KR102620504B1 - Water-based anti-neutralization highly elastic crack repair composition with excellent low-temperature flexibility and tensile strength - Google Patents

Abstract

The present invention relates to a water-based neutralization-resistant, highly elastic crack repair material composition with excellent low-temperature flexibility and tensile strength.
An aqueous anti-neutralization, high-elasticity crack repair composition with excellent low-temperature flexibility and tensile strength according to an embodiment of the technical idea of the present invention includes acrylic emulsion resin, calcium carbonate, titanium dioxide (TiO ₂ ), fiber additives, and nanocellulose. , rubber, plaster, dispersant and freeze stabilizer.
With the above-described structure, the water-based anti-neutralization, high-elasticity crack repair material composition with excellent low-temperature flexibility and tensile strength according to various embodiments of the technical idea of the present invention maintains high elasticity while maintaining excellent tensile strength and flexibility and crack resistance even at low temperatures such as winter. By exerting this, carbonation of concrete can be effectively prevented.

Description

Water-based anti-neutralization highly elastic crack repair composition with excellent low-temperature flexibility and tensile strength

The present invention relates to an aqueous neutralization-resistant, high-elasticity crack repair material composition with excellent low-temperature flexibility and tensile strength. More specifically, it maintains high elasticity while maintaining high tensile strength and exhibits flexibility and crack resistance even at low temperatures such as winter, thereby preventing carbonation of concrete. It relates to a water-based anti-neutralization, high-elasticity crack repair material composition with excellent low-temperature flexibility and tensile strength that can effectively prevent.

Even paint films that are generally elastic have reduced crack resistance due to lower flexibility due to temperature in winter, and carbonation of concrete may intensify due to the intrusion of moisture and carbon dioxide into the cracks.

Due to climate change, not only has the temperature drop in domestic winters become very low, but it has also become longer, so there is a need for crack repair materials for exterior walls that maintain a certain degree of flexibility in the coating film even in winter.

Crack repair materials, which are mainly used as crack repair materials for exterior walls, are mostly composed of acrylic emulsions with a low Tg (glass transition temperature). In this case, the lower the glass transition temperature of the coating film, the more flexibility it exhibits at that temperature, but the tensile strength of the coating film In addition, it is lowered in inverse proportion, preventing the physical properties from being displayed properly.

As a way to supplement the existing tensile strength, there are cases where the solution is to blend an acrylic emulsion with a high glass transition temperature or another type of resin with excellent tensile strength. However, in this case, the elongation rate is damaged or even if the elongation rate is high, the coating film can be used at extremely low temperatures. Due to its low flexibility, there are cases where it does not perform its role of crack resistance properly in winter.

To compensate for this, there is a method of using a plasticizer to forcibly increase the low-temperature elongation rate, but this may cause the plasticizer to seep onto the surface of the top coat in the long term, causing stickiness of the surface of the coat, causing external contamination.

Therefore, a high-elasticity crack repair material composition that fundamentally prevents the occurrence of the lifting phenomenon of the repair material that fills the crack part of the structure, maintains flexibility even at low temperatures, has excellent tensile strength, and can secure the stability and durability of the structure. There is a dire need for development.

Domestic Registered Patent No. 10-1987927 (registered on June 4, 2019) Domestic Registered Patent No. 10-2336116 (registered on December 2, 2021) Domestic registered patent No. 10-2207899 (registered on January 20, 2021)

The problem to be solved by the present invention is to prevent aqueous neutralization with excellent low-temperature flexibility and tensile strength that can effectively prevent carbonation of concrete by maintaining high elasticity while maintaining high tensile strength and demonstrating flexibility and crack resistance even at low temperatures such as winter. The object is to provide a highly elastic crack repair material composition.

In addition, another problem that the present invention aims to solve is to prevent the appearance of heterogeneity with the surface of the concrete structure, improve physical properties such as adhesion, tensile strength, bending strength, and impact resistance, and secure the stability and durability of the structure. The aim is to provide a water-based neutralization-resistant, high-elasticity crack repair material composition with excellent low-temperature flexibility and tensile strength.

The various problems to be solved by the present invention are not limited to the problems mentioned above, and other problems not mentioned will be clearly understood by those skilled in the art from the description below.

In one embodiment of the technical idea of the present invention, a water-based anti-neutralization, high-elasticity crack repair material composition with excellent low-temperature flexibility and tensile strength is disclosed.

The water-based anti-neutralization, high-elasticity crack repair composition with excellent low-temperature flexibility and tensile strength contains acrylic emulsion resin, calcium carbonate, titanium dioxide (TiO ₂ ), fiber additives, nanocellulose, rubber, gypsum, dispersant, and freeze stabilizer. Includes.

40 to 50 parts by weight of the acrylic emulsion resin, 40 to 60 parts by weight of calcium carbonate, 1 to 5 parts by weight of titanium dioxide (TiO ₂ ), 1 to 3 parts by weight of fiber additive, 3 to 7 parts by weight of nanocellulose, It may be included in a weight ratio of 0.1 to 1 part by weight of rubber, 0.5 to 1.5 parts by weight of gypsum, 0.1 to 1 part by weight of dispersant, and 0.1 to 0.5 parts by weight of freeze stabilizer.

Specific details of other embodiments are included in the detailed description.

The water-based neutralization-resistant, high-elasticity crack repair material composition with excellent low-temperature flexibility and tensile strength according to various embodiments of the technical idea of the present invention maintains high elasticity while maintaining high tensile strength and exhibits flexibility and crack resistance even at low temperatures such as winter, thereby making concrete Carbonation can be effectively prevented.

In addition, the water-based neutralization-resistant, high-elasticity crack repair material composition with excellent low-temperature flexibility and tensile strength according to various embodiments of the technical idea of the present invention prevents the formation of a feeling of heterogeneity with the surface of the concrete structure and has excellent adhesion, tensile strength, bending strength, and impact resistance. It can improve the physical properties of the structure and ensure the stability and durability of the structure.

It will be fully understood that various embodiments of the technical idea of the present invention can provide various effects that are not specifically mentioned.

The advantages and features of the present invention, and methods for achieving them, will become clear with reference to the embodiments described in detail below. However, the present invention is not limited to the embodiments described herein and may be embodied in other forms. Rather, the embodiments introduced herein are provided so that the disclosure will be thorough and complete and so that the spirit of the invention can be sufficiently conveyed to those skilled in the art.

The terms used in this application are only used to describe specific embodiments and are not intended to limit the invention. Singular expressions include plural expressions unless the context clearly dictates otherwise.

Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as generally understood by a person of ordinary skill in the technical field to which the present invention pertains. Terms defined in commonly used dictionaries should be interpreted as having a meaning consistent with the meaning in the context of the related technology, and should not be interpreted as having an ideal or excessively formal meaning unless explicitly defined in the present application. No.

Hereinafter, a water-based anti-neutralization highly elastic crack repair composition with excellent low-temperature flexibility and tensile strength according to an embodiment of the technical idea of the present invention will be described in detail with preferred embodiments.

An aqueous anti-neutralization, high elasticity crack repair composition with excellent low-temperature flexibility and tensile strength according to an embodiment of the technical idea of the present invention includes acrylic emulsion resin, calcium carbonate, titanium dioxide (TiO ₂ ), fiber additives, nano cellulose, Contains rubber, gypsum, dispersants and freeze stabilizers.

In addition, an aqueous anti-neutralization highly elastic crack repair composition with excellent low-temperature flexibility and tensile strength according to an embodiment of the technical idea of the present invention includes 40 to 50 parts by weight of the acrylic emulsion resin, 40 to 60 parts by weight of calcium carbonate, 1 to 5 parts by weight of titanium dioxide (TiO ₂ ), 1 to 3 parts by weight of fiber additive, 3 to 7 parts by weight of nanocellulose, 0.1 to 1 part by weight of rubber, 0.5 to 1.5 parts by weight of gypsum, 0.1 to 1 part by weight of dispersant, and freezing. The stabilizer may be included in a weight ratio of 0.1 to 0.5 parts by weight.

The acrylic emulsion resin has the advantages of low film formation temperature and excellent flexibility without using a plasticizer, as well as excellent weather resistance and abrasion resistance. The acrylic emulsion resin can be manufactured by the following method.

That is, the acrylic emulsion resin is prepared at a polymerization temperature in a polymerization reactor equipped with a stirrer, heater, cooler, and condenser necessary to proceed with the polymerization reaction, and a nitrogen purge means for creating and maintaining the oxygen atmosphere in the polymerization reactor into an inert nitrogen atmosphere. Maintained at 90-95°C, acrylic monomer, functional monomer, phosphorus monomer, methacrylic acid, and catalyst were added in the presence of alcohol and water and reacted for 3-7 hours to obtain a reactant. Water and a neutralizing agent were added to the reactant. It can be manufactured by dispersing in water after injection.

The acrylic monomer may be at least one selected from the group consisting of methyl (meth)acrylate, ethyl (meth)acrylate, butyl (meth)acrylate, 2-ethylhexyl acrylate styrene, and acrylonitrile monomer. .

The functional monomer can be used to improve the water resistance and adhesion to the substrate of the acrylic emulsion resin. The functional monomer improves the reactivity with methacrylic acid contained in the acrylic emulsion resin and binds to the acrylic emulsion resin in a network shape. Adhesion can be improved.

For example, the functional monomers include 2-hydroxy methyl acrylate, 2-hydroxyethyl (meth)acrylate, glycidyl (meth)acrylate, aryl (meth)acrylate, hydroxy propyl acrylate, At least one selected from the group consisting of aryl (meth)acrylate and hydroxypropyl acrylate may be used, and the functional monomer may be included in an amount of 25 to 35 parts by weight based on 100 parts by weight of the total acrylic monomer content.

The phosphorus-based monomer may be used to improve adhesion to concrete structures or metals and improve rust prevention of concrete structures or metals. For example, the phosphorus-based monomers include mono alkyl phosphate or dialkyl phosphate. (Di alkyl phosphate) may be used, and the phosphorus-based monomer may be included in an amount of 3 to 7 parts by weight based on 100 parts by weight of the total acrylic monomer content.

Specifically, the phosphorus-based monomers include bis[2-(methacryloxy)ethyl] phosphate (Bis[2-(methacyloyloxy)ethyl] phosphate, DMEP), 2-(methacryloxy)ethyl phosphate (2-(methacryloyloxy) Any one or more selected from the group consisting of ethyl phosphate (MMEP) and tris(2-methacryloyloxy)ethyl phosphate (TMEP) may be used.

The methacrylic acid can be used to improve adhesion by polymerizing with the acrylic monomer and to induce water dispersibility by saponifying the carboxyl group. For example, the methacrylic acid is used in an amount of 10 to 100 parts by weight based on 100 parts by weight of the total content of the acrylic monomer. It may contain 20 parts by weight.

The catalyst can be used to promote the polymerization reaction by ring-opening the double bond of the monomer. Examples of the catalyst include Benzoyl Peroxide (BPO), 2,2'-Azobisisobutyronitrile (AIBN), and Di-Tert-Butyl Peroxide (DTBPO). At least one or more selected from the group consisting of may be used, and the catalyst may be included in an amount of 0.1 to 1 part by weight based on 100 parts by weight of the total acrylic monomer content.

The neutralizing agent may be used to adjust the pH of the acrylic emulsion resin formed by polymerizing the monomer to a certain range. For example, the neutralizing agent is known as AMP (2-AMINEO-2-METHYL-1-PROPANOL)- 95 may be used, and the neutralizing agent may be included in an amount of 1 to 5 parts by weight based on 100 parts by weight of the total content of the acrylic monomer.

The Tg (glass transition temperature) of the acrylic emulsion resin prepared through the above process may range from -30 to -15°C. If the Tg (glass transition temperature) of the acrylic emulsion resin is less than -30°C, the low temperature The flexibility of the coating film may be excellent, but due to the stickiness of the coating film, contamination may occur before topcoating and at the same time, roller workability may be weak, and when the Tg (glass transition temperature) exceeds -15°C. Since the flexibility of the coating film cannot be expected in the harsh cold of winter, it may be difficult to prevent neutralization through crack repair due to weak crack resistance.

In addition, the solid content in the acrylic emulsion resin may be 20 to 30% by weight. If the solid content is less than 20% by weight, the pigment content must be increased to maintain the solid content of the overall design, which may cause a problem of reduced elongation. If it exceeds 30% by weight, considering that the solid content of the general acrylic emulsion resin itself is 50 to 60% by weight, there is no room for pigment input, so the overall solid content is designed to be low, resulting in poor crack repair performance. may occur.

The calcium carbonate is used as an inorganic filler included in a crack repair material composition, and can play a role in increasing initial adhesion by increasing apparent viscosity and improving heat resistance and durability.

The calcium carbonate has the chemical formula CaCO ₃ and is the most abundant among salts that exist in nature, and its forms are diverse, including marble, calcite, quartz, limestone, chalk, glacial limestone, seashells, eggshells, etc. It may exist as coral, etc. The calcium carbonate is generally a colorless crystal or white solid, has a specific gravity of 2.93, can be decomposed at 825°C, and when heated, carbon dioxide (CO ₂ ) is generated and quicklime can be obtained (CaCO ₃ → CaO + CO ₂ ↑).

The calcium carbonate can be widely used in the industrial field because it is cheap and has a low specific gravity. The calcium carbonate is a limestone marble and can be used as a neutralizing agent for cement, calcium oxide, and building materials. Aleurone is used in white pigments and water-based paints, and precipitated calcium carbonate is used in pigments, paints, toothpaste, etc., and can also be mixed into rubber as a reinforcing agent.

The calcium carbonate may be included in a weight ratio of 40 to 60 parts by weight in the total content of the highly elastic crack prevention repair material composition. If the content of the calcium carbonate is less than 40 parts by weight, a problem of weakening crack filling may occur, and 60 parts by weight If it is included in excess of the amount, the pigment content may increase compared to the acrylic emulsion resin input, making it difficult to expect a basic elongation rate.

In addition, the calcium carbonate preferably has an average particle size in the range of 8 to 20㎛. If the particle size of the calcium carbonate is less than 8㎛, the elongation rate is affected due to an increase in oil absorption due to the high specific surface area, and if it exceeds 20㎛, the calcium carbonate has an average particle size of 8 to 20㎛. Although oil absorption is small, a problem may arise due to insufficient filling properties as a highly elastic crack repair material.

The titanium dioxide (TiO ₂ ) can exhibit catalytic activity by absorbing light energy, and the strong oxidizing power generated at this time oxidizes and decomposes harmful substances emitted from sweat, waste, and secretions of the human body. Titanium dioxide is mainly used to purify organic polluted water by using its properties to decompose bacteria, microorganisms, and organic substances.

In the present invention, it is preferable that the titanium dioxide has a rutile-type crystal structure. When using titanium dioxide having an anatase-type crystal structure, when it is exposed to sunlight for a long period of time due to a delay in exterior wall painting work, the crack repair material is used due to the photocatalytic effect. There is a risk of decomposing the acrylic emulsion resin contained within.

In addition, in the present invention, the titanium dioxide may be included in a weight ratio of 1 to 5 parts by weight in the total content of the crack repair material composition, but if the titanium dioxide is included in less than 1 part by weight, a problem of poor concealment of the crack repair material may occur. If it is included in more than 5 parts by weight, there is no problem in the design of the crack repair material composition, but the problem of low price competitiveness may occur due to the high unit price.

The fiber additive is made of recycled fiber yarn and may be included in a weight ratio of 1 to 3 parts by weight in the total content of the crack repair material composition. The fiber additive provides construction stability that prevents the material from sagging or falling during construction of the crack repair material, and prevents cracks from forming. It can be integrated with the repair material to increase crack resistance and provide dimensional stability.

For example, the recycled fiber yarn improves the physical properties such as durability, strength, and adhesiveness of the crack repair material, and may have a length of 10 to 1000㎛. If the recycled fiber yarn is included in less than 1 part by weight, it can be used at low temperatures. It is not effective in strengthening low-temperature properties such as cracks, and if it is included in excess of 3 parts by weight, it may cause agglomeration of fibers and the need for excess acrylic emulsion resin, resulting in excessive binder.

In addition, the fiber additive can be used as a recycled fiber yarn manufactured by collecting and processing ton bag fabric. In general, ton bags (grain gunny bags, gunny sacks) are used for agricultural products, grains, fertilizers, minerals, chemical raw materials, etc. It refers to storing contents in large quantities, and is used when transporting or packaging contents for loading and storage.

Specifically, the conventional tone bag is made of polypropylene (PP) film yarn on the side and bottom parts so that it can contain a certain amount of agricultural products, grains, fertilizers, minerals, chemical raw materials, etc., and the side part is opened with the top open. It consists of a string of a certain length at the upper end and several rings at each corner of the side to move the tone bag containing the grains.

The recycled fiber yarn can be used as a recycled fiber yarn manufactured by the following method.

First, in order to manufacture the recycled fiber yarn, tone bag fabric that is discarded as an industrial by-product after use can be collected.

The discarded tone bag fabric may be a densely woven polypropylene (PP) film yarn fabric. The PP film yarn fabric discarded as an industrial by-product may be a fabric to which foreign substances or contaminants are attached and has a rough texture. .

Next, the collected tone bag fabric can be washed.

By washing the collected tone bag fabric, foreign substances or contaminants attached to the tone bag fabric can be removed. For example, the washing involves washing the collected tone bag fabric with sodium bicarbonate (NaHCO ₃ ) solution and grapefruit seed extract. Foreign substances or contaminants attached to the tone bag fabric can be removed by washing using a mixed solution mixed at a weight ratio of 95:5.

The sodium bicarbonate (NaHCO ₃ ) solution may be purified water in which sodium bicarbonate (NaHCO ₃ ) is dissolved and has a concentration range of 3 to 7 (w/w)%. The sodium bicarbonate is also used as a food additive. , It is non-toxic and has functions such as penetration, diffusion, and expansion.

In the present invention, by washing the collected tone bag fabric using the sodium bicarbonate solution, the cell wall of the mold expands to sterilize the tone bag fabric and at the same time, foreign substances, etc. can be washed and removed.

In addition, the grapefruit seed extract (GSE) has antibacterial, antifungal, and antioxidant effects, and in toxicity tests, it was confirmed to be almost non-toxic compared to sodium benzoate and potassium sorbate. In particular, among the components of the grapefruit seed extract, ascorbic acid, ascorbyl palmitate, and tocopherol weaken the function of the cell walls and membranes of putrefactive and pathogenic microorganisms, inhibit enzyme activity, and prevent cell proliferation mechanisms originating from DNA/RNA, thereby preventing bacteria. , it has a sterilizing effect on yeast and mold, and has an inhibitory effect on the growth and toxin synthesis of mold.

Next, the washed tone bag fabric can be softened by immersing it in an immersion liquid and then spraying it with steam.

In general, tone bag fabric has high strength and a rough surface texture in order to store contents such as agricultural products, grains, fertilizers, minerals, chemical raw materials, etc. in large quantities. The washed tone bag fabric is immersed in an immersion solution and then steamed. By spraying and softening, the texture of the surface of the tone bag fabric can be created smoothly.

Specifically, the softening is performed by immersing the washed tone bag fabric in an immersion liquid at a temperature of 30 to 40° C. for 10 to 30 minutes, then separating the fabric, and steaming the separated tone bag fabric at a temperature of 130 to 150° C. for 10 to 30 minutes. This can be done by spraying while.

The immersion liquid may include purified water, ethanol, hypochlorous acid (HOCl), and chlorine dioxide. Specifically, the immersion liquid includes 500 to 700 parts by weight of purified water, 10 to 50 parts by weight of ethanol, and 1 part by weight of hypochlorous acid (HOCl). It may be included in a weight ratio of 3 to 3 parts by weight and 0.1 to 1 part by weight of chlorine dioxide water.

The purified water can be mixed by dissolving and uniformly dispersing the composition constituting the immersion liquid.

The ethanol is a colorless, flammable compound, a type of alcohol, and the main ingredient in alcohol. Its chemical formula is C ₂ H ₆ O, and it can be mixed with water or ether. When burned, it generates a transparent, light blue flame and produces water and carbon dioxide. Steam is explosive and is sometimes used as fuel in some internal combustion engines. Ethanol is the basis of the alcoholic beverage industry, is involved in various industrial processes, and is widely used as a solvent, disinfectant, and fuel.

The ethanol has excellent deodorizing effect, deodorizing power, sterilizing power, deodorizing power, and antibacterial power against inorganic and organic substances, etc., and improves volatility to minimize contamination and residual sensation that may be caused by remaining with contaminants on the target surface.

The hypochlorous acid (HClO) has approximately 70 times the sterilizing power of sodium hypochlorite (NaOCl), and can be used safely because it does not produce tri-halo-methane (THM), a characteristic of chlorine-based disinfectants, and is approved by the Korea Food and Drug Administration. It is a disinfectant selected by the Ministry of Safety and Security as a food disinfectant and can be used in various fields such as the food industry, agriculture, and medical devices.

The aqueous chlorine dioxide can be prepared, for example, using powdered sodium chlorite and hydrogen chloride solutions, and can be prepared using sodium chlorine solution and hydrogen chloride solution, but is not limited to this. Additionally, the chlorine dioxide solution may have a concentration of 50 to 150 ppm.

The chlorine dioxide water is not highly toxic, is safe, and does not cause pollution, so it is environmentally friendly. Since it has a strong oxidizing effect, it is used as a sterilizing agent for purified water or as a bleaching agent or deodorizer for paper, fiber, and food.

Subsequently, the softened tone bag fabric can be dried.

The drying may remove moisture remaining on the surface of the softened tone bag fabric by drying the softened tone bag fabric at a temperature of 60 to 70° C. for 2 to 8 hours.

Next, the dried toned bag fabric can be pulverized to produce recycled fiber yarn.

The reactivated fiber yarn can be manufactured by pulverizing the dried toneback fabric into length units of 10 to 1000㎛. For example, the configuration of pulverizing the dried toneback fabric is a known technology, so for convenience of explanation and this For the sake of the technical idea of the invention, detailed description thereof will be omitted.

The nanocellulose can be included in the crack repair material composition to increase tensile strength while maintaining the flexibility of the low-temperature coating film. The cellulose may be included in a weight ratio of 3 to 7 parts by weight based on the total content of the crack repair material composition.

Cellulose is the main component of plant cell walls and plays a role in protecting against external stimuli. Nanocellulose refers to rod-shaped particles or fibers made up of bundles of such cellulose chains, and is mainly made by splitting cellulose extracted from wood into nano units. .

The nanocellulose has many hydroxy (OH) groups and has a very high surface area, forming a three-dimensional network and OH hydrogen bonds inside the material. Therefore, it increases the strength of the material and at the same time has an effect on improving barrier properties, crack prevention, and flow properties. As a result, nanocellulose is a raw material that is being researched and applied as a new material based on sustainable plant resources in various fields such as nanocellulose plastic, cosmetics, paper, and cement.

In the present invention, the nanocellulose is preferably a microfibril-structured nanocellulose with a thickness of 3 to 50 nm, a length of 1 to 5 ㎛, and an oil absorption of 50 to 300 m ² /g. When the thickness of the nano cellulose is less than 3 nm, the required crack Although it can be expected to improve the strength of the repair material, it may not be easily dispersed and stabilized within the crack repair material, which may lead to a problem of deterioration in physical properties. If the thickness of the nanocellulose exceeds 50 nm, it is stable within the crack repair material composition, but The hydrogen bonds are relatively weak, so the expected physical properties are not achieved.

In addition, if the oil absorption of the nanocellulose is less than 50 m ² /g, hydrogen bonding is not sufficiently exerted, and if it exceeds 300 m ² /g, the stability is low and agglomeration easily occurs, which causes a problem in which the expected physical properties are not achieved. You can.

In the present invention, it is preferable to add the nano-cellulose separately as nano-dispersion in water or to apply nano-water-dispersed raw material. In this case, the concentration of nano-dispersion is preferably 1 to 30% by weight.

The production of general water-based paints relies only on high-speed agitation and dispersion by an impeller. In the case of high-viscosity products such as crack repair materials, the agitation speed is not high, so when nanocellulose is added in powder form, uniform dispersion is not possible and agglomeration occurs. The physical properties cannot be demonstrated. Therefore, water dispersion is required in a separate container, and in order to create a nano-structured state, it is desirable to secure the dispersed state of the nano structure using a nano disperser. If water dispersion is performed using a general disperser rather than a nano disperser, the aggregates are not sufficiently dispersed and have no effect on improving physical properties.

In addition, the nano cellulose may be included in a weight ratio of 3 to 7 parts by weight in the total content of the crack repair material composition, but if the nano cellulose is included in less than 3 parts by weight, the amount added is too small to affect the improvement of physical properties, 7 If it is contained in excess of parts by weight, the amount of paste in the nano-dispersed water-dispersed state becomes very high, resulting in a decrease in the overall solid content, which may cause a problem in which the crack-filling function of the crack repair material is not sufficiently exercised.

The rubber includes natural rubber, polyisoprene, polyisobutylene, butyl rubber, butadiene rubber, isoprene rubber, acrylonitrile butadiene rubber (NBR), urethane rubber, styrene/butadiene rubber (SBR), acrylic rubber, silicone rubber, etc. One type of synthetic rubber or a mixture of two or more types can be used.

For example, styrene/butadiene rubber (SBR) may be used as the rubber, which has excellent elasticity, excellent processability depending on chemical properties, and good miscibility with crack repair materials. .

The gypsum can exhibit rapid hardening and expansion properties and can maximize the adhesion strength and waterproofing performance of the coating film. The gypsum is a monoclinic mineral, and its chemical composition is CaSO ₄ ·2H ₂ O. , Forms plate-shaped or columnar crystals.

For example, any of the above gypsum can be used, such as anhydrous gypsum, dihydrate gypsum, and hemihydrate gypsum. Since dihydrate gypsum has a longer initial setting time than anhydrous gypsum and is advantageous in the summer, anhydrous gypsum is used in the winter and dihydrate in the summer. It is desirable.

The gypsum generates heat through a hydration reaction and can expand to enhance strength. The gypsum may be included in a weight ratio of 0.5 to 1.5 parts by weight based on the total content of the crack repair material composition.

If the gypsum is included in less than 0.5 parts by weight of the total content of the crack repair material composition, the degree of expansion is low, moisture evaporation time is long, drying progresses rapidly after setting and cracks may occur, and if the plaster is included in excess of 1.5 parts by weight, In this case, cracks may occur and strength may be reduced, or physical properties may be reduced due to a relative lack of content of other compositions.

The dispersant is included to ensure that the crack repair material composition is uniformly dispersed. Animal oil may be used as the dispersant. The dispersant may be included in a weight ratio of 0.1 to 1 part by weight based on the total content of the crack repair material composition.

If the dispersant is included in less than 0.1 parts by weight of the total content of the crack repair material composition, a problem may occur in which the dispersibility of the crack repair material composition is lowered, and if it is included in more than 0.5 parts by weight, the physical properties of the crack repair material manufactured are deteriorated. Problems may arise.

The dispersing agent may be animal fat prepared by the following method.

For example, in order to manufacture animal oil used as the dispersant, waste pig skin can first be prepared.

The pig skin may be pig skin that is discarded as an industrial by-product. Excluding moisture, the spent pig skin consists mostly of 47% crude protein and 53% crude fat.

Next, the spent pig blood can be washed.

Foreign substances or contaminants can be removed by washing the spent pig skin. For example, the washing is performed by washing the spent pig skin with a mixed solution of sodium bicarbonate (NaHCO ₃ ) solution and grapefruit seed extract at a weight ratio of 95:5. By washing, foreign substances or contaminants attached to the waste pig skin can be removed.

The sodium bicarbonate (NaHCO ₃ ) solution may be purified water in which sodium bicarbonate (NaHCO ₃ ) is dissolved and has a concentration range of 3 to 7 (w/w)%. The sodium bicarbonate is not toxic and has the ability to penetrate, diffuse, and It has a function such as expansion, and by washing the animal collagen-containing material using the sodium bicarbonate solution, the cell wall of the mold is expanded to sterilize the animal collagen-containing material and at the same time, foreign substances, etc. can be washed and removed.

In addition, the grapefruit seed extract (GSE) has antibacterial, antifungal, and antioxidant effects, and in toxicity tests, it was confirmed to be almost non-toxic compared to sodium benzoate and potassium sorbate. In particular, among the components of the grapefruit seed extract, ascorbic acid, ascorbyl palmitate, and tocopherol weaken the function of the cell walls and membranes of putrefactive and pathogenic microorganisms, inhibit enzyme activity, and prevent cell proliferation mechanisms originating from DNA/RNA, thereby preventing bacteria. , it has a sterilizing effect on yeast and mold, and has an inhibitory effect on the growth and toxin synthesis of mold.

Next, the washed spent pig skin can be mixed with pineapple extract to soften the washed spent pork skin.

By softening the washed waste pig skin by mixing it with pineapple extract, the washed waste pig skin can be easily enzymatically decomposed in a later process. For example, for 100 parts by weight of the total content of the washed waste pig skin, pineapple extract The washed spent pig skin can be softened by mixing 10 to 20 parts by weight and 50 to 70 parts by weight of purified water and then storing it at a temperature of 30 to 40°C for 5 to 10 hours.

The pineapple extract contains bromelain. Bromelain contained in the pineapple extract is a vegetable proteolytic enzyme extracted from the fruits and roots of pineapple (Ananas comosus), and other It is a mixture of various compounds with unidentified ingredients.

In addition, bromelain is a substance that decomposes muscle fibers well and is widely used in the treatment of anticancer, antiplatelet, respiratory inflammation, indigestion, rheumatoid arthritis, and mastitis. It is mainly used as an anti-inflammatory and anti-edema agent, and is known to be particularly effective in treating inflammation of soft tissue, traumatic events, and inflammation after tissue reaction after surgery. It is known that the treatment of inflammation occurs by bromelain improving the supply of nutrients to the inflamed area, such as decomposition of the fibrin layer in the inflamed area, anti-edema, eliminating pain and improving blood circulation, and strengthening immune function.

Extraction for producing the pineapple extract may be performed using known extraction methods such as solvent extraction, hot water extraction, or supercritical extraction. For example, the pineapple extract is prepared by mixing pineapple fruits and roots at a weight ratio of 1:1. It can be prepared by mixing purified water in a weight ratio of 1,800 to 2,200 parts by weight based on 100 parts by weight of the mixture, followed by heating at 90 to 95°C for 2 to 6 hours and performing hot water extraction.

Subsequently, an enzyme mixture can be prepared by mixing the softened waste pig skin with a proteolytic enzyme and a lipolytic enzyme.

The enzyme mixture can be prepared by mixing 10 to 20 parts by weight of proteolytic enzyme and 10 to 20 parts by weight of lipolytic enzyme with respect to 100 parts by weight of the total content of the softened waste pig skin. For example, the protein Alcalase may be used as the lipolytic enzyme, and lipase may be used as the lipolytic enzyme.

Specifically, the proteolytic enzyme and lipolytic enzyme can be used by purchasing commercially available products. Alcalase (Novozymes, Bagsvaerd, Denmark) is used as the proteolytic enzyme, and the lipolytic enzyme is used. Lipopan 50BG (Novozymes) may be used.

Next, an enzyme decomposition product can be prepared by enzymatically decomposing the enzyme mixture by heating it in a double boiler.

The enzyme hydrolyzate can be prepared by heating the enzyme mixture in a bath using a known bath. Specifically, the enzyme mixture can be prepared by heating the enzyme mixture in a bath at a temperature of 60 to 70°C for 5 to 15 hours. .

Next, the enzyme decomposition product can be heated to inactivate the enzyme and then centrifuged to separate it into a supernatant and a lower layer.

For example, the enzyme decomposition product can be heated at a temperature of 90 to 95° C. for 10 to 30 minutes to inactivate the enzyme, and then centrifuged using a known centrifuge to separate the enzyme into a supernatant and a lower layer.

Subsequently, animal fat can be produced by separating and purifying the supernatant.

The centrifuged lower layer may mainly contain a complex amino acid concentrate, and the supernatant may mainly contain an unsaturated fatty acid solution. The animal fat may be separated from only the pork skin fat component by separating and purifying only the supernatant. You can.

Since the configuration of producing animal oil by separating and purifying only the supernatant is a known technology, detailed description thereof will be omitted for convenience of explanation and clarity of the technical idea of the present invention.

The freeze stabilizer is used to provide anti-freeze properties, and the freeze stabilizer may be included in a weight ratio of 0.1 to 0.5 parts by weight based on the total content of the crack repair material composition.

Additionally, a mixture of potassium formate (PF) and calcium acetate may be used as the freeze stabilizer. For example, the freeze stabilizer may include 3 to 7 parts by weight of potassium formate (PF) and 1 to 5 parts by weight of calcium acetate. It can be prepared by mixing in weight ratio.

The potassium formate (PF) and calcium acetate have a very low freezing point and perform the function of promoting condensation at low temperatures, so they can be used as a freeze stabilizer. When mixed and used in a crack repair material composition, they provide the effect of lowering the freezing point and at the same time, strength. It can also play a role in promotion. In addition, the calcium acetate can enhance the anti-freezing effect by further strengthening the freezing point drop through competition with formate ions during dissolution.

Hereinafter, with reference to the attached drawings, an aqueous neutralization-resistant, high-elasticity crack repair composition with excellent low-temperature flexibility and tensile strength according to an embodiment of the technical idea of the present invention will be described in more detail by way of example.

<Example>

45 parts by weight of acrylic emulsion resin, 50 parts by weight of calcium carbonate, 3 parts by weight of titanium dioxide (TiO ₂ ), 2 parts by weight of fiber additive, 5 parts by weight of nanocellulose, 0.5 parts by weight of rubber, 1 part by weight of gypsum, dispersant A crack repair material was prepared by mixing 0.5 parts by weight and 0.3 parts by weight of the freeze stabilizer.

<Comparative example>

20 parts by weight of acrylic emulsion resin, 10 parts by weight of Portland cement, 5 parts by weight of fly ash, 30 parts by weight of calcium carbonate, 5 parts by weight of titanium dioxide (TiO ₂ ), 1 part by weight of rubber, 1.5 parts by weight of quicklime, mixture A crack repair material was prepared by mixing 5 parts by weight of water and 0.3 parts by weight of freeze stabilizer.

1. Physical property evaluation

The physical properties of the crack repair material according to the above example and the crack repair material according to the comparative example were measured, and the results are shown in [Table 1] below.

The elongation and tensile strength test methods were conducted according to the KS F 3211 test method.

division standard Example Comparative example Elongation at break % (room temperature) 100% or more 350 250 Low temperature elongation% (-20%) There will be an elongation rate 25% doesn't exist Tensile strength (N/mm ² ) 0.49 or higher 0.95 0.55 KS M 6010 3 types domestic type
(excluding ease of polishing) - pass pass

Referring to [Table 1] above, it can be confirmed that the crack repair material according to the example exhibits tensile strength and low-temperature elongation, and in additional physical property tests, it satisfies all the physical property standards for KS F 4936 concrete protective coating material and has a neutralization prevention function. I was able to confirm that it was doing so.

2. Appearance and compressive strength

After applying the crack repair materials according to the examples and comparative examples to the concrete structure, the appearance and compressive strength were tested, and the results are shown in [Table 2] below.

Test Items

unit
Test Methods Test result note Example Comparative example Appearance (4 weeks after application) - Visual judgment clear clear (20±2)℃, (65±20)% A.H. compressive strength
(4 weeks after application) MPa KS F 2405:2010 35.4 26.8

Referring to [Table 2], it can be seen that the compressive strength of the crack repair material according to the example is 35.4 MPa, which is superior to the compressive strength of 26.8 MPa of the crack repair material according to the comparative example.

For reference, the table below is a result table comparing the elongation rate of the present invention with that of other companies' products.

Above, a preferred embodiment of the present invention has been described with reference to the present invention, but those skilled in the art will understand that the present invention can be implemented in other specific forms without changing the technical idea or essential features. You will be able to understand it. Therefore, the embodiment described above should be understood in all respects as illustrative and not restrictive.

Claims (5)

Water-based neutralization-resistant high elasticity with excellent low-temperature flexibility and tensile strength, characterized by containing acrylic emulsion resin, calcium carbonate, titanium dioxide (TiO ₂ ), fiber additives, nanocellulose, rubber, gypsum, dispersant, and freeze stabilizer. In the crack repair composition,
40 to 50 parts by weight of acrylic emulsion resin, 40 to 60 parts by weight of calcium carbonate, 1 to 5 parts by weight of titanium dioxide (TiO ₂ ), 1 to 3 parts by weight of fiber additive, 3 to 7 parts by weight of nanocellulose, It contains 0.1 to 1 part by weight of rubber, 0.5 to 1.5 parts by weight of gypsum, 0.1 to 1 part by weight of dispersant, and 0.1 to 0.5 parts by weight of freeze stabilizer, and nanocellulose has a thickness of 3 to 50 nm, a length of 1 to 5 ㎛, and an oil absorption of 50. Nanocellulose with a microfibril structure of ~300m ² /g is used, the freeze stabilizer is prepared by mixing 3 to 7 parts by weight of potassium formate (PF) and 1 to 5 parts by weight of calcium acetate, and the fiber additive is Recycled fiber yarn is used, and the recycled fiber yarn collects toned bag fabric discarded as an industrial by-product after use, and mixes the collected toned bag fabric with sodium bicarbonate (NaHCO ₃ ) solution and grapefruit seed extract at a weight ratio of 95:5. Washing using the mixed solution, the washed tone bag fabric is immersed in an immersion solution at a temperature of 30 to 40 ℃ for 10 to 30 minutes, then separated, and steam at a temperature of 130 to 150 ℃ is applied to the separated tone bag fabric for 10 minutes. Softening by spraying for 30 minutes, wherein the immersion liquid contains 500 to 700 parts by weight of purified water, 10 to 50 parts by weight of ethanol, 1 to 3 parts by weight of hypochlorous acid (HOCl), and 0.1 to 1 part by weight of chlorine dioxide water. An aqueous neutralization-resistant high elasticity product with excellent low-temperature flexibility and tensile strength, which is manufactured by drying the softened tonback fabric at a temperature of 60 to 70°C for 2 to 8 hours and pulverizing the dried tonback fabric. Crack repair composition.
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