JPH05247960A - Two-layered colored anticorrosive cocered steel sheet pile - Google Patents

Abstract

PURPOSE:To raise the colorfulness of a steel sheet pile by a method in which the outer surface (projected face) of a steel sheet pile subjected to base treatments is covered with an electron beam cross-linked colored polyolefin layer as anticorrosive layer through a modified polyolefin adhesive, and the outer surface is further subjected to a reforming treatment and laminated with color paint films. CONSTITUTION:The outer surface (projected face) of a steel sheet pile 1 is subjected to a blasting treatment to remove rust, and laminated with a chromate film 2 and an epoxy resin primer layer 3 in order for base treatments. The surface is further subjected to a surface reforming treatment through a modified polyolefin adhesive layer 4, containing four components, a specific hindered amine UV stabilizer, a benzotriazole UV absobent, a phenolic antioxidant, and a colorant, for preventing surface deterioration by UV. The surface is further laminated with an electron beam cross-linked colored polyolefin layer 5 treated by flame to keep the concentration of oxygen at 10% or more and then with colored paint films 6 such as fluororesin paint. The colorfulness of the sheet pile 1 can thus be raised.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heavy anticorrosion coated steel sheet pile for use in steel structures used in coasts, rivers, harbors, etc.
More specifically, by laminating a colored paint on the colored polyolefin coating of various colors on the outer surface of the heavy anticorrosion coating,
The present invention relates to a heavy anticorrosion coated steel sheet pile, which has an extremely excellent color property and is aesthetically pleasing, and which is excellent in prevention of light deterioration between the colored coating film and the heavy anticorrosion coating and also in water resistant adhesion.

[0002]

2. Description of the Related Art A conventional polyolefin-coated steel material, for example, a polyolefin-coated steel sheet pile, is coated with black polyethylene having excellent weather resistance and corrosion resistance. However, due to the recent increasing market needs for aesthetic landscapes of steel structures such as rivers, harbors, and other urban landscapes, heavy-duty anti-corrosion coated steel sheet piles that are colored in various colors, are in harmony with the environment, and have excellent weather resistance. Development is desired. To meet such needs, for example, as shown in Japanese Patent Application No. 02-221715 in FIG. 3, a fluorine-based paint coating film having various colors is formed on the surface of a black polyolefin-coated steel material having an outer surface subjected to corona discharge treatment. There is a heavy anticorrosion coated steel material that is sequentially laminated. In the figure, 7 is a steel sheet pile, 8 is a chromate treatment agent coating layer,
9 is an epoxy primer layer, 10 is a modified polyolefin adhesive layer, 11 is a 0.05 to 5.0% antioxidant, and the surface has a "wetting index (surface tension)" of 36 dy.
An electron beam crosslinked colored polyolefin that has been subjected to a corona discharge treatment so as to have a ne / cm or more, 12 indicates a urethane primer layer, and 13 indicates a colored fluorine coating layer.

[0003]

In the polyolefin generally used for heavy-duty anticorrosion coated steel materials, since carbon black having excellent weather resistance is used, the polyolefin becomes black, and when coated with a colored paint, light is not emitted. There is a problem in that excellent texture, depth of color, and chromaticity cannot be realized if the material penetrates the paint film. Further, in the conventional electron beam cross-linked polyolefin containing only an antioxidant, the electron beam cross-linked polyolefin is subjected to sunlight irradiation in the tidal part and repeated immersion in water, and in a state where the surface of the polyolefin coating is photo-deteriorated. There is a problem in that the adhesiveness of the paint is reduced and peeling of the paint coating film is likely to occur because the adhesion deterioration of the polyolefin and the paint due to the entry of water into the adhesive interface cannot be sufficiently suppressed.

[0004]

Means for Solving the Problems As a result of intensive studies to solve the above problems, the present inventors have found that a polyolefin coating under a paint film is colored with a coloring pigment in the same color as the paint or in a different color. Excellent color is obtained, and further,
It was found that by adding an additive, good paint adhesion in the tidal zone can be obtained. As a result, the crests or troughs of the steel sheet pile subjected to the base treatment, the specific hindered amine-based UV stabilizers bonded via the modified polyolefin adhesive layer, benzotriazole-based UV absorbers, phenolic antioxidants, coloring The surface of the electron beam crosslinked colored polyolefin layer containing four components of the pigment and subjected to flame treatment or corona discharge treatment so that the surface has an oxygen concentration of 10% or more, a fluorine-based coating material of various colors, acrylic-
The inventors have found that the above-mentioned problems can be solved by sequentially laminating colored paint coating films such as silicone-based paints and acrylic-urethane-based paints, resulting in the present invention.

That is, according to the present invention, as shown in FIG. 1, after removing rust such as blast treatment on the mountain surface of the steel sheet pile 1, a chromate film 2 and an epoxy primer layer 3 are sequentially laminated and subjected to a base treatment for modification. Through the polyolefin adhesive layer 4, the outermost layer contains four components of a specific hindered amine-based UV stabilizer, benzotriazole-based UV absorber, phenolic antioxidant, and color pigment, and the surface has an oxygen concentration of 10%.
On the electron beam cross-linking colored polyolefin layer 5 which has been subjected to the flame treatment or the corona discharge treatment as described above, the coloring paint coating film 6 of various colors such as a fluorine-based paint, an acrylic-silicone paint, an acrylic-urethane-based paint, etc. A two-layer colored heavy anticorrosion coated steel sheet pile characterized by being sequentially laminated, and FIG.
As shown in, after removing the rust such as blast treatment on the valley surface of the steel sheet pile 1, the chromate film 2 and the epoxy primer layer 3 are sequentially laminated and subjected to the base treatment, and the modified polyolefin adhesive layer 4 is applied to the outermost layer. It contains four components of a specific hindered amine UV stabilizer, benzotriazole UV absorber, phenolic antioxidant, and color pigment, and flame treatment or corona discharge treatment is performed so that the surface has an oxygen concentration of 10% or more. On the electron beam cross-linking colored polyolefin layer 5 which has been subjected to the coloring, a colored paint coating film 6 of various colors such as a fluorine-based paint, an acrylic-silicone paint, an acrylic-urethane-based paint, etc.
It is a two-layer colored heavy anticorrosion coated steel sheet pile characterized by being sequentially laminated. Hereinafter, the present invention will be described in detail.

The steel sheet pile used in the present invention is a steel sheet pile made of alloy steel such as carbon steel and stainless steel. Also, for the purpose of improving the corrosion resistance of the steel sheet pile, zinc on the surface of the steel sheet pile,
Aluminum, nickel plating, etc., zinc-iron, zinc-aluminum, zinc-nickel-cobalt, etc. alloy plating, or silica on the plating or alloy plating,
It is possible to use those subjected to dispersion plating or the like in which inorganic fine particles such as titanium oxide are dispersed.

When the double-layered colored heavy-corrosion-proof coated steel sheet pile of the present invention is manufactured, the peaks or valleys of the sheet pile are blasted by grid blasting, sand blasting or the like to remove rust, and then a chromate treatment agent is applied and baked. .. Next, apply an epoxy primer to the surface, heat and cure it to perform surface treatment, and immediately, apply a modified polyolefin adhesive obtained by modifying polyolefin with maleic anhydride etc. by electrostatic powder coating and melt it, and then on the surface. The electron beam crosslinked colored polyolefin sheet of the present invention is attached, or the electron beam crosslinked colored polyolefin-modified polyolefin laminate sheet in which an adhesive layer is preliminarily laminated is attached, and after water cooling, its surface is modified by flame or corona discharge treatment. Quality and paint with colored paint. From the gist of the present invention, it is sufficient that the coated steel sheet pile is firmly laminated and coated with the electron beam cross-linking colored polyolefin and the colored paint layer on the crest surface or the trough surface thereof. A primer, a phosphate treatment, a silane coupling agent or the like is used alone, or a combination of these base treatments is used.

The polyolefin used for forming the modified polyolefin adhesive layer and the electron beam cross-linking colored polyolefin layer of the present invention includes polyethylene, polybutene, or ethylene and propylene, 1-butene, 1-pentene, 4
A copolymer with an α-olefin such as -methyl-1-pentene, 1-hexene, 1-octene is used.

As the modified polyolefin adhesive, a modified polyolefin obtained by modifying a polyolefin with an acid anhydride such as maleic anhydride, a modified polyolefin prepared by adding an elastomer such as ethylene-propylene rubber to a polyolefin, or a modified polyolefin, or Adhesives obtained by diluting these modified polyolefins with polyolefins are used, but polyolefin-based adhesives other than these can also be used as long as strong adhesion is possible.

The electron beam cross-linked colored polyolefin layer is for preventing the deterioration of the surface layer due to the surface modification treatment, the deterioration of the surface layer due to the ultraviolet rays passing through the coating film, and the reduction of the adhesive force of the coating film due to water. , Four specific hindered amine UV stabilizers, benzotriazole UV absorbers, phenolic antioxidants, and color pigments are added as essential components.

As the hindered amine-based ultraviolet stabilizer added to the electron beam crosslinked colored polyolefin layer, poly [{6- (1,1,3,3-tetramethylbutyl) imino-1,3,5-triazine-2, 4-jiil}
{(2,2,6,6-tetramethyl-4-piperidyl)
Imino} hexanemethylene {(2,2,6,6-tetramethyl-4-pipedyl) imino}] (see Chemical formula 1) or
N, N'-bis (3-aminopropyl) ethylenediamine-2,4-bis [N-butyl-N- (1,2,2,2
6,6-Pentamethyl-4-piperidyl) amino] -6
-Chloro-1,3,5-triazine condensate (see Chemical formula 2)
Of 0.2-2.0 wt% and bis- [2,2,6,6-
It is most effective to add tetramethyl-4-piperidinyl] sebacate (see Chemical formula 3) in a mixed proportion of 0.1 to 0.6 wt%.

As the benzotriazole type ultraviolet absorber, 2- (3-t-butyl-5-methyl-2-hydroxyphenyl) -5-chlorobenzotriazole (see Chemical formula 4) or 2- (3,5 -Di-t-butyl-2-hydroxyphenyl) -5-chlorobenzotriazole (see Chemical formula 5) or 2- (3,5-di-t-amyl-2-hydroxyphenyl) benzotriazole (see Chemical formula 6) 0.1 to 1.0 wt% is added for use.

As the phenolic antioxidant, pentaerythrityl-tetrakis [3- (3,5-di-t-butyl-4-hydroxyphenyl) propionate] (see Chemical formula 7) or octadecyl-3- (3 , 5-di-t-
Butyl-4-hydroxyphenyl) propionate (see Chemical formula 8), or N, N'-hexamethylenebis (3,5
-Di-t-butyl-4-hydroxy-hydrocinnamamide) (see Chemical formula 9), or 1,3,5-trimethyl-2,
0.01% of 4,6-tris (3,5-di-t-butyl-4-hydroxybenzyl) benzene (see Chemical formula 10) is used.
Add 1.0 wt% and use.

The structures of the aforementioned hindered amine UV stabilizers (Chemical formulas 1 to 3), benzotriazole UV absorbers (Chemical formulas 4 to 6) and phenolic antioxidants (Chemical formulas 7 to 10) are shown below.

[0015]

[Chemical 1]

[0016]

[Chemical 2]

[0017]

[Chemical 3]

[0018]

[Chemical 4]

[0019]

[Chemical 5]

[0020]

[Chemical 6]

[0021]

[Chemical 7]

[0022]

[Chemical 8]

[0023]

[Chemical 9]

[0024]

[Chemical 10]

As the coloring pigment, generally commercially available iron oxides such as titanium oxide, titanium yellow and iron black, lead oxides such as yellow lead, metal oxides such as cobalt blue and cobalt green, and inorganic pigments such as dark blue and cadmium. , Phthalocyanine Green, Phythalocyanine Blue, Quinacridone Red, Perylene Red, Perinone Orange, Isoindolinone Yellow, and other organic pigments, and carbon black are used, and one or more of these pigments are mixed and toned. 0.2 to 20.0 wt% is added.

In the case where one of these components is lacking, the surface layer deteriorates and the adhesive force with the coating material decreases under the condition that long-term ultraviolet irradiation and submersion are combined. Further, when the amount exceeds the above range, the bleed-out of the additive becomes remarkable, so that the treatment effect when the surface modification is performed tends to be insufficient.

Next, the surface modification treatment applied to the electron beam crosslinked colored polyolefin coated surface of the electron beam crosslinked colored polyolefin coated steel sheet pile will be described. The electron beam cross-linking colored polyolefin has almost no oxidation-inducing group which is a polar group on the surface layer (about 5% within several nm of the surface layer), so that it does not adhere even if a colored coating material is applied. Therefore, it is necessary to modify the surface to introduce a polar group. As the surface modification treatment, it is necessary to use flame treatment or corona discharge treatment to introduce 10% or more of oxygen into several nm of the surface layer of the polyolefin so as to have adhesiveness with the colored coating material. The introduction amount of the polar group on the surface is simply quantified using an analysis method such as ESCA. Further, the surface modification treatment may use another treatment method as long as sufficient polar groups can be introduced into the surface. When the introduction of the surface polar group is insufficient, the adhesion between the polyolefin coating and the colored paint coating of various colors is reduced after the practical use test in the tidal zone, and blisters occur in the colored paint coating. Next, the paint used in the present invention will be described.
As the paint, from the viewpoint of weather resistance, commercially available acrylic-urethane-based paints such as NY Porin K of various colors manufactured by Shinto Paint Co., V top # 100 of various colors manufactured by Dainippon Paint Co., Ltd., Chinese paints General-purpose acrylic-silicone paints such as silica racks of various colors manufactured by Shinto Paint Co., Ltd., various colors of Ceraforte manufactured by Shinto Paint Co., Ltd., various colors of Duflon manufactured by Nippon Paint Co., Ltd., and V of various colors manufactured by Shinto Paint Co., Ltd. It is desirable to use a general commercially available fluorine-based paint such as CFC.

[0028]

The two-layer colored heavy anticorrosion coated steel sheet pile of the present invention comprises:
As shown in FIGS. 1 and 2, a specific hindered amine obtained by applying a chromate treatment 2 and a primer 3 to the surface of the crest or trough surface of a steel sheet pile 1 and subjecting it to a base treatment, and adhering it through a modified polyolefin adhesive layer 4. Containing four components of a UV-based stabilizer, a benzotriazole-based UV absorber, a phenolic antioxidant, and a coloring pigment as essential components, and a flame treatment or corona discharge treatment so that the surface has an oxygen concentration of 10% or more. And the like, on the surface of the electron beam cross-linking colored polyolefin layer 5 that has been treated by a surface modification method such as the above, a colored paint coating film 6 of various colors such as a fluorine-based paint, an acrylic-silicone-based paint, and an acrylic-urethane-based paint is sequentially laminated. It is characterized by having done.

The chromate treatment layer 2 and the epoxy primer layer 3 which are the base treatment maintain a sufficient adhesive force between the modified polyolefin layer adhesive layer 4 on the upper side and the steel material even in a long-term water contact environment, and the steel material. It is necessary to prevent the peeling of the coating. The chromate film 2 has a good adhesion amount of 50 to 1000 mg / m ^{2 in} terms of the total chromium adhesion amount, and the epoxy primer film 3 has a good film thickness of 10 to 150 μm. The electron beam crosslinked colored polyolefin layer 5 is
Since it has no adhesiveness, a modified polyolefin adhesive layer 4 is required which is obtained by modifying polyolefin to have adhesiveness. When the electron beam cross-linking colored polyolefin layer 5 contains four components of a specific hindered amine-based UV stabilizer, a benzotriazole-based UV absorber, a phenol-based antioxidant, and a coloring pigment as essential components, a coating material is applied on the surface. The film thickness of about 1 to 8 mm is suitable from the viewpoint of excellent color properties and the function of maintaining paint adhesion by preventing surface deterioration, and from anticorrosion performance and coating properties. The surface modification applied to the surface of the electron beam cross-linking colored polyolefin 5 is performed by treating with flame, corona or the like so that the oxygen concentration in the surface of several nm becomes 10% or more to improve the adhesiveness to the surface. Need to have. The colored paint coating film 6 is necessary for providing excellent color and long-term weather resistance to the outermost layer of the steel sheet pile, and is applied with a film thickness of 10 to 100 μm. When particularly excellent chromaticity is required, good chromaticity can be obtained by adjusting the pigment concentration in the paint so as to form a translucent film with the film thickness after coating.

[0030]

[Examples] FSP-III type, 5500 mm long steel sheet pile, while being transferred on a table roller, the valley portion was grid blasted to remove rust, and the chromate treatment agent had a total chromium deposition amount of 350 mg / m ² . Coating and baking so that the film thickness is 50 μm, and epoxy coating is applied by heating to 200 ° C. by high-frequency induction heating to cure, and then a maleic anhydride-modified polyethylene adhesive on the surface of 400- Electrostatic powder coating was performed so as to have a thickness of 600 μm. Then, an electron beam crosslinked colored polyolefin sheet containing 4 components of a hindered amine ultraviolet stabilizer, a benzotriazole ultraviolet absorber, a phenolic antioxidant, and a color pigment having a film thickness of 2 mm is attached and water-cooled, and a flame treatment is applied to the surface of the polyolefin. Alternatively, after performing a modification treatment using corona discharge treatment, the acrylic-urethane paint (Dainippon paint), acrylic-silicon paint (Shinto paint), or fluorine-based paint (Nippon paint) Of 30 μm was spray-coated to obtain two-layer colored heavy-corrosion protection steel sheet piles 1 to 24 according to the present invention. Electron beam cross-linking colored polyolefin coated surface after surface modification is made by Shimadzu's electron spectroscopy
Elemental analysis of the surface layer portion was performed using a for chemical analysis device, and it was confirmed that the oxygen concentration was 10% or more.

[0031]

[Comparative Examples 1 and 2] FSP-III type, 5500 mm long steel sheet pile, while being transferred on a table roller, the valleys were grid-blasted to remove rust and chromate treatment agent had a total chromium deposition amount of 350 mg / m 3. ² and then baked and spray-coated with an epoxy primer to a film thickness of 50 μm, heated to 200 ° C. by high frequency induction heating to cure, and then a maleic anhydride-modified polyethylene adhesive is applied to the surface. Electrostatic powder coating was performed so as to have a thickness of 400 to 600 μm. Next, the antioxidant 0.05-
An electron beam crosslinked colored low-density polyethylene sheet with a film thickness of 2 mm containing 5.0% is attached, water-cooled, and the surface of the polyethylene is modified by corona discharge treatment, and then a fluorine-based paint (Nippon Paint) is applied to the film thickness. Of 30 μm was spray-coated to obtain comparatively colored heavy corrosion-resistant steel sheet piles 1 and 2 corresponding to Japanese Patent Application No. 02-221715. Electron beam crosslinked black low density polyethylene coated surface after surface modification is JISK6768
"Wetting index (surface tension)" in the "wetting test method for polyethylene and polypropylene films" specified in
It was dyne / cm.

[0032]

[Comparative Examples 3 to 18] FSP-III type, length 5500 mm
While moving on the table roller of the steel sheet pile, the valley portion is grid-blasted to remove rust, the chromate treatment agent is applied and baked so that the total chromium adhesion amount becomes 350 mg / m ² , and the epoxy primer is applied to a film thickness. It was spray-coated so as to have a thickness of 50 μm, and heated at 200 ° C. by high-frequency induction heating to be cured. Next, a maleic anhydride-modified polyethylene adhesive was electrostatically powder coated on the surface so that the thickness was 400 to 600 μm. Then, an electron beam cross-linked colored polyethylene sheet having a film thickness of 2 mm and prepared by adjusting a hindered amine-based UV stabilizer, a benzotriazole-based UV absorber, a phenol-based antioxidant and a color pigment is pasted and cooled with water,
After modifying the surface of polyethylene with flame treatment or corona discharge treatment, acrylic-urethane paint (Dainippon paint), acrylic-silicon paint (Shinto paint), fluorine paint (Nippon paint) 2) was spray-coated to a film thickness of 30 μm to obtain comparatively colored heavy corrosion resistant steel sheet piles 3 to 18.

Abbreviations of hindered amine ultraviolet stabilizers, benzotriazole ultraviolet absorbers, and phenolic antioxidants added to electron beam crosslinked colored polyolefins in Examples and Comparative Examples are shown in Tables 1 to 3.

[0034]

[Table 1]

[0035]

[Table 2]

[0036]

[Table 3]

Four components of a hindered amine UV stabilizer, a benzotriazole UV absorber, a phenolic antioxidant and a color pigment added to the electron beam cross-linking colored polyolefin in Examples and Comparative Examples, and a surface modification method, a color paint. Are shown in Tables 4 to 8.

Two-layer colored heavy anticorrosion coated steel sheet piles 1 to 24 according to the present invention obtained in the above manner and comparative heavy anticorrosion coated steel sheet pile 1
After production of ~ 18, by visual inspection of 50 subjects, 10 points were shown in which the paint of the same color (blue) was applied on the colored polyolefin (blue), and the state was in a very excellent color. Relative evaluation of chromaticity was performed by setting 0 as a state having almost no sexuality. In addition, as a practical use test of the tidal belt, the manufactured coated steel sheet pile was cut and processed, and 70 mm width x 1
50 mm long x 3.2 mm thick cut plate, and a carbon arc lamp type sunshine weatherometer [black panel temperature: 63 ° C, relative humidity: 50%] was used to irradiate these cut plates with ultraviolet rays for 1000 hours and 60 Six cycles of tests were carried out by combining immersion in warm water of ℃ for 1000 hours, and after the test, the occurrence of blisters in the colored paint coating film was observed, and the adhesion test between the colored paint coating film and the electron beam crosslinked colored polyolefin coating was conducted. "Cross-cut test: JIS K5
According to No. 400, the adhesive strength was evaluated on a scale of 0 to 10 (maximum 10 points). The results are shown in Tables 4-8. As is clear from the results in the table, the two-layer colored heavy anticorrosion coated steel sheet pile according to the present invention is compared with the conventional heavy anticorrosion coated steel sheet pile,
The color of the paint is good and the color is excellent, and even after the actual use test in the tidal range, the blister of the colored paint coating does not occur, and the adhesion between the colored paint coating and the electron beam crosslinked colored polyolefin coating is sufficiently high. On the other hand, when the black polyolefin coatings of Comparative Examples 1 and 2 were used, the color of the paint was poor, and the paint adhesion after the actual use test in the tidal range was also reduced in the state where only the additive was added as the antioxidant. In addition, when even one of the four components added to the electron beam cross-linked colored polyolefins of Comparative Examples 3 to 6 was missing, when the surface modification of Comparative Example 7 was not performed, the addition component range of Comparative Examples 8 to 16 was used. If the surface modification treatment range is exceeded, or if the other additives of Comparative Examples 17 to 18 are used, the adhesion strength after the tidal zone practical test decreases.

[0039]

[Table 4]

[0040]

[Table 5]

[0041]

[Table 6]

[0042]

[Table 7]

[0043]

[Table 8]

[0044]

As is apparent from the above examples, a specific hindered amine-based ultraviolet stabilizer, benzo, which is adhered to the crests or troughs of a steel sheet pile subjected to a surface treatment through a modified polyolefin adhesive layer, The surface of a colored polyolefin layer containing four components of a triazole-based ultraviolet absorber, a phenol-based antioxidant, and a coloring pigment, and the surface of which is subjected to flame treatment or corona discharge treatment so that the oxygen concentration is 10% or more. , Coated steel sheet pile with electron beam cross-linking colored polyolefin in which colored coating films such as fluorine-based paints of various colors, acrylic-silicone paints, acrylic-urethane-based paints, etc. are sequentially laminated are compared to conventional heavy-corrosion-coated steel sheet piles. Since it has excellent color properties and there is little deterioration of the surface modification site, it is possible to use various colors of fluorine paint, acrylic-silicone paint, acrylic Water-resistant adhesion between the colored paint and the electron beam crosslinking the colored polyolefin coating such as Tan-based paint is excellent.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional view of a two-layer colored heavy anticorrosion coated steel sheet pile in which the mountain portion of the steel sheet pile is coated with the present invention.

FIG. 2 is a partial cross-sectional view of a heavy anticorrosion coated steel sheet pile in which the valley of the steel sheet pile is coated with the present invention.

FIG. 3 is a partial cross-sectional view of a conventional heavy anticorrosion coated steel material.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Steel sheet pile 2 ... Chromate treating agent coating layer 3 ... Epoxy primer layer 4 ... Modified polyolefin adhesive layer 5 ... Specific hindered amine ultraviolet stabilizer, benzotriazole ultraviolet absorber, phenolic antioxidant,
It contains four components of a coloring pigment, and the surface has an oxygen concentration of 10
% Electron-beam cross-linked colored polyolefin that has been surface-modified by flame treatment or the like so that the content is more than 6% .... Various paints such as fluorine-based paints, acrylic-silicone paints, acrylic-urethane-based paints, etc. 8 ... Chromate treatment agent coating layer 9 ... Epoxy primer layer 10 ... Modified polyolefin adhesive layer 11 ... Includes 0.05 to 5.0% antioxidant, and the surface is 36 dyne / by "wetting index (surface tension)". Electron-beam cross-linked colored polyolefin 12 ... Urethane primer layer 13 ...

Claims (3)

[Claims] 1. An electron beam cross-linking colored polyolefin layer containing the following components (1) to (4) as essential components as a corrosion-preventing layer is laminated on the ridges or valleys of a steel sheet pile subjected to a base treatment via a modified polyolefin adhesive. And a heavy-corrosion-proof coated steel, characterized in that the outer surface is modified, and a coloring paint coating film of any one of various colors of fluorine-based paint, acrylic-silicon-based paint, and acrylic-urethane-based paint is sequentially laminated. Yaita Hindered amine UV stabilizer Benzotriazole UV absorber Phenolic antioxidant Colored pigment 2. A hindered amine antioxidant is 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-pipedyl) imino}] or N, N'-bis (3-aminopropyl) ethylenediamine-2,4-bis [N-butyl-] N- (1,2,2,6,6-pentamethyl-4piperidyl) amino] -6-chloro-1,3
0.2-2.0 wt% of 5-triazine condensate, bis-
[2,2,6,6-Tetramethyl-4-piperidinyl]
It is a mixed addition of sebacate of 0.1 to 0.6 wt%, and the benzotriazole-based ultraviolet absorber is 2- (3
-T-butyl-5-methyl-2-hydroxyphenyl)
-5-chlorobenzotriazole, or (2- (3,5
-Di-t-butyl-2-hydroxyphenyl) -5-chlorobenzotriazole, or 2- (3,5-di-t-
Amyl-2-hydroxyphenyl) benzotriazole is 0.1 to 1.0 wt%, phenolic antioxidant is 0.01 to 1.0 wt%, and color pigment is 0.2 to 2
It is 0.0 wt%, The two-layer coloring heavy anticorrosion coating steel sheet pile of Claim 1 characterized by the above-mentioned. 3. As a method for modifying the surface of an electron beam crosslinked colored polyolefin, flame treatment or corona discharge treatment is performed so that the oxygen concentration on the outer surface is 10% or more, and a coating film of colored paint is sequentially laminated. The two-layer colored heavy anticorrosion coated steel sheet pile according to claim 1.