KR101924923B1 - Steel coating composition with improved abrasion resistance and durability and protection coating method for steel structures therewith including pretreatment using laser pretreatment device - Google Patents

Abstract

The present invention relates to a steel coating agent composition with excellent abrasion resistance and durability and a steel structure protecting coating method including a pretreatment process using the steel coating agent composition and a laser beam surface treatment device. The steel coating agent composition of the present invention comprises 1 to 45 wt% of modified filler and 55 to 99 wt% of a performance modifier. The modified filler comprises: 15 to 98 wt% of ground calcium carbonate; 1 to 30 wt% of fine ceramic; 0.1 to 20 wt% of beryllium oxide; 0.1 to 20 wt% of boron nitride; 0.01 to 15 wt% of chromium oxide; 0.01 to 10 wt% of carbonfiber ash; and 0.001 to 5 wt% of graphene with respect to the weight of the modified filler. According to the present invention, the steel coating agent composition can prevent the coating layer from being easily peeled off from a base surface or prevent cracking from being easily generated in the coating layer on a coated surface since the coating layer has excellent adhesive power with a steel structure, improves durability by maintaining excellent abrasion resistance, bending resistance and impact resistance, and can enhance durability by blocking corrosion, ultraviolet rays and other deterioration factors of the steel structure. Further, the steel coating agent composition can minimize scattering of dust, alien substances and the like generated when performing an existing blasting process by using a laser beam surface treatment device, and can prevent induction of a traffic jam or generation of an environmental problem by completely removing all alien substances.

Description

TECHNICAL FIELD [0001] The present invention relates to a steel coating composition having excellent abrasion resistance and durability, and a pretreatment process using a laser beam surface treatment apparatus using the steel coating composition. [0002] The present invention relates to a steel coating composition having excellent abrasion resistance and durability, USING LASER PRETREATMENT DEVICE}

The present invention relates to a steel coating composition excellent in durability such as strength, adhesive strength, abrasion resistance, flame retardancy, chemical resistance, flame retardancy, weather resistance and heat resistance and particularly excellent in abrasion resistance and durability and a pretreatment using a laser beam surface treatment apparatus The present invention relates to a protective coating method for steel structures,

Generally, there is a painting method that forms a protective film on the surface of a structure by repairing a structure and extending the service life and the service life of the structure to secure safety and economical efficiency. In general, It is difficult to meet special performances together with the performance.

In addition, conventional techniques emphasize only the chemical resistance such as acid resistance, alkali resistance, and salt water resistance, and do not converge the expansion rate of the structure due to the change of the climatic (temperature), resulting in cracking and delamination of the coating film. Compared with concrete structures, steel (bridge) structures are subject to vibration due to their large vibration, which is affected by the adhesion of the coatings to the steel structure and the surface to be coated. In addition, the surface protective material of conventional paints sharply changes in gloss and mechanical properties, and the resin in the coating film does not sufficiently fill the interstitial space of the pigment. That is, it does not have a structure capable of sufficiently filling voids between the pigment particles in the coating layer.

 The conventional coating method is mainly composed of an organic-based paint such as an epoxy-based paint, an urethane-based paint and an acrylic-based resin paint. In the case of a paint made of an organic-based paint, the paint has an advantage of good workability and excellent adhesiveness and flexibility. The organic material easily deteriorates due to ultraviolet rays, ozone or moisture, resulting in reduced durability, low heat resistance, and contamination with contamination of organic materials such as oil.

In addition, paints made of water-based acrylics, styrene-butadiene rubber (SBR) latexes, polyacryl-urethane, etc. can work under certain wetting conditions and can bond with cement. (Tensile strength, tearing strength) of the coating film itself has been limited, and it has been widely used in areas where degradation environment and durability are required. Organic coating films have been used.

On the other hand, in the case of existing coating method for re-coating of steel structures, surface treatment requires removal of all foreign materials having a surface area of 95% or more, which can cause traffic congestion in urban areas and environmental problems in coastal and mountainous areas. In addition, in the case of the existing painting method, there is a problem in that the structural stability such as cracks is deteriorated after the construction because the structure capable of absorbing the impact is not shown when the external load is applied.

Korean Patent No. 10-1816590 (issued on January 09, 2018) Korean Patent No. 10-1742066 (issued on June 01, 2017)

A problem to be solved by the present invention is to provide a steel coating composition excellent in strength, durability, wear resistance, tensile strength and durability using a modified filler excellent in mechanical properties and durability and a performance modifier excellent in elasticity, adhesion, acid resistance, heat resistance and durability .

 The present invention has abrasion resistance, tensile strength, and durability that do not cause the release of heavy metals harmful to human or environment. By using a laser beam surface treatment device, it is possible to minimize dust and foreign matter scattering, The present invention also provides a protective coating method for a steel structure including a pretreatment process using a laser beam surface treatment apparatus.

The steel coating composition of the present invention comprises 1 to 45% by weight of a modifying filler and 55 to 99% by weight of a performance modifier, wherein the modifying filler comprises 15 to 98% by weight of heavy calcium carbonate, 1 to 30% 0.1 to 20% by weight of beryllium oxide, 0.1 to 20% by weight of boron nitride, 0.01 to 15% by weight of chromium oxide, 0.01 to 10% by weight of carbon fiber ash and 0.001 to 5% by weight of graphene, By weight of the performance modifier, from 40 to 99% by weight of a high solids content epoxy, from 0.1 to 30% by weight of a styrene-methacrylate-butadiene copolymer, from 0.1 to 25% by weight of a fluorinated polyester, 0.01 to 10 wt% of polybenzimidazole, 0.01 to 10 wt% of alginic acid propylene oxide, 0.01 to 10 wt% of octadecyltriethoxysilane, and 0.01 to 10 wt% of stearyl alcohol.

Wherein the performance modifier is selected from the group consisting of 0.1 to 40 wt% of a curing accelerator based on the weight of the performance modifier, 0.1 to 25 wt% of a reaction initiator, 0.01 to 15 wt% of dioctyl sebacate, 0.01 to 15 wt% of a pigment, And may further include one or more.

The protective coating method for a steel structure according to the present invention includes the steps of removing rust, foreign matter, and the like of a steel structure using a laser beam surface treatment apparatus; Applying a groove, a scratch, or the like of the removed portion with a putty material and treating the ground surface so as to be flat; Forming a primer layer on the treated substrate; Applying and curing the steel coating composition on the primer layer; And applying the surface protective / reinforcing coating composition after curing.

At this time, it is preferable to use an epoxy rust preventive paint as the primer in the step of forming the primer layer. Also, the surface protective / reinforcing coating composition applied on the upper side of the steel coating composition is composed of a mixture of a subject and a curing agent in a weight ratio of 1: 0.01-0.3, and the subject is styrene-methyl methacrylate-butyl acrylate A polyvinylidene chloride-vinyl chloride copolymer, 0.01 to 20 wt% of polyvinylidene chloride, 0.01 to 20 wt% of polybenzimidazole, 0.01 to 20 wt% of stearyl alcohol, 0.01 to 20% by weight of fine ceramics, 0.01 to 20% by weight of molybdenum, 0.01 to 20% by weight of beryllium oxide, 0.01 to 15% by weight of chromium oxide, 0.01 to 15% by weight of calcium gluconate, 0.01 to 15% To 5% by weight. The isocyanate-based curing agent is preferably used as the curing agent. Examples of the isocyanate curing agent include any of hexamethylene diisocyanate, isophorone diisocyanate, 2,4,4-trimethylhexamethylene isocyanate, xylene diisocyanate, toluene diisocyanate, 4,4'-diphenylmethane isocyanate and phenyl isocyanate Or more can be selected and used.

According to the present invention, it is possible to prevent the corrosion of steel structure such as steel structure, road structure, bridge, steel plate, steel bridge, . That is, according to the steel coating composition composition having excellent tensile strength, elongation, and durability of the present invention, it is possible to prevent cracks from being easily peeled off from the surface or peeled off easily from the surface due to excellent adhesion with steel structures, It is possible to improve the durability of the steel structure by blocking the corrosion, ultraviolet rays and other deterioration factors of the steel structure.

According to the present invention, by using the laser beam surface treatment apparatus, it is possible to minimize dust, foreign matter scattering, and the like, which are generated when conventional blast is used, and to completely remove all foreign substances, thereby preventing traffic congestion and environmental problems.

1 is a sequential view showing a protective coating method of a steel structure according to the present invention.
2 is a view showing an embodiment of a laser beam surface treatment apparatus applied to a protective coating method of a steel structure according to the present invention.
3 is a view showing another embodiment of a laser beam surface treatment apparatus applied to a protective coating method of a steel structure according to the present invention.

Hereinafter, preferred embodiments according to the present invention will be described in detail. However, it will be understood by those skilled in the art that the following embodiments are provided so that those skilled in the art will be able to fully understand the present invention, and that various changes and modifications may be made without departing from the scope of the present invention. It is not.

The steel coating composition of the present invention comprises 1 to 45% by weight of a modifying filler and 55 to 99% by weight of a performance modifier.

 The modified filler is characterized by containing 15 to 98 wt% of heavy calcium carbonate, 1 to 30 wt% of pine ceramics, 0.1 to 20 wt% of beryllium oxide 0.1 to 20% by weight of boron nitride, 0.01 to 15% by weight of chromium oxide, 0.01 to 10% by weight of carbon fiber ash and 0.001 to 5% by weight of graphene.

The above ground calcium carbonate is used for improving strength, filling property, impact resistance and the like. Heavy calcium carbonate is calcium carbonate produced by physically crushing and classifying white crystalline coal ash, which is sometimes referred to as white calcium carbonate because of its high whiteness. The heavy calcium carbonate is preferably contained in an amount of 15 to 98% by weight based on the modified filler, and when the content of the heavy calcium carbonate exceeds 98% by weight, the performance is improved but the workability is deteriorated and the content of the heavy calcium carbonate If the content is less than 15% by weight, the workability is improved but the effect of improving the performance may be weak.

The fine ceramics are used to improve strength, abrasion resistance, heat resistance, impact resistance and corrosion resistance. The fine ceramics are preferably contained in an amount of 1 to 30% by weight based on the modified filler. If the content of the fine ceramics exceeds 30% by weight, the performance may be improved but the workability may be deteriorated. If it is less than 1% by weight, the workability is improved but the effect of improving the performance may be weak.

The beryllium oxide is used for improving abrasion resistance, corrosion resistance and heat resistance. The beryllium oxide is preferably contained in an amount of 0.1 to 20% by weight based on the modified filler. When the content of the beryllium oxide exceeds 20% by weight, the performance is improved but the workability and strength may be lowered. If the content is less than 0.1 wt%, the effect of improving the performance may be weak.

The boron nitride can be used to improve heat resistance, impact resistance and corrosion resistance. The boron nitride is preferably contained in an amount of 0.1 to 20% by weight based on the modified filler. When the content of the boron nitride is less than 0.1% by weight, the effect of improving heat resistance, impact resistance and corrosion resistance may be insignificant. If the content of the boron nitride is less than 0.1% by weight, If it exceeds 20% by weight, the workability is lowered and the manufacturing cost is increased, which is not economical.

The chromium oxide is used for improving abrasion resistance, heat resistance, and rust prevention effect. The chromium oxide is preferably contained in an amount of 0.01 to 15% by weight based on the modified filler. If the content of the chromium oxide is less than 0.01% by weight, the abrasion resistance, the heat resistance, and the rust prevention effect may be insignificant, and if the content of the chromium oxide is less than 10% by weight, the abrasion resistance, heat resistance, The performance is improved but the economical efficiency is lowered.

The carbon fiber ash is used for improving the flexural toughness, elongation, bending resistance, fire resistance and abrasion resistance. The carbon fiber ash is preferably contained in an amount of 0.01 to 10 wt% based on the modified filler. When the weight ratio of the carbon fiber ash is increased, the flexural toughness, the elongation, the bending resistance, the fire resistance and the abrasion resistance are excellent. When the content of the carbon fiber ash is less than 0.01 wt%, the performance improvement effect becomes insufficient. Is more than 10% by weight, the performance is improved but the viscosity is increased and the workability is lowered.

The graphene is a semimetallic material composed of a hexagonal honeycomb arrangement of carbon atoms in a two-dimensional sp ² bond and having a thickness of one atom. The graphene is not only stable structurally and chemically, but also has excellent mechanical properties It has outstanding electrical and thermal conductivity characteristics. Also, the graphene powder has a specific surface area of 2,000 ~ 3,000 m ² / g, which is very wide, has excellent tensile strength of about 100 times of iron, and high airtightness to block hydrogen and helium elements. The graphene is used to improve the strength, particularly the flexural and tensile strength by reducing the water-cement ratio, and to improve the durability such as waterproofness, corrosion resistance and abrasion resistance. The graphene is preferably contained in an amount of 0.001 to 5 wt% with respect to the modified filler. If the content of the graphene is less than 0.001 wt%, the performance improving effect is deteriorated. If the graphene content exceeds 5 wt%, the performance is improved but the workability and economy are deteriorated.

The performance modifier is preferably contained in an amount of 55 to 99 wt% based on the steel coating composition. If the content of the performance modifier is more than 99% by weight, the viscosity of the performance modifier may be lowered and the material may be separated and the price competitiveness may be deteriorated. If the content of the performance modifier is less than 55% by weight, flexural toughness, elongation, , Corrosion resistance, heat resistance, and durability improvement may be weak.

Wherein the performance modifier comprises, based on the performance modifier, 40 to 99 wt.% Of a high solids epoxy, 0.1 to 30 wt.% Of a styrene-methacrylate-butadiene copolymer, 0.1 to 25 wt.% Of a fluorinated polyester, 0.01 to 10 wt% of polybenzimidazole, 0.01 to 10 wt% of alginic acid propylene oxide, 0.01 to 10 wt% of octadecyltriethoxysilane, and 0.01 to 10 wt% of stearyl alcohol.

The high solids epoxy (e.g., an epoxy containing 70% or more solids) is used to improve strength and adhesion. When the content of the high solid epoxy resin is less than 40% by weight, the effect of improving the bonding strength, adhesion strength and durability of the inorganic materials is weak. On the other hand, When the content of the solid epoxy resin is more than 99% by weight, it is difficult to expect further improvement in adhesion and durability.

The styrene-methacrylate-butadiene copolymer is used to improve strength and durability. The styrene-methacrylate-butadiene copolymer is preferably contained in an amount of 0.1 to 30% by weight based on the performance modifier. When the content of the styrene-methacrylate-butadiene copolymer is less than 30% by weight, Strength and durability of the styrene-methacrylate-butadiene copolymer is insufficient. When the content of the styrene-methacrylate-butadiene copolymer is more than 30% by weight, the performance is improved but the viscosity is lowered and the material separation is liable to occur.

The fluorinated polyester or fluorinated polyester is used for improving the solvent resistance, oil resistance, cold resistance, heat resistance and the like. It is preferable that the fluorinated polyester is mixed with the performance modifier in an amount of 0.1 to 25% by weight. When the content of the fluorinated polyester exceeds 25% by weight, the performance is improved but the workability is lowered and the fluorinated If the content of the polyester is less than 0.1% by weight, the effect of improving the performance may be weak.

The methyl cyanoacrylate is used to improve the adhesion of the composition. The content of the methyl cyanoacrylate is preferably 0.01 to 15% by weight based on the performance modifier. If the content of the methyl cyanoacrylate exceeds 15% by weight, the performance is improved but the curing time is shortened, If the content of the methylcyanoacrylate is less than 0.01% by weight, the effect of improving the performance may be insignificant.

The polybenzimidazole is used to improve the corrosion resistance, solvent resistance, heat resistance and electrical properties of the composition. It is preferable that the polybenzimidazole is incorporated in the performance modifier in an amount of 0.01 to 10 wt%. When the content of the polybenzimidazole exceeds 10 wt%, the performance is improved but the material is easily separated, If the content of imidazole is less than 0.01% by weight, the effect of improving the performance may be insignificant.

The alginic acid propylene oxide is used to increase viscosity control and adhesion. The alginic acid propylene oxide is preferably contained in an amount of 0.01 to 10% by weight based on the performance modifier. If the content of the alginic acid propylene oxide exceeds 10% by weight, the performance may be improved but the viscosity may be increased, When the content of propylene oxide alginate is less than 0.01% by weight, the workability is improved but the effect of improving the material separation and adhesion may be weak.

The octadecyltriethoxysilane is used to improve the reactivity and durability. The octadecyltriethoxysilane is preferably contained in an amount of 0.01 to 10% by weight based on the performance modifier. If the content of the octadecyltriethoxysilane exceeds 10% by weight, performance may be improved but price competitiveness may be deteriorated. If the content of the octadecyltriethoxysilane is less than 0.01% by weight, the effect of improving durability may be weak.

The stearyl alcohol is used to improve dispersibility, abrasion resistance and rust prevention effect. The stearyl alcohol is preferably contained in an amount of 0.01 to 10% by weight based on the performance modifier. If the content of the stearyl alcohol exceeds 10% by weight, the performance may be improved but price competitiveness may be deteriorated. When the content is less than 0.01% by weight, the effect of improving the performance may be weak.

The performance modifier may further comprise a curing accelerator. As the curing accelerator, any one selected from polyethylene polyamine, tetraethylenepentamine, and polyamidoamine may be used. The curing accelerator is preferably contained in an amount of 0.1 to 40% by weight based on the performance modifier. If the content of the curing accelerator is less than 0.1% by weight, the reaction rate is lowered and the curing time is delayed. If the content of the curing accelerator exceeds 40% by weight, the curing time is increased and the workability may be lowered.

The performance modifier may further include a reaction initiator as an example. The reaction initiator may be at least one selected from the group consisting of benzoyl peroxide, acetyl peroxide, dilauryl peroxide, di-tert-butyl peroxide, cumyl hydroperoxide, azobisisobutyronitrile, hydrogen peroxide and potassium persulfate And 0.1 to 25% by weight based on the performance modifier. When the content of the reaction initiator is more than 25 wt%, the reaction rate is increased and the workability is lowered. When the content of the reaction initiator is less than 0.1 wt%, the reaction rate is lowered and the performance development effect is lowered.

The performance modifier may further comprise dioctyl sebacate. The dioctyl sebacate is used for improving ductility, weatherability, heat resistance, cold resistance and the like. The dioctyl sebacate is preferably contained in an amount of 0.01 to 15% by weight based on the performance modifier. If the dioctyl sebacate content exceeds 15% by weight, the ductility may become strong and abrasion resistance and impact resistance may be deteriorated. If the dioctyl sebacate content is less than 0.01% by weight, the effect of imparting ductility, weather resistance, heat resistance and cold resistance is weak .

The performance modifier may further comprise a pigment. 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 fine ceramics. The pigment is preferably contained in an amount of 0.01 to 15% by weight based on the performance modifier.

The performance modifier may further include a defoaming agent for removing bubbles to increase strength and durability. The antifoaming agent is used to remove bubbles in the performance modifier to increase strength and durability. In addition, when the antifoaming agent is added to the performance modifier, the air entraining effect can be imparted to improve workability and pot life. The antifoaming agent is preferably contained in an amount of 0.01 to 10% by weight based on the performance modifier. Examples of the defoaming agent include alcohol defoaming agents, silicone defoaming agents, fatty acid defoaming agents, oil defoaming agents, ester defoaming agents and oxyalkylene defoaming agents. Examples of the silicone defoaming agent include dimethyl silicone oil, polyorganosiloxane, and fluorosilicone oil. Examples of the fatty acid defoaming agent include stearic acid and oleic acid. Examples of the oil-based antifoaming agents include kerosene, animal and plant oil, and castor oil. Examples of the ester type antifoaming agents include solitol trioleate, glycerol monoricinolate, and the like. Examples of the oxyalkylene antifoaming agents include polyoxyalkylene, acetylene ethers, polyoxyalkylene diisocyanate esters, and polyoxyalkylene alkylamines. Examples of the alcohol-based defoaming agent include glycol.

Meanwhile, the present invention proposes a surface protective / reinforcing coating composition for improving weather resistance, stain resistance, ultraviolet resistance and the like.

The surface protective / reinforcing coating composition comprises a mixture of a subject and a curing agent in a weight ratio of 1: 0.01 to 0.3, and the subject is a styrene-methyl methacrylate-butyl acrylate copolymer A polyvinylidene chloride-vinyl chloride copolymer, 0.01 to 20 wt% of polyvinylidene chloride, 0.01 to 20 wt% of polybenzimidazole, 0.01 to 20 wt% of stearyl alcohol, 0.01 to 20 wt% of molybdenum, 0.01 to 20 wt% of beryllium oxide, 0.01 to 20 wt% of chromium oxide, 0.01 to 15 wt% of calcium gluconate, 0.01 to 15 wt% of pigment and 0.001 to 5 wt% By weight.

The styrene-methyl methacrylate-butyl acrylate copolymer is used for improving strength and durability. The styrene-methyl methacrylate-butyl acrylate copolymer is preferably contained in an amount of 25 to 98% by weight based on the surface protective / reinforcing coating composition. When the content of the styrene-methyl methacrylate-butyl acrylate copolymer is When the amount of the styrene-methyl methacrylate-butyl acrylate copolymer is more than 98% by weight, the strength and durability of the composition are improved. It is difficult to expect the effect.

The polyester glycol is used for improving durability such as tensile strength, elasticity, abrasion resistance, heat resistance, chemical resistance and the like. When the content of the polyester glycol is more than 50% by weight, the performance is improved but the viscosity is increased, so that the workability and the workability are improved. If the content of the polyester glycol is less than 1% by weight, the effect of improving durability and strength may be weak.

The polyvinylidene-vinyl chloride copolymer is used for improving weather resistance, stain resistance, durability and the like. When the content of the polyvinylidene-vinyl chloride copolymer exceeds 20% by weight, it is preferable that the polyvinylidene-vinyl chloride copolymer has a performance But the workability is lowered. If the content of the polyvinylidene-vinyl chloride copolymer is less than 0.01% by weight, the effect of improving the strength and durability may be weak.

The polybenzimidazole is used to improve strength, adhesive strength, and heat resistance. The content of the polybenzimidazole is preferably 0.01 to 20% by weight based on the surface protective / reinforcing coating composition. When the content of the polybenzimidazole exceeds 20% by weight, the performance is improved, If the content of the polybenzimidazole is less than 0.01% by weight, the performance improving effect is insufficient.

The stearyl alcohol is used to improve dispersibility, abrasion resistance and rust prevention effect. The stearyl alcohol is preferably contained in an amount of 0.01 to 20% by weight based on the surface protective / reinforcing coating composition. If the content of the stearyl alcohol exceeds 20% by weight, the performance is improved. However, If the content of the stearyl alcohol is less than 0.01% by weight, the performance improving effect is insufficient and the workability is lowered.

The fine ceramics are used to improve strength, abrasion resistance, heat resistance, impact resistance and corrosion resistance. The fine ceramics are preferably contained in an amount of 0.01 to 20% by weight based on the surface protective / reinforcing coating composition. If the content of the fine ceramics exceeds 20% by weight, the performance may be improved but the workability may be deteriorated. If the content of the ceramic is less than 0.01% by weight, the workability is improved but the effect of improving the performance may be weak.

The molybdenum is used for improving strength, abrasion resistance, corrosion resistance, heat resistance, durability and the like. The molybdenum comprises 0.01 to 20% by weight based on the surface protective coating composition. If the content of the molybdenum exceeds 20% by weight, the performance improvement effect is obvious but the material separation is likely to occur. If the content is less than 0.01% by weight, the performance improvement effect is deteriorated.

The beryllium oxide is used for improving abrasion resistance, corrosion resistance and heat resistance. The beryllium oxide is preferably contained in an amount of 0.01 to 20% by weight based on the surface protective coating composition, and when the content of the beryllium oxide exceeds 20% by weight, the performance is improved but the workability and strength may be deteriorated. If the content of beryllium oxide is less than 0.01% by weight, the effect of improving performance may be weak.

The chromium oxide is used for improving abrasion resistance, heat resistance, and rust prevention effect. The chromium oxide is preferably contained in an amount of 0.01 to 15% by weight based on the surface protective coating composition. If the content of the chromium oxide is less than 0.01% by weight, the abrasion resistance, the heat resistance, and the rust prevention effect may be insignificant, and if the content of the chromium oxide is less than 10% by weight, the abrasion resistance, heat resistance, The performance is improved but the economical efficiency is lowered.

The calcium gluconate is used for improving strength, corrosion resistance and waterproofness. The calcium gluconate is preferably contained in an amount of 0.01 to 15% by weight based on the surface protective coating composition. When the content of the calcium gluconate exceeds 15% by weight, the performance is improved but the workability may be deteriorated. If the content of calcium carbonate is less than 0.01% by weight, the effect of improving the performance may be insignificant.

The pigment is used to improve the appearance by imparting hue. The pigment may be made of at least one material selected from fine ceramics, titanium dioxide, red iron oxide, yellow iron oxide, chromium oxide (Cr ₂ O ₃ ), purple iron oxide, black iron oxide, carbon black and fine ceramics. The pigment is preferably contained in an amount of 0.01 to 15% by weight based on the surface protective coating composition.

The graphene is a semimetallic material composed of a hexagonal honeycomb arrangement of carbon atoms in a two-dimensional sp ² bond and having a thickness of one atom. The graphene is not only stable structurally and chemically, but also has excellent mechanical properties It has outstanding electrical and thermal conductivity characteristics. Also, the graphene powder has a specific surface area of 2,000 ~ 3,000 m ² / g, which is very wide, has excellent tensile strength of about 100 times of iron, and high airtightness to block hydrogen and helium elements. The graphene is used to improve the strength, particularly the flexural and tensile strength by reducing the water-cement ratio, and to improve the durability such as waterproofness, corrosion resistance and abrasion resistance. The graphene is preferably contained in an amount of 0.001 to 5% by weight based on the surface protective coating composition. If the content of the graphene is less than 0.001 wt%, the performance improving effect is deteriorated. If the graphene content exceeds 5 wt%, the performance is improved but the workability and economy are deteriorated.

It is preferable that the curing agent is an isocyanate curing agent. Examples of the isocyanate curing agent include any of hexamethylene diisocyanate, isophorone diisocyanate, 2,4,4-trimethylhexamethylene isocyanate, xylene diisocyanate, toluene diisocyanate, 4,4'-diphenylmethane isocyanate and phenyl isocyanate Or more can be selected and used.

Hereinafter, the steel coating composition and the method of preparing the surface protective coating composition according to the preferred embodiment of the present invention will be described.

The steel coating composition according to a preferred embodiment of the present invention is prepared by mixing 1 to 45% by weight of a modifying filler and 55 to 99% by weight of a performance modifier with a forced mixer or a continuous mixer for a predetermined time (for example, 1 to 10 minutes) can do.

A surface protective coating composition according to a preferred embodiment of the present invention comprises 25 to 98% by weight of a styrene-methyl methacrylate-butyl acrylate copolymer, 1 to 50% by weight of a polyester glycol, 0.01 to 5% by weight of a polyvinylidene- 0.01 to 20 wt% of polybenzimidazole, 0.01 to 20 wt% of stearyl alcohol, 0.01 to 20 wt% of fine ceramics, 0.01 to 20 wt% of molybdenum, 0.01 to 20 wt% of beryllium oxide, 0.01 to 20 wt% of chromium oxide, (For example, 2 to 30 minutes) with a forced mixer or a continuous mixer, and then mixing the resulting mixture at a predetermined ratio (for example, 1 to 15% by weight, calcium gluconate 0.01 to 15% can do.

Hereinafter, a surface protection method of a steel structure using the steel coating composition or the like is described.

Steel structures are used to mean all structures made of steel such as bridges, steel bridges, laminates, and road facilities.

According to a preferred embodiment of the present invention, there is provided a surface protection method for a steel structure, comprising: removing rust, foreign matter, and the like from a steel structure using a laser beam surface treatment apparatus; Applying a groove, a scratch, or the like of the removed portion with a putty material and treating the ground surface so as to be flat; Forming a primer layer on the treated substrate; Applying and curing the steel coating composition on the primer layer; And applying a surface protecting / reinforcing coating composition for improving UV resistance, stain resistance, weather resistance, chemical resistance, flame retardancy, etc. after curing.

In this case, the putty material is made of a material having elasticity such as polyacryl-urethane or epoxy resin to repair such a crack or microcrack when microcracks due to expansion and contraction of a steel structure occur, can do.

A laser beam surface treatment apparatus 10 for removing rust and foreign matter from a steel structure comprises a main body 11 having a light guide passage 12 provided with a light guide passage mounting groove 12a, A light source 13 mounted at a lower portion of the light guide passage 12 for condensing a laser beam emitted from the light source 13, a light source 13 mounted to the light guide 13 and adapted to irradiate a laser beam in a downward direction using the light guide passage 12, And a lens adjusting means 15 mounted on the light guide passage mounting groove 12a and coupled with the lens module 14 so that the lens module 14 adjusts the height of the lens module 14 .

That is, the laser beam surface treatment apparatus 10 includes a main body 11 and a lens module 14 for condensing the laser beam irradiated from the light source 13 and the laser beam, And the like.

At this time, the laser beam surface treatment apparatus 10 smoothly moves along the steel structure in a horizontal direction through a known transferring or conveying means, and the shape of the laser beam surface treatment apparatus 10 can be formed into various shapes have.

The lens adjusting means 15 adjusts the height of the lens module 14 according to the condition of rust and foreign matter of the steel structure according to the condition of rust and foreign matter of the steel structure, .

The lens adjusting means 15 includes a lens 15a coupled to the lens module 14, a pinion 15b engaged with the lens 15a, a driving motor 15c rotating the pinion 15b, And a distance detection sensor 15d mounted on upper and lower ends of the rack 15a, respectively.

That is, when the height of the lens module 14 is set according to the condition of the rust, foreign matter, etc. of the steel structure, the lens adjusting unit 15 operates the driving motor 15c and the driving motor 15c The pinion 15b is rotated and operated to lift or lower the rak 15a to which the lens module 14 is coupled.

At this time, the distance sensor 15d mounted on the upper and lower ends of the rack 15a can accurately locate the lens module 14 at a designated position by checking the movement distance of the lens 15a.

Next, the main body 11 may be equipped with a dust collecting means 20 for collecting substances generated when rust and foreign matter of the steel structure are removed.

The dust collecting means 20 includes an inflow path 21 formed at a lower portion of the main body with an interval therebetween, an inhaler 22 mounted at an end of the inflow path 21, And a detection sensor 25 mounted on an inflow path 21 disposed in front of the dust collecting and collecting cylinder 24. The dust collecting and collecting cylinder 24 is installed in the lower part of the mesh net 23, do.

That is, the dust collecting means 20 operates in conjunction with the operation of the laser beam surface treatment apparatus 10 and sucks materials generated in the steel structure through the inflow path 21 during operation of the inhaler 22 And collected in the dust collecting container 24 by using the mesh net 23.

At this time, the sensing sensor 25 senses the material flowing through the inflow path 21, and transmits an anomaly indication error signal to the outside through a known alarm means.

In addition, foreign matter inlet blocking means 30 may be selectively installed on the outside of the dust collecting means 20 so as to prevent foreign matter from entering the inside thereof.

The foreign matter inflow and blocking means 30 includes a discharge path 31 formed at an upper portion of the main body and inclined toward the outside with a gap therebetween and an air blower 32 mounted on the discharge path 31.

That is, the foreign matter inflow / cut-off means 30 discharges the air generated during the operation of the blower 32 to the outside along the discharge path 31 to prevent the foreign matter from flowing into the inside.

Next, in the step of forming the primer layer, it is preferable to use an epoxy anticorrosive paint as the primer.

Hereinafter, embodiments of the steel coating composition according to the present invention will be more specifically described.

<Steel Coating Agent Composition>

&Lt; Example 1 >

25% by weight of a modifying filler and 75% by weight of a performance modifier were added and stirred for 2 minutes with a forced mixer to prepare a steel coating composition.

At this time, the modified filler is composed of 50 wt% of heavy calcium carbonate, 20 wt% of fine ceramics, 10 wt% of beryllium oxide, 10 wt% of boron nitride, 5 wt% of chromium oxide, 4 wt% And mixed.

The performance modifier comprises 88% by weight of high solids content epoxy, 1% by weight of styrene-methacrylate-butadiene copolymer, 1% by weight of fluorinated polyester, 1% by weight of methyl cyanoacrylate, 1% by weight of polybenzimidazole, 1 weight% of propylene oxide, 1 weight% of octadecyltriethoxysilane, 1 weight% of stearyl alcohol, 1 weight% of curing accelerator, 1 weight% of reaction initiator, 1 weight% of dioctyl sebacate, 1 weight% of pigment and 1 % By weight. Polyethylene polyamine was used as the curing accelerator. The reaction initiator used was benzoyl peroxide. Titanium dioxide was used as the pigment. The defoamer was a silicone defoamer.

&Lt; Example 2 >

25% by weight of a modifying filler and 75% by weight of a performance modifier were added and stirred for 2 minutes with a forced mixer to prepare a steel coating composition.

At this time, the modified filler is composed of 50 wt% of heavy calcium carbonate, 20 wt% of fine ceramics, 10 wt% of beryllium oxide, 10 wt% of boron nitride, 5 wt% of chromium oxide, 4 wt% And mixed.

The performance modifier comprises 81% by weight of high solids content epoxy, 2% by weight of styrene-methacrylate-butadiene copolymer, 2% by weight of fluorinated polyester, 2% by weight of methyl cyanoacrylate, 2% by weight of polybenzimidazole, 2% by weight of octadecyltriethoxysilane, 2% by weight of stearyl alcohol, 1% by weight of a curing accelerator, 1% by weight of a reaction initiator, 1% by weight of dioctyl sebacate, 1% % By weight. Polyethylene polyamine was used as the curing accelerator. The reaction initiator used was benzoyl peroxide. Titanium dioxide was used as the pigment. The defoamer was a silicone defoamer.

&Lt; Example 3 >

25% by weight of a modifying filler and 75% by weight of a performance modifier were added and stirred for 2 minutes with a forced mixer to prepare a steel coating composition.

At this time, the modified filler is composed of 50 wt% of heavy calcium carbonate, 20 wt% of fine ceramics, 10 wt% of beryllium oxide, 10 wt% of boron nitride, 5 wt% of chromium oxide, 4 wt% And mixed.

The performance modifier comprises 74% by weight of high solids epoxy, 3% by weight of styrene-methacrylate-butadiene copolymer, 3% by weight of fluorinated polyester, 3% by weight of methyl cyanoacrylate, 3% by weight of polybenzimidazole, 3 wt% of propylene oxide, 3 wt% of octadecyltriethoxysilane, 3 wt% of stearyl alcohol, 1 wt% of a curing accelerator, 1 wt% of a reaction initiator, 1 wt% of dioctyl sebacate, 1 wt% of a pigment, % By weight. Polyethylene polyamine was used as the curing accelerator. The reaction initiator used was benzoyl peroxide. Titanium dioxide was used as the pigment. The defoamer was a silicone defoamer.

In order to more easily grasp the characteristics of the first to third embodiments, Comparative Example 1 which can be compared with the embodiments of the present invention is shown.

&Lt; Comparative Example 1 &

25 wt% of heavy calcium carbonate and 75 wt% of high solids content epoxy were added and stirred for 2 minutes with a forced mixer to prepare a coating composition.

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

&Lt; Test Example 1 >

In order to compare the physical properties of the coating composition prepared in Examples 1 to 3 with the coating compositions prepared in Comparative Examples, the coating film was dried in a dry film state using a high solid epoxy resin coating (SPS-KIPC 5002-1755) (SPS-KIPC 5003-1756) was used to conduct the accelerated weathering test. The results of the tests were as follows: The results are shown in Table 1 below.

division Example 1 Example 2 Example 3 Comparative Example 1 The state of the dry film clear clear clear clear Condition in container clear clear clear clear Mixed (mixed) clear clear clear clear Weight (subject) 1.35 1.34 1.34 1.34 Lead (subject, KU) 93 93 93 92 Non-volatile matter (subject, weight%) 84 84 84 83 Drying time (curing, h, 25 캜) 9 9 9 10 Housekeeping time (mixing, h, 20 ° C) 6 6 6 5 Flowability (mixing, ㎛) 560 565 570 530 Volume Solids (%) 84 84 84 83 Promoting weatherability (300h, (%)) 95 96 97 92

As shown in Table 1, the performance of the steel coating composition prepared according to Examples 1 to 3 was superior to that of the coating composition prepared according to Comparative Example 1.

&Lt; Surface protective coating composition >

<Example 4>

The surface protective coating composition was mixed with the base and the curing agent in a weight ratio of 1: 0.2. At this time, the subject was a mixture of 76 wt% of styrene-methyl methacrylate-butyl acrylate copolymer, 3 wt% of polyester glycol, 3 wt% of polyvinylidene-vinyl chloride copolymer, 3 wt% of polybenzimidazole, A curing agent is added to 3% by weight of fine ceramics, 2% by weight of fine ceramics, 2% by weight of molybdenum, 2% by weight of beryllium oxide, 2% by weight of chromium oxide, 2% by weight of calcium gluconate, 1% And the mixture was stirred in a mechanical mixer for 5 minutes to prepare a surface protective coating composition. At this time, isophorone isocyanate was used as a curing agent.

&Lt; Example 5 >

The surface protective coating composition was mixed with the base and the curing agent in a weight ratio of 1: 0.2. At this time, the subject was a mixture of 68 wt% of styrene-methyl methacrylate-butyl acrylate copolymer, 5 wt% of polyester glycol, 5 wt% of polyvinylidene-vinyl chloride copolymer, 5 wt% of polybenzimidazole, A curing agent was added to 5 wt% of alcohol, 2 wt% of fine ceramics, 2 wt% of molybdenum, 2 wt% of beryllium oxide, 2 wt% of chromium oxide, 2 wt% of calcium gluconate, 1 wt% of pigment and 1 wt% And the mixture was stirred in a forced mixer for 5 minutes to prepare a surface protective coating composition. At this time, isophorone isocyanate was used as a curing agent.

&Lt; Example 6 >

The surface protective coating composition was mixed with the base and the curing agent in a weight ratio of 1: 0.2. At this time, the subject was a mixture of 60% by weight of styrene-methyl methacrylate-butyl acrylate copolymer, 7% by weight of polyester glycol, 7% by weight of polyvinylidene-vinyl chloride copolymer, 7% by weight of polybenzimidazole, A curing agent was added to 7 wt% of alcohol, 2 wt% of fine ceramics, 2 wt% of molybdenum, 2 wt% of beryllium oxide, 2 wt% of chromium oxide, 2 wt% of calcium gluconate, 1 wt% of pigment and 1 wt% And the mixture was stirred in a forced mixer for 5 minutes to prepare a surface protective coating composition. At this time, isophorone isocyanate was used as a curing agent.

&Lt; Test Example 2 &

To evaluate the physical properties of the surface protective coating composition prepared according to Examples 4 to 6, the prepared surface protective coating composition was applied on a dry film state by a ceramic-based urethane paint (SPS-KPIC 5010-1763) (White), alkali resistance, acid resistance and accelerated weathering resistance test were carried out in the same manner as in Example 1. The results are shown in Table 2 below.

division Quality standards Example 4 Example 5 Example 6 Dry film state No flow, wrinkles or pinholes clear clear clear Condition in container No lumps or condensation coating clear clear clear Non-volatile matter (subject, weight%) Over 50 54 54 54 Softening degree (Topic, N.S) 6 or more 7 7 7 Drying time (curing, h, 25 캜) Within 24 13 13 13 Flowability (mixing, ㎛) 175 or more 190 192 195 Concealment rate (white,%) over 90 93 94 94 Alkali resistance There should be no cracks, swelling, wrinkles, peeling, peeling, discoloration, etc. clear clear clear Acid resistance There should be no cracks, swelling, wrinkles, peeling, peeling, discoloration, etc. clear clear clear Accelerated weathering (300h,%) More than 80 88 89 90

As shown in Table 2, the surface protective coating compositions prepared according to Examples 4 to 6 had significantly higher performance than the standard.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, Modification is possible.

10: laser beam surface treatment apparatus 11:
12: light guide 13: light source
14: Lens module 15: Lens adjustment means
20: dust collecting means 21:
22: inhaler 23: mesh mesh
24: dust collecting container 25: detecting sensor
30: foreign matter inlet / outlet blocking means 31:
32: blower

Claims (9)

As a steel coating composition,
1 to 45% by weight of a modifying filler and 55 to 99% by weight of a performance modifier,
Wherein the modifying filler comprises 15 to 98 wt% of heavy calcium carbonate, 1 to 30 wt% of fine ceramics, 0.1 to 20 wt% of beryllium oxide, 0.1 to 20 wt% of boron nitride, 0.01 to 15 wt% of chromium oxide, 0.01 to 10% by weight of fiber ash and 0.001 to 5% by weight of graphene,
Wherein the performance modifier comprises 40 to 99% by weight of a high solids content epoxy, 0.1 to 30% by weight of a styrene-methacrylate-butadiene copolymer, 0.1 to 25% by weight of a fluorinated polyester, 0.01 to 15% by weight of an acrylate, 0.01 to 10% by weight of polybenzimidazole, 0.01 to 10% by weight of propylene alginate, 0.01 to 10% by weight of octadecyltriethoxysilane and 0.01 to 10%
&Lt; / RTI &gt;
The performance modifier of claim 1, wherein the performance modifier comprises 0.1 to 40% by weight of a curing accelerator based on the weight of the performance modifier, 0.1 to 25% by weight of a reaction initiator, 0.01 to 15% by weight of dioctyl sebacate, 0.01 to 15% And 10 wt%, based on the total weight of the steel coating composition.
A protective coating method for a steel structure using the coating composition according to claim 1 or 2,
Removing rust, foreign matter, and the like from the steel structure using a laser beam surface treatment apparatus;
Applying a groove or a scratch on the removed portion with a putty material and treating the surface to be flat;
Forming a primer layer on the treated substrate;
Applying and curing the steel coating composition on the primer layer; And
Applying the surface protective / reinforcing coating composition after curing
And a protective coating method for steel structures.
The method of claim 3,
Wherein the primer comprises an epoxy anticorrosive paint in the step of forming the primer layer.
The method of claim 3,
The surface protective / reinforcing coating composition applied on top of the steel coating composition is composed of a mixture of a subject and a curing agent in a weight ratio of 1: 0.01 to 0.3,
The above-mentioned subject matter includes 25 to 98% by weight of a styrene-methyl methacrylate-butyl acrylate copolymer, 1 to 50% by weight of a polyester glycol, 0.01 to 20% by weight of a polyvinylidene-vinyl chloride copolymer 0.01 to 20 wt% of polybenzimidazole, 0.01 to 20 wt% of stearyl alcohol, 0.01 to 20 wt% of fine ceramics, 0.01 to 20 wt% of molybdenum, 0.01 to 20 wt% of beryllium oxide, 0.01 to 15 wt% of chromium oxide 0.01 to 15% by weight of calcium gluconate, 0.01 to 15% by weight of pigment and 0.001 to 5% by weight of graphene.
6. The method of claim 5,
The curing agent may be at least one selected from the group consisting of hexamethylene diisocyanate, isophorone diisocyanate, 2,4,4-trimethylhexamethylene isocyanate, xylene diisocyanate, toluene diisocyanate, 4,4'diphenylmethane isocyanate and phenyl isocyanate. Wherein the curing agent is an isocyanate-based curing agent.
4. The laser beam surface treatment apparatus according to claim 3,
A light guide passage provided with a light guide passage mounting groove;
A light source mounted on an upper portion of the main body and irradiating a laser beam in a downward direction using the light guide;
A lens module mounted on a lower portion of the light guide and provided with a lens for condensing a laser beam emitted from the light source;
And lens adjusting means mounted in the light guide passage mounting groove and coupled to the lens module to adjust the height of the lens module,
Wherein the lens adjusting means includes a lens coupled to the lens module, a pinion engaged with the lens, a driving motor for rotating the pinion, and a distance sensor mounted on upper and lower ends of the lever, respectively. Protective Coating Method.
8. The method of claim 7,
The main body is provided with a dust collecting means for collecting the substances generated when the rust and foreign matter of the steel structure are removed,
Wherein a foreign matter inflow / outflow preventing means is selectively installed on the outside of the dust collecting means so as to prevent foreign matter from flowing into the inside of the dust collecting means.
9. The method of claim 8,
Wherein the dust collecting means comprises: an inflow path formed at a lower portion of the main body at an interval; An inhaler mounted at an end of the inflow path; A mesh net disposed in front of the inhaler; A dust collecting container installed at a lower portion of the mesh net; And a detection sensor mounted on an inflow path disposed in front of the dust collecting container,
The foreign matter inflow and shutoff means may include an exhaust passage formed at an upper portion of the main body so as to be inclined toward the outside with an interval therebetween; And a blower mounted on the upper portion of the discharge path.

Images