JP3011385B2 - Colored polyolefin coated steel - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to steel structural members such as steel sheet piles, H-section steels, sectional steel walls, steel pipe piles, square steel pipe piles, steel pipe sheet piles and steel sheets used in the ocean, rivers, ports and the like. More particularly, the present invention relates to a colored polyolefin-coated steel material which is colored in various colors and has excellent weather resistance which simultaneously prevents cracking and fading of a colored layer due to light, particularly ultraviolet rays.

[0002]

2. Description of the Related Art A polyolefin coating such as a black polyolefin having excellent corrosion resistance is used as a conventional polyolefin-coated steel material. However, with the recent growing market needs for the aesthetics of urban landscapes, rivers, and harbor steel structures, development of polyolefin-coated steel materials that are colored in various colors, are in harmony with the environment, and have excellent anticorrosion properties are desired. I have. To meet such needs, a method of coating a steel material with a polyolefin to which various coloring pigments have been added has been proposed.

[0003]

However, in such a conventional steel material coated with a colored polyolefin, when exposed to ultraviolet rays for a long period of time, the surface of the colored polyolefin coating cracks and the corrosion resistance is impaired, and the color is reduced. Fading and aesthetics are spoiled. There have been proposals to add various hindered amine-based weathering agents and ultraviolet absorbers in order to prevent the generation of cracks and fading on the surface of the coating. However, simply adding these weathering additives will result in outdoor use for about 5 years, for example. In the exposure test, cracks are formed from the surface of the coating to impair the corrosion protection, and at the same time, significant fading occurs and the aesthetic appearance is impaired. As described above, it has been difficult for the conventional technology to simultaneously prevent the occurrence of surface cracks and fading of the coating.

[0004]

Means for Solving the Problems The inventors of the present invention have conducted intensive studies to solve the above-mentioned problems, and as a result, have found that the surface of a steel material subjected to a base treatment has a black color containing carbon black via a modified polyolefin adhesive. The inventors have found that the above-described problems can be solved by sequentially laminating a polyolefin, a specific two kinds of hindered amine-based weathering agents, and a colored polyolefin to which a colored pigment is added, and have accomplished the present invention.

That is, in the present invention, as shown in FIGS. 1 to 8, for example, it is necessary to have a beautiful appearance of a steel material 1 such as a steel plate, a steel sheet pile, an H-shaped steel, a sectional steel wall, a steel pipe pile, a square steel pipe pile, and a steel pipe sheet pile. Surface
The scale and the like are removed by blasting or the like, the chromate coating 2 and the epoxy primer layer 3 are sequentially laminated, and a base treatment is performed. % Of a black polyolefin layer 5, 0.1 to 10% by weight of a coloring pigment, 0.1 to 2% by weight of bis (2,2,6,6-tetramethyl-4-piperidyl) sebacate, and poly [｛ 6-
(1,1,3,3-tetramethylbutyl) imino 1,
3,5-triazine-2,4-diyl {(2,2,
6,6-tetramethyl-4-piperidyl) imino {hexamethylene} (2,2,6,6-tetramethyl-4-piperidyl) imino}] in an amount of 0.1 to 2% by weight. A polyolefin-coated steel material characterized by being laminated.

Hereinafter, the present invention will be described in detail. The steel material used in the present invention is a steel plate, a steel sheet pile, an H-section steel, a section steel for a continuous wall, a steel pipe pile, a square steel pipe pile, and a steel pipe sheet pile made of alloy steel such as carbon steel and stainless steel. In addition, in order to improve the corrosion resistance of the steel material, the surface thereof is plated with zinc, aluminum, chromium, or the like, alloy plating such as zinc-aluminum, zinc-nickel, or the like, or inorganic fine particles such as silica or titanium oxide for the plating or the alloy plating. Can also be used.

When the colored polyolefin-coated steel material of the present invention is manufactured, the surface treatment of the steel material 1 is performed by blasting the surface of the steel material with grit blasting or sand blasting to remove rust, and then applying chromate treatment and epoxy primer. The cured polyolefin adhesive is coated with a modified polyolefin adhesive layer 4 obtained by modifying the polyolefin with maleic anhydride or the like, and then the black polyolefin layer 5 and the colored polyolefin layer 6 of the present invention are coated. It is sufficient that the modified polyolefin adhesive layer 4 and the black polyolefin layer 5 are firmly laminated and coated on the surface of the coated steel material, and a conventionally known chromate treatment, epoxy primer, phosphate treatment, silane cup It is possible to use ring processing alone or in combination Kill.

[0008] The modified polyolefin adhesive layer 4 of the present invention,
Polyolefin used for forming the black polyolefin layer 5 and the colored polyolefin layer 6 is polyethylene, polypropylene, propylene, 1-butene,
A copolymer of α-olefin such as methyl-1-pentene, 1-hexene, 1-octene and ethylene is used. Examples of the modified polyolefin adhesive include a modified polyolefin obtained by modifying a polyolefin with an acid anhydride such as maleic anhydride, a modified polyolefin obtained by adding an elastomer such as ethylene-propylene rubber to a polyolefin, and a modified polyolefin modified by an acid anhydride. Although an adhesive obtained by diluting a polyolefin with a polyolefin is used, other polyolefin-based adhesives can also be used.

In order to simultaneously prevent fading and cracking of the colored polyolefin layer 6 due to ultraviolet rays, 0.1 to 5% by weight of carbon black is added to the black polyolefin layer 5 and the colored polyolefin layer 6 is 0.1 to 10% by weight of pigment, 0.1 to 2% by weight of bis (2,2,6,6-tetramethyl-4-piperidyl) sebacate
And poly [{6- (1,1,3,3-tetramethylbutyl) imino 1,3,5-triazine-2,4-diyl} (2,2,6,6-tetramethyl-4-piperidyl) ) Imino {hexamethylene} (2,2,6,6-tetramethyl-4-piperidyl) imino}]. Of these, when carbon black is added to the black polyolefin in the range of 0.1 to 5% by weight, the effect of preventing cracking and fading of the upper colored polyolefin layer is exhibited. As the color pigment to be added to the colored polyolefin, a preferred color tone is selected from the view of the colored polyolefin-coated steel material, and isoindolinone yellow (yellow), quinacridone red (red), perinone red (red), phthalocyanine blue (blue), and phthalocyanine green (Green) or other inorganic pigments such as titanium oxide (white), chromium oxide (green), iron oxide red (red), iron oxide (yellow), titanium yellow (yellow), or a mixture thereof I do. Polyolefins include:
When the addition amount of the above-mentioned coloring pigment is in the range of 0.1 to 10% by weight, the effect of preventing cracking and fading of the colored polyolefin layer is exhibited. If the amount of the pigment exceeds 10% by weight, the impact resistance of the coating deteriorates, which is not preferable.

[0010] The colored polyolefin of the present invention further includes:
In order to exhibit the effect of preventing crack generation and discoloration, it is necessary to add specific two kinds of hindered amine-based weathering agents in specific amounts. That is, the colored polyolefin contains bis (2,
0.1 to 2% by weight of 2,6,6-tetramethyl-4-piperidyl) sebacate and poly [{6- (1,1,3,
3-tetramethylbutyl) imino 1,3,5-triazine-2,4-diyl {(2,2,6,6-tetramethyl-4-piperidyl) imino {hexamethylene} (2,2,6, 6-tetramethyl-4-piperidyl)
0.1-2% by weight. As the above bis (2,2,6,6-tetramethyl-4-piperidyl) sebacate, Sanol LS770 manufactured by Sankyo Co., Ltd., and poly [{6- (1,1,3,3-tetramethylbutyl) imino) 1,3,5-triazine-2,4-diyl {(2,2,6,6-tetramethyl-4-piperidyl) imino {hexamethylene} (2,2,6,6-tetramethyl-4- As piperidyl) imino}], commercially available hindered amine-based weathering agents each of CHIMASSORB 944LD manufactured by Ciba Geigy Co., Ltd. can be used. When a sheet can be used for forming the black polyolefin layer 5 and the colored polyolefin layer 6, as shown in FIG. 9, the black polyolefin 5A and the colored polyolefin 6A are extruded from the two-layer T-die 7 in one layer. An electron beam crosslinked colored / black polyolefin laminated sheet formed into a two-layer sheet 9 by a sheet forming roll 8 and crosslinked by irradiating an electron beam from the surface is used.

Next, the method for producing the colored polyolefin-coated steel material of the present invention will be described with reference to a polyolefin-coated steel sheet pile as an example. First, as shown in FIG. 9, the electron beam crosslinked colored / black polyolefin laminate sheet has a black polyolefin layer 5 as a lower layer and a colored polyolefin layer 6 as an upper layer.
Are laminated and extruded from a two-layer T-die into a two-layer sheet to form a colored / black polyolefin laminated sheet 9. Next, an electron beam is irradiated from the surface of the colored / black polyolefin laminated sheet to produce an electron beam crosslinked colored / black polyolefin laminated sheet. Grit blasting is applied to the mountain face or valley face of the steel sheet pile, and a chromate treatment agent is applied and baked. Next, an epoxy primer is applied to the surface, heated and cured, and the powder of the modified polyolefin adhesive is immediately electrostatically coated and melted. In the coating of the mountain face of the steel sheet pile, a steel sheet pile having the mountain face coated with a modified polyolefin adhesive layer in a molten state was used as shown in FIG.
As shown in the figure, the electron beam crosslinked colored / black polyolefin laminate sheet 9 of the present invention is pressure-bonded to the surface thereof by the pressure roll 12 of the web while being moved by the transport roll 11 and the transport table 10, and then the auxiliary roll 13, and after being successively pressed by the pressure rolls 14 and 15 of the flange portion,
After cooling with water, the colored polyolefin-coated steel sheet pile of the present invention shown in FIG. 2 is obtained. In addition, in the coating of the valley surface of the steel sheet pile, the steel sheet pile coated with the modified polyolefin adhesive layer in a molten state,
As shown in FIG. 11, the transport roll 11 and the transport table 1
While moving at 0, the electron beam crosslinked colored / black polyolefin laminated sheet 9 of the present invention is pressure-bonded to the surface thereof with the pressure roll 16 of the web portion, then the auxiliary roll 17, the pressure rolls 18 and 19 of the flange portion, and the nail. After being pressure-bonded sequentially by the pressure-bonding rolls 20, the water-cooling is performed to obtain the colored polyolefin-coated steel sheet pile of the present invention shown in FIG. As a method of applying the chromate treatment agent, a conventionally known method such as roll application, brush application, and ironing application using various brushes can be used. As a method for applying the epoxy primer, a conventionally known method such as spray coating, ironing with a rubber ring or a rubber spatula can be used. A method in which the modified polyolefin adhesive is previously laminated with an electron beam crosslinked colored / black polyolefin laminated sheet and the laminated sheet is coated can also be used.

In the colored polyolefin-coated H-section steel of the present invention shown in FIG. 4, the entire surface of the H-section steel 1 is sandblasted, and a chromate treatment agent 2 is applied and baked. Next, an epoxy primer 3 is applied to the surface and heated and cured, and then a powder 4 of a modified polyolefin adhesive is sprayed and melted on the surface. Next, after spraying the black polyolefin powder 5 on the surface thereof, the colored polyolefin powder 6 of the present invention is sprayed to obtain the colored polyolefin-coated H-section steel of the present invention.

[0013] In the colored polyolefin-coated steel wall section of the present invention shown in Fig. 5, the entire surface of the steel wall section 1 is sandblasted, and a chromating agent 2 is applied and baked. Next, an epoxy primer 3 is applied to the surface and heated,
After curing, the surface is sprayed with powder 4 of a modified polyolefin adhesive, and then powder 5 of a black polyolefin.
Spray. On the surface of the wall where the design of the surface is required,
The colored polyolefin powder 6 of the present invention is sprayed to obtain a colored polyolefin-coated steel wall section for the continuous wall according to the present invention.

In the colored polyolefin-coated steel pipe pile of the present invention shown in FIG. 6, the outer surface is grit blasted and the chromate treatment agent 2 is applied and heated and baked while rotating the steel pipe 1 in a spiral manner. Then, the surface is spray-coated with an epoxy primer 3 and heated and cured, and then the modified polyolefin adhesive powder 4 is coated on the surface.
Is electrostatically coated and melted by the heat of the steel pipe, and then the black polyolefin 5 and the colored polyolefin 6 of the present invention are extruded and coated in a sheet form from the two-layer T-die into a two-layer unit, and the colored polyolefin-coated steel pipe of the present invention is coated. Get the stake.

In the colored polyolefin-coated square steel pipe pile according to the present invention shown in FIG. 7, the outer surface is grit blasted and a chromate treating agent 2 is applied and heated and baked while the square steel pipe 1 is transferred and conveyed by a transfer table. Next, the surface is spray-coated with an epoxy primer 3 and heated and cured. After that, powder 4 of a modified polyolefin adhesive is electrostatically coated on the surface and melted by the heat of a square steel pipe. The colored polyolefin 6 of the present invention is extrusion-coated from a square die into a rectangular tube to obtain a colored polyolefin-coated square steel pipe pile according to the present invention.

In the colored polyolefin-coated steel pipe sheet pile according to the present invention shown in FIG. 8, the outer surface of the steel sheet pile 1 is sandblasted, and a chromate treatment agent 2 is applied and baked. Next, an epoxy primer 3 is applied to the surface and heated,
After curing, the surface is sprayed with powder 4 of the modified polyolefin adhesive, and then the powder 5 of black polyolefin is sprayed. Next, the colored polyolefin powder 6 of the present invention is thermally sprayed to obtain the colored polyolefin-coated steel sheet pile according to the present invention.

The colored polyolefin-coated steel material of the present invention comprises:
As shown in FIGS. 1 to 8, the surface of steel material 1 such as a steel plate, a steel sheet pile, an H-section steel, a shape steel for a continuous wall, a steel pipe pile, a square steel pipe pile, a steel pipe sheet pile, etc., is required to be scaled by blast treatment or the like. The chromate coating 2 and the epoxy primer layer 3 are sequentially laminated to perform a base treatment, and the surface thereof is coated with carbon black through a modified polyolefin adhesive layer 4 for 0.1 to 0.1%.
5% by weight of a black polyolefin layer 5, 0.1 to 10% by weight of a coloring pigment, 0.1 to 2% by weight of bis (2,2,6,6-tetramethyl-4-piperidyl) sebacate, [{6- (1,1,3,3-tetramethylbutyl) imino 1,3,5-triazine-2,4-diyl} (2,2,6,6-tetramethyl-4-piperidyl) imino A polyolefin-coated steel material characterized in that a colored polyolefin layer 6 containing {hexamethylene {(2,2,6,6-tetramethyl-4-piperidyl) imino}] in an amount of 0.1 to 2% by weight is sequentially laminated. is there. The chromate film 2 has a total chromium adhesion amount of 200 to 15
00 mg / m ² adhesion amount, epoxy primer coating 3 is 10
The modified polyolefin adhesive layer 4 has a thickness of 100 to 600 μm, the black polyolefin layer 5 has a thickness of 1 to 5 mm, and the colored polyolefin layer 6 has a thickness of 0.5 to 5 μm.
Good results are obtained with a thickness of mm.

[0018]

The present invention will be described below with reference to examples. Example 1 A mountain face of a steel sheet pile (FSPIII type) was grit blasted to remove rust, and a chromate treatment agent was applied to the mountain face so that the total amount of chromium adhered was 600 mg / m ² , and heated to 160 ° C. Baked. While transferring and conveying the chromated steel sheet pile with a table roller, an epoxy primer was spray-coated on the surface so as to have a thickness of 50 μm, and was cured by heating to 190 ° C. by high-frequency induction heating. Next, a powder of a maleic anhydride-modified polyethylene adhesive was electrostatically coated on the surface so as to have a thickness of 300 μm, and the electron beam crosslinked colored / black polyethylene laminated sheet of the present invention (colored polyethylene layer A colored polyethylene-coated steel sheet pile of the present invention (coated steel material number 1 in Table 1) was produced by coating with a thickness of 0.5 mm and a black polyethylene layer having a thickness of 1.0 mm. The coated polyolefin of the electron beam cross-linked colored / black polyethylene laminated sheet contains 0.1% by weight of phthalocyanine green as a coloring pigment and bis (2,2,6,6-tetramethyl-4- as a hindered amine weathering agent. 0.1% by weight of Sanol LS770 (piperidyl) sebacate manufactured by Sankyo Co., Ltd. and poly [@ 6- (1,1,1)
3,3-tetramethylbutyl) imino 1,3,5-triazine-2,4-diyl {(2,2,6,6-tetramethyl-4-piperidyl) imino {hexamethylene} (2,2, 6,6-tetramethyl-4-piperidyl)
CHIMAS manufactured by Nippon Ciba-Gaiky Inc.
SORB944LD was added in an amount of 0.1% by weight. Further, 0.1% by weight of carbon black was added to black polyethylene. As a comparative example, a colored polyethylene-coated steel sheet pile manufactured without laminating black polyethylene on an electron beam crosslinked colored polyethylene sheet (coated steel material number 12 in Table 3)
Was manufactured. These electron beam crosslinked colored polyethylene-coated steel sheet piles were cut to a length of 1 m and subjected to an outdoor exposure test. After the exposure test for 7 years, the results of examining the color difference of the coated surface and the occurrence of cracks on the surface are shown in Tables 4 and 5. From the results of Tables 4 and 5, the colored polyethylene-coated steel sheet pile of the present invention in which the black polyethylene and the colored polyethylene of the present invention were laminated and coated was compared with the colored polyethylene-coated steel sheet pile of the comparative example in which only the colored polyethylene was coated. There is no change in color difference or cracks, and it has excellent anticorrosion properties and aesthetic appearance.

[Table 1]

[Table 2]

[Table 3]

[Table 4]

[Table 5]

Example 2 Content of carbon black added to black polyethylene of Example 1, phthalocyanine green, Sanol LS770 and CHIMASSOR added to colored polyethylene
The amount of B944LD added was changed as shown in Tables 1 and 2, to produce an electron beam crosslinked colored polyethylene-coated steel sheet pile of the present invention (coated steel material numbers 2 to 9 in Tables 1 and 2). As comparative examples, phthalocyanine green and SANOL L
Electron beam cross-linked colored polyethylene-coated steel sheet piles (coated steel material numbers 13 to 16 in Table 3) were produced using colored polyethylene laminated on black polyethylene in which the addition amounts of S770 and CHIMASSORB 944LD were out of the range of the present invention. Table 4 shows the results of subjecting these electron beam crosslinked colored polyethylene-coated steel sheet piles to the same outdoor exposure test as in Example 1.
To Table 5 below. From the results of Tables 4 and 5, the electron beam crosslinked polyethylene-coated steel sheet pile obtained by laminating and coating black polyethylene and colored polyethylene satisfying the constitutional requirements of the present invention has no change in color difference or cracks, and has excellent corrosion resistance. Combine aesthetics.

Example 3 Grit blasting was performed while rotating the outer surface of a steel pipe (SGP outer diameter 200 A × length 5 m) in a spiral shape.
A chromate treatment agent is applied to the surface, and the total chromium deposition amount is 600.
mg / m ² , apply iron with a brush and apply to 160 ° C
Then, the surface was baked by heating, and the surface thereof was further spray-coated with an epoxy primer so as to have a thickness of 50 μm, cured, and subjected to a base treatment. Next, a maleic anhydride-modified polyethylene adhesive, black polyethylene (addition amount of carbon black is 2.5%) and colored polyethylene (1% by weight of phthalocyanine green as a coloring pigment, 0.5% by weight of titanium yellow, and titanium oxide 1% by weight and 0.4% by weight of SANOL LS770 with CHIM
ASSORB 944LD (0.4% by weight added) was extruded from a three-layer T-die so as to have a thickness of 0.25 mm, 1 mm and 2 mm. No. 2) was obtained.
This colored polyethylene-coated steel pipe pile was cut to a length of 1 m and subjected to an outdoor exposure test. After a 7 year exposure test,
Table 4 shows the results of examining the color difference on the coated surface and the occurrence of cracks on the surface. From the results in Table 4, only when the black polyolefin and the colored polyethylene satisfying the constitutional requirements of the present invention are laminated and coated, the colored polyethylene-coated steel pipe pile has no change in color difference or cracks, and has both excellent corrosion resistance and aesthetic appearance. .

Example 4 H-section steel (height: 125 mm × side length: 125 mm × maximum thickness: 9)
mm) surface is sand-blasted to remove rust, and a chromate treatment agent is applied to the surface so that the total chromium deposition amount is 600 mg / m ^2.
And baked by heating to 160 ° C. An epoxy primer was spray-coated on the surface of the chromate-treated H-section steel so as to have a thickness of 50 μm, and was cured. Then, a powder of a maleic anhydride-modified ethylene-1-butene copolymer adhesive is sprayed on the surface so as to have a thickness of 400 μm, and black ethylene-1-butene is coated on the surface so as to have a thickness of 1 mm. A powder of a copolymer (addition amount of carbon black was 2.5%) was sprayed. Subsequently, the colored ethylene-1-one of the present invention is coated on the surface so that the film thickness becomes 2 mm.
Butene copolymer (containing 1% by weight of phthalocyanine blue, 1% by weight of chromium oxide and 1% by weight of titanium oxide, 0.6% by weight of Sanol LS770 and CHI
Massorb 944LD (0.6% by weight added) was sprayed to produce a colored ethylene-1-butene copolymer-coated H-section steel (coated steel material number 11 in Table 2) of the present invention. This colored ethylene-1-butene copolymer-coated H-section steel is 1 m long.
And subjected to an outdoor exposure test. After a 7-year exposure test, the results of examining the color difference on the coated surface and the occurrence of cracks on the surface are shown in Table 4. From the results shown in Table 4, the black ethylene-1-butene copolymer of the present invention and the colored ethylene-1
The colored ethylene-1-butene copolymer-coated H-section steel of the present invention in which the butene copolymer is laminated and coated has no change in color difference or occurrence of cracks, and has both excellent anticorrosion properties and aesthetic appearance.

[0022]

According to the present invention, as apparent from the above examples, a black polyolefin layer containing carbon black is provided on the surface of a steel material subjected to a base treatment via a modified polyolefin adhesive layer, Pigments, screws (2, 2,
6,6-tetramethyl-4-piperidyl) sebacate and poly [{6- (1,1,3,3-tetramethylbutyl)]
Iminnow 1,3,5-triazine-2,4-diyl
｛(2,2,6,6-tetramethyl-4-piperidyl)
The colored polyolefin-coated steel material of the present invention, in which a colored polyolefin layer 6 containing imino {hexamethylene {(2,2,6,6-tetramethyl-4-piperidyl) imino}] is laminated and coated, is exposed to ultraviolet light in sunlight. Since the occurrence of cracks and fading on the surface of the colored polyolefin coating can be prevented at the same time, it has both unprecedented excellent corrosion resistance and aesthetic appearance.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a steel material of the present invention having a surface coated with a black polyolefin and a colored polyolefin in a laminated manner.

FIG. 2 is a cross-sectional view showing a steel sheet pile of the present invention in which a black polyolefin and a colored polyolefin are laminated and coated on a mountain surface.

FIG. 3 is a cross-sectional view showing a steel sheet pile of the present invention in which a black polyolefin and a colored polyolefin are laminated and coated on a valley surface.

FIG. 4 is a cross-sectional view showing an H-section steel of the present invention having a surface coated with a black polyolefin and a colored polyolefin in a laminated manner.

FIG. 5 is a cross-sectional view showing a sectional wall steel of the present invention in which one surface is laminated and coated with black polyolefin and colored polyolefin.

FIG. 6 is a cross-sectional view showing a steel pipe pile according to the present invention in which a black polyolefin and a colored polyolefin are laminated and coated on the outer surface.

FIG. 7 is a cross-sectional view showing a square steel pipe pile of the present invention in which the outer surface is coated with black polyolefin and colored polyolefin in a laminated manner.

FIG. 8 is a cross-sectional view showing a steel pipe sheet pile of the present invention in which an outer surface is coated with black polyolefin and colored polyolefin in a laminated manner.

FIG. 9 is a perspective view showing an example of a method for producing a colored / black polyolefin laminated sheet of the present invention.

FIG. 10 is a perspective view showing an example of a method for applying a laminated coating of a black polyolefin and a colored polyolefin of the present invention on a mountain face of a steel sheet pile.

FIG. 11 is a perspective view showing an example of a method of applying a laminated coating of a black polyolefin and a colored polyolefin of the present invention to a valley surface of a steel sheet pile.

[Explanation of symbols]

1 Steel material, such as steel plate, steel sheet pile, H-section steel, steel wall pile, steel pipe pile, square steel pipe pile, steel pipe sheet pile, etc. which has been subjected to blast treatment 2 Chromate coating 3 Epoxy primer coating or epoxy primer 4 Modified polyolefin adhesive layer Or modified polyolefin adhesive 5 black polyolefin layer or black polyolefin powder 6 colored polyolefin layer or colored polyolefin powder 7 two-layer T-die 8 sheet forming roll 9 two-layer sheet or colored / black polyolefin laminated sheet 10 transport table 11 transport Roll 12 Crimping roll 13 Auxiliary roll 14 Crimping roll 15 Crimping roll 16 Crimping roll 17 Auxiliary roll 18 Crimping roll 19 Crimping roll 20 Crimping roll

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-4-78531 (JP, A) JP-A-3-290239 (JP, A) JP-A-63-125545 (JP, A) (58) Field (Int.Cl. ⁷ , DB name) B32B 15/08 103 B32B 7/02 103 B32B 7/12 B32B 27/18 B32B 27/20

Claims (1)

(57) [Claims] 1. A coated steel material in which a black polyolefin layer and a colored polyolefin layer are sequentially laminated on a surface of a base material-treated steel material via a modified polyolefin adhesive layer, wherein the black polyolefin layer contains 0.1 to 5% by weight of carbon black. The colored polyolefin layer contains 0.1 to 10% by weight of a coloring pigment and 0.1 to 2% by weight of bis (2,2,6,6-tetramethyl-4-piperidyl) sebacate.
And poly [{6- (1,1,3,3-tetramethylbutyl) imino 1,3,5-triazine-2,4-diyl} (2,2,6,6-tetramethyl-4-piperidyl) ) Imino {hexamethylene} (2,2,6,6-tetramethyl-4-piperidyl) imino}] in an amount of 0.1 to 2% by weight.