KR102165260B1 - Low elastic acrylic composition for waterproof and anti-corrosive construction of wastewater treatment concrete structure and waterproof and anti-corrosive construction method for wastewater treatment concrete structure using the same - Google Patents

Abstract

The present invention relates to a low elastic acrylic paint composition for waterproof and anti-corrosion of a water-treated concrete structure, and a waterproof and anti-corrosive construction method of a concrete structure using the same, wherein the low elastic acrylic paint composition contains, based on 100 parts by weight of a mixture composed of 30 to 50 wt% of methyl methacrylate, 10 to 30 wt% of at least one acrylate-based monomer selected from a group consisting of n-butyl methacrylate (n-BMA), iso-butyl methacrylate (iso-BMA), n-butyl acrylate (n-BAM), and a mixture thereof, and 20 to 40 wt% of an acrylic monomer, 1 to 10 parts by weight of allyl isothiocyanate; 0.1 t o5 parts by weight of a curing agent; and 1 to 10 parts by weight of a polymerization accelerator containing N,N-dimethylaniline, so that the low elastic acrylic paint composition is applied to the water-treated concrete structure to provide not only waterproof and anti-corrosive performance, but also excellent adhesion strength, abrasion resistance, heat resistance, acid resistance, chemical resistance, drug resistance, corrosion resistance, ozone resistance, and weather resistance.

Description

Low-elastic acrylic paint composition for waterproofing and anticorrosive of water-treated concrete structures, and waterproofing and anticorrosive construction method of concrete structures using the same.{LOW ELASTIC ACRYLIC COMPOSITION FOR WATERPROOF AND ANTI-CORROSIVE CONSTRUCTION OF WASTEWATER TREATMENT CONCRETE STRUCTURE AND WATERPROOF AND ANTI-CORROSIVE CONSTRUCTION METHOD WASTEWATER TREATMENT CONCRETE STRUCTURE USING THE SAME}

The present invention is applied to a water-treated concrete structure to impart not only waterproof and anticorrosive performance, but also excellent adhesion strength, abrasion resistance, heat resistance, acid resistance, chemical resistance, chemical resistance, corrosion resistance, ozone resistance, and weather resistance. It relates to a low-elastic acrylic paint composition and a waterproof/corrosive construction method for concrete structures using the same.

Chemical facilities such as reinforced concrete structures or chemical tanks in chemical factories, and water-treated concrete structures such as sewage pipes, water and sewage treatment plants, and wastewater treatment plants are in contact with acidic gas or direct acid wastewater, and the structure is deteriorating faster. In addition, not only facilities that can be confirmed externally, but also underground buried facilities and underwater structures are deteriorating. Various materials and methods have been developed and applied to repair deteriorated sections of structures exposed to such an acidic environment, but the durability against acidic environments is still insufficient. Moreover, since water-treated concrete structures in water treatment plants or drainage basins purify water with chlorine, ozone, etc., deterioration is accelerated by exposure to such water treatment materials.

Therefore, a waterproof anticorrosive material can be applied to the surface of such a water-treated concrete structure to improve water resistance and chemical resistance. Such waterproof anticorrosive materials include polyester resin, urea resin, bisphenol F resin, cresol noblock resin, and the like.

However, the conventional waterproof anticorrosive material has a problem in that the adhesion to the substrate is weak, and the durability is weak and toxic substances are discharged, such as cracking or peeling on the surface. In particular, in the case of chemical corrosion caused by acids, ozone, chemicals, or deterioration caused by freezing or melting in cast iron pipes, water treatment concrete structures and tanks, the quality of drinking water is degraded and ultimately the public It can act as a health threat.

Accordingly, it is excellent in abrasion resistance, heat resistance, acid resistance, chemical resistance, chemical resistance, corrosion resistance, ozone resistance, weather resistance, etc., it is possible to minimize the delamination from the attached base material, and it can be applied to various structures to improve the durability of the base material. There is a need for a corrosion-resistant coating material that is very economical to apply by minimizing the curing time.

Korean Patent Registration No. 10-1940995 Korean Patent Registration No. 10-2003753

The present invention was conceived to solve the above-described problems, and an embodiment of the present invention is applied to a water-treated concrete structure to provide not only waterproof and anticorrosive performance, but also excellent adhesion strength, abrasion resistance, heat resistance, acid resistance, chemical resistance, chemical resistance, It is intended to provide a low-elastic acrylic paint composition for waterproofing and anticorrosive of water-treated concrete structures that can impart corrosion resistance, ozone resistance, and weather resistance.

Another embodiment of the present invention is to provide a waterproofing and anticorrosive construction method of a concrete structure using a waterproof and anticorrosive low-elastic acrylic paint composition for a water-treated concrete structure according to the embodiment of the present invention.

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

One embodiment of the present invention is methyl methacrylate 30 to 50% by weight; At least one acrylate type selected from the group consisting of n-butyl methacrylate (n-BMA), iso-butyl methacrylate (iso-BMA), n-butyl acrylate (n-BAM), and mixtures thereof 10 to 30% by weight of monomer; And 100 parts by weight of a mixture comprising 20 to 40% by weight of an acrylic polymer; 1 to 10 parts by weight of allyl isothiocyanate; 0.1 to 5 parts by weight of a curing agent; And 1 to 10 parts by weight of a polymerization accelerator containing N,N-dimethylaniline.

The acrylic polymer is an alkyl (meth) acrylate 40 to 70% by weight; 5 to 20% by weight of cyclic (meth)acrylate; 1 to 15% by weight of an acid anhydride monomer represented by the following Formula 1; 1 to 15% by weight of hydrated oxide; And at least one imide-based compound selected from the group consisting of N-phenyl maleimide, N-methyl maleimide, N-ethyl maleimide, N-butyl maleimide, N-cyclohexyl maleimide, and mixtures thereof 0.5 to 10. It is possible to use those containing weight percent.

[Formula 1]

In the above formula, R ₁ and R ₂ are each independently a hydrogen atom or an alkyl group having 1 to 6 carbon atoms.

The hydrated oxide is Goethite; The Goethite is prepared by mixing a precursor material of iron oxide with an alcohol-based solvent, adding an aqueous sulfate solution to prepare a mixed solution, and then reacting the mixed solution at a temperature of 50 to 75°C and filtering and drying the mixture. Will; The concentration of iron oxide in the mixture is 0.5 to 1 M, and the concentration of sulfate ions is 1 to 3 M; The iron oxide precursor material is at least one selected from the group consisting of iron perchlorate (Fe(ClO ₄ ) ₃ , and iron phosphate (FePO ₄ ); the sulfate aqueous solution is lithium sulfate (Li ₂ SO ₄ ) and potassium sulfate ( K ₂ SO ₄ ) at least one selected from the group consisting of may be used.

The waterproof and anticorrosive low-elastic acrylic paint composition for the water-treated concrete structure further comprises 10 to 80 parts by weight of an inorganic filler based on 100 parts by weight of the mixture; The inorganic filler may be used to include 1 to 20 parts by weight of calcium metasilicate and 1 to 20 parts by weight of silk fibroin composite fibers including nephrite powder, based on 100 parts by weight of calcium carbonate.

Another embodiment of the present invention is a waterproofing and anticorrosive construction method of a concrete structure using a waterproof and anticorrosive low-elastic acrylic paint composition for a water-treated concrete structure according to the embodiment of the present invention. Chipping and cleaning the deteriorated area; Treating the cracks, grooves or deteriorated areas generated after the cleaning step by using a fast-setting putty material; Forming a primer layer on the base surface-treated area to enhance adhesion; Forming a low elastic acrylic waterproof/anticorrosive layer by applying a waterproof/anticorrosive low-elastic acrylic paint composition for the water-treated concrete structure on the primer layer; Forming a low-elastic acrylic-based surface finish layer by applying a low-elastic acrylic-based surface finish material on the upper portion of the low-elastic acrylic-based waterproof/corrosive layer; And it provides a waterproofing and anticorrosive construction method of a concrete structure including the step of curing.

The low-elastic acrylic paint composition for waterproofing and anticorrosive of a water-treated concrete structure according to an embodiment of the present invention is applied to a water-treated concrete structure to provide not only waterproof and anticorrosive performance, but also excellent adhesion strength, abrasion resistance, heat resistance, acid resistance, chemical resistance, and chemical resistance. , It has the effect of imparting corrosion resistance, ozone resistance, and weather resistance. Accordingly, according to the waterproofing and anticorrosive construction method of concrete structures using the waterproofing and anticorrosive low-elastic acrylic paint composition of the water-treated concrete structure, there is an effect of realizing an increase in the common period of the water-treated concrete structure, reduction of maintenance cost, and improvement of workability. have.

In addition, the low-elastic acrylic paint composition for waterproofing and anticorrosive of the water-treated concrete structure has a fast setting, and has an eco-friendly effect that can replace conventional polyester-based resin, urea-based resin, bisphenol F-based resin, and cresol noblock-based resin. have. Accordingly, according to the waterproofing and anticorrosive construction method of the concrete structure using the waterproofing and anticorrosive low-elastic acrylic paint composition of the water-treated concrete structure, the construction period can be shortened and the hygiene and stability of the water-treated drinking water can be secured. There is.

1 is a schematic flowchart of a preferred manufacturing example of a low-elastic acrylic paint composition for waterproofing and anticorrosive of a water-treated concrete structure according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail. However, this is presented as an example, and the present invention is not limited thereby, and the present invention is only defined by the scope of the claims to be described later.

One embodiment of the present invention is methyl methacrylate 30 to 50% by weight; At least one acrylate type selected from the group consisting of n-butyl methacrylate (n-BMA), iso-butyl methacrylate (iso-BMA), n-butyl acrylate (n-BAM), and mixtures thereof 10 to 30% by weight of monomer; And 100 parts by weight of a mixture comprising 20 to 40% by weight of an acrylic polymer; 1 to 10 parts by weight of allyl isothiocyanate; 0.1 to 5 parts by weight of a curing agent; And 1 to 10 parts by weight of a polymerization accelerator containing N,N-dimethylaniline. It provides a low-elastic acrylic paint composition for waterproofing and anticorrosive of water-treated concrete structures.

The low-elastic acrylic paint composition for waterproofing and anticorrosive of a water-treated concrete structure according to an embodiment of the present invention is applied to a water-treated concrete structure to provide not only waterproof and anticorrosive performance, but also excellent adhesion strength, abrasion resistance, heat resistance, acid resistance, chemical resistance, and chemical resistance. , It has the effect of imparting corrosion resistance, ozone resistance, and weather resistance. Accordingly, according to the waterproofing and anticorrosive construction method of concrete structures using the waterproofing and anticorrosive low-elastic acrylic paint composition of the water-treated concrete structure, there is an effect of realizing an increase in the common period of the water-treated concrete structure, reduction of maintenance cost, and improvement of workability. have.

In addition, the low-elastic acrylic paint composition for waterproofing and anticorrosive of the water-treated concrete structure has a fast setting, and has an eco-friendly effect that can replace conventional polyester-based resin, urea-based resin, bisphenol F-based resin, and cresol noblock-based resin. have. Accordingly, according to the waterproofing and anticorrosive construction method of the concrete structure using the waterproofing and anticorrosive low-elastic acrylic paint composition of the water-treated concrete structure, the construction period can be shortened and the hygiene and stability of the water-treated drinking water can be secured. There is.

The mixture of methyl methacrylate, acrylate-based monomer, and acrylic polymer is applied to a water-treated concrete structure to provide waterproof and anti-corrosive properties, as well as excellent adhesion strength, abrasion resistance, heat resistance, acid resistance, chemical resistance, chemical resistance, corrosion resistance, and ozone resistance. , It functions to provide weather resistance.

More specifically, the methyl methacrylate functions to improve watertightness of the coating film, and to improve hardness and abrasion properties. The methyl methacrylate may be contained in the range of 30 to 50% by weight based on the total weight of the mixture. When the content of the methyl methacrylate is too low, the above-described improvement effect may be insufficient, and when the content of the methyl methacrylate is too high, the coating film strength is high, but cracks may occur.

In addition, the acrylate-based monomer functions to prevent cracking by improving elongation and flexural strength. These acrylate monomers are selected from the group consisting of n-butyl methacrylate (n-BMA), iso-butyl methacrylate (iso-BMA), n-butyl acrylate (n-BAM), and mixtures thereof. One or more of these can be preferably used. The acrylate-based monomer may be contained in the range of 10 to 30% by weight based on the total weight of the mixture. When the content of the acrylate-based monomer is too low, there is a problem that the above-described improvement effect may be insufficient, and when the content of the acrylate-based monomer is too large, the strength may be lowered and durability may decrease, and the coating film is sticky. There is a problem that contamination may occur due to (Tacky).

In addition, the acrylic polymer functions to further improve the effects of heat resistance, acid resistance, chemical resistance, chemical resistance, corrosion resistance, ozone resistance, and weather resistance. The acrylic polymer may be contained in the range of 20 to 40% by weight based on the total weight of the mixture. When the content of the acrylic polymer is too low, there is a problem that the above-described improvement effect may be insufficient, and when the content of the acrylic polymer is too large, there is a problem that the surface hardness is lowered and durability may be reduced.

Herein, the "acrylic polymer" is a polymer formed by polymerization of an acrylate-based monomer or a methacrylate-based monomer, and is polymerized solely by an acrylate-based monomer or a methacrylate-based monomer, or bulk polymerization, suspension polymerization, solution with other comonomers It means a resin produced by copolymerization by polymerization or the like.

In particular, the acrylic polymer is an alkyl (meth) acrylate 40 to 70% by weight; 5 to 20% by weight of cyclic (meth)acrylate; 1 to 15% by weight of an acid anhydride monomer represented by the following Formula 1; 1 to 15% by weight of hydrated oxide; And at least one imide-based compound selected from the group consisting of N-phenyl maleimide, N-methyl maleimide, N-ethyl maleimide, N-butyl maleimide, N-cyclohexyl maleimide, and mixtures thereof 0.5 to 10. It is possible to use those containing weight percent. Thus, there is an effect of further improving the effects of heat resistance, acid resistance, chemical resistance, chemical resistance, corrosion resistance, ozone resistance, and weather resistance.

[Formula 1]

In the above formula, R ₁ and R ₂ are each independently a hydrogen atom or an alkyl group having 1 to 6 carbon atoms.

The "(meth)acrylate" means collectively referring to acrylate and methacrylate. In addition, it is more preferable that the alkyl group of the alkyl (meth)acrylate has 1 to 5 carbon atoms. Specific examples of the alkyl (meth) acrylate include methyl acrylate, ethyl acrylate, methyl methacrylate, ethyl methacrylate, methyl ethacrylate, ethyl ethacrylate, propyl acrylate, isopropyl acrylate, Butyl acrylate, propyl methacrylate, isopropyl methacrylate, butyl methacrylate, isobutyl methacrylate, and the like, but are not limited thereto.

In addition, the cyclic (meth)acrylate is a cycloalkyl group having 6 to 12 carbon atoms, an aryl group having 6 to 12 carbon atoms, and an aryl group or aryloxy having 6 to 12 carbon atoms unsubstituted or substituted with an alkyl group having 1 to 5 carbon atoms. It is preferable that it is a (meth)acrylate substituted with a group selected from the group consisting of an alkyl group having 1 to 3 carbon atoms substituted with a group. Specific examples of the cyclic (meth)acrylate include cyclohexyl methacrylate, benzyl methacrylate, cyclohexyl acrylate, 2-phenoxyethyl acrylate, 3,3,5-trimethylcyclohexyl methacrylate, phenyl Methacrylate, naphthyl methacrylate, and the like, but are not limited thereto.

In addition, as the hydrated oxide, Goethite may be preferably used. As a result, there is an effect of further improving the effects of heat resistance, acid resistance, chemical resistance, chemical resistance, corrosion resistance, ozone resistance, and weather resistance.

More specifically, the Goethite was mixed with a precursor material of iron oxide and an alcohol-based solvent, and then an aqueous sulfate solution was added to prepare a mixture, and then the mixture was reacted at a temperature of 50 to 75°C, and then filtered and dried. What is produced by making it can be preferably used.

In this case, the concentration of iron oxide in the mixed solution is 0.5 to 1 M, and the concentration of sulfate ion is 1 to 3 M; The iron oxide precursor material is at least one selected from the group consisting of iron perchlorate (Fe(ClO ₄ ) ₃ , and iron phosphate (FePO ₄ ); the sulfate aqueous solution is lithium sulfate (Li ₂ SO ₄ ) and potassium sulfate ( K ₂ SO ₄ ) at least one selected from the group consisting of may be used.

In addition, at least one imide-based compound selected from the group consisting of the N-phenyl maleimide, N-methyl maleimide, N-ethyl maleimide, N-butyl maleimide, N-cyclohexyl maleimide, and mixtures thereof By mixing in the above amount, there is an effect that can greatly improve the effects of excellent heat resistance, ozone resistance, and weather resistance. At this time, the imide-based compound is N-phenyl maleimide; N-cyclohexyl maleimide; By using a mixture of N-butyl maleimide in a weight ratio of 1: 1: 3, the above effect can be further improved.

On the other hand, the allyl isothiocyanate further improves waterproof and anticorrosive performance, further improves the curing speed, and prevents oxidation of the coating film. The allyl isothiocyanate may be included in an amount of 1 to 10 parts by weight based on 100 parts by weight of the mixture. When the content of allyl isothiocyanate is too small, the above-described improvement effect may be insignificant, and when the content of allyl isothiocyanate is too large, the pot life is short and workability may be reduced. There is this.

In addition, the curing agent functions to improve the curing speed. The curing agent is benzoyl peroxide, dibenzol peroxide, dioctyl phthalate, dicyclohexyl phthalate, dipropylene glycol dibenzoate, and these One or more selected from the group consisting of a mixture of may be preferably used. In this case, the curing agent may be included in an amount of 0.1 to 5 parts by weight based on 100 parts by weight of the mixture. When the content of the curing agent is too small, there is a problem that an uncuring problem may occur, and when the content of the curing agent is too large, there is a problem in that workability may be deteriorated due to a short pot life.

In addition, the polymerization accelerator containing N,N-dimethylaniline functions to further accelerate the curing rate together with the curing agent. In particular, even at low temperatures, a fast curing speed can be achieved by controlling the content of the polymerization accelerator. The N,N-dimethylaniline may be contained in an amount of 50 to 95% by weight based on the total weight of the polymerization accelerator, and the N,N-dimethylaniline is N-ethyl-N-hydroxyethylaniline, N,N- Selected from the group consisting of di(2-hyidoxy propyl)-p-toluidine, N,N-dimethyl-p-toluidine, tri-n-butyl amine, N,N-dimethyl-p-toluidine and mixtures thereof The above-described effects can be further improved by mixing and using one or more of 5 to 50% by weight.

The polymerization accelerator including the N,N-dimethylaniline may be included in an amount of 1 to 10 parts by weight based on 100 parts by weight of the mixture. When the content of the polymerization accelerator is too small, there is a problem that the curing speed may be too delayed, and when the content of the polymerization accelerator is too large, there is a problem in that workability may be deteriorated due to short pot life.

A preferred example of preparing a low-elastic acrylic-based coating composition for waterproofing the water-treated concrete structure according to an embodiment of the present invention is illustrated in FIG. 1.

First, the above alkyl (meth)acrylate; Cyclic (meth)acrylate; An acid anhydride-based monomer represented by Formula 1; Hydrated oxide; And at least one imide-based compound selected from the group consisting of N-phenyl maleimide, N-methyl maleimide, N-ethyl maleimide, N-butyl maleimide, N-cyclohexyl maleimide, and mixtures thereof. Mixing and polymerizing in a content range to prepare an acrylic polymer;

Then, methyl methacrylate; At least one acrylate type selected from the group consisting of n-butyl methacrylate (n-BMA), iso-butyl methacrylate (iso-BMA), n-butyl acrylate (n-BAM), and mixtures thereof Monomer; And preparing a mixture by mixing the prepared acrylic polymer in the above content range. And

Allyl isothiocyanate to the mixture; Hardener; And mixing a polymerization accelerator containing N,N-dimethylaniline to prepare a low-elastic acrylic coating composition for waterproofing and anticorrosive of water-treated concrete structures.

In addition, the waterproof and anticorrosive low-elastic acrylic paint composition for the water-treated concrete structure may further include 0.5 to 10 parts by weight of sodium silicate-10 hydrate (Na ₂ SiO ₃ -10H ₂ 0) based on 100 parts by weight of the above mixture. have. Thereby, there is an effect of being able to further improve the effects of heat resistance, acid resistance, chemical resistance, chemical resistance, corrosion resistance, and weather resistance of the coating film itself, while greatly improving the adhesion to concrete spheres.

Meanwhile, the waterproof/corrosive low-elastic acrylic paint composition for the water-treated concrete structure may further include 10 to 80 parts by weight of an inorganic filler based on 100 parts by weight of the mixture. These inorganic fillers may preferably contain 1 to 20 parts by weight of calcium metasilicate and 1 to 20 parts by weight of silk fibroin composite fibers including nephrite powder, based on 100 parts by weight of calcium carbonate.

More specifically, the calcium carbonate has an effect of further improving the strength of the coating film and further improving the effects of wear resistance and heat resistance.

In addition, the calcium metasilicate may more preferably be used in which CaO/SiO ₂ has a molar ratio of 0.9 to 1.1. As a result, the strength of the coating film can be further improved, the bonding strength with the concrete sphere can be greatly improved, and the effects of wear resistance, heat resistance, acid resistance, chemical resistance, chemical resistance, corrosion resistance, and weather resistance can be further improved. have.

More specifically, the calcium metasilicate is prepared by mixing calcium oxide and fumed silica, and then dehydrating and firing at a temperature of 900 to 1100 °C, so that CaO/SiO ₂ has a molar ratio of 0.9 to 1.1, as described above. The effect can be further improved.

In addition, the silk fibroin composite fiber containing the nephrite powder has excellent dispersibility in the low-elastic acrylic coating composition for waterproofing and anticorrosive of water-treated concrete structures of the present invention, further improving the strength of the coating film, and improving the effects of abrasion resistance and heat resistance. There is an effect that can be further improved.

The silk fibroin composite fiber including the nephrite powder is prepared by dissolving silk fibroin in an organic solvent, and then mixing 1 to 30 parts by weight of nephrite powder with respect to 100 parts by weight of the silk fibroin to prepare an electrospinning solution; And electrospinning the prepared electrospinning solution to produce a silk fibroin composite fiber including nephrotic powder.

More specifically, the silk fibroin composite fiber containing the nephrite powder dissolves silk fibroin in formic acid as a solvent to a concentration of 20 to 50% by weight, and then mixes 1 to 30 parts by weight of nephrite powder with respect to 100 parts by weight of the silk fibroin To prepare an electrospinning solution; And by electrospinning the prepared electrospinning solution, it is possible to prepare a silk fibroin composite fiber comprising nephrite powder having an average length of 300 to 700 nm.

Another embodiment of the present invention is a waterproofing and anticorrosive construction method of a concrete structure using a waterproof and anticorrosive low-elastic acrylic paint composition for a water-treated concrete structure according to the embodiment of the present invention. Chipping and cleaning the deteriorated area; Treating the cracks, grooves or deteriorated areas generated after the cleaning step by using a fast-setting putty material; Forming a primer layer on the base surface-treated area to enhance adhesion; Forming a low elastic acrylic waterproof/anticorrosive layer by applying a waterproof/anticorrosive low-elastic acrylic paint composition for the water-treated concrete structure on the primer layer; Forming a low-elastic acrylic-based surface finish layer by applying a low-elastic acrylic-based surface finish material on the upper portion of the low-elastic acrylic-based waterproof/corrosive layer; And it provides a waterproofing and anticorrosive construction method of a concrete structure including the step of curing.

In this case, the primer layer has a thickness of 10 to 100 μm; The low elastic acrylic waterproof anticorrosive layer has a thickness of 200 to 300 μm; The low elasticity acrylic surface finish layer may have a thickness of 200 to 300 μm.

Here, the fast-setting putty material may be one or more selected from the group consisting of an epoxy putty, a urethane putty, an ultra-fast cement-based putty, and a mixture thereof.

In addition, the primer that can be used for the formation of the primer layer may be a conventional primer generally known in the art, and the type is not particularly limited. However, as a non-limiting example, one or more selected from the group consisting of solvent-free epoxy, styrene-butadiene emulsion, acrylic emulsion, silicate-based permeable waterproofing agent, silica sol, and mixtures thereof may be used.

At this time, when using a mixture of 10 to 100 parts by weight of a waterproof/anti-corrosive low-elastic acrylic paint composition for a water-treated concrete structure according to an embodiment of the present invention, based on 100 parts by weight of the conventional primer, It is possible to further improve adhesion to the low-elastic acrylic waterproof/corrosive layer, as well as to further improve the effect of the present invention.

In addition, the surface finish that can be used for the formation of the low-elastic acrylic-based surface finish layer may be a conventional surface finish generally known in the art, and the type is not particularly limited. However, as a non-limiting example, at least one selected from the group consisting of a solvent-free epoxy, an acrylic-urethane copolymer, an inorganic silica surface protectant, a silane-based penetration enhancer, and a mixture thereof may be used.

At this time, when using a mixture of 10 to 100 parts by weight of a waterproof and anticorrosive low-elastic acrylic paint composition for a water-treated concrete structure according to an embodiment of the present invention, based on 100 parts by weight of the above-described conventional surface finish, the aforementioned low-elasticity Not only can the adhesion to the acrylic waterproof/corrosive layer be further improved, but also the effect of the present invention can be further improved.

The low-elastic acrylic paint composition for waterproofing and anticorrosive of a water-treated concrete structure according to an embodiment of the present invention is applied to a water-treated concrete structure to provide not only waterproof and anticorrosive performance, but also excellent adhesion strength, abrasion resistance, heat resistance, acid resistance, chemical resistance, and chemical resistance. , It has the effect of imparting corrosion resistance, ozone resistance, and weather resistance. Accordingly, according to the waterproofing and anticorrosive construction method of concrete structures using the waterproofing and anticorrosive low-elastic acrylic paint composition of the water-treated concrete structure, there is an effect of realizing an increase in the common period of the water-treated concrete structure, reduction of maintenance cost, and improvement of workability. have.

In addition, the low-elastic acrylic paint composition for waterproofing and anticorrosive of the water-treated concrete structure has a fast setting, and has an eco-friendly effect that can replace conventional polyester-based resin, urea-based resin, bisphenol F-based resin, and cresol noblock-based resin. have. Accordingly, according to the waterproofing and anticorrosive construction method of the concrete structure using the waterproofing and anticorrosive low-elastic acrylic paint composition of the water-treated concrete structure, the construction period can be shortened and the hygiene and stability of the water-treated drinking water can be secured. There is.

Above, the preferred embodiment of the present invention has been described in detail, but the present invention is not limited to the above embodiment, and various modifications by those of ordinary skill in the relevant field within the scope of the technical idea of the present invention This is possible.

<Example 1>

First, as an acrylic polymer, methyl methacrylate 58% by weight; 12% by weight of cyclohexyl methacrylate; 11% by weight of an acid anhydride monomer represented by the following formula (2); Goethite 13% by weight; And N-phenyl maleimide; N-cyclohexyl maleimide; 6% by weight of an imide-based compound mixed with N-butyl maleimide in a weight ratio of 1: 1: 3 was mixed and polymerized.

[Formula 2]

At this time, the Goethite is mixed with a precursor material of iron oxide (iron phosphate (FePO ₄ )) and an isopropyl alcohol solvent, and then potassium sulfate (K ₂ SO ₄ ) aqueous solution is added to prepare a mixed solution, and the The mixture obtained by reacting the mixture at a temperature of 50 to 75°C was filtered and dried. In this case, the concentration of iron oxide in the mixture was 0.9 M, and the concentration of sulfate ion was 1.7 M.

Then, 42% by weight of methyl methacrylate; 20% by weight of n-butyl methacrylate (n-BMA); And 38% by weight of the prepared acrylic polymer were mixed to prepare a mixture.

Then, based on 100 parts by weight of the mixture; 2 parts by weight of allyl isothiocyanate; 2.5 parts by weight of a benzoyl peroxide curing agent; 5 parts by weight of a polymerization accelerator in which N,N-dimethylaniline and N,N-di(2-hyidoxypropyl)-p-toluidine are mixed in a 95:5 weight ratio; And 75 parts by weight of an inorganic filler (calcium carbonate) to prepare a low-elastic acrylic paint composition for waterproofing and anticorrosive of water-treated concrete structures.

<Example 2>

Before adding the allyl isothiocyanate, the curing agent and the polymerization accelerator, 4.9 parts by weight of sodium silicate-10 hydrate (Na ₂ SiO ₃ -10H ₂ 0) was further mixed with respect to 100 parts by weight of the mixture to prepare a mixture. Except for, by performing the same method as in Example 1, a waterproof and anticorrosive low-elastic acrylic paint composition for water-treated concrete structures was prepared.

<Example 3>

By performing the same method as in Example 1, except that the inorganic filler, based on 100 parts by weight of calcium carbonate, contains 15 parts by weight of calcium metasilicate and 15 parts by weight of silk fibroin composite fibers including nephrite powder. , A low-elastic acrylic paint composition for waterproofing and anticorrosive of water-treated concrete structures was prepared.

At this time, the calcium metasilicate was prepared by mixing calcium oxide and fumed silica and then dehydrating and firing at a temperature of about 1000° C. to have CaO/SiO ₂ in a molar ratio of 0.9 to 1.1.

In addition, after dissolving silk fibroin to a concentration of 25% by weight in formic acid as a solvent, the silk fibroin composite fiber containing the nephrite powder was mixed with 7 parts by weight of nephrotic powder based on 100 parts by weight of the silk fibroin to prepare an electrospinning solution. To manufacture; By electrospinning the prepared electrospinning solution, what was prepared so that the average length was about 590 nm was used.

<Comparative Example 1>

First, as an acrylic polymer, methyl methacrylate 55% by weight; 28% by weight of ethyl acrylate; 17% by weight of the acid anhydride-based monomer represented by Chemical Formula 2 was mixed and polymerized.

Then, 42% by weight of methyl methacrylate; 20% by weight of 2-hydroxyethyl methacrylate; And 38% by weight of the prepared acrylic polymer were mixed to prepare a mixture.

Then, based on 100 parts by weight of the mixture; 2.5 parts by weight of a benzoyl peroxide curing agent; 2 parts by weight of N,N-di(2-hyidoxypropyl)-p-toluidine; And 75 parts by weight of an inorganic filler (calcium carbonate) were mixed to prepare a coating composition for comparison.

<Comparative Example 2>

First, as an acrylic polymer, methyl methacrylate 59% by weight; 28% by weight of n-butyl methacrylate; A coating composition for comparison was prepared by performing the same method as in Comparative Example 1, except that 13% by weight of the acid anhydride-based monomer represented by Formula 2 was mixed and polymerized.

<Comparative Example 3>

First, as an acrylic polymer, methyl methacrylate 55% by weight; 28% by weight of n-butyl methacrylate; A coating composition for comparison was prepared by performing the same method as in Comparative Example 1, except that 17% by weight of the acid anhydride-based monomer represented by Formula 2 was mixed and polymerized.

Then, methyl methacrylate 32% by weight; 35% by weight of 2-phenylethyl methacrylate; And 33% by weight of the acrylic polymer prepared above to prepare a mixture.

Then, based on 100 parts by weight of the mixture; 4 parts by weight of a benzoyl peroxide curing agent; 3 parts by weight of N,N-di(2-hydoxypropyl)-p-toluidine; And 75 parts by weight of an inorganic filler (calcium carbonate) were mixed to prepare a coating composition for comparison.

<Test Example 1> Evaluation of basic physical properties

For the coating compositions according to the above-prepared Examples and Comparative Examples, compressive strength, adhesion strength, and water absorption were evaluated according to KS F 4916:2016; Tensile strength and elongation at tensile failure were evaluated according to KS F 4923:2005. The results are shown in Table 1 below.

division Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Comparative Example 3 Compressive strength (MPa) 99.7 101.3 104.5 96.1 95.9 97.2 Bond strength (MPa) 2.8 2.8 2.9 2.1 2.3 2.5 Water absorption (%) 0.10 0.09 0.05 1.8 1.6 1.5 Tensile strength (N/mm ² ) 10.1 10.4 10.6 8.3 8.7 9.2 In case of tensile failure
Elongation(%) 1.3 1.4 1.6 0.2 0.7 0.8

As can be seen in Table 1, the waterproof and anticorrosive low-elastic acrylic coating composition for water-treated concrete structures according to Examples 1 to 3 of the present invention is superior to the comparative coating composition according to Comparative Examples 1 to 3, It was confirmed that it had compressive strength, adhesion strength, and tensile strength. As a result, it is expected to exhibit excellent film strength.

In addition, it was confirmed that the waterproof and anticorrosive low-elastic acrylic paint composition for water-treated concrete structures according to Examples 1 to 3 of the present invention has a high elongation compared to the comparative paint composition according to Comparative Examples 1 to 3. As a result, it is expected to exhibit excellent crack resistance.

In addition, it was confirmed that the waterproof and anticorrosive low-elastic acrylic paint composition for water-treated concrete structures according to Examples 1 to 3 of the present invention has a low water absorption compared to the comparative paint composition according to Comparative Examples 1 to 3. As a result, it is expected to exhibit excellent waterproofness.

<Test Example 2> Chemical resistance evaluation

A test body for evaluation of chemical resistance was prepared by pouring and curing the coating compositions according to the above-prepared examples and comparative examples, respectively, into a circular frame having a size of (diameter) 40 mm x (thickness) 160 mm. According to ASTM C 267-01 (2012), each of the prepared test specimens for chemical resistance evaluation was 30% nitric acid (HNO ₃ ), 30% sodium hydroxide (NaOH), 30% sulfuric acid (H ₂ SO ₄ ) and 30%. The mass before and after immersion in the hydrofluoric acid (HF) solution for 168 hours was measured, and the resulting mass reduction rate and appearance change were evaluated, and the results are shown in Table 2 below.

division Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Comparative Example 3 HNO ₃ Initial (g) 18.263 19.02 18.221 18.574 18.952 18.752 168h politics (g) 18.208 18.952 18.104 16.876 17.028 16.926 Reduction rate (%) 0.3% 0.36% 0.64% 9.14% 10.15% 9.7% Appearance change No change No change No change Slight corrosion Slight corrosion No change NaOH Initial (g) 18.463 18.295 18.26 17.002 18.482 18.68 168h politics (g) 18.453 18.206 18.062 15.104 15.47 17.982 Reduction rate (%) 0.05% 0.48% 1.08% 11.16% 16.3% 3.74% Appearance change No change No change No change Slight corrosion Slight corrosion No change H ₂ SO ₄ Initial (g) 18.227 19.008 18.018 18.42 18.752 19.258 168h politics (g) 18.235 19.102 18.107 16.253 16.024 16.94 Reduction rate (%) -0.04% -0.49% 0.0% 11.76% 14.5% 12% Appearance change No change No change No change No change No change Slight corrosion HF Initial (g) 18.328 19.019 18.269 18.348 18.647 18.491 168h politics (g) 18.312 18.932 18.187 17.166 15.713 17.419 Reduction rate (%) 0.005% 0.4% 0.4% 6.4% 15.7% 5.8% Appearance change No change No change No change Slight corrosion Slight corrosion No change

As can be seen in Table 2, the waterproof and anti-corrosive low-elastic acrylic paint composition for water-treated concrete structures according to Examples 1 to 3 of the present invention is compared with the comparative paint composition according to Comparative Examples 1 to 3, 30 % Nitric acid (HNO ₃ ), 30% sodium hydroxide (NaOH), 30% sulfuric acid (H ₂ SO ₄ ), and 30% hydrofluoric acid (HF) solutions have a low mass reduction rate, and the appearance is well maintained in a clean state. there was. As a result, it is expected to exhibit excellent chemical resistance.

<Test Example 3> Heat resistance evaluation

A test body for evaluating heat resistance was prepared by pouring and curing the coating compositions according to the above-prepared Examples and Comparative Examples, respectively, into a circular frame having a size of (diameter) 40 mm x (thickness) 160 mm. Each of the prepared test specimens for heat resistance evaluation was placed in an oven at 95° C. to measure the mass before and after standing for 24 hours, and the mass reduction rate and appearance change accordingly were evaluated, and the results are shown in Table 3 below.

division Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Comparative Example 3 Initial (g) 19.070 20.24 18.48 19.862 18.765 18.964 24h stationary (g) 18.931 20.012 18.72 18.52 18.021 18.523 Reduction rate (%) 0.7% 1.1% -1.3% 6.75% 3.9% 2.3% Appearance change No change No change No change Uplifting Surface crack No change

As can be seen in Table 3, the waterproof and anti-corrosive low-elastic acrylic paint composition for water-treated concrete structures according to Examples 1 to 3 of the present invention was compared to the comparative paint composition according to Comparative Examples 1 to 3, It was confirmed that the reduction rate was low and the exterior was well maintained in a clean state. Accordingly, it is expected to be able to exhibit excellent heat resistance.

<Test Example 4> Ozone resistance evaluation

A test body for evaluating ozone resistance was prepared by pouring and curing the coating compositions according to the above-prepared Examples and Comparative Examples in a circular frame having a size of (diameter) 40 mm×(thickness) 160 mm. Each of the prepared test specimens for ozone resistance evaluation was put in an ozone treatment tank of an ozone deterioration tester having a dissolved ozone concentration of 5±0.5 ppm and a water temperature of 10±2° C. and allowed to stand for 200 hours to perform performance evaluation, and the results are shown in Table 4 below. Shown in.

Performance evaluation items Appearance ^(a) Surface microscopic observation
(SEM) ^(b) Color difference ^(c) Adhesion strength test
(N/㎜ ² ) ^(d) Permeability test
(Permeable amount g) ^(e) Dissolution test ^(f)
Amount of residual chlorine (mg/L) Test standard KS F 4921 - - KS F 4921 KS F 4921 KS F 4921 Example 1 No change No change -0.08 2.0 0.00 0.1 Example 2 No change No change -0.04 1.8 0.00 0.1 Example 3 No change No change -0.03 2.0 0.00 0.1 Comparative Example 1 Some cracks Microcracks -0.10 0.4 0.01 0.3 Comparative Example 2 Some cracks Some cracks -0.16 1.2 0.02 0.28 Comparative Example 3 No change Local clumping -0.17 1.6 0.02 0.4 Test conditions/standards:
^(a) Visual observation after ozone treatment
^(b) Field emission scanning electron microscope, ×1000
^(c) After ozone treatment, the brightness index ΔL measured with a color difference meter (+ value means brighter,-value means darker)
^(d) Measurement of adhesion strength after immersion in water at 20±1℃ for 24 hours
^(e) Hold for 1 hour at a water pressure of 0.1 N/mm ^2
(f) Amount of residual chlorine/ less than 0.7 mg/L

As can be seen from Table 4, the waterproof and anticorrosive low-elastic acrylic paint composition for water-treated concrete structures according to Examples 1 to 3 of the present invention is compared with the comparative paint composition according to Comparative Examples 1 to 3, As a result of evaluation of shape, surface microscopic observation, and color difference change, it was confirmed that there was no microcracks and almost no color change due to low color difference change, and excellent appearance was well maintained.

In addition, the waterproof and anticorrosive low-elastic acrylic paint composition for water-treated concrete structures according to Examples 1 to 3 of the present invention has excellent adhesion strength, low water permeability, and residual chlorine amount compared to the comparative paint composition according to Comparative Examples 1 to 3 Having a bar, it was confirmed that excellent coating properties and water resistance were well maintained.

This is expected to exhibit excellent ozone resistance.

<Test Example 5> Eco-friendly evaluation

For the waterproof and anticorrosive low-elastic acrylic paint composition for the water-treated concrete structure according to Example 3 prepared above, in order to evaluate eco-friendliness, a process test of hygiene and safety standards for water supply materials and products was performed, and the results are shown in the following table. It is shown in 5.

As can be seen in Table 5 above, it was confirmed that the waterproof and anticorrosive low-elastic acrylic paint composition for water-treated concrete structures according to Example 3 of the present invention satisfies the hygiene and safety standards of materials and products for water supply. It is expected to be able to show sex.

As described above, those skilled in the art to which the present invention pertains will understand that the present invention can be implemented in other specific forms without changing the technical spirit or essential features. Therefore, all the embodiments described above are illustrative and should be understood as non-limiting. The scope of the present invention should be construed as including all altered or modified forms derived from the meaning and scope of the claims to be described later rather than the above detailed description, and equivalent concepts thereof.

Claims (5)

30 to 50% by weight of methyl methacrylate; At least one acrylate type selected from the group consisting of n-butyl methacrylate (n-BMA), iso-butyl methacrylate (iso-BMA), n-butyl acrylate (n-BAM), and mixtures thereof 10 to 30% by weight of monomer; And 100 parts by weight of a mixture comprising 20 to 40% by weight of an acrylic polymer;
1 to 10 parts by weight of allyl isothiocyanate;
0.1 to 5 parts by weight of a curing agent; And
A low-elastic acrylic paint composition for waterproofing and anticorrosive of water-treated concrete structures, comprising 1 to 10 parts by weight of a polymerization accelerator containing N,N-dimethylaniline.
The method of claim 1,
The acrylic polymer is
40 to 70% by weight of alkyl (meth)acrylate; 5 to 20% by weight of cyclic (meth)acrylate; 1 to 15% by weight of an acid anhydride monomer represented by the following Formula 1; 1 to 15% by weight of hydrated oxide; And at least one imide-based compound selected from the group consisting of N-phenyl maleimide, N-methyl maleimide, N-ethyl maleimide, N-butyl maleimide, N-cyclohexyl maleimide, and mixtures thereof 0.5 to 10. A low-elastic acrylic paint composition for waterproofing and anticorrosive of water-treated concrete structures, comprising weight%.
[Formula 1]

In the above formula, R ₁ and R ₂ are each independently a hydrogen atom or an alkyl group having 1 to 6 carbon atoms.
The method of claim 2,
The hydrated oxide is Goethite;
The Goethite is prepared by mixing a precursor material of iron oxide with an alcohol-based solvent, adding an aqueous sulfate solution to prepare a mixed solution, and then reacting the mixed solution at a temperature of 50 to 75°C and filtering and drying the mixture. Will;
The concentration of iron oxide in the mixture is 0.5 to 1 M, and the concentration of sulfate ions is 1 to 3 M;
The precursor material of the iron oxide is at least one selected from the group consisting of iron perchlorate (Fe(ClO ₄ ) ₃ , and iron phosphate (FePO ₄ ));
The aqueous sulfate solution is a low-elastic acrylic paint composition for waterproofing and anticorrosive of water-treated concrete structures, characterized in that at least one selected from the group consisting of lithium sulfate (Li ₂ SO ₄ ) and potassium sulfate (K ₂ SO ₄ ).
The method of claim 1,
The waterproof and anticorrosive low-elastic acrylic paint composition for the water-treated concrete structure further comprises 10 to 80 parts by weight of an inorganic filler based on 100 parts by weight of the mixture;
The inorganic filler contains 1 to 20 parts by weight of calcium metasilicate and 1 to 20 parts by weight of silk fibroin composite fibers including nephrite powder, based on 100 parts by weight of calcium carbonate. Elastic acrylic paint composition.
A waterproofing and anticorrosive construction method for a concrete structure using a waterproof and anticorrosive low-elastic acrylic paint composition for a water-treated concrete structure according to any one of claims 1 to 4,
Chipping and cleaning laitance, impurities, or deteriorated areas of the concrete structure; Treating the cracks, grooves or deteriorated areas generated after the cleaning step by using a fast-setting putty material; Forming a primer layer on the base surface-treated area to enhance adhesion; Forming a low elastic acrylic waterproof/anticorrosive layer by applying a waterproof/anticorrosive low-elastic acrylic paint composition for the water-treated concrete structure on the primer layer; Forming a low-elastic acrylic-based surface finish layer by applying a low-elastic acrylic-based surface finish material on the upper portion of the low-elastic acrylic-based waterproof/corrosive layer; And waterproofing and anticorrosive construction method of a concrete structure comprising the step of curing.

Images