KR101778366B1 - Eco-friendly coating composition, coated steel having excellent corrosion resistance and fire retardant and method for manufacturing the same - Google Patents
Eco-friendly coating composition, coated steel having excellent corrosion resistance and fire retardant and method for manufacturing the same Download PDFInfo
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- KR101778366B1 KR101778366B1 KR1020150100589A KR20150100589A KR101778366B1 KR 101778366 B1 KR101778366 B1 KR 101778366B1 KR 1020150100589 A KR1020150100589 A KR 1020150100589A KR 20150100589 A KR20150100589 A KR 20150100589A KR 101778366 B1 KR101778366 B1 KR 101778366B1
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D1/00—Coating compositions, e.g. paints, varnishes or lacquers, based on inorganic substances
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/08—Anti-corrosive paints
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C28/00—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
- C23C28/04—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D only coatings of inorganic non-metallic material
Abstract
The present invention provides a coating composition comprising 28 to 31 wt% of colloidal silica, 23 to 25 wt% of phosphate, 25 to 32 wt% of ILLITE, 1 to 2 wt% of chromic anhydride and the balance pigment, , Mg 2 SiO 4 ), and a coating layer formed on the forsterite coating, wherein the coating layer provides a coated steel sheet comprising the coating composition described above, wherein the coated steel sheet has excellent corrosion resistance and flame retardancy It is possible to control the humidity according to the indoor environment. By using the above-mentioned coated steel sheet as a building material such as a duct and an art wall, it is possible to prevent allergic diseases such as sick house syndrome and to be harmless to the human body, It can be expected to have useful bio-effects and is environmentally friendly.
Description
TECHNICAL FIELD The present invention relates to a coated steel sheet used as a construction material such as a duct and an art wall, and more particularly, to an eco-friendly coating composition, a coated steel sheet and a method for producing the same, which are excellent in corrosion resistance and flame retardancy, .
The building material is formed on the inner wall, the bottom surface, and the outer wall of the building, respectively, and performs additional functions such as appearance beauty, heat insulation and waterproofing. However, there is a problem that formaldehyde, volatile organic compounds, and the like are continuously discharged from building materials, which adversely affects the human body such as various allergic diseases.
In particular, paints and construction materials made of synthetic resin have disadvantages in that various volatile components contained in paints after coating have been emitted for a long time and pollute the surrounding air, which is not environmentally friendly. In addition, in terms of mass production and cost, the use of building materials including chemicals is increasing, and the indoor air quality environment is getting worse.
Recently, as the quality of life has improved, the interest in the environment has been increasing. The concept of cleanliness of the indoor air has been highlighted. At the same time, the harmfulness of the human body caused by various building materials has been proved to be harmful to the human body. Materials are required.
Particularly, there is a demand for multi-functionalities such as art wall for decorating an indoor wall such as a living room of an apartment, and architectural materials such as a duct used for ensuring ventilation of a building, which have beneficial functions such as environmental friendliness, corrosion resistance and flame resistance.
The present invention provides an eco-friendly coating composition for a building material such as a duct and an art wall, a coated steel sheet, and a manufacturing method thereof.
According to an embodiment of the present invention, there is provided a method for producing a chromium-free chromium oxide film, which comprises 28 to 31 wt% of colloidal silica, 23 to 25 wt% of phosphate, 25 to 32 wt% of iodite, 1 to 2 wt% Thereby providing an environmentally friendly coating composition.
The phosphate may be at least one selected from the group consisting of magnesium phosphate, sodium phosphate, calcium phosphate, sodium monohydrogen phosphate, sodium dihydrogen phosphate and calcium dihydrogen phosphate.
The pigment may be at least one selected from the group consisting of iron oxide, cobalt and carbon powder.
According to another embodiment of the present invention, there is provided an electric steel sheet having a Forsterite (Mg 2 SiO 4 ) coating and a coating layer formed on the forsterite coating, wherein the coating layer comprises a corrosion- An eco-friendly coated steel sheet excellent in flame retardancy is provided.
The forsterite coating may have an illuminance (Ra) of 3 to 6 占 퐉.
The coating layer may have a thickness of 0.5 to 1 mm.
According to still another embodiment of the present invention, there is provided a method of manufacturing an electric steel sheet, comprising the steps of forming a coating layer by applying the above-mentioned coating composition on an upper surface of a forsterite coating film, and drying the coating layer to remove moisture, And obtaining an eco-friendly coated steel sheet excellent in corrosion resistance and flame retardancy.
And firing the coating layer from which the moisture has been removed.
The coating layer may have a coating amount of 20 to 40 g / m < 2 >.
The drying may be performed at a temperature of 500 to 700 ° C for 10 to 30 seconds.
The calcination may be performed at a temperature of 800 to 1050 DEG C for 20 to 80 seconds.
The coated steel sheet coated with the eco-friendly coating composition of the present invention is excellent in corrosion resistance and flame retardancy and has an effect of controlling the humidity according to the indoor environment. By using the coated steel sheet as a construction material such as a duct and an art wall, It is harmless to the human body by preventing allergic diseases, and it can be expected to have useful bio effect for the body because it is excellent in far-infrared radiation and is environmentally friendly.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a photograph of a cross section of an electric steel sheet on which a forester coating is formed.
2 is a photograph of the environmentally friendly coated steel sheet of the present invention.
3 to 5 are photographs of the results of the hygroscopicity, corrosion resistance and adhesion test of the examples.
Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. However, the embodiments of the present invention can be modified into various other forms, and the scope of the present invention is not limited to the embodiments described below.
The present invention relates to a coating composition and a coated steel sheet which are used as construction materials such as ducts and artwalls, and more particularly to a steel sheet having excellent corrosion resistance and flame retardancy and having an effect of controlling humidity according to an indoor environment. Duct and art wall to prevent allergic diseases such as sick house syndrome, so that harmful to the human body and excellent in far-infrared radiation activity can be expected to provide a useful bio-effect to the body, and an environmentally friendly coating composition, a coated steel sheet and its manufacture ≪ / RTI >
According to one embodiment of the present invention, there is provided a photosensitive composition comprising 28 to 31% by weight of colloidal silica, 23 to 25% by weight of phosphate, 25 to 32% by weight of iodite, 1 to 2% by weight of chromic anhydride, Thereby providing an environmentally friendly coating composition.
The eco-friendly coating composition may include colloidal silica, phosphate, ilite, chromic anhydride, and remainder pigment, and the coating composition is made of an inorganic material so that the coating composition exhibits flame retardancy that is difficult to burn. Therefore, when the coated steel sheet coated with the coating composition of the present invention is used as a construction material, there is an effect of delaying or stopping expansion of fire.
In addition, the coated steel sheet is excellent in corrosion resistance and has the effect of controlling the humidity according to the indoor environment due to the sunlight contained in the coating layer. Furthermore, since the materials contained in the coating composition are composed of natural minerals and harmless compounds to the human body, when a coated steel sheet is used as a construction material such as a duct and art wall, it prevents harmful diseases such as sick house syndrome, It is excellent in far-infrared radiation and can be expected to have a beneficial bio effect on the body and is eco-friendly.
The content of the colloidal silica is preferably 28 to 31% by weight. When the content of the colloidal silica is less than 28% by weight, hygroscopicity and corrosion resistance are weakened and the physical properties of the inorganic coating layer are remarkably decreased. When the content of the colloidal silica is more than 31% by weight, hygroscopicity is excessively increased.
The phosphate is preferably at least one selected from the group consisting of magnesium phosphate, sodium phosphate, calcium phosphate, sodium monohydrogen phosphate, sodium dihydrogen phosphate and calcium dihydrogen phosphate, and the content of phosphate is 23 to 25 wt% desirable. If the content of the phosphate is less than 23% by weight, the adhesion between the coating layer and the electrical steel sheet is lowered and the coating layer is peeled off, so that corrosion resistance may be significantly lowered. If the content is more than 25% by weight, The adhesion of the electric steel sheet is lowered, which causes a problem that the coating layer is peeled off, and the corrosion resistance may be weakened.
The ilite is formed when the mica is weathered to become finer and has a plate-like crystal form. It contains numerous pores and is excellent in hygroscopicity. Accordingly, the building material including Ilright can adjust the humidity according to the indoor environment. For example, when the indoor humidity is high, it absorbs moisture to lower the indoor humidity, and when the indoor humidity is low, So that the indoor humidity can be increased.
If the content is less than 25% by weight, hygroscopicity is weakened. If the content is more than 32% by weight, the viscosity of the coating composition may rapidly rise, rendering the coating impossible.
The anhydrous chromic acid is used to enhance the adhesion between the coating layer and the electrical steel sheet. After the coating layer is dried, it is present in the inorganic coating layer in the form of trivalent chromium. The amount of the chromic anhydride is preferably 1 to 2% by weight, and if the content is less than 1% by weight, the adhesion and the corrosion resistance are not affected. If the amount is more than 2% by weight, It is not desirable.
The pigment is not particularly limited as long as it is a material that determines the color of the coated steel sheet. For example, at least one selected from the group consisting of iron oxide, cobalt and carbon powder can be used. In addition, Can be used. FIG. 2 is a photograph of an eco-friendly coated steel sheet of the present invention. FIG. 2 (a) is a photograph of the coated steel sheet after preparing a coated steel sheet using iron oxide as a pigment for determining the color of the coated steel sheet. It can be seen that the coated steel sheet using iron oxide as pigment has a dark brown color.
On the other hand, FIG. 2 (b) is grayish with a coated steel sheet not containing pigments, and (c) and (d) are coated steel plates having a color of orange and deep colors, respectively, using cobalt as a pigment. The color difference between (c) and (d) can be represented by the difference in temperature during firing of the coating layer. As the firing temperature increases, the color becomes darker.
According to an embodiment of the present invention, there is provided an electric steel sheet having a Forsterite (Mg 2 SiO 4 ) coating and a coating layer formed on the forsterite coating, wherein the coating layer comprises a corrosion- An eco-friendly coated steel sheet excellent in flame retardancy can be provided.
An electric steel sheet is a steel sheet having a higher content of silicon than a general steel sheet, and is also called an electric steel sheet or a silicon steel sheet, and has excellent electrical and magnetic characteristics. The composition of the electrical steel sheet may include silicon (Si): 2.0 to 3.4% by weight, balance Fe and other impurities.
The manufacturing process of the electric steel sheet includes a step of applying an annealing separator to prevent sticking between materials during high-temperature annealing for decarburization and nitriding annealing and for secondary recrystallization formation. At this time, magnesium oxide (MgO), which is a main component of the coating agent, reacts with silicon (Si) contained in the steel material to form a forsterite coating on the steel sheet.
The forsterite coating usually has an effect of preventing fusion between a plate and a plate of a directional electric steel plate and giving tension to the plate, thereby reducing iron loss and imparting insulation to the material. In addition, since the forester coating is formed on the above-mentioned electric steel sheet, the primary corrosion resistance of the electric steel sheet can be ensured. The thickness of the electrical steel sheet is preferably 0.23 to 0.3 mm, and as the thickness of the electrical steel sheet is reduced, the properties of low iron and high magnetic properties can be improved.
Fig. 1 is a photograph (a) showing a cross section of an electric steel sheet on which a forester coating is formed and a photograph (b) showing an enlarged photograph of a forester coating. According to this, the forsterite coating formed on the electric steel sheet has a very rough cross section And a large number of irregularities are formed on the surface.
The coating layer of the eco-friendly coated steel sheet of the present invention can be formed on the upper surface of the forsterite coating having many unevenness. As a result, the adhesion between the electrical steel sheet and the coating layer can be increased by using a forsterite coating having many irregularities formed thereon as a binder.
The larger the roughness (Ra) of the steel sheet on which the forester coating is formed, the higher the adhesion between the steel sheet and the coating layer. However, it is preferably 3 to 6 탆, more preferably 4 to 5 탆. If the roughness is less than 3 탆, the adhesion between the steel sheet and the coating layer is lowered, so that the coating layer is cracked or peeled, moisture penetrates into the coating layer and it is difficult to secure corrosion resistance, and it may not be possible to control the composition such that the roughness of the forsterite coating exceeds 6 탆 .
If the thickness of the coating layer is less than 0.5 mm, the corrosion resistance of the coated steel sheet tends to be increased. If the thickness is more than 1 mm, the coating layer is cracked or peeled, and moisture penetrates into the coating layer, .
According to another embodiment of the present invention, there is provided an electric steel sheet having a forester coating, the method comprising: coating the above-mentioned coating composition on the forsterite coating to form a coating layer; and drying the coating layer to obtain a water- A method of manufacturing an eco-friendly coated steel sheet excellent in corrosion resistance and flame retardancy can be provided.
As shown in the photograph of the cross section of the electrical steel sheet in Fig. 1, a large number of irregularities are formed on the surface of the forsterite coating. Thus, the adhesion between the coating layer formed on the forsterite coating film and the electrical steel sheet is excellent.
When the coating composition is applied onto the forsterite coating, the coating amount is preferably 20 to 40 g / m 2 . When the coating amount is less than 20 g / m 2, the corrosion resistance of the coated steel sheet is heat-treated. When the coating amount exceeds 40 g / m 2 , the coating layer peels off due to a large variation in shrinkage of the coating layer and the forsterite coating during drying and firing.
The coating composition preferably comprises 28 to 31% by weight of colloidal silica, 23 to 25% by weight of phosphate, 25 to 32% by weight of iodite, 1 to 2% by weight of chromic anhydride and the balance pigment. Since the coating composition is made of an inorganic material, the coating composition exhibits flame retardancy which is difficult to be burned. Therefore, when the coated steel sheet of the present invention is used as a building material, there is an effect of delaying or stopping expansion of fire.
Further, the coating layer is excellent in corrosion resistance and has the effect of controlling the humidity according to the indoor environment due to the sunlight contained in the coating layer. Furthermore, since the materials contained in the coating composition are composed of natural minerals and harmless compounds to the human body, when a coated steel sheet is used as a construction material such as a duct and art wall, it prevents harmful diseases such as sick house syndrome, It is excellent in far-infrared radiation and can be expected to have a beneficial bio effect on the body and is eco-friendly.
It is preferable to form the coating layer on the forsterite coating and dry the coating layer. The drying is preferably carried out at a temperature of 500 to 700 ° C. for 10 to 30 seconds. If the drying temperature is lower than 500 ° C., moisture is left in the coating layer due to difficulty in complete drying. If the drying temperature is higher than 700 ° C., And peeling occurs, moisture penetrates into the coating layer, and it is difficult to secure corrosion resistance. If the drying time is less than 10 seconds, moisture is left in the coating layer because it is difficult to completely dry. If the drying time is more than 30 seconds, the coating layer is cracked or peeled due to excessive drying, and moisture penetrates into the coating layer, .
It is preferable that the coating layer is dried and then fired to ceramicize the coating layer. The firing is preferably performed at a temperature of 800 to 1050 캜 for 20 to 80 seconds. If the firing temperature is less than 800 캜, the coating layer is not ceramicized. If the firing temperature exceeds 1050 캜, the coating layer is cracked or peeled, It is difficult to secure corrosion resistance. If the baking time is less than 20 seconds, the coating layer is not ceramicized. If the baking time is more than 80 seconds, the coating layer is cracked or peeled, and moisture penetrates into the coating layer.
Hereinafter, the present invention will be described more specifically by way of specific examples. The following examples are provided to aid understanding of the present invention, and the scope of the present invention is not limited thereto.
Example
The coating compositions having the respective component contents shown in Table 1 below were stirred with a stirrer and then applied on top of the forsterite coating of the electric steel sheet. The coating amount was controlled to 30 g / m < 2 > The electric steel sheet on which the coating layer was formed was dried at 650 ° C for 12 seconds to remove moisture in the coating layer, and then fired at 900 ° C for 15 seconds to ceramicize the coating layer. After firing, the specimens were naturally cooled in the air to prepare a specimen. The specimens were subjected to hygroscopicity, corrosion resistance and adhesion test, and the far-infrared emissivity and radiant energy were measured. The results are shown in Table 1 below.
<Hygroscopicity Test>
After dropping water droplets vertically on the specimen, the shape of water droplets on the specimen was visually observed. At this time, as a result of the observation, when water droplets were absorbed (⊚), when water droplets remained, they were indicated by (∇), respectively.
<Corrosion resistance test>
5% of sodium chloride and 95% of pure water were blended and sprayed on the specimen in a salted form, and the degree of rust formation on the surface of the specimen after 24 hours was visually observed. At this time, when no rust was observed (?), 50% rust was generated (?), And when rust was generated as a whole, (?) Was written.
<Adhesion Test>
The specimens were subjected to 180 - degree bending (0 t bending), and the surface appearance was observed. At this time, as the observation result, when the peeling was 2%, the peeling was 5% (Δ) and when the peeling was 10% or more (∇) Respectively.
≪ Measurement of far-infrared ray emissivity and radiant energy &
Far Infrared Radiation The radiant energy of far infrared rays and radiant energy of coated steel sheet was measured at the wavelength range of 5 ~ 20 ㎛ according to the KS standard (KS L 2514 6.4) at Korea Institute of Construction Materials (Far Infrared Application Evaluation Center).
(W / m 2占 퐉)
As shown in Table 1, Examples 1 and 2, which satisfied the content range of the coating composition of the present invention, showed excellent results in hygroscopicity, corrosion resistance and adhesion test as compared with Comparative Examples 1 and 2. In addition, Examples 1 and 2 are higher in emissivity and radiant energy than Comparative Examples 1 and 2, and a bio effect useful for the body can be expected.
Fig. 3 is a photograph of the result of hygroscopicity test, Fig. 3 (a) is a hygroscopicity test result of Comparative Example 1, and Fig. 3 (b) is a hygroscopicity test result photograph of Example 1. Fig. According to this, in Comparative Example 1, it was confirmed that the shape of water droplets remained on the specimen and the hygroscopicity was due to heat, but in Example 1, it was confirmed that the specimen absorbs water droplets, and therefore, it is excellent in hygroscopicity. Accordingly, it has been confirmed that when the environmentally-friendly coated steel sheet of the present invention is used as a construction material such as a duct and an art wall, the humidity can be controlled according to an indoor environment.
4 (a) is a corrosion resistance test result of an electric steel sheet on which a coating layer is not formed, Fig. 3 (b) is a corrosion resistance test result of Comparative Example 2, and Fig. 4 ) Is a photograph of the corrosion resistance test result of Example 2. According to this, it was confirmed that rust occurred on the entire sheet of the steel sheet in which the coating layer was not formed, and in Comparative Example 2, it was confirmed that about 50% rust was generated. On the other hand, in Example 2, no rust was generated, and it was confirmed that the corrosion resistance was excellent.
5 is a photograph of the result of the adhesion test, FIG. 5 (a) is a result of the adhesion test of Example 1, and FIG. 5 (b) is a photograph of the adhesion test of Example 2. FIG. According to this, it was confirmed that Examples 1 and 2 hardly peeled off.
While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, It will be obvious to those of ordinary skill in the art.
Claims (11)
Wherein the pigment is at least one selected from the group consisting of iron oxide, cobalt and carbon powder, and is excellent in corrosion resistance and flame retardancy.
And a coating layer formed on the forsterite coating,
Wherein the coating layer comprises the coating composition of any one of claims 1 to 3, and is excellent in corrosion resistance and flame retardancy.
Wherein the forsterite coating has an Ra (Ra) of 3 to 6 占 퐉, and is excellent in corrosion resistance and flame retardancy.
Wherein the coating layer has a thickness of 0.5 to 1 mm and is excellent in corrosion resistance and flame retardancy.
And drying the coating layer to obtain a coating layer from which moisture has been removed. The method of manufacturing an eco-friendly coated steel sheet excellent in corrosion resistance and flame retardancy.
Further comprising the step of firing the coating layer from which the moisture has been removed, thereby producing an eco-friendly coated steel sheet excellent in corrosion resistance and flame retardancy.
Wherein the coating layer has a coating amount of 20 to 40 g / m 2 and is excellent in corrosion resistance and flame retardancy.
Wherein the drying is performed at a temperature of 500 to 700 캜 for 10 to 30 seconds, and the method is excellent in corrosion resistance and flame retardancy.
Wherein the firing is carried out at a temperature of 800 to 1050 캜 for 20 to 80 seconds, and wherein the firing is excellent in corrosion resistance and flame retardancy.
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| KR20240044561A (en) | 2022-09-28 | 2024-04-05 | 케이지스틸 주식회사 | Aqueous surface treatment composition for tin-plated steel sheet and tin-plated steel sheet and coating method for tin-plated steel sheet using the same |
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| CN112063205B (en) * | 2020-09-22 | 2021-11-16 | 中国南方电网有限责任公司超高压输电公司柳州局 | Inorganic corrosion-resistant coating and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| KR20240044561A (en) | 2022-09-28 | 2024-04-05 | 케이지스틸 주식회사 | Aqueous surface treatment composition for tin-plated steel sheet and tin-plated steel sheet and coating method for tin-plated steel sheet using the same |
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