KR20200104771A - Coating Method using special Paint - Google Patents

Abstract

A steel plate coating method using special paint comprises the following steps: rust-preventing a steel plate with an anti-rust agent; applying a resin adhesive to the surface of the rust-prevented steel plate; painting a primer on the surface of the adhesive applied to the steel plate; and painting a heat exchange paint with the required amount of 0.2-0.3 kg per m^2 of the primer applied steel plate.

Description

Steel plate coating method using special paint{Coating Method using special Paint}

The present invention relates to a steel plate coating method using a special paint, and more particularly, to a steel plate coating method using a special paint having a waterproof and thermal insulation function by dispersing heat to the outside by painting the steel plate using a special paint.

In general, the steel plate painting method cleanly removes rust from the rust generated on the steel plate using a brush, and is treated with rust prevention using a rust inhibitor, arranges the plate, pickling, plating, calibration, and then painting. It is a reflective method of type heat shielding paint.

However, since the reflection method of the conventional general reflective heat shielding paint can obtain a heat shielding effect only when it is glossy or white or close to white color is used, the range of color selection is narrow, and it does not affect the reduction of radiant heat. There is. In addition, after painting the general reflective heat shielding paint on the roof and exterior walls of the building, the temperature of each part is lowered by an average of 2 ~ 3℃ compared to the general paint, and this is a problem that heating costs increase to reduce heating costs in winter. There was.

Accordingly, it is an object of the present invention to provide a method for coating a steel plate using a special paint capable of dispersing heat to the outside when the temperature is higher than a certain temperature and passing heat when the temperature is lower than a certain temperature to have waterproof and thermal insulation functions and extend the lifespan.

The steel plate coating method using a special paint for achieving the object of the present invention comprises the steps of: treating the steel plate with a rust inhibitor; Applying a resin adhesive to the surface of the iron plate treated with anti-rust treatment; Coating a primer on the surface of the adhesive applied to the iron plate; And coating a heat exchange paint with a required amount of 0.2 to 0.3 kg per square meter of the iron plate coated with the primer. By coating a heat exchange paint, heat is dissipated to the outside when the temperature is higher than a certain temperature, and heat is passed through when the temperature is lower than a certain temperature, so that it has both waterproof and thermal insulation functions, and the lifespan can be extended.

Here, the step of high pressure washing the surface of the iron plate with 3 ~ 4 Bar; Drying the washed iron plate; Restoring a gap in the steel plate; And waterproofing the urethane prepolymer with a polyurethane-based waterproofing agent composed of a main waterproofing agent and a curing agent in which a latent curing agent and a latent curing agent decomposition catalyst are added, wherein the waterproofing step comprises: a required amount of the polyurethane-based waterproofing agent per m2 Applying at 0.6kg and forming it to a thickness of 0.5mm, it is possible to create the optimal state of the steel plate for coating heat exchange paint, minimize material waste, increase work efficiency, and maximize the effect of usage. In particular, it is preferable because the curing time can be shortened to reduce the working period.

In addition, the rust inhibitor is an epoxy structure, and when a chelating ligand and a polyol are connected to the epoxy structure, unstable rust is captured by the chelate ligand, and stable chelated iron can be formed.

Here, the heat exchange paint is a copolymer of acrylic acid, methacrylic acid and styrene, 20 to 30% by weight of an acrylic emulsion resin formed by mixing a surfactant in the copolymer; It consists of ceramic powder and epoxy resin having a particle size of 1㎛ or less, the ceramic powder is 30 ~ 40% by weight, the epoxy resin is a water-soluble poly coated with a ceramic composition consisting of 10 ~ 20% by weight based on the ceramic powder. 5 to 15% by weight of urethane resin; 1 to 5% by weight of pigment; It converts heat energy absorbed at 25°C or higher into energy other than heat energy, and consists of a polymer material made of a hollow spherical thermoplastic resin plastic and a spherical inorganic material including titanium oxide surrounding the polymer material. 10 to 20 weight of a thermal energy exchanger that is made of spherical beads and is distributed evenly, and the polymer material performs heat exchange motion by a catalyst, and the inorganic material assists the heat exchange motion and prevents abrasion or deterioration of the coating film. %; 2 to 8% by weight of the insulating bead additive; 5-50% by weight of water; And 1 to 5% by weight of the additive for improving the properties can absorb solar heat, so when the surrounding temperature is high or low, solar heat can be absorbed and the ambient temperature may not be increased.

According to the present invention, by coating a heat exchange paint, heat is dissipated to the outside when the temperature is higher than a certain temperature, and when the temperature is lower than a certain temperature, heat is passed through it to have waterproof and heat insulation functions and extend the lifespan.

Figure 1 is a process diagram of a steel plate coating method using a special paint according to the present invention.

Hereinafter, a steel plate coating method using a special paint in a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

How to paint a rusty iron plate,

The surface of the iron plate is washed (S11). The cleaning process consists of high pressure (3~4bar) to remove foreign substances on the surface of the steel plate and remove excitement rust.

Dry the washed iron plate (S12).

The dried iron plate is treated with a rust inhibitor (S13). Anti-rust treatment is performed using a roller or spray. Construction is possible in the state of rust on the surface of the steel plate, thereby reducing the surface treatment labor cost by 30%. Anti-rust treatment should be applied appropriately so that there is no overcoat or flow phenomenon during one application due to the rapid curing speed. The rust inhibitor is an epoxy structure, and a chelate ligand and a polyol are connected to the epoxy structure.

A resin adhesive is applied to the surface of the rust-proofed steel plate (S14). Apply adhesive for bonding fiberglass. It improves the adhesion between the rust inhibitor coating and the fiberglass. It is preferable that the resin adhesive is selected in consideration of the chemical reaction with the rust inhibitor.

The gap in the steel plate is restored (S15). Surface rust occurs due to aging of the steel plate, and leaks occur because holes due to rust are generated. If the roof structure is a steel plate, leakage due to rust and bending of the steel plate is structurally inevitable. It is preferable that the restoration work be performed by a method that can prevent holes due to rust and leak points due to bending of the steel plate, in addition to rust removal and prevention of rust generation when repainting the steel plate surface. Fiberglass is used for restoration work. Fiberglass has flexibility and durability, and it is possible to protect the surface as well as waterproof by performing hole treatment and repair of warping parts at once, such as increasing adhesion due to increased surface area due to grid pattern work.

A primer is applied on the surface of the iron plate (S16). In the case of heat exchange paint to be applied as a finish coating, since it is water-based paint, a primer is used to improve between paints with different physical properties.

The urethane prepolymer is waterproofed with a polyurethane-based waterproofing agent composed of a main waterproofing agent and a curing agent to which a latent curing agent and a latent curing agent decomposition catalyst are added (S17).

The polyurethane-based waterproofing agent is composed of a two-component urethane resin composition, specifically composed of a main waterproofing agent and a curing agent, and water is used as the curing agent. The main waterproofing agent is made by adding a latent hardener and a latent hardener decomposition catalyst to the urethane prepolymer. Urethane prepolymer uses a polyisocyanate compound having two or more isocyanate groups per molecule and a polyol compound having two or more hydroxyl groups per molecule, and the blending ratio of the polyisocyanate compound and the polyol compound is calculated as NCO group/OH group (equivalent ratio). It is prepared by mixing about 1.2 to 2.5 and reacting at 50 to 130°C for 5 to 15 hours. The content of the isocyanate group (-NCO group) of the urethane prepolymer solution thus prepared is preferably adjusted to be 0.5 to 6.0% by weight of the total weight of the urethane prepolymer, thereby ensuring physical properties as a paint agent, and risk of release of free isocyanate compounds. Can be prevented. Latent curing agents are specifically, oxazolidine-based, ketimine-based, aldimine-based, and enamine-based latent curing agents, and among them, N-hydroxyoxyoxazolidine compounds having at least one osazolidine ring in the molecule It is good because it is excellent in terms of foaming resistance and storage stability. In addition, the optimal addition amount of the latent curing material is 0.5 to 5.0% by weight of the total weight of the urethane prepolymer, and within this range, the properties of the cured product of the urethane resin composition are maintained well. As the latent hardener decomposition catalyst, an organic acid or silyl ester is used, and the addition amount is preferably 0.1 to 3.0% by weight of the total weight of the urethane prepolymer.

As such, the reason for the use of the latent hardener decomposition catalyst in the main waterproofing agent is that when water is mixed with the hardener in the main body of an organic acid or silyl ester, the water present in the system reacts with the latent hardener contained in the main body, resulting in amines. It promotes the cleavage reaction, which is phosphoric acid decomposition that generates a group (-NH2) and a hydroxyl group (-OH), and the moisture present in the system reacts with the main isocyanate group (-NCO group) to form a urea bond. This is because it has the effect of preventing, suppressing foaming, and maintaining a balance between pot life and hardenability. In addition, in the waterproofing step, the polyurethane-based waterproofing agent composed of the above configuration is applied in an amount of 0.6 kg per square meter using a roller, brush, or spray, and formed to a thickness of 0.5 mm.

Heat-exchange paint is coated on the iron plate coated with the primer at a required amount of 0.2 to 0.3 kg per ㎡ of the iron plate (S18). The steel plate installed on the roof lowers the upper surface temperature to save internal cooling energy and reduces thermal expansion and contraction of the steel plate. A polyurethane-based waterproofing agent is applied in an amount of 0.6 kg per ㎡ and formed to a thickness of 0.5 mm.

The heat exchange paint is a copolymer of acrylic acid, methacrylic acid, and styrene, and is composed of 20 to 30% by weight of an acrylic emulsion resin formed by mixing a surfactant in the copolymer, a ceramic powder having a particle size of 1 μm or less, and an epoxy resin. It is 30 to 40% by weight, and the epoxy resin is 5 to 15% by weight of a water-soluble polyurethane resin coated with a ceramic composition consisting of 10 to 20% by weight based on the ceramic powder, 1 to 5% by weight of pigment, and heat energy absorbed at 25℃ or higher. Is converted into energy other than thermal energy, and is made of a polymer material made of a hollow spherical thermoplastic resin plastic and a spherical inorganic material including titanium oxide surrounding the polymer material, and is made of fine spherical beads. 10 to 20% by weight of a thermal energy exchanger and 2 to 8% by weight of a heat-insulating bead additive to prevent wear or deterioration of the coating film while being uniformly distributed and the polymeric material performs heat exchange movement by the catalyst and the inorganic material assists the heat exchange movement. , 5 to 50% by weight of water and 1 to 5% by weight of a property-improving additive.

Acrylic resin may be prepared as an acrylic emulsion resin (Acrylic emulsion resin). Acrylic emulsion resin is a copolymer of acrylic acid, methacrylic acid, and styrene, and is formed by mixing a surfactant with a copolymer. Acrylic emulsion resin has more transparency than glass and is only half the weight of glass, so it is light and excellent in processability, while its hardness is low, so it is easy to scratch and stick to dust. Acrylic emulsion resin is used in various fields such as windshield for aircraft and automobiles, white lighting equipment covers mixed with titanium bag, and building materials. As medical materials, most of contact lenses and dentures are made of this acrylic emulsion resin.

In addition, acrylic emulsion resins include polymers and hybrids of acrylic acid and acrylic acid methyl ester or ethyl ester. The polymer of methyl acrylate (C ₄ H ₆ O ₂ ) is used for resin processing of adhesives, paints and textiles, and is used to increase abrasion resistance or to remove gloss. The sodium salt of the acrylic acid polymer is a water-soluble polymer electrolyte and has a very high viscosity. It hardens immediately when acid is added, but dissolves when shaken well. The sodium salt of acrylic acid polymer is used as a basic material such as hair lotion and pomade for cosmetics, and its calcium salt is used as a soil conditioner.

The urethane resin may be made of a water soluble polyurethane resin. Water soluble polyurethane resin is a generic term for a polymer compound that has a urethane bond -OCONH- (NCO group) in its molecule. It is an elastic body in a rubbery state, such as urethane rubber, synthetic fiber, adhesive, paint, urethane foam, and automobile bumpers. Etc. Recently, the range of use is expanding. In general, it is produced by addition polymerization of diol (1,4-butanediol, etc.) and diisocyanate (diphenylmethane diisocyanate, etc.). For rubber applications, polyetherdiols such as polyethylene glycol and polypropylene glycol, or aliphatic polyesters of terminal diols are used as diols. The use of urethane foam is often made thermosetting by adding triisocyanate, but in the present invention, the water-soluble polyurethane resin is a thermoplastic resin polyurethane and a thermoplastic resin solubilized.

Through ceramic powder, the coating layer forms the uneven surface, and it has the advantage of protecting the coating layer and the object to be coated by emitting various active ingredients (neutralizing harmful gases, controlling humidity, etc.), and nano particle size (for example, 200 nm to 800 nm) Consists of In other words, particulate ceramic powder forms the surface of the coating layer into fine irregularities to prevent contamination by fine dust and decrease the adhesion of other adherents to prevent contamination of the surface of the object to be painted, and is easily and quickly removed even if the dirt adheres. . If the ceramic powder is mixed with less than 30% by weight of the urethane resin, the surface of the coating layer cannot be formed into irregularities and other efficacy is weak. If it exceeds 40% by weight, the function of the coating layer is weak because it cannot be harmonized with other materials. , Ceramics and other various materials can be used. Even if ceramic powder is used in a small particle size, it is coated on a three-dimensional urethane resin to perform the above-described function, that is, a urethane resin coated with a ceramic composition is used.

Ceramic powder can be broken or lost during handling (manufacturing and application of paint), and urethane resin does not cause any loss when handling compared to ceramic powder through an elastic material, and using these properties, a ceramic composition is coated on urethane resin. use. The epoxy of the ceramic composition is for bonding ceramic powder to the surface of the urethane resin, and a conventional epoxy can be used, and the urethane resin is immersed in the ceramic powder and epoxy mixture, and then cured (naturally cured, forced curing, etc.). A method of forming a coating layer or a method of spraying ceramic powder after applying epoxy to the surface of the urethane resin are possible. The mixing ratio of the ceramic powder and the epoxy is preferably 10 to 20% by weight of the epoxy based on 100 parts by weight of the ceramic powder. In other words, by coating the ceramic composition on the surface of the urethane resin, the ceramic powder can be used without loss even if the particles of the ceramic powder are small, and the effect of preventing static electricity is excellent even when using a small amount by increasing the surface area. It is protected and can be maintained for a long period of time.

The heat energy exchange agent is made of a polymer material made of a hollow spherical thermoplastic resin plastic and a spherical inorganic material surrounding the polymer material, and is made of fine spherical beads, and a number of them are uniformly distributed, and the polymer material is a catalyst. The heat exchange movement is performed by and inorganic materials assist the heat exchange movement to prevent abrasion or deterioration of the coating film.

The thermal energy exchanger converts solar thermal energy into energy other than thermal energy when it exceeds 25°C, and passes solar thermal energy at 25°C or less.

The thermal energy exchanger blocks ultraviolet rays by forming a coating film by heat exchange molecules.

Additives to improve properties, the thermal energy exchanger is coated around the titanium oxide.

Acrylic resins are usually referred to as acrylic resins for methacrylic acid resins obtained by polymerizing monomers containing methyl methacrylate as a main component, which are called acrylic resins in the plastic field. In the field of paints, acrylic resin as a binder refers to a resin obtained by copolymerizing a monomer containing an Acryl acid or Methacryl acid derivative as a main component. Therefore, there are polymers of methacrylic acid ester or acrylic acid ester in Acrylic Resin. As a resin material, methyl methacrylate asster is the most practical.

It is not a thermosetting resin, but a plastic with a similar three-dimensional structure. It is tough and resistant to chemicals. It is used for electrical insulators, structural materials, foam insulation, foam cushions, and elastic fibers, and is also used as a substitute for rubber because of its good elasticity.

Polyurethane is made by mixing two or more liquids. Like the polyol stream, it contains catalysts, surfactants, blowing agents, pigments and fillers. The two components are also referred to as polyurethane-based or simply systems. Isocyanates are generally referred to in North America as "B side" or simply "Iso". Mixing with polyols and other additives is generally referred to as "A side" or "poly". This mixture may also be referred to as "resin" or "resin blend". In Europe, the meanings of "A side" and "B side" are reversed. Resin mixing additives, chain extenders, crosslinking agents, surfactants, flame retardants, foaming agents, pigments, and fillers. Polyurethane can be produced in a variety of densities and hardnesses by changing isocyanates, polyols or additives.

Due to the steel plate coating method using the above special paint, heat dissipation to the outside when the temperature is higher than a certain temperature by coating the heat exchange paint, and passing heat when the temperature is less than a certain temperature, it has both waterproof and heat insulation functions, and the lifespan can be extended. have. It has the effect of creating the optimal state of the steel plate for coating heat exchange paint, minimizing material waste, increasing work efficiency, and maximizing the effect on the amount of use. In particular, it shortens the curing time to shorten the working period. Can be reduced. The rust inhibitor is an epoxy structure, and when a chelate ligand and a polyol are connected to the epoxy structure, unstable rust is caught by the chelate ligand, and stable chelated iron can be formed. Since it can absorb solar heat, when the surrounding temperature is high or low, the energy saving effect can be improved by absorbing solar heat and not raising the ambient temperature.

Claims (5)

In the steel plate coating method using special paint,
Rust-preventing the steel plate with a rust inhibitor;
Applying a resin adhesive to the surface of the iron plate treated with anti-rust treatment;
Coating a primer on the surface of the adhesive applied to the iron plate;
And coating a heat exchange paint in an amount of 0.2 to 0.3 kg per square meter of the iron plate coated with the primer.
The method of claim 1,
High-pressure washing of the surface of the iron plate with 3-4 Bar;
Drying the washed iron plate;
Restoring a gap in the steel plate; And
A method of coating a steel sheet using a special paint, further comprising the step of waterproofing a polyurethane-based waterproofing agent consisting of a main waterproofing agent and a curing agent in which a latent hardener and a latent hardener decomposition catalyst are added to the urethane prepolymer.
The method of claim 2,
The step of waterproofing,
The method of coating a steel plate using a special paint, characterized in that the polyurethane-based waterproofing agent is applied in an amount of 0.6 kg per ㎡ and formed to a thickness of 0.5 mm.
The method of claim 1,
The rust inhibitor is an epoxy structure, and a chelate ligand and a polyol are connected to the epoxy structure.
The method of claim 1,
The heat exchange paint,
20 to 30% by weight of an acrylic emulsion resin formed by mixing a surfactant in the copolymer as a copolymer of acrylic acid or methacrylic acid and styrene;
It consists of ceramic powder and epoxy resin having a particle size of 1㎛ or less, the ceramic powder is 30 ~ 40% by weight, the epoxy resin is a water-soluble poly coated with a ceramic composition consisting of 10 ~ 20% by weight of the ceramic powder. 5 to 15% by weight of urethane resin;
1 to 5% by weight of pigment;
It converts heat energy absorbed at 25℃ or higher into energy other than heat energy, and is made of a polymer material made of a hollow spherical thermoplastic resin plastic and a spherical inorganic material including titanium oxide surrounding the polymer material. 10 to 20 weight of a thermal energy exchanger that is made of spherical beads and is distributed evenly, and the polymer material performs heat exchange motion by a catalyst and the inorganic material assists the heat exchange motion and prevents abrasion or deterioration of the coating film. %;
2 to 8% by weight of the insulating bead additive;
5-50% by weight of water; And
Steel plate coating method using a special paint, characterized in that it contains 1 to 5% by weight of a property improvement additive.

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