KR102218328B1 - Uncombustible color steel sheet and method for manufacturing of the same - Google Patents

Abstract

One embodiment of the present invention relates to a non-flammable color steel sheet and a method of manufacturing the same.
Specifically, it is a non-flammable color steel sheet including an alloy plated steel sheet, a primer film positioned on one or both surfaces of the alloy plated steel plate, and a top coat film positioned on the surface of the primer film, and the top coat film is 100% by weight. On the other hand, the inorganic pigment solid content can provide a non-flammable color steel sheet containing 25.0 to 40.0% by weight.

Description

Non-flammable color steel sheet and its manufacturing method {UNCOMBUSTIBLE COLOR STEEL SHEET AND METHOD FOR MANUFACTURING OF THE SAME}

One embodiment of the present invention relates to a non-flammable color steel sheet and a method of manufacturing the same.

The demand for colored steel sheets is increasing for construction materials, home appliances, and automobile parts. On the other hand, color steel sheets applied as finishing materials for buildings have been reinforced in terms of flame retardant performance as the standards for fire prevention regulations on structural safety of buildings have been strengthened.

When constructing sandwich panels in warehouse buildings, the mandatory use range of non-combustible materials for finishing materials has been reinforced from '3000㎡ or more' to '600㎡ or more'. In addition, regulations are being established to strengthen the flame retardant performance standard for the ceiling structure of the piloti structure. Furthermore, it has been revised to extend the use of flame-retardant materials as a finishing material for exterior walls of buildings when installing a fire spread prevention structure from high-rise buildings to buildings with six stories or more.

In addition, a new bill related to the flame retardancy of colored steel sheets used as finishing materials for buildings has been newly established. Specifically, in the case of a composite material composed of a steel plate and a core material, the number of full-face painting on a hot-dip galvanized steel sheet for general use is two or more times, and the amount of plating is 180 g or more per square meter, and the thickness of the steel sheet is coated after plating.裝) A new bill has been established that requires it to be at least 0.5mm from the previous standard.

However, in the new legislation, as the thickness regulation that the coating thickness of color steel sheets must be 20㎛ or more for the purpose of preventing the spread of fire is omitted, not only the color implementation of color steel sheets but also the existing corrosion resistance, weather resistance, and other properties Technology to secure non-combustibility together has become important.

The necessity of non-combustible ceiling material in buildings from past fire accidents has become an increasingly important factor in preventing the spread of fire in buildings. There are various materials used for existing ceiling materials, but in recent years, metal ceiling materials are widely used in consideration of manufacturability and economy.

The non-flammable color metal ceiling material is made into a product through a powder coating process with a relatively thick coating film of about 60 µm ± 5 µm after plate-like processing (blanking) and shape processing in the shape of the ceiling material using aluminum, galvanized material, and cold rolled material. have.

Existing non-combustible metal ceiling materials perform the painting process as a post-processing process because the non-combustible paint contains a large amount of white pigment, and when the product is processed after painting, the coating film is peeled off due to cracks in the painting, causing problems in the product.

The general color coated steel sheet is a semi-incombustible material and is difficult to apply as a non-flammable colored ceiling material, so its use as a ceiling material is limited. In order to prevent the spread of fire of the ceiling material for construction, it is advantageous to use a non-combustible material to prevent the spread of fire. In order to secure non-flammability, color coated steel sheet optimizes the thickness of the material of the steel sheet, the type of paint, and the composition of the coating layer, and the surface hardness, film adhesion, moisture resistance, chemical resistance, acid resistance, alkali resistance, and boiling water resistance required for interior finishing materials for construction purposes. , It is necessary to secure corrosion resistance, heat resistance, stain resistance, and workability.

By controlling the thickness of the top coat including the pigment having a color as thin as possible, mass reduction and gas generation caused by combustion are suppressed. In addition, it is possible to minimize the flame during combustion by controlling the solid content in the top coat.

The non-flammable color steel sheet according to an embodiment of the present invention is a non-flammable color steel sheet comprising an alloy-plated steel sheet, a primer film positioned on one or both surfaces of the alloy plated steel sheet, and a top coat film positioned on the surface of the base coat film, The top coat may include inorganic pigment solids: 25.0 to 40.0% by weight based on 100% by weight of the total.

The thickness of the top coat may be 8 to 12 μm.

The thickness of the alloy plated steel sheet may be 0.3 to 0.9mm.

The thickness of the undercoat may be 1 to 5 μm.

The non-flammable color steel sheet may have a value of 1.3 to 3.1% according to the following relational formula 1.

[Relationship 1]

{(Top coat thickness (µm) + bottom coat thickness (µm))*10 ^-3 }/alloy plated steel sheet thickness (mm)*100

The color difference L* value of the top coat may be 83 or more.

The hiding rate of the top coat may be 80% or more.

In another embodiment of the present invention, a method of manufacturing a non-combustible color steel sheet includes: preparing an alloy-plated steel sheet, forming a base coat film using a composition for a base coat film on the surface of the alloy plated steel sheet, and a top coat on the surface of the base coat film. Including the step of forming a top coat film using the composition for coating film, the composition for the top coat film, based on the total 100% by weight, inorganic pigment solid content 25.0 to 40.0% by weight, silane 48.0 to 69.0% by weight, acidity control agent 0.01 to 1.0 It may contain weight %, 0.5 to 3.0 weight% of a thickener, 0.1 to 3.0 weight% of a matting agent, and the balance solvent.

In the step of forming a top coat film using the composition for a top coat film on the surface of the bottom coat film, the thickness of the top coat film may be in the range of 8 to 12 μm.

In preparing the alloy plated steel sheet, the alloy plated steel sheet having a thickness of 0.3 to 0.9 mm may be prepared.

In the step of forming a primer film using the composition for a primer film on the surface of the alloy-plated steel sheet, the thickness of the primer film may be in the range of 1 to 5 μm.

The non-flammable color steel sheet may have a value of 1.3 to 3.1% according to the following relational formula 1.

[Relationship 1]

{(Top coat thickness (µm) + bottom coat thickness (µm))*10 ^-3 }/alloy plated steel sheet thickness (mm)*100

With respect to the total 100% by weight of the composition for the primer coating, isocyanates (isocyanate) 10 to 40% by weight, polyols (Polyol) 1.5 to 5.0% by weight, crosslinking agent 0.1% by weight or less, and the remainder of the solvent may be included.

After the step of forming a top coat film using the composition for a top coat film on the surface of the bottom coat film, the step of processing the non-flammable color steel sheet on which the top coat film is formed may be further included.

In the non-combustible color steel sheet according to an embodiment of the present invention, by controlling the thickness of the top coat film as thin as possible, it is possible to minimize the emission of harmful gases by reducing the mass reduction generated by combustion. In addition, by implementing the desired color through the optimization of pigments and solids in the top coat, it is possible to minimize flames in case of fire.

In addition, the non-flammable color steel sheet according to an embodiment of the present invention is used to manufacture a non-flammable color steel sheet by controlling the thickness of the base and top coats in order to obtain properties that can be applied as a finishing material for construction to the coating composition of the base and top coats. It can also be commercialized.

1 shows a non-flammable color steel sheet according to an embodiment of the present invention.
2 is a photograph showing the appearance of non-flammable color steel sheets according to the Examples and Comparative Examples.
3 shows the results of measuring the thickness of upper and lower coats of non-flammable color steel sheets according to Examples and Comparative Examples.
4 is a cross-sectional view of a specimen that has been determined as a non-combustible material.
5 shows the results of a non-combustible material nonconformity test result of the specimen disclosed in FIG. 4.
6 shows a cross-section of a specimen that has been judged as suitable for an actual non-combustible material.
7 shows the results of a non-combustible material suitability test result of the specimen disclosed in FIG. 6.

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

Non-flammable color steel plate

The non-flammable color steel sheet according to the exemplary embodiment of the present invention may include an alloy plated steel plate, a primer film positioned on one or both surfaces of the alloy plated steel plate, and a top coat film positioned on the surface of the primer coat.

Specifically, the top coat can provide a non-flammable color steel sheet having a required color and sufficiently concealing the color and pattern of the alloy-plated steel sheet.

The alloy plated steel sheet is an alloy plated steel plate having an Al plated layer containing Mg: 5.0 to 30.0 wt%, Si: 5.0 to 15.0 wt%, an alloy plated steel plate having a Zn plated layer containing Mg: 5.0 to 30.0 wt%, Or Al: 1.0 to 25.0% by weight, Mg: may include an alloy plated steel sheet having a Zn plating layer containing 1.0 to 25.0% by weight.

The undercoat may be located on the surface of one or both surfaces of the alloy plated steel sheet. A top coat may be positioned on the surface of the bottom coat. Specifically, the base coat and the top coat may be located on one or both sides of the alloy plated steel sheet.

On the other hand, the coating film may be located only on one side of the alloy plated steel sheet. In this case, the coating film may not be located on the rear surface of the alloy plated steel sheet.

Even when a coating film is located on the rear surface of the alloy plated steel sheet, the thickness of the rear coating film may be 0.1 to 2 μm. This is because the back surface of the alloy-plated steel sheet is excellent in corrosion resistance of the material, and thus may be thin even if the coating film is located.

The thickness of the alloy plated steel sheet may be 0.3 to 0.9mm.

In addition, the top coat may contain 25.0 to 40.0% by weight of the inorganic pigment solid based on the total 100% by weight.

Specifically, since the top coat includes the inorganic pigment in the above range, the top coat may have an excellent hiding rate on the surface of the steel sheet even in a thin environment with a thickness of 8 to 12 μm.

Specifically, the inorganic pigment may be a pigment for implementing a color on the top coat. Accordingly, various pigments can be used depending on the desired color. For example, carbon black, SiO ₂ , TiO ₂ , or a combination thereof may be used. More specifically, it may be in the form of a metal oxide. However, it is not limited thereto.

More specifically, when the solid content is less than 25.0% by weight, color realization and hiding rate may be low even when a 12 μm-thick top coat is formed. In addition, when the solid content exceeds 40.0% by weight, inorganic matters increase in the coating film, and cracking and peeling of the coating film during processing are likely to occur.

In addition, by including the metal oxide solid content, there is an advantageous effect in securing concealability and non-flammability.

In addition, the color steel sheet may have a value of 1.3 to 3.1% according to the following relational formula 1.

[Relationship 1]

{(Top coat thickness (µm) + bottom coat thickness (µm))*10 ^-3 }/alloy plated steel sheet thickness (mm)*100

Specifically, the ratio of the thickness of the upper and lower coat films to the thickness of the alloy-plated steel sheet may be 1.3 to 3.1%. Specifically, when the thickness range of the alloy-plated steel sheet is as described above, it can be used as an interior/exterior finish for construction. In addition, when processing the ceiling material using the non-flammable color steel sheet according to an embodiment of the present invention, continuous processing may be possible.

In addition, if the value according to the relational equation 1 is too small, it is difficult to implement color due to insufficient hiding effect of the material, and when the value according to the relational expression 1 is too large, the thickness of the total coating film becomes thick and it is difficult to secure non-flammability.

Specifically, the thickness of the undercoat may be 1 to 5 μm.

Specifically, when the thickness of the undercoat is thinner than 1 μm, it may be difficult to secure sufficient adhesion and to secure physical properties for use as interior finishing materials for buildings. On the other hand, if the thickness is thicker than 5 μm, in order to obtain non-flammability, the thickness of the top coat must be made thin, and thus the hiding rate may decrease.

In addition, the undercoat may include a water-soluble polyurethane resin or a resin including a functional group capable of chemically bonding to a hydroxyl group.

As will be described later, by inducing a chemical reaction with an isocyanate (-NCO) of a water-soluble polyurethane resin to an alloy plated steel sheet having a hydrophilic surface (-OH) by a degreasing process, adhesion can be secured.

Thus, the primer coating may contain 20 to 30% by weight of urethane solid content.

When the urethane solid content is low, the viscosity of the coating composition is low, so it may be difficult to control the thickness of the undercoat layer. When the content is high, the viscosity is high, making it difficult to apply, and the thickness of the undercoat layer may be formed unevenly.

In addition, the undercoat may be a colored film to which the same color pigment as the upper coat is added to improve transparency or hiding rate. Accordingly, the undercoat may have a transmittance of 20 to 95. Depending on the transmittance, the undercoat may be translucent or transparent.

Specifically, by placing the above-described undercoat film on the surface of the alloy-plated steel sheet, adhesion with the upper coat film can be improved.

The thickness of the top coat may be 8 to 12 μm.

Specifically, if the thickness of the top coat is thinner than 8 μm, the concealing effect may be inferior and physical properties required by the interior finishing material for construction may be insufficient. On the other hand, if the thickness of the top coat is thicker than 12 µm, workability may deteriorate and it may be difficult to secure non-flammability. More specifically, when the thickness of the top coat increases, the rate of change in weight due to combustion increases, and thus gas generation may increase. For this reason, it may be difficult to secure non-flammability due to flame generation.

Specifically, in the non-combustible color steel sheet, the color difference L* value of the top coat layer may be 83 or more.

Hereinafter, in the present specification, "color difference L* value" may mean brightness. Specifically, a larger value in the + direction may mean white, and a larger value in the-direction may mean black.

Accordingly, the color difference L* value of the top coat according to the exemplary embodiment of the present invention may be 83 or more. Specifically, by implementing a white non-flammable color steel sheet as described above, there may be an effect of concealing the color and pattern of the alloy plating and obtaining a desired color.

Accordingly, the hiding rate of the top coat may be 80% or more.

In the present specification, the term "concealment rate" means that the alloy plating layer is covered with the naked eye because the color and pattern of the alloy plating surface are coated with a color paint.

The reason for controlling the concealment rate high in this way is to improve the surface quality by preventing the color and the pattern of the plating layer from being transferred onto the color steel sheet and is evaluated by the color and surface quality of the color steel sheet.

Accordingly, the non-flammable color steel sheet according to an embodiment of the present invention may have excellent color and surface quality with a hiding rate within the above range.

Manufacturing method of non-flammable color steel sheet

Preparing an alloy-plated steel sheet, forming a base coat film on the surface of the alloy-plated steel sheet using the composition for a base coat film, and forming a top coat film using the composition for a top coat film on the surface of the base coat film. I can.

First, a step of preparing an alloy plated steel sheet may be performed.

The alloy plated steel sheet is an alloy plated steel sheet having an Al plating layer containing Mg: 5.0 to 30.0 wt%, Si: 5.0 to 15.0 wt%, an alloy plated steel sheet having a Zn plating layer containing Mg: 5.0 to 30.0 wt%, Or Al: 1.0 to 25.0% by weight, Mg: may include an alloy plated steel sheet having a Zn plating layer containing 1.0 to 25.0% by weight.

At this time, the thickness of the alloy plated steel sheet may be 0.3 to 0.9mm. Specific details are the same as described above in the non-combustible color steel sheet, and thus will be omitted.

In addition, the step of preparing the alloy-plated steel sheet may be prepared by degreasing the surface of the alloy-plated steel sheet.

Specifically, the surface of the alloy-plated steel sheet may be made into a hydrophilic (-OH) surface through a degreasing process. Accordingly, by forming the undercoat film using the water-soluble undercoat composition in a step described later, conditions capable of securing the adhesion of the undercoat film can be provided.

In general, when a color coating film is formed on a steel plate, chemical conversion treatment such as phosphate coating layer, chromate, or non-chromate is performed on the plating layer in order to secure adhesion between the underlying coating film and the plating layer.

However, in the method of manufacturing a non-flammable color steel sheet according to an embodiment of the present invention, a pretreatment (chemical treatment) process may be omitted. Even if the chemical conversion process is omitted, the adhesion between the plating layer and the undercoating film can be secured by forming the undercoating film using the water-soluble undercoating composition described later.

Thereafter, a step of forming a primer film using the composition for a primer film on the surface of the alloy plated steel sheet may be performed.

At this time, the composition for the undercoat film may include a water-soluble polyurethane.

More specifically, by inducing a chemical reaction with an isocyanate (-NCO) of a water-soluble polyurethane resin to an alloy plated steel sheet having a hydrophilic surface (-OH) by a degreasing process, adhesion is secured.

More specifically, the composition for a primer coating may include 10 to 40% by weight of isocyanates, 1.5 to 5.0% by weight of polyols, 0.1% by weight or less of a crosslinking agent, and the balance solvent.

Specifically, the solvent may be ion water.

When the content of the isocyanates and the polyols does not satisfy the component content range, water-soluble polyurethane particles may not be well formed. For this reason, physical properties of the undercoat layer required as a building material may be deteriorated.

In addition, when the content of the crosslinking agent is small, the formation of polyurethane particles may be insufficient, and in many cases, the viscosity may increase and solidify due to gelation.

When the content of the water is low, the composition may not be uniformly mixed, and when the content is high, the drying time is increased, which reduces the efficiency of the manufacturing process, and the viscosity of the coating composition is low, making it difficult to control the thickness of the underlying coating. have.

Accordingly, the step of forming a primer film using the composition for a primer film on the surface of the alloy-plated steel sheet includes applying the composition for a primer film to the surface of the alloy plated steel sheet, and then the highest temperature of the steel sheet (Peak Metal Temperature, PMT). Is dried at a temperature of 200 to 250° C. to form a primer film.

When the temperature is low, the coating film is not sufficiently formed, so that the adhesion of the underlying coating film decreases, and it may adhere to process facilities. In addition, contamination may be caused by mixing in a coating bath in a top coat film forming process described later, and a drying time may be lengthened, thereby reducing process efficiency.

On the other hand, when the temperature is high, the physical properties of the coating film may be deteriorated due to overcuring of the coating film.

Finally, a step of forming a top coat film using the composition for a top coat film on the surface of the bottom coat film may be performed.

Specifically, based on the total 100% by weight of the composition for the top coat, inorganic pigment solids 25.0 to 40.0% by weight, silane 48.0 to 69.0% by weight, acidity control agent 0.01 to 1.0% by weight, thickener 0.5 to 3.0% by weight, matting agent 0.1 To 3.0% by weight, and the balance solvent may be included.

Specifically, the inorganic pigment may be a pigment for implementing a color on the top coat. Accordingly, various pigments can be used depending on the desired color. For example, carbon black, SiO ₂ , TiO ₂ , or a combination thereof may be used.

More specifically, it may be in the form of a metal oxide. However, it is not limited thereto.

The average diameter of the metal oxide may be 5 to 20 nm.

Since the average diameter of the metal oxide is controlled within the above-described range, the composition for a top coat film can be maintained in a stable state.

More specifically, when the diameter of the metal oxide is large, the surface roughness of the coated steel sheet is increased, resulting in poor beauty and easily precipitated and may be unevenly distributed in the composition.If the metal oxide is small, it is uneven in the composition due to agglomeration phenomenon Can be distributed.

The silane may be one or more selected from the group consisting of amino silane and alkoxy silane, and specifically, the silane may be a silane that can be stabilized after hydrolysis. For example, vinyl trimethoxy silane, vinyl triethoxy silane, vinyl triisopropoxy silane, 3-methacryloxypropyl trimethoxy silane ( 3-methacryloxypropyl trimethoxy silane), 2-Glycidyloxy propyl trimethoxy silane, 2-Glycidyloxy propyl triethoxy silane, 2-amino 2-aminopropyl triethoxy silane, 2-ureidoalkyltriethoxy silane, tetraethoxy silane, methyltrimethoxy silane, tetrae Tetraethoxy silane, N-beta-aminoethyl-gamma-aminopropyltrimethoxysilane, 3-aminopropyltriethoxy silane, trimethoxysilane It may be at least one selected from the group consisting of ethoxyphenyl silane and trimethoxyphenyl silane.

Specifically, when the content of the silane is low, it is difficult to form a sufficient bond with the metal oxide nanosol, so that the formation of a coating film may be deteriorated. In addition, since a large amount of silane remains in the top coat, the water solubility, water adhesion, and chemical resistance of the non-flammable top coat may be deteriorated.

The acidity regulator helps hydrolyze the silane and improves the stability of the silane.It is composed of organic acids such as acetic acid, formic acid, latic acid, and glyconic acid, and organic-inorganic acids such as sulfuric acid, nitric acid, hydrochloric acid, and hydrofluoric acid. It may be one or more selected from the group.

Specifically, when the content of the acidity control agent is small, the storage properties of the top coat film may be reduced due to an increase in the hydrolysis time, and when the content of the acidity control agent is large, corrosion of the steel sheet may occur and control of the molecular weight may be difficult.

The thickener serves to improve workability by adjusting the viscosity of the composition for a ceramic top coat, and to prevent precipitation of the matting agent.

Specifically, when the content of the thickener is small, the viscosity of the composition is low, and workability may be deteriorated, and when the content of the thickener is large, the stability and chemical resistance of the composition may decrease.

The matting agent may play a role in controlling gloss and improving the hardness of the coating film.

When the content of the matting agent is small, it may be difficult to adjust the gloss and improve the hardness of the coating film, and when the content of the matting agent is large, it may cause a decrease in gloss and cracking of the top coat layer.

The solvent may play a role of controlling the compatibility and hydrolysis of the silane with water, the wetting of the treatment agent, and the drying rate. Specifically, the solvent may be a water-soluble solvent. More specifically, the solvent may include at least one selected from the group consisting of methanol, ethanol, 2-propanol, 2-methoxypropanol, and 2-butoxyethanol, but is not limited thereto.

Accordingly, in the step of forming a top coat film using the top coat composition on the surface of the bottom coat film, the top coat composition is subjected to a sol-gel reaction, followed by coating and drying to form a top coat film.

The top coat obtained by the sol-gel reaction may be a hybrid composite coating layer having an intermediate characteristic of an inorganic material and an organic material. Therefore, it is possible to solve the brittle disadvantage that may occur when the inorganic material is used alone. In addition, by having flexibility through the addition of organic substances, there is an advantage in that the alloy plated steel sheet having the top coat film formed thereon can be processed into various shapes.

In addition, in the step of forming a top coat film using the top coat composition on the surface of the bottom coat film, the peak metal temperature (PMT) of the steel sheet is 240 to after applying the above-described top coat composition to the bottom coat surface. It can be dried at a temperature of 280 ℃ to form a top coat.

When the temperature is low, the formation of the top coat film is insufficient, resulting in inferior properties of the coat film, and adhesion between materials may occur. In addition, the drying time may be lengthened, resulting in a decrease in process efficiency. On the other hand, when the temperature is high, fine cracks in the top coat may occur, resulting in deterioration of the coat properties.

Thereafter, the step of obtaining and processing the non-flammable color steel sheet on which the top coat is formed may be further performed.

Specifically, in the case of using the non-combustible color steel sheet according to the embodiment of the present invention, it may be possible to process the color by a continuous press process after color implementation.

Specifically, after slitting the non-combustible color steel sheet, a blanking (shape sheet metal) process and a shape processing process are performed at a time, and a processed material can be easily manufactured by a continuous pressing process.

Accordingly, it is possible to provide a non-flammable color steel sheet and a molded article excellent in productivity and economy.

Example

An alloy plated steel sheet having a thickness of 0.8 mm on which a zinc-aluminum-magnesium alloy plated layer was formed was prepared. At this time, the surface of the plated steel sheet was cleaned using an alkali degreasing agent and dried by supplying hot air.

Thereafter, with respect to the total 100% by weight, a composition for a primer film comprising 25% by weight of isocyanates, 3.5% by weight of polyols, 0.05% by weight of a crosslinking agent, and the balance water was prepared.

After the composition for a primer film was applied to the alloy plated steel sheet by a roll coating method, hot air drying was performed at 235° C. for PMT for about 1 minute to form a primer film. At this time, the thickness of the underlying coating film was controlled by the pressure of the roll applied to the steel sheet passing between the roll and the roll.

Thereafter, with respect to the total 100% by weight, 25 to 40% by weight of inorganic pigment, 40% by weight of silane (vinyl trimethoxy silane), 0.05% by weight of acidity regulator (nitric acid), 1.5% by weight of thickener (Carboxymethyl cellulose), matting agent ( Silica) 1.0% by weight, and a composition for a top coat comprising the remaining solvent (ethanol) was prepared. Specifically, the inorganic pigment was made different as disclosed in Table 1 below.

After the composition for the top coat was applied to the surface of the bottom coat, hot air drying was performed at a temperature of 260° C. PMT for 1 minute to form a top coat.

After preparing the non-flammable color steel sheet as described above, the thickness, color difference value, and hiding rate of the upper and lower coat films according to the solid content were measured to compare physical properties.

Specific measurement methods and results are as follows.

Method for measuring the thickness of the upper and lower coats

The thickness of the upper and lower coating films was observed with a Scanning Electron Microscope (SEM) after cutting each color steel sheet, fixing and polishing the cross section, and measuring the thickness of the coating layer of the color steel sheet.

Color difference value How to measure

For color difference measurement, the initial value is corrected using a white standard test piece using a color difference meter, and L*, a*, b* of the color sample are measured and stored. After that, the color difference value between the color steel plate and the standard specimen was stored and evaluated. In this case, the measured value of the color difference was automatically calculated and displayed.

Specifically, the L* value refers to brightness and refers to the relationship between white and black. The larger the L* value in the + direction means white, the larger the value in the-direction means black. The a* value means the relationship between red and green. A larger value in the + direction means red, and a larger value in the-direction means green. The b* value refers to the relationship between yellow and blue. A larger value in the + direction means yellow, and a larger value in the-direction means blue.

How to measure the hiding rate

Concealment rate is the degree of color of the color steel plate compared to the color of the toned paint and the degree to which the pattern of the plating layer is projected by visually observing the surface of the color steel plate. When changed, 80 to 90% of the pattern of the plating layer was projected somewhat, and the degree of the plating layer was concealed by the color of the paint, but when the angle was changed, the degree to which the pattern of the plating layer was clearly visible was measured by dividing it into about 60 to 80%.

A more specific measurement method is as follows.

◎: More than 90% hiding rate

-Over 90% color compared to paint color

-The pattern of the plating layer is not projected even when observed according to the angle change.

○: Concealment rate 90 to 80%

-90 to 80% of color compared to paint color

-There is a degree to which the plating layer pattern is projected depending on the angle change.

△: 60 to 80% hiding rate

-60 to 80% of color compared to paint color

-The pattern of the plating layer is projected without changing the angle

division Solid content Hado
thickness
[㎛] normal course
thickness
[㎛] Relation 1 Color difference value Concealment rate L a b Comparative Example 1 - 5 15 2.5% 91.71 -1.58 -0.25 ◎ Comparative Example 2 40 wt.% - 12 - 91.05 -1.43 -2.15 ○ Comparative Example 3 20 wt.% 3.0 11.5 1.8% 88.06 -1.45 -2.35 △ Comparative Example 4 45 wt.% 2.2 11.8 1.8% 92.35 -1.67 -1.45 ◎ Comparative Example 5 25 wt.% 1.2 3.4 0.6% 79.39 -1.98 -2.95 △ Comparative Example 6 1.2 5.7 0.9% 82.5 -2.06 -2.93 △ Comparative Example 7 1.4 7.9 1.2% 83.27 -1.93 -2.99 △ Example 1 1.2 9.8 1.4% 86.41 -2.02 -2.00 ○ Comparative Example 8 4.0 3.6 1.0% 79.39 -1.98 -2.95 △ Comparative Example 9 3.1 5.3 1.1% 82.50 -2.06 -2.93 △ Example 2 2.9 8.0 1.4% 83.27 -1.93 -2.99 ○ Example 3 3.5 11.2 1.8% 86.41 -2.02 -2.00 ○ Comparative Example 10 40 wt.% 1.2 3.5 0.6% 83.69 -1.97 -3.88 △ Comparative Example 11 1.3 6.7 1.0% 87.84 -1.95 -3.04 △ Example 4 1.3 9.3 1.3% 89.91 -1.95 -2.33 ○ Example 5 1.2 11.5 1.6% 91.62 -1.91 -1.19 ◎ Comparative Example 12 2.5 4.7 0.9% 84.82 -2.00 -3.80 △ Comparative Example 13 4.6 6.8 1.4% 87.46 -1.96 -3.33 △ Example 6 3.0 8.9 1.5% 89.63 -1.94 -2.34 ○ Example 7 3.1 11.3 1.8% 91.28 -1.93 -1.34 ◎

As shown in Table 1 above, in the case of Comparative Example 2 in which only the top coat was applied without applying the undercoat, there was no water-soluble undercoat, and thus peeling occurred due to poor adhesion.

In addition, in the case of Comparative Example 3 in which the solid content is less than in Example, it can be seen that the hiding rate is poor. On the other hand, in the case of Comparative Example 4 in which the solid content was higher than that of the Example, the hiding rate was excellent, but the problem of poor adhesion was confirmed due to the high inorganic matter.

On the other hand, Comparative Example 1 is a color steel sheet in which a commercial molten galvanized steel sheet is coated. It can be seen that the alloy steel sheet according to Comparative Example 1 has a large L* value and has excellent hiding rate. However, it can be seen that the thickness of the top coat of the steel sheet according to Comparative Example 1 is 15 μm, which is thicker than that of the example. Accordingly, when using Comparative Example 1, it has a disadvantage of not having non-flammability.

In addition, the results are also shown in Figures 2 to 3.

2 is a photograph showing the appearance of the non-flammable color steel sheet according to the Example and Comparative Example.

3 shows the results of measuring the thickness of upper and lower coating films of non-combustible color steel sheets according to Examples and Comparative Examples.

As shown in FIG. 2, it can be seen that the embodiment implements a color close to white visually, while the comparative example implements the color.

Accordingly, it was confirmed that the hiding rate was good and that the desired color was sufficiently displayed.

4 is a cross-sectional view of a specimen that has been determined as a non-combustible material.

As shown in Figure 4, the specimen can be seen the result that the upper and lower coats were formed with a thickness of 13.8 to 14.4 μm on the surface of a 0.43 mm alloy plated steel sheet.

In the case of the specimen, it can be seen that each of the thicknesses of the upper and lower coating films are included in the range of one embodiment of the present invention. However, the value according to the relational expression 1 ({(top coat thickness (㎛) + bottom coat film thickness (µm)) *10 ^-3 }/alloy plated steel plate thickness (mm) *100)) is 3.2%, an embodiment of the present invention It can be seen that it is larger than the range according to.

As a result, it can be seen that the specimen shown in FIG. 4 is not suitable as a non-combustible material as shown in FIG. 5.

5 shows the results of a non-combustible material nonconformity test result of the specimen disclosed in FIG. 4.

As shown in FIG. 5, the specimen disclosed in FIG. 4 was not suitable as a non-combustible material as a result of a non-combustible suitability test.

6 shows a cross section of a specimen that has been judged as being suitable for an actual non-combustible material.

As shown in FIG. 6, it can be seen that the specimen was formed with a top coat layer having a thickness of 10.8 μm and a bottom coat layer having a thickness of 1.0 μm on the surface of a 0.43 mm alloy plated steel sheet.

In the case of the specimen, it can be seen that not only the thickness of the upper and lower coat films but also the value according to the relational equation 1 satisfies one embodiment of the present invention. Specifically, the value according to the relational equation 1 is derived as 2.7%.

As a result, it can be seen that the specimen shown in FIG. 6 is suitable as a non-combustible material as shown in FIG. 7.

7 shows the results of a non-combustible material suitability test result of the specimen disclosed in FIG. 6.

Specifically, as shown in FIG. 7, the specimen disclosed in FIG. 6 passed both the non-combustible test and the gas hazard test for measuring the difference between the mass reduction rate, the maximum temperature and the final equilibrium temperature, and it was found that it satisfies the non-combustible material standard. I can.

The present invention is not limited to the above embodiments, but may be manufactured in a variety of different forms, and those of ordinary skill in the art to which the present invention pertains may It will be appreciated that it can be implemented with. Therefore, it should be understood that the embodiments described above are illustrative in all respects and not limiting.

Claims (14)

Alloy plated steel plate;
A primer film positioned on one or both surfaces of the alloy plated steel sheet; And
It is a non-flammable color steel sheet comprising a top coat film located on the surface of the base coat film,
The top coat is based on the total 100% by weight, inorganic pigment solid content: 25.0 to 40.0% by weight, silane 48.0 to 69.0% by weight, acidity control agent 0.01 to 1.0% by weight, thickener 0.5 to 3.0% by weight, and matting agent 0.1 to 3.0% by weight Contains %,
The non-flammable color steel sheet is a non-flammable color steel sheet having a value of 1.3 to 3.1% according to the following relational formula 1.
[Relationship 1]
{(Top coat thickness (µm) + bottom coat thickness (µm))*10 ^-3 }/alloy plated steel sheet thickness (mm)*100
In claim 1,
The thickness of the top coat film is 8 to 12㎛ non-combustible color steel sheet.
In paragraph 2,
The thickness of the alloy-plated steel sheet is 0.3 to 0.9mm incombustible color steel sheet.
In paragraph 3,
The thickness of the base coating film is 1 to 5㎛ non-combustible color steel sheet.
delete In claim 1,
The color difference L* value of the top coat film is 83 or more.
In clause 6,
The non-flammable color steel sheet having a hiding rate of 80% or more of the top coat.
Preparing an alloy plated steel sheet;
Forming a primer film on the surface of the alloy plated steel sheet by using a composition for a primer film; And
Including the step of forming a top coat film using the composition for a top coat film on the surface of the bottom coat film,
The composition for the top coat film is based on the total 100% by weight,
Inorganic pigment solid content 25.0 to 40.0% by weight, silane 48.0 to 69.0% by weight, acidity control agent 0.01 to 1.0% by weight, thickener 0.5 to 3.0% by weight, matting agent 0.1 to 3.0% by weight, and the balance solvent,
The non-flammable color steel sheet is a method of manufacturing a non-flammable color steel sheet having a value of 1.3 to 3.1% according to the following relational formula 1.
[Relationship 1]
{(Top coat thickness (µm) + bottom coat thickness (µm))*10 ^-3 }/alloy plated steel sheet thickness (mm)*100
In clause 8,
In the step of forming a top coat film on the surface of the bottom coat film using the composition for a top coat film,
The method of manufacturing a non-flammable color steel sheet, wherein the thickness of the top coat is in the range of 8 to 12 μm.
In clause 8,
In the step of preparing the alloy plated steel sheet,
The thickness of the alloy-plated steel sheet is 0.3 to 0.9mm, the method of manufacturing a non-combustible color steel sheet.
In clause 8,
In the step of forming a primer film using the composition for a primer film on the surface of the alloy plated steel sheet,
The method of manufacturing a non-flammable color steel sheet, wherein the thickness of the base coat is in the range of 1 to 5 μm.
delete In clause 8,
Based on 100% by weight of the total composition for the undercoat film,
A method for producing a colored steel sheet comprising 10 to 40% by weight of isocyanates, 1.5 to 5.0% by weight of polyols, more than 0% by weight and less than 0.1% by weight of a crosslinking agent, and the balance solvent.
In clause 8,
After the step of forming a top coat film using the composition for a top coat film on the surface of the bottom coat film,
The method of manufacturing a non-combustible color steel sheet further comprising the step of processing the non-combustible color steel sheet on which the top coat is formed.

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