KR100341935B1 - Inorganic compositions for the protection of concrete material - Google Patents

Abstract

The present invention relates to an inorganic coating composition having a stable coating function on the concrete surface.

In buildings, especially concrete buildings, water-based paints are used to maintain stable structures such as decoration and corrosion protection on the surface. Such an aqueous paint is composed of various pigments using an acrylic binder as a main adhesive component, and the expansion and contraction rate of the water-based coating is greater than that of the concrete to be adhered with the change of the air temperature, thereby causing a phenomenon in which the adhesive surface is peeled. Therefore, moisture penetrates into the gap created by the repetition of contraction and expansion, and it acts as a habitat for breeding various microorganisms in the hot and humid summer months, and corrosion occurs.

The present invention uses the cement, blast furnace slag, fly ash, etc., which enables strong bonding with concrete instead of the conventional water-based paint as a curing adhesive, cracks composed of a fiber having a polymer network structure, such as a waterproofing agent such as fatty acid salts of heavy metals. An inhibitor, a rheology modifier, a smoothing agent, a penetrant, a pigment, a thickening moisturizer, and the like were mixed, and a small amount of an acrylic binder was mixed as an organic adhesive component. Therefore, after coating on the concrete surface, the organic adhesive, which is weak against light and temperature change, is protected between the inorganic adhesive so that the original function is not damaged. The inorganic adhesive hardener exhibits a stable hard adhesive function and a waterproof, The stable coating structure according to the antibacterial function was able to be maintained for a long time.

Description

Inorganic compositions for the protection of concrete material

The present invention relates to an inorganic powder coating for coating the outer wall surface of a concrete structure. The present invention relates to a coating composition for protecting concrete exterior walls, in particular, to prevent peeling, antibacterial, weather resistance, adhesion, durability, wear resistance, breathability, waterproofness, environmental friendliness, and repainting of paint surfaces.

Concrete is a structure formed with cement as the main material. The cement is exposed to the outside, and is coated with various paints to improve aesthetics and waterproof properties. Water-based paint has been widely used as the most representative coating material. Conventional water-based paints are easy to install due to their good hiding power, workability and adhesion at the beginning of application. However, more than 50% of acrylic synthetic resin is used as the main adhesive material, and various pigments and waterproofing agents are used. Therefore, because it is exposed to the air, the temperature difference between winter and summer is so severe that shrinkage between paints made of synthetic resin compared to concrete inside. There are several times the difference in the degree of expansion, so that the surface coating layers, which have more expansion and contraction than concrete, are separated from each other. Therefore, as moisture penetrates and accumulates in the separated space, organic materials decay due to moisture in summer, causing various problems. In addition, the poor breathability is accelerating the neutralization rate of the concrete is becoming a factor to reduce the durability of the concrete.

In Korean Patent No. 206413 "Concrete Structure Surface Coating Agent", vinyl acetate, ethylene, and monoacrylic monomers are used as the main components of the surface coating component, and the use of inorganic materials is only intended to increase the weight while being bonded by the adhesive strength of vinyl. As a result, there is a characteristic that the adhesive strength is doubled by using various resins together, but in the end, synthetic resin and concrete are bonded as different heterogeneous components, but they are simple bonds and chemical bonding between homogeneous components. Is difficult. That is, after a certain period of time, separation between good materials will inevitably occur, and peeling and decay are inevitable.

Korean Patent Publication No. 99-707 discloses a technique that suppresses the occurrence of stains caused by decay or water penetration by compounding pigments in the back cement, but the pigment is blended in a simple back cement. Peeling phenomenon due to discoloration or freeze-thawing of the pigment due to the penetration of water inevitably occurs. In addition, as the bacteria grow between the peeled layers, staining occurs, and the aesthetics of the aesthetics are inevitable.

The present invention uses a hardening adhesive of inorganic material such as cement or gorslag as a main material, while blending a small amount of synthetic resin, an extender such as calcium carbonate, a crack prevention agent composed of a fine fibrous structure fiber, and improved flowability of the cement paste and permeability. Improved rheology modifiers and leveling agents were added, and new coating compositions were prepared by adding antimicrobial agents and heavy reinforcing agents such as titanium dioxide metal coatings and antimicrobial agents, and blast furnace slag or silica fume. Therefore, unlike the coating composition consisting of a simple organic adhesive, the stable pozzolanic material during the curing of the cement promotes the production of ettringite to be hardened to the same material as concrete, thereby making it possible to form a strong bond between the two. In addition, by securing the stability of fibrous structure of crack inhibitor, antiseptic function, and breathability of other components, it prevents the propagation of germs by moisture and secures the tight connection while fundamentally blocking the peeling phenomenon caused by temperature change during the winter season. To solve the shortcomings of the water-based paints had.

The present invention is the inorganic curing adhesive 10-50%, filler reinforcing agent 10-70%, synthetic resin adhesive 1-20%, strength reinforcing agent 1-30%, crack inhibitor 0.1-5%, antibacterial and bactericide 0.01-5%, moisture penetration inhibitor 0.1 to 5%, moisturizing thickener 0.001 to 3%, surfactant 0.001 to 3% and pigment 1 to 15%.

In the present invention, the inorganic cured adhesive has a moisture resistance of 10% or less, and any one of those having a particle size of 2000 cm 2 / g or more as a back cement, general cements such as 1.2.3.4.5 type cement, alumina cement, and other special cements. Alternatively, a mixture of two or more thereof may be used depending on the site characteristics of the place of introduction. If the amount used is less than 10%, the breathability and the desired adhesion cannot be obtained. If the amount is used more than 50%, the peeling phenomenon may occur during expansion and contraction due to the difference between the concrete skin surface and the remarkable expansion force.

Calcium carbonate and talc used as filler in the present invention has a particle size of 2000 cm 2 / g or more, less than 10% of the painting surface does not multiply, and when used more than 70% has a disadvantage of lowering the adhesive strength .

Adhesive composed of synthetic resin in the present invention is any one of acrylic powder, water-soluble acrylic silicone, water-soluble acrylic urethane, water-soluble acrylic epoxy, or a mixture thereof when less than 1% does not exhibit an adhesive function and the coating surface is too hard It is easily crushed by external impact, and when used more than 20%, the coated surface is densely constructed, but reversely impedes breathability, so that there is no difference with existing water-based paints.

When the strength enhancer of the present invention is less than 1% as one of calcium hydroxide, silica fume, blast furnace slag, fly ash, gypsum, or a mixture thereof, the strength is low and there is no effect on the formation of ettringite. When used a lot, the viscosity becomes too high or too low and the desired color cannot be achieved depending on the characteristics of the material itself. In other words, the stronger the hardness, the weaker the impact resistance. In the case of gypsum, there is a risk of staining due to overexpansion when excessive use occurs, and when used in a small amount, crack prevention or strength cannot be guaranteed.

In the present invention, the crack preventing agent is any one or a mixture of wood fiber, synthetic nonwoven fibers and natural nonwoven fibers having a length of 0.01 to 2 mm. If it is used less than 0.1%, it will not be able to achieve stable mesh formation on the coated surface and crack prevention effect will not be obtained. If it is used more than 5%, it will damage the aesthetics by the surface exposure of the partial fiber yarn, Clustering occurs.

In the present invention, the antimicrobial agent has poor water solubility, which is composed of siliceous salt, metal-coated titanium dioxide, polyhalogenated phenol, sodium benzolate, benzalkonium chloride, copper compound, chemical dieldrin, and the like due to light and heat caused by outdoor exposure. Permanent antibacterial function is to have. If the amount used is less than 0.01% can not achieve the desired sterilization and antibacterial effect, when used more than 5% there is a problem that only the environmental pollution is accelerated but does not affect the target sterilization and antibacterial effect and the cost increases.

In the present invention, the moisture permeation inhibitor is a metal salt of higher fatty acids, powder silane, any one or a mixture of siloxanes, and has a function of ensuring air permeability while preventing water permeation to the concrete surface. If it is used less than 0.1%, the desired penetration prevention function cannot be obtained, and if it is used more than 5%, the strength is decreased.

In the present invention, the moisturizing thickener is any one or a mixture of ethyl or methyl substituted cellulose, carboxymethyl cellulose, ethyl hydroxyethyl cellulose, carboxymethyl ethyl cellulose, hydroxypropyl cellulose, low molecular cellulose, cellulose ether, bentonite Proper retention of moisture and retention of viscosity facilitates brushing and spraying operations and prevents dripping during operation. Therefore, hardening defects and cracks are suppressed. If the amount used is less than 0.001%, the desired moisturizing thickening function cannot be obtained. If the amount is used more than 3%, the workability is greatly deteriorated due to excessive increase in viscosity.

The surfactant used in the present invention uses lignin sulfonic acid, naphthalene sulfonic acid, melamine sulfonic acid, polycarboxylic acid, biopoly, tartaric acid, casein, and promotes uniform coating on the concrete surface while improving the flow of paint. . If it is used more than 3%, hardening delay phenomenon occurs and it flows down before hardening, making it difficult to work, and when used excessively, it lowers the strength of the coated surface.

The coating composition of the present invention having the above composition will be described through specific examples.

Preparation Example 1

Based on the total weight, 30% of white cement, 10% of calcium hydroxide, 2% of silica fume, 34.2% of calcium carbonate and 8% of pigment (fat sugar) are homogeneously mixed in a dry state. Hydrophobic acrylic powder 8%, talc 1%, wood fiber 0.5%, fatty acid salt 1%, melaminesulfonic acid 0.5%, silane 0.5%, siloxane 0.5%, zinc silicate 2%, metal-coated titanium dioxide 0.5%, bentonite 1 %, Cellulose ether 0.3% is added in a dry state and mixed homogeneously with a blender.

It was prepared as follows by the same process as in the above-described manufacturing example.

Preparation Example 2 Preparation Example 3 Preparation Example 4 Preparation Example 5 Preparation Example 6 Preparation Example 7 Preparation Example 8 Preparation Example 9 Preparation Example 10 Inorganic Curing Adhesive Back Cement 40 Back Cement 40 Calcium Hydroxide 20 Type 1 Cement 153 Type Cement 15 Class 1 Cement 25 Alumina Cement 5 White Cement 20 Slag Cement 15 Slag Cement 30 Calcium Alumina Cement 5 5 types of cement 30 alumina cement 5 Special Cement 151 Type Cement 15 Filling enhancer Calcium Carbonate 24.7 Talc 5 Talc 29.6 Calcium Carbonate Calcium Carbonate 37.1 Calcium Carbonate 40.2 Calcium Carbonate39.3 Calcium Carbonate 22.2 Talc 5 Calcium Carbonate 24.5 Calcium Carbonate 36.2 Talc 6 Synthetic Resin Adhesive Acrylic Powder Resin 8 Acrylic Powder Resin 7 Acrylic urethane resin 7 Acrylic Silicone Resin 10 Acrylic Epoxy Resin 8 Acrylic resins 5 Acrylic silicone resins 5 Acrylic Silicone Resin 10 Acrylic Urethane Resin 10 Acrylic Silicone Resin 5 Acrylic Silicone Resin 12 Strength enhancer Calcium hydroxide 10 Silica fume 2 Antifoam 0.5 Calcium hydroxide 8 antifoaming agent 0.8 Silica Fume 2 Antifoam 0.5 Gypsum 5 Calcium hydroxide 10 Defoamer 0.5 Gypsum tetracalcium hydroxide 8 Antifoam 0.5 Gypsum 5.6 Antifoam 0.5 Fly Ash 10 Calcium Hydroxide 5 Silica fume 2 Gypsum 10 Silica fume 2 Antifoaming agent 1 Cracking Agent Wood fiber 0.5 Wood fiber 1 Gypsum 4 Wood fiber and acrylic 1: 1 mixture 1.5 1: 1 mixture between wood fiber and cotton fiber 0.5 Wood Fiber 0.5 Synthetic Fiber Nonwoven Fiber 0.5 Wood fiber 0.5 Natural non-woven textile yarn 0.5 Wood fiber 1.2 Equivalent mixture of wood fiber, natural fiber nonwoven and synthetic fiber nonwoven 1.5 Wood fiber 1.5 Antibacterial and Sterilization Zinc Fluoride 2 Metal Coated Titanium Dioxide0.5 Zinc fluoride 2 Metal Coated Titanium Dioxide0.5 Polyhalogenated Phenolic 0.5 Sodium Benzolate 1.5 Benzalkonium Chloride1.4 Copper Compound 3 Chemical Dieldrin3.6 Equivalent mixture of zinc fluoride and copper compound1.8

Moisture penetration inhibitor Sodium Stearate 1 Silane 0.5 Siloxane 0.5 Calcium Stearate 1 Silane0.5siloxane0.5 Silane 1 Magnesium Stearate0.5 Siloxane 1.5 Sodium Stearate 1-siloxane 0.3 Siloxane 1.5 Silane 1 Sodium Stearate0.5 Aluminum stearate 2 Moisturizing Thickener Cellulose ether 0.3 bentonite 1 Cellulol ether 0.5 bentonite 1 Methyl Cellulose 0.3 Bentonite 1 Ethylcellulose0.5 Carboxymethylcellulose 0.3 Cellulose ether 0.2 Ethyl cellulose 0.2 Bentonite 1.5 Bentonite 1 Ethylcellulose 0.3 Bentonite 2 Surfactants Melaminesulfonic acid0.5 Menlaminsulfonic Acid0.4 Polycarboxylic acid0.5 Naphthalenesulfonic Acid0.4 Organic acid 1 Casein0.5 Tataric Acid 0.1 Melamine 0.5 Polycarboxylic acid 0.5 lignin acid 0.1 Biopoly0.5 Pigment Chromium Oxide 3.0 5 per share 8 per share Oxidation black 4 Iron oxide 4 Isoindolinone 5 Titanium Black 5 Ultra Marine Blue 5 4 Titanium Black 1

In order to compare with the preparation examples described above it was prepared in the same ratio as the following table.

Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Comparative Example 5 Comparative Example 6 Comparative Example 7 Comparative Example 8 Comparative Example 9 Comparative Example 10 Inorganic Curing Adhesive Back Cement 60 Same as Manufacturing Example 1 Same as Manufacturing Example 1 Same as Manufacturing Example 1 Same as Manufacturing Example 1 Same as Manufacturing Example 1 Same as Manufacturing Example 1 Same as Manufacturing Example 1 Same as Manufacturing Example 1 Same as Manufacturing Example 1 Filling enhancer Calcium Carbonate4.2 Calcium Carbonate. 2 Calcium Carbonate17.2 Calcium Carbonate29.2 Calcium Carbonate29.2 Calcium Carbonate36.2 Calcium Carbonate31 Calcium Carbonate Calcium Carbonate Calcium Carbonate27.2 Synthetic Resin Adhesive Same as Manufacturing Example 1 Same as Manufacturing Example 1 Acrylic resin 25 Same as Manufacturing Example 1 Same as Manufacturing Example 1 Same as Manufacturing Example 1 Same as Manufacturing Example 1 Same as Manufacturing Example 1 Same as Manufacturing Example 1 Same as Manufacturing Example 1 Strength enhancer Same as Manufacturing Example 1 Silica Fume31 Same as Manufacturing Example 1 Same as Manufacturing Example 1 Same as Manufacturing Example 1 Same as Manufacturing Example 1 Same as Manufacturing Example 1 Same as Manufacturing Example 1 Same as Manufacturing Example 1 Same as Manufacturing Example 1 Cracking Agent Same as Manufacturing Example 1 Same as Manufacturing Example 1 Same as Manufacturing Example 1 Cotton fiber 5.5 Same as Manufacturing Example 1 Same as Manufacturing Example 1 Same as Manufacturing Example 1 Same as Manufacturing Example 1 Same as Manufacturing Example 1 Same as Manufacturing Example 1 Antibacterial and fungicides Same as Manufacturing Example 1 Same as Manufacturing Example 1 Same as Manufacturing Example 1 Same as Manufacturing Example 1 Same as Manufacturing Example 1 Zinc Fluoride0.005 Same as Manufacturing Example 1 Same as Manufacturing Example 1 Same as Manufacturing Example 1 Same as Manufacturing Example 1 Moisture Penetrant Same as Manufacturing Example 1 Same as Manufacturing Example 1 Same as Manufacturing Example 1 Same as Manufacturing Example 1 Same as 1 in manufacturing Same as Manufacturing Example 1 Same as Manufacturing Example 1 Same as Manufacturing Example 1 Same as Manufacturing Example 1 Same as Manufacturing Example 1 Moisturizing Thickener Same as Manufacturing Example 1 Same as Manufacturing Example 1 Same as Manufacturing Example 1 Same as Manufacturing Example 1 Same as Manufacturing Example 1 Same as Manufacturing Example 1 Cellulose Ether 3.5 Bentonite 4 Same as Manufacturing Example 1 Same as Manufacturing Example 1 Surfactants Same as Manufacturing Example 1 Same as Manufacturing Example 1 Same as Manufacturing Example 1 Same as Manufacturing Example 1 High Fatty Acids6 High Fatty Acids6 Same as Manufacturing Example 1 Same as Manufacturing Example 1 Melamine 5 Same as Manufacturing Example 1 Pigment Same as Manufacturing Example 1 Same as Manufacturing Example 1 Same as Manufacturing Example 1 Same as Manufacturing Example 1 Same as Manufacturing Example 1 Same as Manufacturing Example 1 Same as Manufacturing Example 1 Same as Manufacturing Example 1 Same as Manufacturing Example 1 15 per share

Test results for air permeability, waterproofness, antimicrobial activity, adhesive strength, cracking and freeze-thawing resistance of the coating composition prepared according to the above production and comparative examples are as follows.

Waterproof test Breathability test Antimicrobial test Adhesion Strength Test Crack generation test Freeze thaw resistance Preparation Example 1 Absorption Ratio 0.45 7.5% No mold occurrence 8.7㎏ / ㎠ clear Relative dynamic modulus of elasticity 88 Preparation Example 2 Absorption Ratio 0.44 7.7% No mold occurrence 8.5㎏ / ㎠ clear Relative dynamic modulus of elasticity 89 Preparation Example 3 Absorption Ratio 0.47 7.5% No mold occurrence 8.5㎏ / ㎠ clear Relative dynamic modulus of elasticity 88 Preparation Example 4 Absorption Ratio 0.35 4.5% No mold occurrence 4.5㎏ / ㎠ clear Relative dynamic modulus of elasticity 90 Preparation Example 5 Absorption Ratio 0.45 6.7% No mold occurrence 8.6㎏ / ㎠ clear Relative dynamic modulus of elasticity 85 Preparation Example 6 Absorption Ratio 0.46 7.4% No mold occurrence 8.6㎏ / ㎠ clear Relative dynamic modulus of elasticity 85 Preparation Example 7 Absorption Ratio 0.49 6.8% No mold occurrence 8.5㎏ / ㎠ clear Relative dynamic modulus of elasticity 85 Preparation Example 8 Absorption Ratio 0.38 6.7% No mold occurrence 8.7㎏ / ㎠ clear Relative dynamic modulus of elasticity 89 Preparation Example 9 Absorption Ratio 0.41 7.6% No mold occurrence 8.7㎏ / ㎠ clear Relative dynamic modulus of elasticity 89 Preparation Example 10 Absorption Ratio 0.39 7.0% No mold occurrence 8.5㎏ / ㎠ clear Relative dynamic modulus of elasticity 90

Test Results for Comparative Example

Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Comparative Example 5 Comparative Example 6 Comparative Example 7 Comparative Example 8 Comparative Example 9 Comparative Example 10 Crack Kneading not partial bunching Good paintability but poor breathability Wood chips on the surface Robbery Corroded by mold Inability to work due to increased viscosity Inability to work due to increased viscosity Coating surface is spilled Good whiteness but poor adhesion

The above test was made by mixing 40% of water with respect to the weight of the coating composition.

* .Remarks: 1) The above breathability test is based on Korean KSL 3317.

2) The water resistance test was performed by KSF 2451 in Korea, and after 1 day of manufacturing the cement mold, the mold was demolished for 21 days after demolding at a temperature of 21 to 23 ° C. and a relative humidity of 85% for 14 days after applying the coating composition of the present invention. One was used. The test method compares the weight after immersion in water for 24 hours.

3) Antibacterial and bactericidal properties prepared by specimens of width × length × height = 10 × 10 × 5 ㎝ to inoculate the fungus bacteria on the coating composition of the present invention and uncoated, respectively, 32 ~ 33 ℃, The result of incubation for 30 days with 95% humidity is shown.

4) Adhesion strength test is to produce a specimen of 65 × 65 × 25mm size by KSL5100, and then apply 0.3㎏ / ㎡ (thickness about 0.3mm) to the present invention on it, then the relative humidity 85%, the temperature 21 ~ 23 After curing for 12 days at ºC, use 5.8.2 of KSF4715 (light finish wall coating material). Take out the test specimen one day before the test, and fasten the upper jig firmly with adhesive in a sufficiently dry state. Five specimens were tested, but three average values were obtained except the maximum and minimum values.

5) The crack generation test was observed for 60 days by applying the amount of 0.3kg / ㎡ to the existing concrete retaining wall by selecting the width × length = 10m × 5m.

6) Resistance test for freezing and thawing is the average value of 200 times of repeated freezing and thawing by applying to the mold of freeze-melting concrete by KSF2456. (Daedong's modulus is over 80)

As shown in the above test results, the coating composition prepared by the composition ratio of the present invention exhibits incomparable stability in terms of breathability, waterproofness, antimicrobial activity, adhesive strength, crack generation and freeze-thawing resistance.

Claims (3)

10-50% by weight of inorganic adhesive hardener, which is any one of back cement, 1.2.3.4.5 type cement, alumina cement, other special cement, or a mixture of two or more thereof, 10 to 70% by weight of a filler adjuvant which is either calcium carbonate or talc or a mixture thereof, 1 to 20% by weight of a synthetic resin adhesive, which is any one or a mixture of acrylic powder, water-soluble acrylic silicone, water-soluble acrylic urethane, water-soluble acrylic epoxy, 1 to 30% by weight of a strength enhancer which is any one of calcium hydroxide, silica fume, blast furnace slag, fly ash, gypsum or a mixture thereof, 0.1 to 5% by weight of a crack prevention agent which is any one or a mixture of wood fiber, synthetic nonwoven fibers and natural nonwoven fibers, Water-insoluble antibacterial and fungicides comprising any or a mixture of water-insoluble silicate salts, metal-coated titanium dioxide, polyhalogenated phenol, sodium benzolate, benzalkonium chloride, copper compound, chemical dieldrin 0.01 to 5 weight%, 0.1 to 5% by weight of a moisture penetration inhibitor which is any one or a mixture of metal salts, powder silanes and siloxanes of higher fatty acids, 0.001 to 3% by weight of a moisturizing thickener which is any or a mixture of ethyl or methyl substituted cellulose, carboxymethylcellulose, cellulose ether, bentonite, A coating composition for protection of concrete exterior walls, comprising 0.001 to 3% by weight of a surfactant which is any one or a mixture of lignin sulfonic acid, naphthalene sulfonic acid, melamine sulfonic acid, polycarboxylic acid, biopoly, tartaric acid, and casein. The method of claim 1, A coating composition for protecting concrete exterior walls, characterized in that the moisture resistance of the inorganic cured adhesive is 10% or less and has a particle size of 2000 cm 2 / g or less. The method of claim 1, A crack preventing agent is a coating composition for protecting concrete walls, characterized in that the length of 0.01 ~ 2mm.