KR102164580B1 - Eco friendly steel painting composition having enhanced durability and salt resistance for surface of steel structures and protection coating method for surface of steel structures using the same - Google Patents

Abstract

The present invention relates to an eco-friendly steel painting material composition and a method for protecting a surface of a steel structure using the same, wherein the eco-friendly steel painting material composition is, in an eco-friendly steel painting material composition having excellent durability and salt resistance, composed by mixing a main agent mixing polyurethane prepolymer, a functional filler, barium sulfate, a pigment, an additive, and a diluent, and a curing agent mixing polymerizable isocyanate, a functional filler, an additive, and a diluent, wherein the main agent and the curing agent is mixed in a ratio of 1 : 1 to 5 : 1, and the functional filler contains 20 to 50 wt% of a magnetite powder, 20 to 50 wt% of zero-valent iron-supported alginate-silicate beads, 1 to 17 wt% of hydroxide apatite, 1 to 17 wt% of iron hydroxide (Fe(OH)_3), and 1 to 17 wt% of sodium triphosphate (Na_3PO_4), thereby having a very excellent rust prevention effect on steel, and having excellent durability and salt resistance by reinforcing the surface of the steel structure.

Description

Eco-Friendly STEEL PAINTING COMPOSITION HAVING ENHANCED DURABILITY AND SALT RESISTANCE FOR SURFACE OF STEEL STRUCTURES AND PROTECTION COATING METHOD FOR SURFACE OF STEEL STRUCTURES USING THE ECO FRIENDLY STEEL PAINTING COMPOSITION

The present invention relates to an eco-friendly steel coating composition excellent in durability and salt resistance by reinforcing the surface of a steel structure, and a method for protecting the surface of a steel structure using the same.

In general, steel is used as a material for construction works, and is a metal containing more than 95% of iron and additives such as carbon, chromium, manganese, molybdenum, and nickel. Steel is made by mining and smelting iron ore, and is processed by methods such as rolling. Due to its excellent strength, these steels are used to support bridges and the like, and are now widely used as skeletons of various building structures. However, there is a problem that it is difficult to maintain the durability for a long time because there is a risk of corrosion such as rust even with the excellent strength of the steel. In particular, when steel is used as a support for bridges and structures, if corrosion occurs in the steel material, it cannot withstand the load of the bridge and the passing vehicle or train and bends, which can seriously damage the safety of the bridge and structure. There was this.

In order to solve this problem, there has been an effort to solve this problem by coating a waterproof composition on a steel structure, but after a certain period of time, the adhesive force decreases and the steel coating composition falls off, and eventually there is a problem that causes corrosion to the steel material.

Korean Patent Registration No. 10-1136838 Korean Patent Registration No. 10-1104812 Korean Patent Registration No. 10-0775662

The present invention has been devised to solve the above-described problems, and an embodiment of the present invention has a very improved effect of preventing rust on steel materials; To provide an eco-friendly steel coating composition with excellent durability and salt resistance.

In addition, another embodiment of the present invention is to provide a method for protecting the surface of a steel structure using an eco-friendly steel coating composition having excellent durability and salt resistance.

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.

In one embodiment of the present invention, in an eco-friendly steel coating composition having excellent durability and salt resistance, a ceramic-containing polyurethane prepolymer, a functional filler, a barium sulfate, a pigment, an additive and a diluent are mixed, and a polymerizable isocyanate, a functional filler, It is made by mixing a curing agent in which an additive and a diluent are mixed, and the main material and the curing agent are mixed in a ratio of 1:1 to 5:1 by volume;

The functional filler is 20 to 50% by weight of magnetite powder, 20 to 50% by weight of zero-valent iron-supported alginate-silicate beads, 1 to 17% by weight of hydroxide apatite, iron hydroxide (Fe(OH) ₃ ) 1 to 17% by weight, and sodium triphosphate ( Na ₃ PO ₄ ) Provides an eco-friendly steel coating composition excellent in durability and salt resistance that contains 1 to 17% by weight.

The zero-valent iron-supported alginate-silicate beads are prepared by mixing an aqueous sodium (Na) alginate solution and an aqueous sodium (Na) silicate solution, and then mixing an aqueous solution of iron sulfate hydrate (FeSO ₄ ·7H ₂ O) to prepare a complex aqueous solution; Adding and stirring an aqueous NaBH ₄ solution to the aqueous complex solution to form zero-valent iron in the aqueous complex solution; Synthesizing zero-valent iron-alginate-silicate beads by dropwise adding the composite aqueous solution containing zero-valent iron to an aqueous calcium chloride solution; And washing and drying the synthesized zero-valent iron-alginate-silicate beads.

The ceramic-containing polyurethane prepolymer may be prepared by reacting a polyol composition in which nano ceramic powder is dispersed with a diisocyanate compound in an organic solvent.

The nano ceramic powder is one or more selected from the group consisting of boron carbide (B ₄ C), borex (Na ₂ B ₄ O ₇ ), iron oxide (Fe ₃ O ₄ , Fe ₂ O ₃ ), and mixtures thereof. I can.

In addition, another embodiment of the present invention is a method for protecting the surface of a steel structure using an eco-friendly steel coating composition having excellent durability and salt resistance described, and using a surface treatment equipment, dust, rust, paint, black skin or foreign matter on the surface of the steel structure Treating the ground surface by inhaling with an inhaler while removing the material; Curing by applying the eco-friendly steel coating composition excellent in durability and salt resistance to the treated surface with a brush, roller or air spray; And after curing, applying the surface protection reinforced coating composition with a brush, roller or air spray; The surface protection reinforced coating composition is prepared by mixing a main material and a hardener in a weight ratio of 1:0.1 to 0.3; The subject is a mixture of acrylic polyol resin, functional filler, nano ceramic powder, magnesia, pigment, additive and diluent; The curing agent is a mixture of 1,6-diisocyanatohexane monomer and a diluent; The functional filler is 20 to 50% by weight of magnetite powder, 20 to 50% by weight of zero-valent iron-supported alginate-silicate beads, 1 to 17% by weight of hydroxide apatite, iron hydroxide (Fe(OH) ₃ ) 1 to 17% by weight, and sodium triphosphate ( Na ₃ PO ₄ ) It provides a method for protecting the surface of a steel structure containing 1 to 17% by weight.

The subject of the surface protection reinforced coating composition is to further include 0.01 to 2 parts by weight of monocalcium phosphate dihydrate based on 100 parts by weight of the acrylic polyol resin (Acryl Polyol); It may be one further comprising 0.01 to 2 parts by weight of sodium hyaluronate.

According to an eco-friendly steel coating composition having excellent durability and salt resistance according to an embodiment of the present invention and a surface protection method of a steel structure using the same, by containing a zero-valent iron-supported alginate-silicate bead, preventing the formation of an oxide film on the steel surface By doing so, there is a very excellent effect of preventing rust on the steel material. Therefore, there is an effect of preventing corrosion of reinforcing rebars in structures made of steel such as steel structures, steel bridges, steel decks, and road facility structures.

In addition, there is an effect of reinforcing the surface of a structure made of steel, forming an eco-friendly, physically and chemically stable coating film to improve properties such as strength, weather resistance, corrosion resistance, heat resistance, and durability.

Accordingly, it is possible to prevent deterioration and corrosion of the steel structure in the long term, and there is an effect of significantly reducing the maintenance cost used therein.

In addition, it not only prevents the emission of volatile organic compounds (VOCs) into the atmosphere during painting, but also reduces environmental pollution by adsorbing organic pollutants, and there is no elution of harmful heavy metals, so there is an environmentally friendly effect that is safe for the human body.

Hereinafter, a preferred embodiment according to the present invention will be described in detail. However, the following embodiments are provided so that the present invention may be sufficiently understood by those of ordinary skill in the art, and may be modified in various other forms, and the scope of the present invention is limited to the embodiments described below. It is not.

In one embodiment of the present invention, in an eco-friendly steel coating composition having excellent durability and salt resistance, a ceramic-containing polyurethane prepolymer, a functional filler, a barium sulfate, a pigment, an additive and a diluent are mixed, and a polymerizable isocyanate, a functional filler, It is made by mixing a curing agent in which an additive and a diluent are mixed, and the main material and the curing agent are mixed in a ratio of 1:1 to 5:1 by volume; The functional filler is 20 to 50% by weight of magnetite powder, 20 to 50% by weight of zero-valent iron-supported alginate-silicate beads, 1 to 17% by weight of hydroxide apatite, iron hydroxide (Fe(OH) ₃ ) 1 to 17% by weight, and sodium triphosphate ( Na ₃ PO ₄ ) Provides an eco-friendly steel coating composition excellent in durability and salt resistance that contains 1 to 17% by weight.

The functional filler of the eco-friendly steel coating composition having excellent durability and salt resistance according to an embodiment of the present invention prevents the formation of an oxide film on the surface of the steel, and thus has a very excellent effect of preventing rust and salt resistance. Therefore, there is an effect of preventing corrosion of reinforcing rebars in structures made of steel such as steel structures, steel bridges, steel decks, and road facility structures.

First, the magnetite powder is an oxide ceramic-based magnetic nanopowder, and is mixed with other components of the functional filler, so that the adhesion of the coating film and durability accordingly can be remarkably improved. The magnetite powder may further improve the above effects by using those having an average particle diameter of 30 to 100 nm. The magnetite powder is preferably contained in an amount of 20 to 50% by weight based on the functional filler. If the content of the magnetite powder is too small, the above-described improvement effect may be weak, and if the content of the magnetite powder is too high, the manufacturing cost may increase, thereby reducing economic efficiency.

In addition, the zero-valent iron-supported alginate-silicate beads may be mixed with other components of the functional filler to improve adhesion and durability of the coating film, as well as remarkably improve the corrosion resistance of the coating film. The zero-valent iron-supported alginate-silicate bead has an important technical feature in using the alginate-silicate bead as a support for supporting the zero-valent iron. The alginate has an eco-friendly advantage because it is inexpensive and does not require an organic solvent. In addition, by using alginate-silicate beads, the storage properties of the reducing agent and physical stability of the beads in use can be retained. The zero-valent iron-supported alginate-silicate beads may have an average diameter of 50 to 500 nm to further improve the above effect. The zero-valent iron-supported alginate-silicate beads are preferably contained in an amount of 20 to 50% by weight based on the functional filler. If the content of the zero-valent iron-supported alginate-silicate bead is too small, the above-described improvement effect may be weak, and if the content of the zero-valent iron-supported alginate-silicate bead is too large, the manufacturing cost may be increased, resulting in lower economic efficiency.

More specifically, the zero-valent iron-supported alginate-silicate beads are prepared by mixing an aqueous sodium (Na) alginate solution and an aqueous sodium (Na) silicate solution, and then mixing an aqueous solution of iron sulfate hydrate (FeSO ₄ 7H ₂ O) to prepare a composite aqueous solution. step; Adding and stirring an aqueous NaBH ₄ solution to the aqueous complex solution to form zero-valent iron in the aqueous complex solution; Synthesizing zero-valent iron-alginate-silicate beads by dropwise adding the composite aqueous solution containing zero-valent iron to an aqueous calcium chloride solution; And washing and drying the synthesized zero-valent iron-alginate-silicate beads, it is possible to dramatically improve the corrosion resistance of the coating film.

More specifically, the zero-valent iron-supported alginate-silicate beads are mixed with a sodium (Na) alginate aqueous solution having a concentration of 10 to 20% by weight and a sodium (Na) silicate aqueous solution having a concentration of 10 to 20% by weight in a ratio of 100: 100 by volume, A composite aqueous solution was prepared by mixing 50 to 150 parts by volume of an aqueous solution of iron sulfate hydrate (FeSO ₄ ·7H ₂ O) having a concentration of 0.5 to 3% by weight.

Thereafter, an aqueous solution of NaBH _{4 having a} concentration of 0.05 to 1% by weight is gradually added to the composite aqueous solution and stirred to form zero-valent iron in the composite aqueous solution. At this time, the NaBH ₄ aqueous solution serves to reduce the iron sulfate hydrate (FeSO ₄ ·7H ₂ O) to zero-valent iron. In addition, the composite aqueous solution is preferably stirred at a speed of 800 to 1500 rpm in order to uniformly stir and prevent the aggregation of zero-valent iron.

The zero-valent iron-alginate-silicate beads were synthesized by dropwise addition of the composite aqueous solution containing the zero-valent iron to an aqueous calcium chloride solution having a concentration of 5 to 10% by weight, and then the synthesized zero-valent iron-alginate-silicate beads were washed and dried. Iron-alginate-silicate beads can be prepared. Thereby, the zero iron can be fixed in the alginate-silicate bead.

The hydroxyapatite may be mixed with other components of the functional filler to improve the strength, chemical resistance and abrasion resistance of the coating film, and thus durability, as well as the corrosion resistance of the coating film. It is preferable that the hydroxyapatite is contained in an amount of 1 to 17% by weight based on the functional filler. If the content of the hydroxyapatite is too small, the above-described improvement effect may be weak, and if the content of the hydroxyapatite is too large, the manufacturing cost may be increased, and thus economic feasibility may be reduced.

The iron hydroxide (Fe(OH) ₃ ) is mixed with other components of the functional filler to improve abrasion resistance and heat resistance of the coating film and durability accordingly, as well as dramatically improve the corrosion resistance of the coating film. The iron hydroxide (Fe(OH) ₃ ) is preferably contained in an amount of 1 to 17% by weight based on the functional filler. If the content of the iron hydroxide (Fe(OH) ₃ ) is too small, the above-described improvement effect may be weak, and if the content of the iron hydroxide (Fe(OH) ₃ ) is too high, the manufacturing cost may be increased and economic feasibility may be reduced.

The sodium triphosphate (Na ₃ PO ₄ ) is mixed with other components of the functional filler to improve the strength and chemical resistance of the coating film and the resulting durability, as well as improve workability, and dramatically improve the corrosion resistance of the coating film. It can be improved. The sodium triphosphate (Na ₃ PO ₄ ) is preferably contained in an amount of 1 to 17% by weight based on the functional filler. If the content of the sodium triphosphate (Na ₃ PO ₄ ) is too small, the above-described improvement effect may be weak, and if the content of the sodium triphosphate (Na ₃ PO ₄ ) is too high, the manufacturing cost may be increased and thus economic feasibility may be reduced.

The subject matter is, based on 100 parts by weight of a ceramic-containing polyurethane prepolymer, 50 to 150 parts by weight of a functional filler, 1 to 20 parts by weight of barium sulfate, 10 to 20 parts by weight of a pigment, 1 to 10 parts by weight of an additive, and 10 to 30 parts by weight of a diluent. By using a mixture, there are excellent effects in strength, weather resistance, corrosion resistance, heat resistance, durability, and salt decomposition resistance.

More specifically, the ceramic-containing polyurethane prepolymer included in the subject is mixed with other components of the subject to improve strength and adhesion, and durability such as abrasion resistance, heat resistance, salt resistance, chemical resistance, and the like may be improved.

More specifically, the above-described effect may be further improved by using the ceramic-containing polyurethane prepolymer prepared by reacting a polyol composition in which nanoceramic powder is dispersed with a diisocyanate compound in an organic solvent. At this time, the polyol composition in which the nanoceramic powder is dispersed may be prepared by dispersing 5 to 40% by weight of the nanoceramic powder in the polyol and then performing ball milling. Accordingly, the dispersibility of the nanoceramic powder can be further improved. As a result, the above-described effects can be further improved.

At this time, the type of polyol is not particularly limited as a polyol known in the art may be used. However, non-limiting examples of the polyol may be polyester diol, polyether diol, polycarbonate diol, polycaprolactone diol, polyalkylene glycol such as polypropylene glycol, polyethylene glycol, and acrylic polyol.

In addition, the polyol may further include triols to control adhesion, waterproofness, and durability by controlling the degree of crosslinking. It is preferable to use at least one selected from the group consisting of trimethylolpropane, polycaprolactam triol, and mixtures thereof as the triol. These triols are included in the range of 5 to 30% by weight of the total polyol to further improve the above effects.

In addition, the polyol preferably has a molecular weight of 600 to 6000, more preferably, using a molecular weight of 1000 to 3000, there is an effect of further improving the adhesion and durability of the steel structure to the surface.

In addition, the nanoceramic powder may form a surface having a dense and high hardness while reducing the weight of the composition. More specifically, the nano ceramic powder is 1 selected from the group consisting of boron carbide (B ₄ C), borex (Na ₂ B ₄ O ₇ ), iron oxide (Fe ₃ O ₄ , Fe ₂ O ₃ ), and mixtures thereof. By using more than one species, it is evenly dispersed in the coating film with excellent dispersing power, thereby further improving the above-described effect. In addition, the nano-ceramic powder has an average diameter of 1 to 300 nm, so that the above-described effect can be further improved. The nano ceramic powder is preferably contained in the above content range in consideration of strength, weather resistance, abrasion resistance and durability.

In addition, the organic solvent may be selectively used a conventional organic solvent known in the art, for example, benzene, toluene, ethyl acetate, acetone, methyl ethyl ketone, diethyl ether, tetrahydrofuran, methyl acetate, aceto Nitrile, chloroform, methylene chloride, carbon tetrachloride, 1,2-dichloroethane, 1,1,2-trichloroethane, tetrachloroethylene, N-methylpyrrolidone, dipropylene glycol dimethyl ether, etc. Can be used. In a preferred embodiment of the present invention, the organic solvent is preferably a non-toxic organic solvent, dipropylene glycol dimethyl ether.

Further, the diisocyanate compound may be used by mixing one type or two or more types of conventional diisocyanate compounds known in the art. For example, tolyene diisocyanate, diphenylmethane-4,4'-diisocyanate, p-phenylene diisocyanate, xylylene diisocyanate, 1,5-naphthylene diisocyanate, 3,3'-dimethyldiphenyl-4 Aromatic diisocyanates such as ,4'-diisocyanate, dianicidine isocyanate, and tetramethylxylylene diisocyanate; Alicyclic diisocyanates such as isophorone diisocyanate, dicyclohexylmethane-4,4'-diisocyanate, trans-1,4-cyclohexyl diisocyanate, and norbornene diisocyanate; Aliphatic diisocyanates, such as 1,6-hexamethylene diisocyanate, 2,4 and/or (2,4,4)-trimethylhexamethylene diisocyanate, and lysine diisocyanate, are mentioned. More preferably, isophorone diisocyanate or dicyclohexylmethane-4,4'-diisocyanate is used.

In addition, barium sulfate contained in the subject matter is used to improve filling, impact resistance, heat retention and fire resistance. The barium sulfate is preferably contained in the above content range in consideration of the above effects and workability.

In addition, the pigments contained in the subject matter are used to improve the aesthetics by imparting color to the composition. The pigment may be made of at least one material selected from titanium dioxide, red iron oxide, yellow iron oxide, chromium oxide (Cr ₂ O ₃ ), purple iron oxide, black iron oxide, carbon black, and barium sulfate.

In addition, in order to further improve the adhesive strength, and greatly improve the acid resistance, chemical resistance, and antibacterial properties, the subject further comprises 0.1 to 5 parts by weight of allyl isothiocyanate based on 100 parts by weight of the ceramic-containing polyurethane prepolymer. I can. If the content of the allyl isothiocyanate is too small, the above-described improvement effect may be weak, and if the content of the allyl isothiocyanate is too high, there is a problem that price competitiveness may be lowered.

Meanwhile, the curing agent is a mixture of 300 to 400 parts by weight of a functional filler, 10 to 20 parts by weight of an additive, and 30 to 90 parts by weight of a diluent, based on 100 parts by weight of the polymerizable isocyanate, and the coating strength, elongation, impact resistance, and abrasion resistance , It has excellent effects in salt resistance, rust prevention and chemical resistance.

More specifically, the polymerizable isocyanate includes an aromatic isocyanate, and by using one or more isocyanates having two or more isocyanate groups, excellent durability is achieved according to the improvement of miscibility, toughness and elongation between components. have. Accordingly, it is possible to provide an effect of preventing easily peeling off from the base surface or easily cracking from the painted surface due to excellent adhesion to the steel structure.

The aromatic isocyanate is an isocyanate in which two or more isocyanate groups are directly bonded to an aromatic ring, and may include a dimer, a trimer, and a prepolymer. Specifically, tolylene diisocyanate, 4,4'-diphenylmethane diisocyanate, phenylene diisocyanate, etc. are mentioned, and can be used 1 type or in combination of 2 or more types. These isocyanates contain an aromatic isocyanate in an amount of 80 to 100% by weight.

More specifically, it is preferable that the aromatic isocyanate contains tolylene diisocyanate, and it is more preferable that it consists of tolylene diisocyanate.

The tolylene diisocyanate is at least one isocyanate selected from 2,4-tolylene diisocyanate and 2,6-tolylene diisocyanate. Examples of the tolylene diisocyanate include 2,4-tolylene diisocyanate, 2,6-tolylene diisocyanate, or a mixture of 2,4-tolylene diisocyanate and 2,6-tolylene diisocyanate. The tolylene diisocyanate is preferably 2,4-tolylene diisocyanate, and specifically, 2,4-tolylene diisocyanate alone, or 2,4-tolylene diisocyanate and 2,6-tolyl It can be used as a mixture of rendiisocyanate. In the case of using the mixture, the mixing ratio of 2,4-tolylene diisocyanate and 2,6-tolylene diisocyanate is more preferably in the range of 1: 1 to 1.5.

Further, the aromatic isocyanate may contain, in addition to the aromatic isocyanate, an isocyanate having two or more isocyanate groups. As such an isocyanate, an aliphatic isocyanate, an alicyclic isocyanate, a heterocyclic isocyanate, etc. are mentioned.

At this time, as the aliphatic isocyanate, hexamethylene diisocyanate, 2,2,4-trimethylhexamethylene diisocyanate, 2,4,4-trimethylhexamethylene diisocyanate, lysine diisocyanate methyl ester, lysine triisocyanate, m- Xylylene isocyanate, α,α,α',α'-tetramethylxylylenediisocyanate, bis(isocyanatomethyl)naphthalene, mesitylene triisocyanate, bis(isocyanatomethyl)sulfide, bis (Isocyanatoethyl) sulfide, bis (isocyanatomethyl) disulfide, bis (isocyanatoethyl) disulfide, bis (isocyanatomethylthio) methane, bis (isocyanatoethyl) Thio)methane, bis(isocyanatoethylthio)ethane, bis(isocyanatomethylthio)ethane, and the like.

In addition, as the alicyclic isocyanate, isophorone diisocyanate, bis (isocyanatomethyl) cyclohexane, dicyclohexylmethane diisocyanate, cyclohexane diisocyanate, methylcyclohexane diisocyanate, dicyclohexyldimethylmethane isocyanate, 2 ,5-bis(isocyanatomethyl)bicyclo-[2,2,1]-heptane, 2,6-bis(isocyanatomethyl)bicyclo-[2,2,1]-heptane, 3 ,8-bis(isocyanatomethyl)tricyclodecane, 3,9-bis(isocyanatomethyl)tricyclodecane, 4,8-bis(isocyanatomethyl)tricyclodecane, 4,9 -Bis(isocyanatomethyl)tricyclodecane, etc. are mentioned.

In addition, as the heterocyclic isocyanate, 2,5-diisocyanatothiophene, 2,5-bis(isocyanatomethyl)thiophene, 2,5-diisocyanatotetrahydrothiophene, 2,5- Bis(isocyanatomethyl)tetrahydrothiophene, 3,4-bis(isocyanatomethyl)tetrahydrothiophene, 2,5-diisocyanato-1,4-ditian, 2,5- Bis(isocyanatomethyl)-1,4-dithian, 4,5-diisocyanato-1,3-dithiolane, 4,5-bis(isocyanatomethyl)-1,3-dithi Orlan, etc. are mentioned.

Meanwhile, the functional fillers included in the main material and the curing agent are as already described for the "functional filler".

In addition, the additives included in the main material and the curing agent may further include any one or more selected from a curing accelerator, a reaction initiator, a polyamide, and a defoaming agent. These additives are commonly used in the art and do not specifically limit the kind. As a non-limiting example of the curing accelerator, considering curing time, any one of polyethylene polyamine, tetraethylene pentamine, and polyamidoamine may be selected and used. Non-limiting examples of the reaction initiator include benzoyl peroxide, acetyl peroxide, dilauryl peroxide, di-tert-butyl peroxide, cumyl hydroperoxide, azobisisobutyronitrile, hydrogen peroxide, considering the reaction rate. At least one selected from potassium persulfate and mixtures thereof may be selected and used. The polyamide imparts fluidity, cohesive force and material separation prevention property, and incidentally, can obtain side effects such as water pollution prevention, reinforcement protection of steel structures, self-repair function, etc. due to excellent cohesion. In addition, non-limiting examples of antifoaming agents for removing air bubbles to increase strength and durability include alcohol-based antifoaming agents, silicone-based antifoaming agents, fatty acid-based antifoaming agents, oil-based antifoaming agents, ester-based antifoaming agents, oxyalkylene-based antifoaming agents, and the like. Examples of the silicone-based antifoaming agent include dimethyl silicone oil, polyorganosiloxane, and fluorosilicone oil. Examples of the fatty acid-based antifoaming agent include stearic acid and oleic acid. The oil-based antifoaming agent includes kerosene, animal and vegetable oil, castor oil, and the like. Examples of the ester-based antifoaming agent include solitol trioleate and glycerol monoricinolate. Examples of the oxyalkylene antifoaming agent include polyoxyalkylene, acetylene ethers, polyoxyalkylene fatty acid esters, and polyoxyalkylenealkylamines. Examples of the alcohol-based antifoaming agent include glycol.

In addition, the diluent included in the main material and the curing agent is generally used in the art, and the kind is not particularly limited, but, for example, ethyl acetate, acetone, methyl ethyl ketone, diethyl ether, tetrahydrofuran, methyl acetate , Acetonitrile, chloroform, methylene chloride, carbon tetrachloride, 1,2-dichloroethane, 1,1,2-trichloroethane, tetrachloroethylene, N-methylpyrrolidone, dipropylene glycol dimethyl ether, and mixtures thereof One or more selected from the group may be used. More specifically, the diluent included in the subject matter may further improve the effects of the present invention by using a mixed diluent in which methyl ethyl ketone and ethyl acetate are mixed in a weight ratio of 2: 3, respectively. In addition, the diluent included in the curing agent may further improve the effect of the present invention by using ethyl acetate.

By mixing the subject and the curing agent in a ratio of 1:1 to 5:1 on a volume basis, the effect of the present invention can be further improved.

Hereinafter, a method of protecting a surface of a steel structure using an eco-friendly steel coating composition having excellent durability and salt resistance according to a preferred embodiment of the present invention, and a method of manufacturing a surface protection reinforced coating composition that can be coated with the same will be described.

Another embodiment of the present invention is a method for protecting the surface of a steel structure using an eco-friendly steel coating composition having excellent durability and salt resistance described, and removing dust, rust, paint, black skin or foreign matter from the surface of the steel structure using a surface treatment equipment While inhaling with an inhaler or the like to treat the ground surface; Curing by applying the eco-friendly steel coating composition excellent in durability and salt resistance to the treated surface with a brush, roller or air spray; And after curing, applying the surface protection reinforced coating composition with a brush, roller or air spray; The surface protection reinforced coating composition is prepared by mixing a main material and a hardener in a weight ratio of 1:0.1 to 0.3; The subject is a mixture of acrylic polyol resin, functional filler, nano ceramic powder, magnesia, pigment, additive and diluent; The curing agent is a mixture of 1,6-diisocyanatohexane monomer and a diluent; The functional filler is 20 to 50% by weight of magnetite powder, 20 to 50% by weight of zero-valent iron-supported alginate-silicate beads, 1 to 17% by weight of hydroxide apatite, iron hydroxide (Fe(OH) ₃ ) 1 to 17% by weight, and sodium triphosphate ( Na ₃ PO ₄ ) It provides a method for protecting the surface of a steel structure containing 1 to 17% by weight. Thereby, there is an effect of further improving weather resistance, ozone resistance, fouling resistance, UV resistance, and the like.

The method of protecting the surface of the steel structure may further include forming a primer layer with a brush, roller or air spray before applying the surface protection reinforced coating composition. In this case, the primer layer is generally used in the art, and its type is not particularly limited.

The term steel structures is used to include all structures made of steel such as road facilities, bridges, steel bridges, and steel decks.

The step of curing by applying the eco-friendly steel coating composition excellent in durability and salt resistance with a brush, roller or air spray can sufficiently provide the effects of the present invention by performing one time, but by performing the above steps 1 to 3 times, The effect of the present invention can be further improved. More preferably, it is good to perform the above step twice.

The surface protection reinforced coating composition is prepared by mixing a main body and a curing agent in a weight ratio of 1: 0.1 to 0.3, and the subject is an acrylic polyol resin (Acryl Polyol) 100 parts by weight, functional filler 15 to 25 parts by weight, 1 to 5 parts by weight of nano ceramic powder, 1 to 5 parts by weight of magnesia, 30 to 50 parts by weight of pigment, 1 to 10 parts by weight of additive, and 50 to 90 parts by weight of diluent are mixed; The above-described effect may be further improved by mixing 80 to 120 parts by weight of a diluent with respect to 100 parts by weight of 1,6-diisocyanatohexane homopolymer as the curing agent.

More specifically, the acrylic polyol resin is produced by adding 15 to 40% by weight of a hydroxyl-containing monomer, 10 to 30% by weight of a methacrylate-based monomer, 3 to 20% by weight of an acrylate-based monomer, and the remaining amount of an aromatic monomer. By using a product manufactured by copolymerizing an acrylic resin, it is possible to further improve weather resistance, stain resistance, water resistance, fire resistance, and chemical resistance.

At this time, the hydroxyl group-containing monomer is generally known in the art, and its type is not particularly limited, but, for example, 2-hydroxy ethyl methacrylate, 2-hydroxy propyl methacrylate, 2-hydroxy ethyl At least one selected from the group consisting of acrylate, 2-hydroxy propyl acrylate, 4-hydroxy butyl acrylate, 2-hydroxy 3-phenoxy propyl acrylate, and mixtures thereof may be preferably used.

In addition, the methacrylate-based monomer is generally known in the art, and its kind is not particularly limited, but, for example, methyl methacrylate, n-butyl methacrylate, i-butyl methacrylate, t- Butyl methacrylate, ethyl acrylate, isobornyl methacrylate, 2-ethyl hexyl methacrylate, isodecyl methacrylate, n-lauryl methacrylate, n-stearyl methacrylate, cyclohexyl methacrylate , 2-phenoxy ethyl methacrylate, and at least one selected from the group consisting of mixtures thereof may be preferably used.

In addition, the acrylate-based monomer is generally known in the art, and its kind is not particularly limited, but, for example, methyl acrylate, ethyl acrylate, n-butyl acrylate, i-butyl acrylate, 2- Ethyl hexyl acrylate, isobornyl acrylate, isoamyl acrylate, lauryl acrylate, stearyl acrylate, butoxy ethyl acrylate, phenoxy ethyl acrylate, and at least one selected from the group consisting of a mixture thereof It can be used preferably.

In addition, the aromatic monomer is generally known in the art, and its kind is not particularly limited, but, for example, a styrene monomer may be preferably used.

In addition, magnesia contained in the surface protection reinforced coating composition is used to further improve impermeability and durability by increasing the crack resistance, flexural strength and compressive strength of the coating film. In particular, there is an effect of expressing fast setting properties and excellent curing properties in a low temperature environment. The magnesia is preferably contained in the above content range in consideration of such an improvement effect.

In addition, the subject of the surface protection reinforced coating composition is mixed with other components of the surface protection reinforced coating composition to further improve the adhesive strength and greatly improve chemical resistance, further comprising monocalcium phosphate dihydrate. I can. The monocalcium phosphate dihydrate may further contain 0.01 to 2 parts by weight based on 100 parts by weight of the acrylic polyol resin. If the content of the monocalcium phosphate dihydrate is too small, the above-described improvement effect may be weak, and if the content of the monocalcium phosphate dihydrate is too large, there is a problem in that the manufacturing cost is high and price competitiveness may be lowered.

In addition, the subject of the surface protection reinforced coating composition is mixed with other components of the surface protection reinforced coating composition to facilitate viscosity control, further improve adhesive strength, and greatly improve chemical resistance, hyaluronic acid It may further contain sodium. The sodium hyaluronate may further contain 0.01 to 2 parts by weight based on 100 parts by weight of the acrylic polyol resin. If the content of sodium hyaluronate is too low, the above-described improvement effect may be weak, and if the content of sodium hyaluronate is too high, there is a problem in that the manufacturing cost may increase and price competitiveness may be lowered.

In addition, functional fillers, nano ceramic powders, pigments, additives and diluents included in the surface protection reinforced coating composition are as described in the environmentally friendly steel coating composition having excellent durability and salt resistance.

According to an eco-friendly steel coating composition having excellent durability and salt resistance according to an embodiment of the present invention and a surface protection method of a steel structure using the same, by containing a zero-valent iron-supported alginate-silicate bead, preventing the formation of an oxide film on the steel surface By doing so, there is a very excellent effect of preventing rust on the steel material. Therefore, there is an effect of preventing corrosion of reinforcing rebars in structures made of steel such as steel structures, steel bridges, steel decks, and road facility structures.

In addition, there is an effect of reinforcing the surface of a structure made of steel, forming an eco-friendly, physically and chemically stable coating film to improve properties such as strength, weather resistance, corrosion resistance, heat resistance, and durability.

Accordingly, it is possible to prevent deterioration and corrosion of the steel structure in the long term, and there is an effect of significantly reducing the maintenance cost used therein.

In addition, it not only prevents the emission of volatile organic compounds (VOCs) into the atmosphere during painting, but also reduces environmental pollution by adsorbing organic pollutants, and there is no elution of harmful heavy metals, so there is an environmentally friendly effect that is safe for the human body.

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.

<Production Example> Preparation of zero-valent iron-supported alginate-silicate beads

After mixing 12% by weight of sodium (Na) alginate aqueous solution and 7% by weight of sodium (Na) silicate aqueous solution in a volume ratio of 100: 100, thereto 1% by weight of iron sulfate hydrate (FeSO ₄ · 7H ₂ O) 80 parts by volume of an aqueous solution were mixed to prepare a composite aqueous solution.

Thereafter, 120 parts by weight of an aqueous solution of NaBH ₄ having a concentration of 0.1% by weight was added to the composite aqueous solution at a rate of 5 ml/min and stirred to form zero-valent iron in the composite aqueous solution. In addition, the composite aqueous solution was stirred at a speed of 900 rpm.

The zero-valent iron-alginate-silicate beads were synthesized by dropwise addition of the composite aqueous solution containing the zero-valent iron to a 5% by weight aqueous calcium chloride solution being stirred at a speed of 300 rpm, and the synthesized zero-valent iron-alginate-silicate beads were washed. And dried.

The zero-valent iron-alginate-silicate beads prepared in this way were found to have an average diameter of about 425 nm.

<Example 1> Eco-friendly steel coating composition excellent in durability and salt resistance

As a functional filler, 37% by weight of magnetite powder, 42% by weight of zero-valent iron-supported alginate-silicate beads prepared in the above Preparation Example, 11% by weight of hydroxide apatite, 3% by weight of iron hydroxide (Fe(OH) ₃ ) and 3% by weight of sodium triphosphate (Na ₃ PO ₄ ) 7% by weight was mixed and used.

In addition, as a ceramic-containing polyurethane prepolymer, boron carbide (B ₄ C) and borex (Na ₂ B ₄ O ₇ ) were mixed in a ratio of 2: 1 to 15% by weight of nano ceramic powder (average diameter of 97 nm). After dispersing in polyol (polyethylene glycol 30% by weight, polycaprolactonediol 50% by weight, trimethylolpropane 20% by weight), after performing ball milling, the polyol composition was distilled in an organic solvent (dipropylene glycol dimethyl ether). What was prepared by reacting with an isocyanate compound (dicyclohexylmethane-4,4'-diisocyanate) was used.

On the other hand, based on 100 parts by weight of the prepared ceramic-containing polyurethane prepolymer, 80 parts by weight of the prepared functional filler, 8 parts by weight of barium sulfate, 5 parts by weight of pigment, 3 parts by weight of an antifoam and a diluent (methyl ethyl ketone and ethyl acetate are added 2: Mixing at 3 weight ratio) 16 parts by weight of the mixture; And

Based on 100 parts by weight of the polymerizable isocyanate containing 87% by weight of tolylene diisocyanate, 10% by weight of hexamethylene diisocyanate and 3% by weight of isophorone diisocyanate, 370 parts by weight of the prepared functional filler, 12 parts by weight of an antifoam and a diluent (ethyl Acetate) 80 parts by weight of the curing agent was mixed in a ratio of 2:1 based on the volume to prepare an eco-friendly steel coating composition having excellent durability and salt resistance.

<Comparative Example 1>

25% by weight of heavy calcium carbonate and 75% by weight of a polyurethane prepolymer were added and stirred with a forced mixer for 3 minutes to prepare a coating composition.

The following test examples show experimental results comparing the characteristics of the examples according to the present invention and the comparative examples so that the characteristics of the examples according to the present invention can be more easily grasped.

<Test Example 1>

In order to compare the physical properties of the eco-friendly steel coating composition with excellent durability and salt resistance prepared according to the Example with the coating composition prepared in Comparative Example, the condition in the container, drying time, and the like according to the test method shown in Table 1 below, Pot life, flow test, volume solids, specific gravity, consistency, softness, salt spray test were performed, and the results are shown in Table 1 below.

division Example 1 Comparative Example 1 Test Methods State within the container clear clear KS M 5000-2011 Drying time (curing, h, 25 ℃) 9 18 KS M 5000-2511
KS M 5000-2512 Pot life (mixing, h, 20 ℃) 3 6 KS M ISO 9514 Flowability (mixed, μm) 281 259 KS M ISO 16862 Volume solids (mixed, %) 87 69 KS M ISO 3233 Specific gravity (subject) (25°/25°C) 1.4 1.3 KS M ISO 2811-1 Lead (topic, KU)(25°/25℃) 98 96 KS M 5000-2122 Degree of softness (subject, NS) 6 4 KS M 5000-2141 Salt spray test (168h) clear clear KS D 9502

As shown in Table 1, it was confirmed that the performance of the eco-friendly steel coating composition having excellent durability and salt resistance prepared according to the example of the present invention was excellent compared to the performance of the coating material composition prepared in the comparative example.

<Example 2> Surface protection reinforced coating composition

As a surface protection reinforced coating composition, a main material and a curing agent were mixed in a weight ratio of 1:0.3.

The subject matter is, based on 100 parts by weight of an acrylic polyol resin, 23 parts by weight of the functional filler prepared in Example 1, 3 parts by weight of the nano ceramic powder used in Example 1, 1.5 parts by weight of magnesia, 35 parts by weight of the pigment Parts, 3.5 parts by weight of a curing accelerator (polyethylene polyamine) and 60 parts by weight of a diluent (methyl ethyl ketone and ethyl acetate are mixed in a 2: 3 weight ratio) are mixed; The curing agent is based on 100 parts by weight of 1,6-diisocyanatohexane monomer, 85 parts by weight of diluent (ethyl acetate), 0.5 parts by weight of monocalcium phosphate dihydrate and 0.5 parts by weight of sodium hyaluronate Using a mixture of parts, stirred in a forced mixer for 5 minutes to prepare a surface protection reinforced coating composition.

The acrylic polyol resin comprises 18% by weight of a hydroxyl-containing monomer (2-hydroxyethyl methacrylate), 22% by weight of a methacrylate-based monomer (t-butyl methacrylate), and an acrylate-based monomer (phenoxy ethyl acrylic). Rate) 11% by weight and the remaining amount of the aromatic monomer (styrene monomer) was added to the resulting acrylic resin copolymerized was used.

<Test Example 2>

In order to determine the physical properties of the surface protection reinforced coating composition prepared according to Example 2, dry coating conditions, conditions in the container, color, non-volatile content, softness, gloss, drying time, flow according to the test methods shown in Table 2 below. The results of each of the tests were performed on the properties, hiding rate, alkali resistance, acid resistance, and accelerated weather resistance, and are shown in Table 2 below.

division Example 2 Test Methods Dry film condition clear KS M 5000-2421 State within the container clear KS M 5000-2011 color clear KS M 5000-3011 Non-volatile content (subject, weight%) 77 KS M ISO 3251 Degree of softness (subject, NS) 8 KS M 5000-2141 Gloss (60°) 75 KS M ISO 2813 Drying time (curing, h, 25 ℃) 5 KS M 5000-2511
KS M 5000-2512 Flowability (mixed, μm) 182 KS M ISO 16862 Concealment rate (%) White 96 KS M ISO 2814 Other colors
(Other colors except white) 89 Alkali resistance clear KS M ISO 2812-1 Acid resistance clear KS M ISO 2812-1 Accelerated weatherability (300h, gloss retention rate (%)) 95 KS M ISO 11507

As shown in Table 2, the surface protection reinforced coating composition prepared according to Example 2 had remarkably high performance exceeding the standard.

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 (6)

In the eco-friendly steel coating composition excellent in durability and salt resistance,
With a mixture of ceramic-containing polyurethane prepolymer, functional filler, barium sulfate, pigment, additive and diluent,
It is made by mixing a curing agent in which a polymerizable isocyanate, a functional filler, an additive and a diluent are mixed,
The subject and the curing agent are mixed in a ratio of 1:1 to 5:1 by volume;
The functional filler is 20 to 50% by weight of magnetite powder, 20 to 50% by weight of zero-valent iron-supported alginate-silicate beads, 1 to 17% by weight of hydroxide apatite, iron hydroxide (Fe(OH) ₃ ) 1 to 17% by weight, and sodium triphosphate ( Na ₃ PO ₄ ) Eco-friendly steel coating composition excellent in durability and salt resistance, characterized in that it contains 1 to 17% by weight.
The method of claim 1,
The zero-valent iron-supported alginate-silicate beads are
Preparing a complex aqueous solution by mixing an aqueous sodium (Na) alginate solution and an aqueous sodium (Na) silicate solution, and then mixing an aqueous solution of iron sulfate hydrate (FeSO ₄ ·7H ₂ O);
Adding and stirring an aqueous NaBH ₄ solution to the aqueous complex solution to form zero-valent iron in the aqueous complex solution;
Synthesizing zero-valent iron-alginate-silicate beads by dropwise adding the composite aqueous solution containing zero-valent iron to an aqueous calcium chloride solution; And
An eco-friendly steel coating composition having excellent durability and salt resistance, characterized in that produced by a manufacturing method comprising washing and drying the synthesized zero-valent iron-alginate-silicate beads.
The method of claim 1,
The ceramic-containing polyurethane prepolymer is an eco-friendly steel coating composition having excellent durability and salt resistance, characterized in that produced by reacting a polyol composition in which nanoceramic powder is dispersed with a diisocyanate compound in an organic solvent.
The method of claim 3,
The nano-ceramic powder is boron carbide (B ₄ C), borex (Na ₂ B ₄ O ₇ ), iron oxide (Fe ₃ O ₄ , Fe ₂ O ₃ ) and one or more selected from the group consisting of a mixture thereof Eco-friendly steel coating composition with excellent durability and salt resistance.
As a method for protecting the surface of a steel structure using an eco-friendly steel coating composition having excellent durability and salt resistance according to any one of claims 1 to 4,
Removing dust, rust, paint, black skin, or foreign substances from the surface of the steel structure using a surface treatment equipment, while inhaling it with an inhaler to treat the base surface; Curing by applying the eco-friendly steel coating composition excellent in durability and salt resistance to the treated surface with a brush, roller or air spray; And after curing, applying the surface protection reinforced coating composition with a brush, roller or air spray;
The surface protection reinforced coating composition is prepared by mixing a main material and a hardener in a weight ratio of 1:0.1 to 0.3;
The subject is a mixture of acrylic polyol resin, functional filler, nano ceramic powder, magnesia, pigment, additive and diluent;
The curing agent is a mixture of 1,6-diisocyanatohexane monomer and a diluent;
The functional filler is 20 to 50% by weight of magnetite powder, 20 to 50% by weight of zero-valent iron-supported alginate-silicate beads, 1 to 17% by weight of hydroxide apatite, iron hydroxide (Fe(OH) ₃ ) 1 to 17% by weight, and sodium triphosphate ( Na ₃ PO ₄ ) Surface protection method of a steel structure comprising 1 to 17% by weight.
The method of claim 5,
The subject of the surface protection reinforced coating composition is
It further comprises 0.01 to 2 parts by weight of monocalcium phosphate dihydrate based on 100 parts by weight of the acrylic polyol resin (Acryl Polyol); Surface protection method of a steel structure, characterized in that it further comprises 0.01 to 2 parts by weight of sodium hyaluronate.