KR100535910B1 - Coating material for representing diverse patterned design and process for manufacturing colored steel sheet coated therwith - Google Patents

Abstract

The present invention relates to a paint for color steel sheets having various patterns painted by a gravure offset method using a heat shield paint and a method of manufacturing a color steel sheet using the paint.

Description

Coating material for representing diverse patterned design and process for manufacturing colored steel sheet coated therwith}

The present invention relates to a paint for color steel sheets exhibiting various patterns painted by a gravure offset method using a heat shield paint and a method for producing a color steel sheet using the paint. More specifically, by using a paint on a gravure offset type printed steel sheet using ink, a method of manufacturing a color steel sheet having improved corrosion resistance and durability significantly compared to using an ink while displaying various conventional patterns as it is, and a paint for the color steel sheet It is about.

In general, in the case of a conventional printed steel sheet using ink, there are seven steps (see Fig. 4), which are generally composed of the bottom layer, the base, and the printing of the bar shown in Fig. 3 (1 to 3 degrees), clear, etc. on the base layer. A separate printing facility called a printing press must be used. However, the present invention improves the corrosion resistance and durability by using a paint rather than an ink, compared with conventional printing steel sheets using ink, and its composition is also four steps of a base layer, a bottom coating layer, a base coating layer, and a printing layer. It is characterized in that it is configured to be reduced.

This coating method can exhibit surface properties and textures with various patterns that can not be felt in the conventional printing steel sheet (for a printing steel sheet using a conventional ink, the thickness of the printing layer is 1-2 μm and is clear on it. In addition, the present invention is characterized in that it is produced using a coating machine used when producing a general coated steel sheet, without using a separate printing machine.

Accordingly, the present invention is characterized in solving various problems of the conventional printed steel sheet and expressing various patterns by using a paint in a coating machine without using an ink and a printing machine. Special design is required for manufacturing techniques and paints for forming patterned layers.

The present invention mainly aims at increasing the durability of steel sheets using high weatherability polyester resins and fluorine resin paints, and also by controlling the reflectance of solar heat by using paints using heat shielding pigments. Its purpose is to reduce the energy required for cooling and heating.

In order to achieve the above object, the present invention has developed a paint as described above. This paint is used to form a patterned layer of color steel sheet. As a binder, 30 to 40% by weight of main resin, 10 to 20% by weight of auxiliary resin, 3% by weight or less of colored artificial mica, and 1 to 1 of cobalt-ferrite-chromium black pigment 4% by weight, 2-4% by weight of zinc-iron blue pigment, 2-4% by weight of chrome-iron brown pigment, 1-3% by weight of ceramic yellow pigment, 0.2% by weight or less of silica defoamer, 0.2% by weight of special acrylic defoamer, It is a coating material which consists of 0.3 weight% or less of a thixotropic regulator, 4-6 weight% of aromatic solvents, 2-3 weight% of aliphatic solvents, 30-35 weight% of ketone solvents, and 100 weight% in total. This paint can be designed to have a depth of about 100-300 탆 according to the pattern of the pattern on a printing roll in order to coat 5-10 탆 as a paint for forming a pattern layer.

 Figure 2 shows an example of the coating machine according to the present invention, when the printing roll picks up the paint from the coating pan which is a paint supply container and transfers it to the transfer roll or the applicator roll, the paint picked up from the blade B is fixed. The surface of the paint to be delivered is cut uniformly.

The print roll, which has a smooth surface as it passes through the blade, transfers the paint on the intaglio to the transfer roll. The transfer roll transfers a pattern or the like to a backup roll, and eventually transfers and coats the pattern layer on the surface of the color steel sheet.

In addition, the method of painting the pattern is selected in the manner of natural, reverse, full-reverse in consideration of workability and the surface of the paint. As shown in FIG. 3, the electrostatic coating method is a method in which a coil roll rotates in a manner in which an applicator roll or a transfer roll rotates in the same direction as a traveling direction. , The reverse method is a way that the direction of the coil strip and the applicator roll rotates in the opposite direction, the full reversing method is a method of painting using three rolls, a suitable roll in consideration of the shape and thickness of the pattern It adopts roll coating method.

The present invention is characterized by a coating technology for maximizing the transfer rate of the coating according to the depth of the printing roll when painting the pattern pattern using a coating machine and in the present invention shows the transfer rate of the paint used in the pattern layer up to 5-20%. It is important to set the hardness, pressing force and peripheral speed ratio of the paint roll that can be produced.

The present invention basically washes the surface of the known base layer (1) with an alkali degreasing agent and is subjected to a chromate coating (2) thereon to form a 5-15 μm thick undercoat layer (3). The base layer (4) is formed, and the method for producing a printed color steel sheet using a paint to form a pattern layer (5-10㎛) thereon, characterized by using a paint machine without using a printing machine. .

The main resin used as the base paint may be a polyester resin, a silicone pulley polyester resin, a fluorine resin, or the like, and may be selected from any one of three types, and the composition is 40-60% of a binder composed of a resin. Based on the composition of the weight percent of the colorant, the conventional inorganic or organic coloring pigment and metal oxide are compounded, and special coloring pigments such as cobalt, iron, and chromium having excellent infrared reflectance are dispersed to maximize the weatherability and infrared reflection function. It is characterized by imparting functionality that can minimize the increase in room temperature caused by sunlight in dark colors.

The paint forming the pattern layer is based on the use of the same type of resin to improve the adhesion with the bay layer. While maintaining the food thixotrophy (thixotrophy) it was possible to control the high viscosity, defoaming defects that can occur during high-speed roll (roll) operation.

In addition, the viscous pattern is designed to maintain the same working conditions in any color of solid and mica based on Ford Cup # 4 so that the pattern can remain in shape until it is dried after painting. It is characterized by the manufacture of a paint that can exhibit a pattern.

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

The present invention is chromate after alkaline degreasing for removing foreign matter adhered to the surface of the base, aluminum, hot-dip galvanized steel sheet, electrogalvanized steel sheet, zinc-55% aluminum plated steel sheet, stainless steel sheet used in the normal continuous coating process After coating the coating process and coating the undercoat layer 3 of 5-15㎛ thickness, it is dried by heating at 200 ~ 220 ℃ which is 10 ~ 20 ℃ higher than the normal drying temperature range of polyester resin used as resin. Cover the undercoat. Next, the coating material constructed as shown in Table 1, that is, the base coating material using a heat shielding pigment was heat-dried at 210 to 250 ° C. to coat a dry coating layer of 15 to 25 μm, and is suitable for forming a pattern layer after coating the base coating material. Using a paint for forming a pattern layer to be designed to dry by heating to 210 ~ 250 ℃ to coat a pattern coating layer of 5 ~ 10㎛ to prepare a color steel sheet as shown in FIG.

The temperature range of 210 to 250 ° C is a drying condition temperature range of the resin to represent the base resin or pattern. The lower limit of this temperature range is the lower limit of drying efficiency, and when the upper limit is exceeded, defects such as cracking and poor adhesion are likely to occur in the coating layer due to excessive drying of the base paint.

The paint used for forming the pattern layer is 30-40 parts by weight of main resin, 10-20% by weight of auxiliary resin, 3% by weight or less of colored artificial mica, 1-4% by weight of cobalt-ferrite-chromium black pigment, zinc- 2-4% by weight of iron-based blue pigment, 2-4% by weight of chromium-iron brown pigment, 1-3% by weight of ceramic yellow pigment, 0.2% by weight or less of silica antifoaming agent, 0.2% by weight or less of special acrylic antifoam, thixotropic regulator It is a paint for color steel plates which shows various patterns characterized by consisting of 0.3 weight% or less, 4-6 weight% of aromatic solvents, 2-3 weight% of aliphatic solvents, 30-35 weight% of ketone solvents, and 100 weight% in total.

When the thickness of the coating layer forming the pattern is less than 5 µm, the fading of the pigment due to UV transmission of sunlight cannot be suppressed, and thus, it does not exhibit suitable physical properties as an exterior color steel sheet.

On the contrary, if it exceeds 10 μm, problems such as nonuniformity of pattern formation and deterioration of adhesion appear.

Table 1 shows the specific weight content ratios (wt,%) of the constituents of the present invention with respect to the above-described base paint and the pattern layer paint.

The characteristics were evaluated only for corrosion resistance, weather resistance, chemical resistance, adhesiveness, heat shield temperature difference, and evaluated by adopting high weather resistant polyester resin and fluorine resin as representative resins.

 ◇ Corrosion resistance: After maintaining the specimen in the atmosphere of 35 ℃, 5% NaCl solution for 500 ~ 2000 hours, the evaluation results by the degree of swelling in the cutting plane and plane were as shown in Table 2.

◇ Weather resistance: The weather resistance test was performed after maintaining the QUV, a weathering tester for 500 to 2000 hours, to evaluate the weather resistance by measuring color change and gloss change.

 ◇ Chemical resistance: After dropping one drop or two drops of NaOH 5% solution and HCl 5% solution to the specimen, respectively, after 24 to 72 hours, the color change of the coating film surface was evaluated as shown in Table 4.

 ◇ Adhesiveness: 20 ℃, T-Bending bending test, tape test, the temperature of the front and back until the adhesive evaluation temperature reaches 80 ℃ was measured by the difference, the results are evaluated in Table 5 and It was like

 ◇ Heat shielding temperature difference: The difference between the initial and final values of the temperature difference between the front and back temperature at the temperature until the upper surface temperature does not rise after irradiating light with 250W infrared bulb on the front surface of the paint using heat shielding pigment Evaluated as.

HBU = total front temperature-initial front temperature

 The coated pattern steel sheet using the paint according to the present invention can provide various and colorful surfaces having a three-dimensional effect by using a coating paint method and a coating machine rather than ink printing, which is completely different from the conventional method as described above. By improving the corrosion resistance and durability of the first layer compared to the steel sheet, it is also possible to express a variety of patterns, it can be comprehensively applied to interior and exterior materials for building.

1 is a schematic diagram showing a cross section of the present invention product.

2 is an explanatory view briefly illustrating the use sprayer roll according to the present invention.

3 is an explanatory diagram of the arrangement of a gravure offset type printing roll in the case of supplying ink and printing.

4 is a schematic diagram showing a cross section of a conventional color-printed steel sheet.

Description of the main parts of the drawing

1. Base layer 2. Chromium coating layer 3. Undercoat layer

4. Base coating layer 5. Various pattern layers

Claims (3)

Chromatized film after alkali degreasing to remove foreign substances adhering to the surface by using base material, aluminum, hot-dip galvanized steel sheet, electro galvanized steel sheet, zinc-55% aluminum plated steel sheet, stainless steel sheet, etc. After the treatment process and coating the undercoat layer (3) of 5-15㎛ thickness and heat-dried at 200 ~ 220 ℃ to coat the undercoat layer and heat-dried the base paint using a shielding pigment to 210 ~ 250 ℃ A pattern layer forming paint prepared for the purpose of coating a dry coating layer having a thickness of 15 to 25 μm, maximizing a transfer rate so as to be suitable for forming a pattern layer after base coating, and maintaining a shape for a predetermined time until the pattern of the transferred pattern is dried. Heat-dried to 210 ~ 250 ℃ using to coat 5 ~ 10㎛ pattern coating layer, and to produce a color steel plate of various patterns by using a transfer method using a coating machine Method of manufacturing a colored steel sheet which is characterized The method of claim 1, wherein the steel sheet is used as a four-step coating of chromate coating, undercoat coating, base coating coating, and pattern printing layer coating of the steel plate base material by using a paint instead of a grabbed offset type printed steel sheet using ink. Method for producing a color steel sheet, characterized in that configured to be configured. The coating material used for forming the pattern layer of claim 1 is 30 to 40% by weight of the main resin, 10 to 20% by weight of the auxiliary resin, 3% by weight or less of the colored artificial mica, and 1 to 4% of the cobalt-ferrite-chromium black pigment. %, 2-4% by weight of zinc-iron blue pigment, 2-4% by weight of chromium-iron brown pigment, 1-3% by weight of ceramic yellow pigment, 0.2% by weight or less of silica defoamer, 0.2% by weight of special acrylic defoamer, food tropic (thixotropic) for color steel plates having various patterns, comprising 0.3 wt% or less, aromatic solvent 4-6 wt%, aliphatic solvent 2-3 wt%, ketone solvent 30-35 wt%, total 100 wt% varnish.