KR100395098B1 - Manufacturing method of strip for soundproofing wall outer panel using steel color painted strip - Google Patents

Abstract

PURPOSE: A steel color painted strip is provided in which chromate film, epoxy or polyester resin based lower paint layer and polyester resin based upper paint layer are sequentially formed on the surface of hot dip galvanized strip, and a manufacturing method of strip for soundproofing wall outer panel using the painted strip is provided. CONSTITUTION: The method comprises a step of forming a chromate coating film to an adhesion quantity of 20 to 100 mg/m¬2 on the surface of hot dip galvanized strip; a step of forming a lower paint layer by coating an epoxy or polyester resin based paint solution on the chromate coating film; a step of manufacturing a steel color painted strip by coating a polyester resin based paint solution on the lower paint layer, thereby forming an upper paint layer on the lower paint layer; a step of mechanically processing the steel color painted strip into a work for soundproofing wall; and a step of treating a part exposed by the processing in one method selected from the group consisting of transparent paint coating, phosphate treatment, chromate treatment and electrodeposition coating methods, wherein the transparent paint coating method is performed by squeezing or spray method, the phosphate treatment method is carried out in an ordinary manner, the chromate treatment method is performed for 10 to 90 seconds, and the electrodeposition coating method is performed to form an electrodeposition coating layer by impressing voltage of 100 to 400 volts.

Description

Manufacturing method of steel plate for soundproof wall shell using steel collar sheet steel

The present invention relates to a steel sheet used for soundproof walls installed for noise reduction of roads and railroads, and more specifically, a material coated with a color coating in various colors on a galvanized steel sheet, and a soundproof wall having excellent surface appearance and cross-sectional corrosion resistance using the same. It relates to a method for producing a steel sheet.

Nowadays, as interest in clean environment grows, the sufferings of modern people due to various pollutions are increasing and it is difficult to endure. Thus, not only the desire for clean air and water, but also the desire for liberation from the noise of living is negligible. The soundproof wall is installed to block such various noises. A typical soundproof wall structure consists of an inner steel plate facing the road, an outer steel sheet on the residential side, and a sound absorbing material in the middle (Insulation Products, 1991, p1).

The current appearance of the soundproof wall installed in Korea is uniform in alumina material in the form of unpainted, and the exterior is simple metallic intrinsic color, so the aesthetics are not good, and the appearance is not suitable for the personalization and colorization trend of the design (IndustriesTextile) , 1978, October, p95, Textile Month 1979, p27 and JP 5051795). Low-rise residents of apartments or buildings with soundproof walls not only feel the monotony and boredom that comes from simple silver, but some homeowners are also opposing the installation of soundproof walls because of lower housing prices. In addition, the existing Al soundproof wall is discolored due to oxidation in the air and contact with soot. In order to clean it, it has to be wiped off with expensive specialty chemicals, and the metallic natural luster can reflect the headlights of automobiles, which may affect safe driving. have.

In addition, since aluminum is not produced in Korea and is imported in its entirety, precious foreign currency is consumed by importing materials required for making soundproof walls.

For this reason, there is an example of applying the stainless steel plate to the soundproof wall disc material without using aluminum material (Oct 1994, p78). However, due to the high cost and difficulty of pre-painting the original plate, it is difficult to apply it.

In order to solve the above problems, the present invention uses a hot-dip galvanized steel sheet instead of an aluminum material, and forms a chromate coating and a coating layer having a suitable thickness on the steel sheet, thereby providing excellent coating adhesion, processability, and corrosion resistance. To provide a steel sheet, for that purpose.

In addition, the present invention is to provide a steel sheet for soundproof wall outer plate excellent in coating adhesion, processability, surface corrosion resistance as well as cross-sectional corrosion resistance by performing a corrosion resistance improvement treatment after processing using the steel color-coated steel sheet, an object thereof.

The present invention is a steel color sheet steel sheet made of a hot-dip galvanized steel sheet, the bottom coating made of a chromate coating of ^{20 to} 100 mg / m ² , epoxy resin or polyester resin on the surface of the hot-dip galvanized steel sheet, and The present invention relates to a steel color-coated steel sheet in which an upper coating layer made of a polyester resin is formed in sequence.

In addition, according to the present invention, in the method for manufacturing a soundproof wall outer plate, a chromate film is formed on the surface of a hot-dip galvanized steel sheet with an adhesion amount of 20 to 100 mg / m ² , and a coating liquid comprising epoxy resin or polyester resin is formed on the chromate film. Coating to form a lower coating layer, coating a coating liquid made of a polyester resin on the lower coating layer to form an upper coating layer to produce a steel color coated steel sheet, and then mechanically processing the steel color coated steel sheet with a soundproof wall material In the manufacturing method of the steel plate for soundproof wall outer plate using steel color coated steel sheet which is treated by one method selected from the group consisting of transparent coating method, phosphate treatment method, chromate treatment method and electrodeposition coating method after performing It is about.

Hereinafter, the present invention will be described in more detail.

In the present invention, the hot-dip galvanized steel sheet is degreased using a hot-dip galvanized steel sheet as a base steel sheet, and chromate treatment having an adhesion amount of 20 to 100 g / m ² is applied to the surface of the de-hot dip galvanized steel sheet by coating treatment. .

When the chromate coating amount is 20 mg / m ² or less, the chromate coating amount is too small to deteriorate the corrosion resistance, while the coating processability deteriorates in the chromate coating amount range of 100 mg / m ² or more. Therefore, in this invention, the chromate coating amount is limited to 20-100 mg / m <^2> .

In the present invention, after forming the chromate film, a lower coating layer is formed by using a polyester or epoxy resin system.

When the coating thickness of the lower coating layer (lower coating) of the coated steel sheet is 2 μm or less, the adhesion with the upper coating layer (upper coating) is degraded and the corrosion resistance is poor. When the coating thickness is 8 μm or more, the workability is degraded. Therefore, it is preferable to set the lower coating layer coating film thickness of a polyester resin type or an epoxy resin type to 2-8 micrometers.

In addition, in forming the lower coating layer, when the baking temperature is 180 ° C. or lower, curing after coating of the polyester or epoxy resin is incomplete, resulting in deterioration of adhesion and workability with the upper coating layer, and deterioration of corrosion resistance and weather resistance. When the temperature is 220 ° C. or more, the epoxy coating film is overcured to degrade adhesion to the upper coating layer, thereby degrading workability, corrosion resistance and weather resistance. Therefore, it is preferable to set the baking temperature of the lower coating layer to 180 to 220 ° C.

In the present invention, the upper coating layer is formed using a polyester resin system. When the upper coating layer is formed using the polyester resin, the coating film thickness is preferably limited to 10 to 25 μm. The reason is that when the coating film thickness is 10 μm or less, the coating film thickness is so thin that corrosion resistance, weather resistance and color stability If the concealing force is deteriorated, and the thickness is more than 25 μm, the cost is added as much as the thickness of the coating, and the increase in the thickness of the coating may cause delamination between the lower coating layers, and the coating may be bubbling to deteriorate the appearance of the product. Therefore, when forming an upper coating layer by the polyester resin system, it is preferable to restrict the coating film thickness to 10-25 micrometers, and can change a color by adding a pigment.

In addition, the baking temperature for forming the upper coating layer is preferably limited to 190-250 ° C. The reason is that below 190 ° C, the coating film hardness deteriorates due to incomplete curing after coating, and thus the solvent resistance, corrosion resistance, and the like are deteriorated. If the temperature is 250 ° C. or more, the color of the upper coating layer is changed to deteriorate the appearance of the product.

In the present invention, the upper and lower coating layers may be coated by a conventional coating method, and a preferred coating method may be a roll coating method.

Piercing (hole) and roll forming processing are performed in the soundproof wall processing plant using the color coated steel sheet manufactured by the above method. When the piercing processing is performed, the base material of the hot-dip galvanized steel sheet Iron is exposed as it is, and corrosion resistance is low, so the soundproof wall with beautiful surface appearance is not worth it. Therefore, in order to secure the cross-sectional corrosion resistance, one method should be selected from the transparent coating method, the phosphate treatment method, the chromate treatment method or the electrodeposition coating method. Among them, the most preferred method is electrodeposition coating method.

First, the squeezing and spraying methods may be applied to the transparent paint application method. The application of such a transparent paint is somewhat poor surface appearance, but the desired cross-sectional corrosion resistance can be obtained to some extent.

Next, the chromate treatment can be applied by deposition or spraying. In this case, the chromate solution may be a solution usually used in the plating factory.

Next, a phosphate treatment method can be performed by a conventional method.

Next, in order to obtain the cross-sectional corrosion resistance by electrodeposition coating method, it is preferable to limit the voltage applied to the color steel sheet to 100 to 400 volts. The reason is that the electrodeposition coating film formed to be 100 volts or less is not enough to show satisfactory cross-sectional corrosion resistance, whereas if it is 400 volts or more, it can cover the exposed iron portion of the piercing site to secure sufficient cross-sectional corrosion resistance, but it is not pierced. In addition to the soundproof wall surface, the electrodeposition coating film is formed and bubbling is formed to damage the beautiful surface appearance which is the main advantage of the color steel sheet. Therefore, the treatment in the above range can ensure excellent surface appearance and cross-sectional corrosion resistance.

Corrosion resistance greatly depends on the piercing processing direction of the coated steel sheet for the soundproof wall outer plate. When the processing direction is performed from top to bottom rather than roll forming by performing the processing direction from the bottom to the top, it is advantageous to secure more excellent cross-sectional corrosion resistance when treated in a method for securing the cross-sectional corrosion resistance.

Hereinafter, the present invention will be described in more detail with reference to Examples.

Example 1

Color Coating purpose when a color coating line with a coating weight 150g / m ² (Z27) to which hot-dip galvanizing after by the steel sheet to degreasing step to remove the foreign matter and contaminants adhering to the surface attached to the surface of the degreasing step by treatment Alkali The degreasing solution was removed and prepainted (chromated) was subjected to the chromate solution (Dae Parker ZM 1300 AN) under the conditions shown in Table 1 below. As described above, using the chromate-treated specimen, which is a pre-painting treatment, the coating treatment was performed in a 2 coat / 2 bake manner as shown in Table 1 below.

As described above, the coating adhesion (flat part and processed part) coating processability, coating impact resistance, and corrosion resistance were evaluated for the pre-painted and coated specimens, and the results are shown in Table 2 below. The film adhesion in the following Table 2 was made by applying 100 pieces of checkerboard to the coated steel sheet at regular intervals of 1 mm at the coating film of the specimen, and then attaching and removing the scotch vinyl tape on the surface of the flat part and Ericsen 6 mm extruded part. The degree of coating processability was strongly bent (curvature radius 2T, where T is the thickness of the specimen), and then the scotch vinyl tape was adhered and peeled on the curved surface, and then the film peeling state was evaluated.

In addition, the impact of the coating film was measured by dropping the weight on the surface of the coated steel sheet from the height of 50cm by using a DuPont impact tester. The weight of the coating film was used at 500 sul 1g and the tip diameter of the pen was 12.7 sul 0.06 mm.

On the other hand, after corrosion of X-shaped scratches on the coated steel sheet, the salt spray test (5% NaCl, 35 ℃, injection pressure 1kg / m ² ) for 500 hours to swell the coating film and white blue or red blue near X The incidence was evaluated.

TABLE 1

TABLE 2

As shown in Table 2, the adhesion of the chromate to the surface of the molten zinc steel sheet is secured at 10 mg / m ² (Comparative Example 5), but the film adhesion and impact resistance are secured, but the corrosion resistance is deteriorated, whereas at 120 mg / m ² (Comparative Example 6) Corrosion resistance is secured, but it can be seen that coating film adhesion and processability deteriorate.

On the contrary, it can be seen that the coating pretreatment and the coating examples (1 to 4) according to the present invention have excellent coating film adhesion, processability, impact resistance and corrosion resistance.

Example 2

Piercing (hole) and roll forming processing in the soundproof wall processing plant using the coated steel sheet described in Example 1, chromate treatment, electrodeposition coating and transparent coating application to secure the cross-sectional corrosion resistance is shown in Tables 3, 4 and 5 Treated as In addition, the cross-sectional corrosion resistance and surface appearance were observed and the results are shown in Tables 3, 4 and 5, respectively.

TABLE 3

TABLE 4

TABLE 5

As shown in Table 3, inventive examples (7, 8, and 9) having an appropriate range of chromate treatment time in order to secure cross-sectional corrosion resistance satisfy corrosion resistance and surface appearance, whereas comparative example (10) lacks treatment time. In this case, the corrosion resistance is not satisfied, but in the case of the comparative example (11), the corrosion resistance is satisfied, but the surface of the coated steel sheet is damaged due to prolonged treatment. In other words, it can be seen that the chromate treatment brings about improved cross-sectional corrosion resistance.

As shown in Table 4, the inventive examples (12, 13, 14, and 15) satisfy the corrosion resistance and the surface appearance of the electrodeposition coating, whereas the comparative example (16) shows the lack of sufficient coating due to the insufficient processing voltage. In the case of Comparative Example (17), the corrosion resistance is satisfactory due to formation, but the corrosion resistance is not satisfied selectively due to the long-term treatment, and the coating film is formed on all the coated steel sheets so that the surface of the coated steel sheet is not damaged. do. That is, it was found that the cross-sectional corrosion resistance is improved by electrodeposition coating.

As shown in Table 5, when the transparent paint is applied by applying a transparent paint spray, the cross-sectional corrosion resistance and surface appearance have achieved the object of the present invention to some extent, but when the transparent paint is applied by applying squeegee, the transparent paint flow Although the surface is damaged due to the back, it can be seen that the corrosion resistance is secured to some extent.

When the steel sheet for soundproof wall outer plate provided in the present invention as described above is applied to the soundproof wall, it is possible to improve the appearance of the city and create a fresh image by realizing dozens of various graphic colors. It does not change the black condition due to the effects of soot and corrosion, and the attachments such as dirt and dust can be washed with rain water or general purpose water.Also, aluminum is imported from all over the world. Very high.

Claims (5)

In the manufacturing method of the steel plate for soundproof wall outer plate, Forming a chromate film on the surface of the hot-dip galvanized steel sheet with an adhesion amount of 20 to 100 mg / m ² ; Coating a coating liquid made of epoxy resin or polyester resin on the chromate film to form a lower coating layer; Manufacturing a steel color coated steel sheet by coating a coating liquid made of a polyester resin on the lower coating layer to form an upper coating layer; Performing mechanical processing of the steel color-coated steel sheet into a soundproof wall material; And Treating the exposed part by the processing by one method selected from the group consisting of a transparent coating method, a phosphate treatment method, a chromate treatment method, and an electrodeposition coating method; The transparent coating is performed by one of the squeeze method and the spray method, the phosphate treatment is performed by a conventional method, the chromate treatment is carried out for 10 to 90 seconds, the electrodeposition coating is applied by applying a voltage of 100 to 400 volts electrodeposition The manufacturing method of the steel plate for soundproof wall outer boards using the steel color-coated steel sheet which forms forming a coating. The method of claim 1, The coating film thickness of the lower coating layer is formed to 2 to 8μm, the coating film thickness of the upper coating layer is formed to 10 to 25μm, characterized in that the steel sheet for soundproof wall plate using the steel color coated steel sheet. The method according to claim 1 or 2, After coating the coating liquid when forming the lower coating layer, a method of producing a soundproof wall outer plate using a steel color painted steel sheet characterized in that the baking process at a temperature range of 180 ~ 220 ℃ to form a lower coating layer. The method according to claim 1 or 2, The coating method of coating the coating liquid when forming the upper coating layer, the method of producing a soundproof wall outer plate using a steel color coated steel sheet, characterized in that the baking step at a temperature range of 190 ~ 250 ℃ to form an upper coating layer. The method according to claim 1 or 2, The upper and lower paint layers are formed by a roll coating method.