

On the other hand, the coating material for protecting the concrete floor is important to maintain a good adhesion and long lasting with the existing concrete sphere. Defect problems that occur in most concrete protective coatings are mainly caused by adhesion with concrete rather than deterioration of the coating film itself. Most organic or water-soluble coating materials have excellent initial adhesion performance after coating, but after prolonged periods of time, they can be lifted, peeled, and swollen at the surface of the coating due to environmental conditions, the behavior of concrete itself, and internal moisture. It is lost. In particular, the organic coating material is highly dependent on the surface moisture content of the concrete base material, the humidity of the painting environment, and the ventilation conditions. In most cases, the organic coating material is coated after drying the surface water content within 5-8%. Ventilation is required.

At present, there are various materials for surface finishing of concrete floor, but epoxy coating coating method is mainly used for floor finishing works such as underground parking lot in major construction sites in Korea. Finishing methods are used.

Epoxy- or urethane-based organic coatings, which are mainly used for floor finishing, have excellent finishing performance, impact resistance, stain resistance, and chemical resistance. It is the most widely used product because it can be used. ① It acts as a harmful factor to human body and environmental pollution by releasing harmful volatile substances and environmental hormones. ② It generates a lot of noise due to friction with tires when driving a vehicle. The quality of finishing materials is large, and it is vulnerable to moisture and not breathable, so there are many defects such as swelling, lifting and peeling in the long run. There are many disadvantages such as the cause of ignition in case of fire and the generation of a large amount of toxic gas.

Especially, epoxy resin contains bisphenol, and bisphenol A epoxy is a typical epoxy type. Bisphenol is a white crystalline powder with a molecular weight of 228.29, specific gravity of 1.195 (25 ° C) and a boiling point of 360.5 ° C. It is produced by condensation and dehydration of acetone and two molecules of phenol, and becomes a raw material for making epoxy resin by condensation with epichlorohydrin. Condensation to make 100% phenolic resin. What is collectively called an epoxy resin is a chemical unit of a molecule constituting it, and has an epoxy bond, and is typically made by polymerizing epichlorohydrin and bisphenol A. Bisphenol A was selected as one of 67 environmental hormones, which are representative endocrine disruptors, as defined by the World Ecological Conservation Fund (WWF). Bisphenol A is an estrogen-like substance like dioxin, and it is known that life forms endocrine disorders and mutations by accepting these environmental substances as human hormones.

There are several data on bisphenol A. Bisphenol A, a representative environmental hormone, is particularly serious because it is accumulated in the human body for a long time rather than short-term effects. Although there is no clear evidence of human harm, it has been shown to cause genital abnormalities, sperm count, and developmental disorder in animals, and it can cause testicular cancer and leukemia. Epoxy is also flammable and can be dangerous due to difficulty breathing when working in confined spaces during construction.

On the other hand, conventional organic paints have been examined a lot of water-based binders as an organic substitute due to environmental problems, as described above, despite the excellent physical properties, but the mechanical properties are relatively low due to the weak bonding strength, reversible in the water environment due to weak moisture Due to the weakness of the physical properties of the coating due to the reaction was a lot of restrictions on use. In addition, these components dispersed in water have a low viscosity, unlike organic paints, do not achieve a stable dispersion state in the water dispersion system, settled, or the separation of materials occurred, it was difficult to show the performance as a finish paint.

In addition, Colorhardner, which is used for flooring in order to add cleanliness to factory floors and underground parking lots, is considered to be advantageous because it has no volatile substances in terms of atmospheric environment than organic finishes, but it contains heavy metals such as nickel and chromium. It contains a lot of alloy steel raw materials and inorganic pigments such as iron oxide, titanium dioxide, chromium, etc., and there is a lot of dust during the operation, it can be harmful for long-term exposure to workers working in confined spaces. In addition, the work process is easier than the painting finishing method, but the finish, appearance, usability is greatly reduced, the quality is also dependent on the construction ability of the operator has a disadvantage of large quality deviation. Due to these factors, powder colorharder products are gradually being pushed out of the market compared to organic finish paints.

Recently, there is a liquid penetrating hardener in the hardener process. The liquid penetrating hardener is a principle of watertightening hardening structure through the reaction of hydrate and hardener component of concrete. It has the advantage of avoiding problems, but ① It takes a long time to express its performance due to its physical properties depending on the cement and hydration reactions. ② The surface color is discolored after long-term use. This problem is inadequate due to problems such as degradation, ④ difficulty in reinforcing depth, and ⑤ variation in penetration depth depending on the strength and water tightness of the concrete matrix.

The defects that occur mainly in the floor finishing work of the conventional parking lot are largely classified into four types.

1) Most of the defects in the parking lot floor are lifted and broken. Lifting is a phenomenon caused by the lack of adhesion strength between the base surface and the finish material is mainly generated in the useful finishes such as epoxy, resin mortar-based, urethane-based. In Korea, there is no specification standard. In Japan, the adhesive strength is based on 2.0N / mm ² (20kgf / cm ² ) or more. (13 kgf / cm ² or more in the case of passenger-only parking lot) The material properties of the resin finishes are more than 30 kgf / cm ^{2, but it} is completely dried during the construction of the site (8% water content and 85% air humidity). It is difficult to install, and it is mainly caused when inlay removal and surface moisture removal are incomplete. Cracking occurs in hard finishes and epoxy finishes as a result of surface strength not exceeding a certain strength due to the use of low-grade concrete, initial curing, and bleeding.

2) Epoxy-based and hardner-based flooring materials that lack elasticity, even in the case of minor cracks (0.3 mm or less) that occur in concrete structures during cracks and leaks, cause penetration cracking due to lack of crack tracking. It causes the ceiling sound absorbing material to wet and contaminate the lower floor vehicle. For floors with poor crack tracking, crack control of concrete, which is a base material, is essential and its success is a measure to prevent leakage due to cracks and through cracks.

3) Abrasion is a phenomenon in which the surface of the floor hardener is worn, which is caused by a lack of wear resistance of the floor hardener, a thin finish, or frequent traffic. In the finishing of a thin epoxy coating or the like, the concrete surface may be exposed by abrasion, thereby causing aesthetic problems or dustproof problems. In the case of a hardner-based material, dust may be generated due to wear when strength is insufficient.

4) In the case of synthetic polymer resin finishes, noise due to sliding is generated in driving or curve roadways. There is no domestic performance standard for this, and in Japan, the coefficient of friction is set to 0.5 or more. Other types of defects include dust generation and color dissatisfaction.

As discussed above, currently used car parks and finishing materials for dust protection and protection of factory floors have problems during construction (volatile matters, environmental hazards, odors, dust), performance problems after use (lifting, abrasion, breakage), maintenance Management problems (difficult to repair due to odor, ignition in case of fire, combustion), and economic problems (construction cost, high material cost) are urgently needed to improve these problems.

Therefore, the present invention is to improve the original base of the concrete sphere by the impregnating agent of the aqueous system in order to improve the environmental hazards, problems caused by the characteristics of the conventional organic finish, lifting, damage problems, fire hazards, etc. It is an object of the present invention to provide a building reinforcement of the composite reinforcement method by forming an upper coating film by coating a water-based coating finish.

In addition, the present invention solves the problem of mechanical properties and durability of the water-based coating material by inducing a strong complex bond between the composition through the chelate bond, harmless to the human body and the environment, flame-retardant, high adhesion by the integration with concrete, wear resistance The purpose is to provide a building finishing method using environmentally friendly building finishing materials capable of water resistance, chemical resistance, beautiful appearance (color).

The present invention for achieving the above object is an impregnating agent to penetrate the concrete surface; And it is made of an aqueous coating having a strong complex bond through a multi-coordination bond using a chelating agent, it provides a building finishing material characterized in that the impregnating agent and the coating agent is used in stages.

The impregnating agent is 100 parts by weight of colloidal silica dispersion solution having a silica (SiO ₂ ) content of 10 ~ 15nm particle size of 15 ~ 30% by weight based on the weight of the silica dispersion solution, and water-soluble alkali silicate (Alkali metal silicate) 7-15 By weight, aluminum hydroxide [Al (OH) ₃ ] It is characterized in that 5 to 10 parts by weight.

The coating agent is 10 to 40% by weight of water-soluble alkali silicate (Alkali metal silicate), 0.2 to 4.0% by weight of suspending agent, 20 to 45% by weight of filler, 0.1 to 0.8% by weight of chelating agent It is characterized by consisting of 10 to 69.6% by weight of water.

The water-soluble alkali silicate is characterized in that the weight ratio of M ₂ O: SiO ₂ 1: 1.8 to 3.75. (The M is an alkali metal, in particular at least one selected from sodium, potassium, lithium.)

The anti-settling agent is characterized in that the colloidal magnesium aluminate silicate (Colloidal magnesium aluminate silicate) having a viscosity of 190 ~ 310cps.

The filler is characterized in that at least one selected from mica powder, calcium carbonate powder, titanium dioxide powder, silica powder.

The chelating agent is at least one alkali soluble salts selected from alkylene-diamine-polyalkanoic acids and hydroxyalkyl alkylene-diamine-polyalkanoic acids. It is characterized by a mixture.

In addition, the present invention is 100 to 100 parts by weight of colloidal silica dispersion solution of the silica (SiO ₂ ) content of 10 ~ 15nm particle size with respect to the weight of the silica dispersion solution, and water-soluble alkali silicate (Alkali metal silicate) 7-15 Parts by weight, aluminum hydroxide [Al (OH) ₃ ] 5 to 10 parts by weight A step of infiltrating the mixed impregnant on the concrete surface; And 10 to 40% by weight of water-soluble alkali silicate (Alkali metal silicate), 0.2 to 4.0% by weight of suspending agent, 20 to 45% by weight of filler, and chelating agent on the surface of the impregnated concrete. agent) Provides a building finishing method comprising the step of forming a coating layer by applying a coating consisting of 0.1 to 0.8% by weight, 10 to 69.6% by weight of water.

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

The building finish of the present invention is the watertightness of the concrete sphere through the continuous pozzoran reaction of colloidal silica and cement components (eg calcium hydroxide [Ca (OH) ₂ ], unhydrated cement minerals) penetrated into the concrete It enhances concrete by strengthening and improving salt resistance (chloride, sulfate, etc.) by aluminum hydroxide, and pore deposition by penetration of water-soluble alkali silicate.

In addition, through the surface coating of the protective coating with excellent mechanical properties such as flame resistance, abrasion resistance, and water resistance, the durability of the concrete floor finishing of the parking lot is combined with the impregnant.

In particular, the present invention is a method of metering and mixing in a field where conventional organic systems are divided into a main body and a curing agent, whereas the present invention, which is a composition dispersed in water in a one-component form, is environmentally friendly and has a beautiful appearance and Various colors can be expressed, and the spray mechanized construction can shorten the construction period and obtain a homogeneous quality finish.

The impregnating agent used for reinforcing concrete concrete constituting the building finishing material of the present invention is a mixed composition of colloidal silica, water-soluble alkali silicate and aluminum hydroxide, and the coating agent coated on the surface after strengthening the base is water and a chelating agent [alkylene diamine Water-soluble alkali silicates and fillers using alkylene diamine polyalkanoic compounds and anti-sedimentation agents (colloidal magnesium aluminate silicate), alkali metals such as sodium, potassium and lithium ) Powder, calcium carbonate powder, titanium dioxide powder, silica powder, and the like] and an antifoaming agent, an inorganic pigment, and the like.

(1) impregnant

The impregnating agent used in the present invention is 100 parts by weight of a colloidal silica dispersion solution having a silica (SiO ₂ ) content of 10 to 15 nm particle size of 15 to 30 wt% based on the weight of the silica dispersion solution, and an aqueous alkali silicate (Alkali metal silicate). ) 7 to 15 parts by weight, and 5 to 10 parts by weight of aluminum hydroxide [Al (OH) ₃ ].
First, the function of the components included in the impregnating agent, colloidal silica has a function to enhance the watertightness by the reaction hydrate and cement hydrate. Colloidal silica is a suspension of silicon dioxide hydrate obtained by a method such as reacting dilute hydrochloric acid with a silicate. The structure of the particles is spherical and dispersed in water in the form of colloids. Si-OH and OH- ions are present on the surface and the particles are in a suspended suspension state. Since colloidal silica particles have a size of 10 to 15 nm and are smaller than water molecules, the colloidal silica particles are easy to penetrate not only through capillary pores but also by absorption into gel pores (sponge phenomenon).

The silica component of the impregnating agent consumes calcium hydroxide in cement and transfers to durable CSH hydrate by the following reaction, thereby densifying the hydration hardened structure and transferring the pore distribution to the micropores, thereby improving water tightness. This effect has the effect of improving the strength and wear resistance of the concrete spheres and other mechanical properties.

 C3S, C2S (cement mineral) + H2O → CSH + Ca (OH) 2

C3S, C2S + H2O → CSH + Ca (OH) 2 ------- [+ fly ash, silicafume: SiO2 (amorphous)]

↓

C-S-H Gel

The silica (SiO ₂ ) content of the colloidal silica dispersion solution is preferably 15 to 30% by weight in the physical properties of the coating film.

Aluminum hydroxide contained in the impregnant improves durability. The aluminum hydroxide salt reacts with the calcium hydroxide of the cement to produce calcium aluminum hydrooxide (C3AH6). The resulting calcium aluminum hydrate is a porous hydrate with a large specific surface area, and has a high adsorption capacity for water-soluble chlorine ions, and reacts with chlorine ions to immobilize it with a salt called Fridel's salt (C ₃ ACaCl ₂ 12H ₂ O). It acts to block the corrosion of concrete.

Aluminum hydroxide acts to improve the flame resistance of concrete by immobilizing chloride ions penetrating from the outside or salt existing inside.

In addition, when concrete is exposed to sulfates or sulfate ions in the air for a long time, ethrinzite acicular minerals are formed by reaction with cement hydrate.

The volume expansion pressure generated during the production of ethrinzite (C3A3CaSO ₄ 32H ₂ O) is about 8 to 10 times, resulting in softening of the hard tissue.

The aluminum hydroxide contained in the impregnant reacts with these hydrates in the process of producing ethrinzite and decomposes into low-expandable monosulfate (C3A3CaSO ₄ 12H ₂ O), dihydrate gypsum and water to prevent the softening of concrete. do.

The aluminum hydroxide is used 5 to 10 parts by weight based on 100 parts by weight of the colloidal silica dispersion solution.

The water-soluble alkali silicates, represented by the molecular formula M ₂ OxSiO 2aq (where M is a component of potassium, sodium and lithium), have a polysilicate structure and are mainly mediators of pigments or powders on the surface. It has an increase in tension and heat resistance which makes the surface beautiful.

The water-soluble alkali silicates penetrated into concrete are deposited on the gel pores of cement hydrate and harden to fill the pores.

An alkali metal salt is deposited in the tissue to fill the gel pores, thereby exerting an effect of increasing the hardening of the hardened tissue by the impregnating agent.

Although it is possible to obtain a concrete flooring material having very strong physical properties only by the effect of strengthening the concrete base material by the impregnating agent of the present invention, it is difficult to express the appearance through the color due to the impossibility of the appearance of the color due to the characteristics of the impregnating agent.

Therefore, when the floor finish is formed by the complex method of impregnation and coating by creating a finishing film layer considering the reinforcement of the concrete itself, concrete protection, dust prevention, and surface appearance, the floor has superior durability compared to the existing single-type product. Construction is possible.

The water-soluble silicate is used in the process of solidifying / stabilizing heavy metals and organic and inorganic materials difficult to handle as an acid resistant matrix.

The water-soluble silicate is characterized in that the weight ratio of M ₂ O: SiO ₂ 1: 1: 1.8 ~ 3.75.

Herein, the M is an alkali metal, and in particular, refers to one selected from sodium, potassium, and lithium.

The addition amount of the water-soluble silicate is very sensitive, it is preferably included 7 to 15 parts by weight based on 100 parts by weight of the colloidal silica dispersion solution.

(2) coating agent

Meanwhile, the coating agent used in the present invention is 10 to 40% by weight of water-soluble alkali silicate (Alkali metal silicate), 0.2 to 4.0% by weight of suspending agent, 20 to 45% by weight of filler (Filler), chelating agent (Chelating agent) ) It is composed of 0.1 ~ 0.8% by weight and 10 ~ 69.6% by weight of water. Unlike conventional organic polymer synthetic paint, water-soluble ceramic silicate, abrasion resistance, heat resistance, chemical resistance, and ceramic material whose main component is mica And a sedimentation inhibitor, and a chelating agent and a pigment component for stably and strongly complexing the coating film thereof.

The aqueous coating agent of the present invention is to solve the problem of weak bonding strength, low mechanical properties and stable dispersion state in the water dispersion system, and the M ₂ O to form a more stable and strong inorganic inorganic coating film of the conventional aqueous coating agent The proper amount of water-soluble alkali silicate (calculated as SiO ₂ ) was derived, and it was composed of silicon dioxide, magnesium oxide and aluminum oxide to stabilize the dispersion system. Using a suspending agent of colloidal magnesium silicate, it is possible to balance each component.

The technique of using anti-settling agents here is very sensitive, and when added inadequately to an aqueous solution of a liquid alkali silicate binder composition, it does not give the necessary sedimentation ability to maintain stability in the final formulation. .

A key technical aspect of the aqueous coating agent of the present invention is a part of enhancing the binding strength of the water-based coating film composition by a chelating agent. The most important part here is the chelating agent. As described above, chelate is a compound obtained by ligand coordination to one molecule of coordination bonds, and the chelate bond becomes a more complex complex bond as one molecule has two or more ligands. Thus, chelating compounds form coordination metal complex salts mainly by ligands.

The chelating agent used in the present invention is one selected from alkylene-diamine-polyalkanoic acids and hydroxyalkyl alkylene-diamine-polyalkanoic acid. Alkaline soluble salts mixture of the above. Here, the mixture includes a case in which the ratio of alkylenediaminepolyalkanoic acid and hydroxyalkyl alkylenediaminepolyalkanoic acid is 2 to 3: 1, such a chelating agent The amount of agent added is very important and greatly affects the stability of the system. When the chelating agents are used alone, they are not chelated to the required level and thus an unstable system is formed, making them impossible to use.

Thus, in the present invention, in order to solve such an unstable system, only the essential amount and ratio of the compound can be derived to obtain the coating properties of the target coating as a chelating agent.

The chelating agent of the present invention is preferably used 0.1 to 0.8% by weight based on the total weight of the coating composition. When used at less than 0.1% by weight, in particular, when a filler is used, the coating composition is not chelated properly during the preparation of the coating agent, causing precipitation and condensation of the composition, thereby lowering the stability of the coating composition. On the contrary, when used in excess of 0.8% by weight, the stability of the coating composition and the incombustibility are weakened.

The water-soluble alkali silicate used in the coating agent of the present invention is as described in the impregnant portion, it is preferable to use within the range of 10 to 40% by weight relative to the total weight of the coating composition. If the water-soluble silicate is used in less than 10% by weight, cracks are generated on the surface of the coating film using the paint during the drying period, and the dried coating film is very weak in impact resistance, resulting in a foam state, resulting in a decrease in water resistance. In addition, when used in excess of 40% by weight, the viscosity becomes too high, making it difficult to use, and when the coating film is dried, cracking occurs.

The suspending agent used in the present invention is a colloidal magnesium silicate composed of 60 to 63% by weight of silicon dioxide, 12.5 to 15% by weight of magnesium oxide, 8.5 to 10% by weight of aluminum oxide, and 12% by weight of other alkali oxides. .

The anti-settling agent is used for the stability of the coating material, the technique of mixing in the coating composition is very important.

For example, when the antisettling agent is added to the aqueous solution, it does not give the final formulation the sedimentation capacity necessary to maintain stability.

Therefore, when using them, it is essential to prepare a water-soluble dispersion (dispersion inhibitor is used in water before use).

The anti-settling agent uses a viscosity of 190 ~ 310cps.

The anti-settling agent is preferably used within the range of 0.2 to 4.0% by weight based on the total weight of the coating composition. If the content is less than 0.2% by weight, the stability of the coating composition is impaired due to the floating and precipitation of the constituents of the coating composition from the aqueous solution. If the content is more than 4.0% by weight, the viscosity becomes very high, making it difficult to use. This is a difficult problem.

The coating material of the building finishing material of the present invention includes an inorganic ceramic filler to improve the heat resistance and abrasion resistance, chemical resistance of the coating film.

As the filler used in the present invention, it is preferable to use at least one selected from mica powder, calcium carbonate powder, titanium dioxide powder, and silica powder.

In the case where the powder component is used as the filler, for satisfactory coating after the coating composition is made into the paint later, the particle diameter is preferably not more than 110 µm.

Especially in the case of calcium carbonate powder or titanium dioxide powder, it is good to make the particle diameter not to exceed 60 micrometers.

The filler including mica is preferably 20 to 45% by weight based on the total weight of the coating. In particular, the component of the mica is 6 to 30% by weight based on the total weight of the coating agent.

Use of less than 6% by weight of mica causes cracks in the dried coating and poor water resistance. On the contrary, when the mica component exceeds 30% by weight, the coating film is cracked during the drying process, and is weak to impact, thereby becoming a powder, and the water resistance is also poor.

The dolomite (Mica) is K (OHF ₂ ) 2A1 ₃ Si ₃ O ₁₀ , forms a plate-like crystals, cleavage pieces are highly elastic.

The particle size of the dolomite is 5 ~ 60㎛, and the plate-like structure of mica improves the mechanical and chemical properties of the coating film by forming a card house-type barrier film inside the coating film.

The use of such a ceramic composition effectively increases the wear resistance of the topcoat material as well as the glossiness and the coefficient of friction, thereby enhancing the required performance of the flooring material.

Although the particle size of the filler component is not critical, 5 to 60 μm is preferred. Particularly preferred fillers are those which have undergone micronization using high pressure steam jets. This process separates the mica thin film to produce a constant mineral with a particle size range of 5 to 20 µm. The use of such high-quality mica produces a dry coating with very good water resistance without the need for curing, such as a baking cycle or chemical treatment.

Among the components constituting the coating composition of the present invention, water preferably contains 10 to 66.9 wt% with respect to the total weight of the coating composition, more preferably 15 to 50 wt%. The use of less than 10% by weight of water leads to excessively high tack, and the use of more than 69.6% by weight results in too low tack, such that the components of the essential coating composition do not have sufficient durability after drying.
Building finishing method of the present invention is a step of penetrating the impregnating agent of the above (1) to the concrete surface; And forming a coating layer by applying the coating agent of (2) to the concrete surface in which the impregnating agent has penetrated.
First, 100 parts by weight of a colloidal silica dispersion solution having a silica (SiO ₂ ) content of 10-15 nm particle size of 15-30% by weight based on the weight of the silica dispersion solution, 7-15 parts by weight of an aqueous alkali silicate (Alkali metal silicate), 5-10 parts by weight of aluminum hydroxide [Al (OH) ₃ ] by impregnating the mixed impregnating agent to the concrete surface to improve the water-tightness of the concrete sphere, it is possible to strengthen the concrete by the flame resistance and pore deposition action.
In addition, on the surface of the concrete impregnated with the impregnating agent, 10 to 40% by weight of water-soluble alkali silicate (Alkali metal silicate), 0.2 to 4.0% by weight of suspending agent (Filler) 20 to 45% by weight, chelating agent (Chelating) agent) The coating layer is formed by applying a coating agent composed of 0.1 to 0.8% by weight and 10 to 69.6% by weight of water, thereby improving mechanical properties such as flame resistance, abrasion resistance, and water resistance, thus enhancing the durability of concrete.

Hereinafter, the present invention will be described in more detail with reference to Examples, but the scope of the present invention is not limited to the following Examples.

 <Examples 1-5, Comparative Examples 1-3>

Water-soluble silicate and aluminum hydroxide were sequentially added to the colloidal silica dispersion solution, followed by stirring and aging to prepare an impregnating agent. The water-soluble alkali silicate was dissolved in water, and the sedimentation inhibitor, filler and chelate were sequentially added and stirred. Put the absorption inhibitor and aged for 24 hours to prepare a coating. The composition of the component is shown in Table 1 below.

After the impregnant was applied to Φ100mm x 5mm mortar plate dried at room temperature to 0.2 kg / m 2, the impregnating material was absorbed into the test specimen, and the coating material was coated to have a coating thickness of 0.35 mm immediately after being touch-dried.

In order to measure the water resistance and impact resistance, the test specimen coated with the impregnant and the finish coating material on the 150 x 70 mm fiber-reinforced cement plate with the same thickness with a brush or the like was cured in the same laboratory for 28 days.

division Example 1 Example 2 Example 3 Example 4 Example 5 Comparative Example 1 Comparative Example 2 Comparative Example 3 Impregnant Colloidal silica dispersion solution: 100 parts by weight (SiO2 content, weight%) 20 20 20 25 25 - 10 20 Water Soluble Alkalisilicate (part by weight) Potassium silicate 10 - - 10 - - - - Sodium Silicate - 10 - - - - - - Lithium silicate - - 10 - 10 - 10 5 Aluminum hydroxide (parts by weight) 6 6 6 6 6 - 6 6 Coating Water Soluble Alkalisilicate (% by weight) Potassium silicate 35 25 - 40 25 25 25 - Sodium Silicate - - 25 - 15 15 - 15 Lithium silicate - 15 15 - - - 15 10 Sedimentation inhibitor (% by weight) Magnesium silicate 0.75 0.75 0.75 0.75 0.75 0.75 0.75 0.75 Filler (% by weight) mica 27 25 30 6 20 30 6 5 Calcium Carbonate Powder - - - 10 4 - 10 15 Titanium dioxide powder 17 14 5 13 5 15 10 10 Silica powder - - 4 10 10 - 13 9 Chelating Agent (Weight%) 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 Water (% by weight) 19.75 19.75 19.75 19.75 19.75 13.75 19.75 34.75 * Chelating agent: ethylenediaminetetraacetic acid 70%, hydroxyethyl ethylenediaminetriacetic acid 30%

Abrasion resistance, adhesion strength, water resistance, impact resistance, breathability, flame retardancy, and the like of the mortar treated with the impregnating agent and the coating agent prepared in Examples and Comparative Examples were carried out as follows, and the measurement results of the physical properties are shown in Table 2 below. .

(1) wear resistance

The coated specimens were cured for 28 days in the same laboratory, and applied under a load of 500g using a TABER type abrasion tester according to KS M ISO 9352 (measurement of abrasion resistance by plastic-abrasive wheels) specified in the housing specification. The weight loss was measured after 500 rotational frictions using the abrasive wheel H22.

(2) adhesion strength

It was performed according to 6.7 (Adhesive Strength Test) of KS F 4715.

One day before the end of the prescribed curing, the test piece is placed horizontally in the curing room, and the upper tension jig (steel attachment) is applied to the bottom surface and the sample application surface, and then the upper tension jig is placed gently and rubbed.

The upper tension jig is fixed with an adhesive tape or the like so as not to move during the curing of the adhesive, and then cured for 24 hours.

Immediately thereafter, after confirming the curing of the adhesive, the adhesive tape was removed, grooves were formed along the four peripheries of the upper tension jig by the thickness of the sample, and the load speed until breaking the tensile force in the direction perpendicular to the sample surface was 10 mm /. Apply min to find the maximum load at break. Bond strength is calculated by dividing the maximum load by the cross section.

(3) water resistance

According to KS M ISO 2812-1 (Paint and varnish-liquid resistance measurement-Part 1: General test method), swelling and discoloration were observed after immersion in water for 25 hours at 25 ° C.

(4) impact resistance

At room temperature and humidity, the iron rods (spherical ends), weighing 1 kg and 1/2 inch in diameter, were dropped at the center of the specimen at a height of 50 cm and observed for surface damage.

(5) breathable

The moisture permeability was evaluated according to KS F 4936 to ensure the performance (breathability) of the coating material to permeate moisture, thereby reducing the occurrence of defects on adhesion such as lifting or peeling of the coating film by passing moisture from the concrete substrate.

(6) flame retardant

According to the flame retardancy test of the building material of KS F 2819, the specimens made of 30 x 20cm size were heated in the heater for 10 seconds, 20 seconds, 30 seconds 1,2,3 minutes, and the carbonization length and the spark generation were observed.

For reference, flame retardant grade 1 has a carbonization length of less than 5cm and no flame is generated. Flame retardant grade 2 has a carbonization length of less than 10cm and grade 3 has a flame occurrence of less than 5 seconds.

division Abrasion Resistance (Weight Loss, mmg) Adhesion Strength (kgf / cm ² ) Water resistance Impact resistance Breathable (g㎡ / day) Flame retardant Carbonization Length (cm) Rest of flame Example 1 118 23.4 clear clear 17.1 none none Example 2 128 22.7 clear clear 15.9 none none Example 3 136 21.3 clear clear 19.4 none none Example 4 184 22.4 clear clear 20.3 none none Example 5 150 24.5 clear clear 18.1 none none Comparative Example 1 235 17.4 clear damaged 8.4 none none Comparative Example 2 312 21.5 Surface part clear 32.5 none none Comparative Example 3 578 16.8 Surface part damaged 54.4 none none

As a result of the physical property evaluation, the examples of the present invention were all excellent in overall physical properties than Comparative Example 1 without using the impregnating agent, the colloidal silica content is low, the comparative example 2 also has a low content of the absorption inhibitor, wear resistance, It can be seen that the physical properties of water resistance and breathability are not good, the content of the water-soluble alkali silicate included in the impregnant, and the comparative example 3 having a low content of mica in the filler composition included in the coating agent, including water resistance and water absorption It can be seen that the physical properties are very poor.

 <Examples 6-10, Comparative Examples 4-7>

Only the impregnant was penetrated to measure physical properties.

To the colloidal silica dispersion solution as shown in Table 3, the water-soluble silicate and aluminum hydroxide were sequentially added, stirred, and aged to prepare an impregnating agent. 0.2 kg / m 2 of the impregnating agent in a Φ100 mm x 5 mm mortar plate dried at room temperature. It was applied to the wear resistance test, and the weight ratio of cement, sand, and water was 1: 2.5: 0.65, and the mortar made of 50 x 50 x 50 mm cubic body was cured for 28 days. Rain, water permeability, water absorption and flame resistance were measured as follows. Physical property measurement results are shown in Table 4 below.

division Example 6 Example 7 Example 8 Example 9 Example 10 Comparative Example 4 Comparative Example 5 Comparative Example 6 Comparative Example 7 Impregnant Colloidal Silica Dispersion Solution (SiO2 Content) 20 20 20 25 25 - 10 20 20 Water soluble alkali silicate Potassium silicate 10 - - 10 - - - - - Sodium Silicate - 10 - - - - - - - Lithium silicate - - 10 - 10 - 10 5 10 Aluminum hydroxide 6 6 6 6 6 - 6 6 2

(1) wear resistance

The specimens were left at room temperature for 20 days at a temperature of 20 ± 2 ℃ and a relative humidity of 65 ± 5%, followed by abrasion test. The wear test was performed 500 times using abrasive wheel H22 with a load of 500g using a TABER type abrasion tester according to KS M ISO 9352 (measurement of wear resistance by plastic-abrasive wheels) specified in the housing specification. After the weight loss was measured.

(2) compressive strength ratio

After curing the test specimens in the laboratory conditions, the compressive strength was measured and calculated as follows.

(3) water permeability

The dried test specimens were prepared by applying the impregnating material and the non-coating condition, and the impregnating material and the coating material.

In the permeation test, first, the mass (W) of the dried test piece was measured according to KS F 2451, and then the side surface of the test piece was waterproofed with paraffin or epoxy resin. After measuring the mass ( W 1) of the test piece in a state where the waterproofing material was completely cured, the permeability test apparatus shown in the photograph was used, and a circular permeable hole having a diameter of 50 mm was formed at a distance of about 10 mm or more in the center of both sides of the test piece. After uniformly tightening the rubber gasket, 10 N / cm 2 (1.02 kg / cm 2) of water pressure was applied from the upper surface during molding for 1 hour.

Remove the test piece under water pressure from the permeation test apparatus, wipe off any moisture on the surface, and measure the mass ( W 2). Permeability and permeability evaluation are calculated by the following equation.

Permeability (g) = W2-W1

(In the above formula, W1 is the mass (g) after curing in room air for 24 hours after application of the impregnating material to the test piece, and the mass (g) immediately after applying water pressure of 10 N / cm ² for W2 :).)

(4) water absorption

The sides of the specimens are waterproofed with paraffin or epoxy, and soaked in water of about 20 ℃ to a depth of about 2 ~ 10mm.

Weigh the specimens before and after soaking in water at regular intervals.

At this time, the water on the surface is removed by using a wet cloth.

The measurement time of water absorption may vary depending on the water absorption rate. Generally, it is 24 hours after soaking in water.

(5) Flame resistance (depth of salt penetration)

The test pieces were manufactured under the same conditions, and the specimens prepared by applying and impregnating materials were immersed in a 2.5% aqueous solution of sodium chloride for 7 days according to KS F 4930.

The temperature of the aqueous solution is 20 ± 2 ° C. Then, the test piece is taken out and dried at room temperature for 24 hours, and the test piece is divided into two parts. A 0.1 N aqueous solution of silver nitrate is sprayed on the cross section of the divided test piece, and a 1% aqueous solution of uranine is continuously added. By spraying, the depths of the three colored parts are measured by the salinity penetration depth.

division Abrasion Resistance (Weight Loss, mmg) Compressive Strength Ratio (%) Absorption amount (g / 24hr immersion) Water Resistance, g (1kgf / cm ² , 1hr) Salinity penetration depth (mm) Example 6 3,430 110 33.4 7.4 4.3 Example 7 3,610 107 35.8 10.3 6.5 Example 8 3,134 109 34.9 7.7 4.7 Example 9 2,847 113 32.4 6.8 3.8 Example 10 2,834 115 31.7 6.6 4.0 Comparative Example 4 4,240 100 38.5 16.8 15.6 Comparative Example 5 3,789 102 37.5 13.1 8.5 Comparative Example 6 3,874 107 35.4 9.3 7.9 Comparative Example 7 3,482 108 34.6 7.9 10.7

As a result of the above test, Examples 6 to 8 showed that the wear resistance, the compressive strength, the water resistance, and the flame resistance properties were all greatly improved as compared with Comparative Example 4 without applying the impregnant. Among the water-soluble silicates, potassium and lithium were somewhat better than sodium.

Example 9 and Example 10, wherein the silica content of colloidal silica is increased, it is shown that the wear resistance and the compressive strength characteristics are further improved. However, Comparative Example 5, in which silica was used low, showed that the overall physical properties were lowered.

Even if the water-soluble silicate content is small (Comparative Example 6), the wear resistance is somewhat lowered, and aluminum hydroxide has a great influence on the flame resistance, and therefore, in Comparative Example 7, in which the amount of addition is small, the mechanical properties are good but the resistance to salt penetration is poor.

As described above, in the present invention, water-soluble alkali silicates and ceramic powders are contained by inducing complex bonding by chelating agent, which is a disadvantage in that the coating strength of the water-based coating material has low binding strength, water fragility, and stable dispersion. By improving the bonding strength of the coating film to improve the mechanical properties and durability of the coating material.

In particular, the present invention reinforces the concrete floor through the penetration type impregnating agent having a composite reinforcing function, and in the conventional parking lot floor finishing material by double reinforcing action through the surface coating of the water-based dustproof finishing material given the coloring function. It has the effect of solving problems that may occur.

In addition, it is an environmentally friendly method that is high in affinity with concrete and harmless to humans and the environment due to the nature of aqueous materials, and has a feature of providing a flame retardant coating material composition which does not emit harmful gases even when exposed to fire.

Claims (9)

100 parts by weight of a colloidal silica dispersion solution having a silica (SiO ₂ ) content of 10-15 nm particle size of 15-30% by weight based on the weight of the silica dispersion solution, 7-15 parts by weight of water-soluble alkali silicate (Alkali metal silicate), hydroxide Impregnating agent containing 5-10 parts by weight of aluminum [Al (OH) ₃ ]; And 10-40% by weight of water-soluble alkali silicate, 0.2-4.0% by weight of suspending agent, 20-45% by weight of filler, 0.1-0.8% by weight of chelating agent, water 10 A coating material consisting of ~ 69.6% by weight, characterized in that the impregnating agent and the coating agent is used in sequence. delete delete The method of claim 1, The water-soluble alkali silicate M ₂ O: The finishing material for building, characterized in that the weight ratio of SiO ₂ : 1: 1.8 ~ 3.75. (M is one alkali metal selected from sodium, potassium and lithium.) The method of claim 1, The anti-settling agent is a building finish, characterized in that the colloidal magnesium aluminate silicate (Colloidal magnesium aluminate silicate) having a viscosity of 190 ~ 310cps. The method of claim 1, The filler is a building finishing material, characterized in that at least one selected from mica (mica) powder, calcium carbonate powder, titanium dioxide powder, silica powder. The method of claim 1, The filler is a building finish, characterized in that the mica (mica) powder is 6 to 30% by weight based on the total composition of the coating.  The method of claim 1, The chelating agent is at least one alkali soluble salts selected from alkylene-diamine-polyalkanoic acids and hydroxyalkyl alkylene-diamine-polyalkanoic acids. Building finishing material, characterized in that the mixture. Using the building finish of any one of claims 1 or 4 to 8, 100 parts by weight of a colloidal silica dispersion solution having a silica (SiO ₂ ) content of 10-15 nm particle size of 15-30% by weight based on the weight of the silica dispersion solution, 7-15 parts by weight of water-soluble alkali silicate (Alkali metal silicate), hydroxide 5 to 10 parts by weight of aluminum [Al (OH) ₃ ] step of impregnating the mixed impregnant on the concrete surface; And On the surface of the concrete impregnated with the impregnating agent, 10 to 40% by weight of water-soluble alkali silicate (Alkali metal silicate), 0.2 to 4.0% by weight of suspending agent, 20 to 45% by weight of filler, Chelating agent ) Finishing method for building comprising the step of forming a coating layer by applying a coating consisting of 0.1 to 0.8% by weight, 10 to 69.6% by weight of water.

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