JPH0592513A - Steel sheet-pile coated with polyolefine having stripe pattern and production thereof - Google Patents

Abstract

PURPOSE:To obtain a steel sheet-pile coated with polyolefine which has a stripe pattern on the surface thereof and is excellent in beautiful appearance and a method for producing it. CONSTITUTION:In a conventional method for producing a steel sheet-pile coated with polyolefine wherein surface treatment has been performed and an polyolefine sheet is bonded on the surface thereof via a modified polyolefine adhesive layer, the surface of the steel sheet-pile is bonded and coated with the following two-layer sheet instead of the polyolefine sheet. This two-layer sheet is constituted by providing a polyolefine pattern layer 6 having a stripe pattern in various colors as a surface layer and laminating a polyolefine anticorrosive layer 5 as a lower layer.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polyolefin-coated steel sheet pile for use in steel structures used in rivers, harbors, etc. The present invention relates to a sheet pile and a manufacturing method thereof.

[0002]

2. Description of the Related Art For coating a conventional polyolefin-coated steel material, for example, a polyolefin-coated steel sheet pile, black polyethylene having excellent corrosion resistance and weather resistance is used. However, due to the recent increasing market needs for aesthetic landscapes of steel structures such as cityscapes and rivers and ports, it has been desired to develop polyolefin-coated steel sheet piles having various colors and being in harmony with the environment. To meet such needs, for example, as shown in FIG. 9, a urethane primer layer 31 is applied on the surface of a polyolefin coating 30 which has been subjected to flame treatment, and then a colored paint film 32 of various colors is applied. There is a coated steel sheet pile. In FIG. 9, 1 is a steel sheet pile, 2 is a chromate coating, 3 is an epoxy primer layer, and 4 is a modified polyolefin adhesive layer.

[0003]

However, in order to manufacture this conventional coated steel sheet pile, the steel sheet pile is once coated with polyolefin, the surface thereof is flame treated, and a urethane primer is coated, and then the surface thereof is further coated. It is necessary to apply colored paints of various colors, which makes the manufacturing process complicated. Furthermore, there is a limit to environmental harmony with a single color, and it is necessary to go through a more complicated painting process in order to impart various colored patterns that are easy to harmonize to the surface of the steel sheet pile. With the technology, it was difficult to give various color patterns that are easy to harmonize with the environment by a simple coating process, especially stripe patterns that are easy to harmonize with the waterside environment, on the surface of the polyolefin-coated steel sheet pile. ..

[0004]

Means for Solving the Problems As a result of intensive studies to solve the above-mentioned problems, the inventors of the present invention have adhesively coated a polyolefin sheet on the surface of a steel sheet pile subjected to a base treatment via a modified polyolefin adhesive layer. In the conventional method for manufacturing a polyolefin sheet-coated steel sheet pile, instead of a polyolefin sheet, a two-layer pattern T-die is used to combine a polyolefin pattern layer having a polyolefin anticorrosion layer in the entire width of the lower layer and a stripe pattern in the upper layer. The inventors have found that a polyolefin-coated steel sheet pile having stripe patterns of various colors can be easily obtained by adhesively coating a two-layer sheet obtained by extrusion-molding an integral sheet, and completed the present invention.

That is, according to the present invention, as shown in FIGS. 1 to 4, the chromate film 2 and the epoxy primer layer 3 are laminated on the peak surface or the trough surface of the blasted steel sheet pile and the base treatment is applied. , A polyolefin coated steel sheet pile in which a polyolefin anticorrosive layer 5 and a polyolefin pattern layer 6 having a stripe pattern are sequentially laminated through a modified polyolefin adhesive layer 4 on the surface thereof, and the surface of the steel sheet pile subjected to a base treatment is modified. After the polyolefin powder is electrostatically coated and heated and melted, a two-layer sheet 11 obtained by laminating a polyolefin anticorrosion layer and a polyolefin pattern layer having a stripe pattern in advance is pressed on the web portion as shown in FIG. Polyolefin-coated steel sheet pile that is sequentially bonded by roll 12, crimp roll 13 at web corner, and crimp rolls 14 and 15 at flange Manufacturing method, and after the powder of the modified polyolefin adhesive is electrostatically coated on the valley surface of the steel sheet pile subjected to the base treatment and heated and melted, as shown in FIG. 6, a polyolefin having a polyolefin anticorrosion layer and a stripe pattern in advance. Polyolefin coating in which the two-layer sheet 11 obtained by laminating the pattern layers is sequentially adhered by the pressure roll 16 for the web portion, the pressure roll 17 for the corners of the web portion, the pressure rolls 18 and 19 for the flange portions, and the pressure roll 20 for the nail portions. It is a manufacturing method of a steel sheet pile.

The present invention will be described in detail below. 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. Further, for the purpose of improving the corrosion resistance of the steel sheet pile, plating of zinc, aluminum, nickel, chromium or the like on the peak surface or the valley surface of the steel sheet pile, alloy plating of zinc-iron, zinc-nickel or the like, or plating or alloy plating It is also possible to use a material which has been subjected to dispersion plating in which inorganic fine particles such as silica and titanium oxide are dispersed.

As the surface treatment of the steel sheet pile, the peaks and valleys of the steel sheet pile are blasted by grit blasting, sand blasting or the like to remove rust, and then a chromate treatment agent is applied and baked, and then an epoxy primer is applied. It is carried out by curing, but other surface treatments such as chromate treatment, phosphate treatment, silane coupling treatment, epoxy primer treatment alone, or combination of chromate treatment and silane coupling treatment, phosphorus treatment It is also possible to use a base treatment in which acid salt treatment and silane coupling treatment or a phosphate treatment and epoxy primer treatment are combined, a base treatment in which silane coupling treatment and epoxy primer treatment are combined, and the like.

The chromate-treating agent used in the present invention is a commercially available silica-containing chromate-treating agent (for example, Cosmer # 100 manufactured by Kansai Paint Co., Ltd.), or a chromate-treating agent containing silica and phosphoric acid. A chromate treatment agent obtained by adding a silane coupling agent to a phosphoric acid-added chromate treatment agent is used. As the epoxy primer, the main component of bisphenol A diglycidyl ether, bisphenol AD diglycidyl ether or bisphenol F diglycidyl ether to which an inorganic pigment such as silica or titanium oxide is added, and an amine curing agent are mixed. A two-component mixed epoxy primer that is applied and cured by heating, or a diglycidyl ether of bisphenol A, a diglycidyl ether of bisphenol AD or a diglycidyl ether of bisphenol F, an inorganic pigment such as silica or titanium oxide, and a dicyandiamide-based curing agent. A one-pack type epoxy primer composed of a mixture of imidazole-based curing accelerators, which is applied with the mixture and cured by heating is used. In order to give a sufficient adhesive force between the steel sheet pile and the polyolefin coating, the thickness of the chromate coating is 250 to 10 in terms of the total chromium adhesion after baking.
The film thickness of the epoxy primer is set to 00 mg / m ² and the film thickness of the epoxy primer is set to 30 to 200 μm.

The modified polyolefin adhesive layer, the polyolefin anticorrosive layer and the polyolefin pattern layer having a stripe pattern, which cover the peaks or valleys of the steel sheet pile subjected to the base treatment, are polyethylene or 1-butene, 4-methyl-1- A modified product obtained by modifying a polyolefin of an α-olefin and ethylene copolymer such as pentene, 1-hexene, 1-octene and propylene with an acid anhydride such as maleic anhydride, the polyolefin, and a coloring pigment added to the polyolefin. Each of the colored polyolefins. As the polyolefin forming the polyolefin anticorrosion layer, those to which carbon black or a coloring pigment is added can be used. Furthermore, deterioration inhibitors such as ultraviolet stabilizers, ultraviolet absorbers, and antioxidants are added to these polyolefins as needed. In order to give a sufficient adhesive force between the steel sheet pile and the polyolefin coating, the thickness of the modified polyolefin adhesive layer is in the range of 50 to 900 μm. Also, in order to impart sufficient anticorrosion property to the coating, the lower limit of the film thickness of the polyolefin anticorrosion layer is set to 0.5 mm, and the upper limit of the film thickness is set so as not to impair the workability at the time of application with the pressure bonding roll. 8mm. In addition, the thickness of the polyolefin pattern layer is 0.2 mm as the lower limit to prevent the stripe pattern base from being seen through and to give a clear impression of the pattern. The upper limit of the film thickness is 8 mm so as not to impair the workability of.

Next, an example of a method for producing the polyolefin-coated steel sheet pile of the present invention will be described. Roll the steel sheet pile by blasting the crests or troughs with grit blast or sand blast to remove rust, and then deposit a chromate treatment agent on the surface so that the total amount of deposited chromium is in the range of 250 to 1000 mg / m ^2. Apply and bake. The baking temperature depends on the baking time in order to provide sufficient water resistant adhesion between the steel sheet pile and the polyolefin coating.
It is in the range of 0 to 250 ° C. For example, the temperature is 50 ° C. when the baking time is about 10 minutes, and the temperature is 250 ° C. when the baking time is about 1 minute. Next, a two-component mixed type epoxy primer or a one-component type epoxy primer is spray-coated on the surface of the chromate film so that the film thickness is in the range of 30 to 200 μm, and heated to cure. The heating temperature is 120 to 2 at the surface temperature of the steel sheet pile depending on the heating time.
Set the temperature within the range of 50 ° C. For example, the temperature is 120 ° C. when the heating time is about 3 minutes, and the temperature is 250 ° C. when the heating time is about 10 minutes. In this way, a steel sheet pile having a mountain surface or a valley surface subjected to a base treatment is obtained.

When the peaks or troughs of the steel sheet pile are coated with polyolefin, first, the powdered modified polyolefin adhesive is coated on the peaks or troughs of the steel sheet pile subjected to the base treatment in a thickness range of 50 to 900 μm. Electrostatically paint so that The heating temperature is in the range of 140 to 250 ° C. depending on the type of modified polyolefin adhesive. For example, with a maleic anhydride-modified polyethylene adhesive, 140 to 16
0 ° C., 160 to 190 ° C. for maleic anhydride-modified ethylene-1-butene copolymer, and 190 to 250 ° C. for maleic anhydride modified ethylene-propylene block copolymer. Next, as shown in FIG. 5, the polyolefin coating on the mountain surface of the steel sheet pile 1 transferred by the table roller 10 is performed by previously forming a polyolefin anticorrosion layer and a stripe pattern on the surface of the modified polyolefin adhesive layer in the molten state on the mountain surface. A two-layer sheet 11 obtained by laminating a polyolefin pattern layer having the above is used as a pressure roll 12 for a web portion, a pressure roll 13 for a corner of a web portion, and a pressure roll 1 for a flange portion.
Adhesion is performed in sequence with Nos. 4 and 15.

Further, as shown in FIG. 6, the polyolefin coating on the valley surface of the steel sheet pile is performed by forming a polyolefin anticorrosion layer and a stripe pattern in advance on the surface of the modified polyolefin adhesive layer in the molten state on the valley surface. The two-layer sheet 11 obtained by stacking the
6. Adhesion is performed in order by the pressure roll 17 at the corner of the web portion, the pressure rolls 18 and 19 at the flange portion, and the pressure roll 20 at the claw portion. In the case of the coating method as described above, the modified polyolefin adhesive layer is formed by electrostatic coating, but the modified polyolefin adhesive layer is preliminarily laminated on the back surface of the two-layer sheet, and the laminated sheet is heated. A method of adhering on the peak or valley epoxy primer layer can be used.

Further, as shown in FIGS. 7 and 8, the two-layer sheet 11 forms a polyolefin forming a polyolefin anticorrosion layer from the entire width of the lower layer of the two-layer pattern T die 24, and a stripe pattern from the upper layer. The colored polyolefins 7, 8 and 9 are then extruded and laminated in two layers at the position and width of the pattern to form a two-layer sheet. The width, position, number and color tone of the stripes in the upper layer of the two-layer sheet are changed depending on the size of the steel sheet pile and the design suitable for the landscape after driving. Further, when the sheet is deformed when the sheet is pressure-bonded and the pattern may be impaired, an electron beam may be irradiated from the surface of the sheet to crosslink the entire sheet.

[0014]

EXAMPLES The present invention will be described below based on examples. Example 1 “Cosmer # 100” manufactured by Kansai Paint Co., Ltd., which is a silica-added chromate treatment agent on the surface of steel sheet piles (FSPIII type × 5500 mm) by grit blasting to remove rust.
Was coated with a roll so that the total amount of deposited chromium was 600 mg / m ² , and baked at 50 ° C. for 10 minutes. Then, on the surface thereof, a main component obtained by adding 3% by weight of silica to diglycidyl ether of bisphenol A and "B002W" manufactured by Yuka Shell Epoxy Co., which is an amine-based curing agent, were mixed at a weight ratio of 2: 1 to form a film thickness. Spray coating to 50μ, 2
The epoxy primer layer was formed by heating at 50 ° C. for 1 minute and curing. Then, a powder adhesive of a maleic anhydride-modified ethylene-1-butene copolymer, which is a modified polyolefin adhesive, was electrostatically coated on the surface so that the film thickness was 400 μm, and heated to 250 ° C. to melt. Then, by the means shown in FIG. 5, an electron beam crosslinked two-layer sheet 11 obtained by electron beam crosslinking the laminated sheet of the polyolefin anticorrosion layer of the present invention and the polyolefin pattern layer having a stripe pattern on the surface of the web portion Crimping roll 12, crimping roll 13 at the corner of the web, crimping rolls 14 and 1 at the flange
5 was sequentially adhered to obtain a polyolefin-coated steel sheet pile having a stripe pattern of the present invention. The electron beam cross-linked two-layer sheet 11 is a black low-density polyethylene 5 containing 2% by weight of carbon black forming a polyolefin anticorrosion layer from the entire width of the lower layer of the two-layer pattern T-die 24 shown in FIG.
Also, a blue (color Marcel value: 2.5 B6 / 3) low-density polyethylene 7 that forms a stripe pattern from the upper layer
So that it comes to both left and right flanges of the steel sheet pile, and light blue (color Marcel value: 10 BG8 / 2) low-density polyethylene 8 comes to the corners of both flanges, and light gray green (color Marcel value of: 7.5 G8 /
Each of the low density polyethylene 9 of 1.5) is formed into a stripe so that the web part is present, and a laminated sheet in which upper and lower layers are integrated into two layers is extruded, and the laminated sheet is irradiated with an electron beam to crosslink the entire sheet. Manufactured. The covering width of low-density polyethylene 8 is 50 from the corner of the flange corner to the flange.
mm, and the web portion has a range of up to 50 mm. Also,
The thickness of the anticorrosion layer of the electron beam crosslinked two-layer sheet was 1.6 mm, and the thickness of the striped pattern layer was 1 mm. In FIG. 7, 21 is an extruder for supplying the black low-density polyethylene 5 to the two-layer pattern T die 24, and 22 is the two-layer pattern T-die 24 for the blue low-density polyethylene 7 forming a stripe pattern.
To the two-layer pattern T-die 24 is a light gray green low density polyethylene 9 forming a stripe pattern, and 29 is a light blue low density polyethylene 8 forming a stripe pattern. An extruder for supplying the layer pattern T die 24, 25, 26 and 27 forming rollers of a sheet forming apparatus, and 6 a pattern layer having a stripe pattern. A partial plan view and a sectional view of the polyolefin-coated steel sheet pile having a stripe pattern of the present invention thus obtained are
This is as shown in FIGS. 1 and 2.

Example 2 A valley surface of a steel sheet pile (FSPIII type × 5500 mm) was sandblasted to remove rust, and "Cosmer # 100" manufactured by Kansai Paint Co., which is a silica-added chromate treatment agent, was applied to the surface of the total chromium content. Of 500 mg / m ² was applied by a roll and baked at 250 ° C. for 1 minute. Next, on its surface, 100 parts by weight of diglycidyl ether of bisphenol A, 20 parts by weight of titanium oxide, and powder of dicyandiamide 7
A one-pack type epoxy primer prepared by mixing 3 parts by weight of imidazole curing accelerator with 1 part by weight was applied by ironing so as to have a film thickness of 50 μm and heated at 250 ° C. for 1 minute to be cured to form an epoxy primer layer. Then, a powder adhesive of a maleic anhydride-modified ethylene-1-butene copolymer, which is a modified polyolefin adhesive, is applied to the surface of the film to a thickness of 400 μm.
Was electrostatically coated so as to become, and heated to 180 ° C. to melt. Then, by the means shown in FIG. 6, an electron beam cross-linked two-layer sheet 11 obtained by electron beam cross-linking the laminated sheet of the polyolefin anticorrosion layer of the present invention and the polyolefin pattern layer having a stripe pattern on the surface thereof is pressure bonded to the web portion. Roll 1
6, the web portion corner pressure bonding roll 17 and the flange portion pressure bonding rolls 18 and 19 were sequentially adhered to obtain a striped patterned polyolefin sheet steel sheet pile of the present invention. The electron beam crosslinked two-layer sheet 11 has a two-layer pattern T shown in FIG.
Black low-density polyethylene 5 containing 2% by weight of carbon black for forming a polyolefin anticorrosion layer from the entire width of the lower layer of the die 24, and blue for forming a stripe pattern from the upper layer (Marcel value of color tone: 2.5 B6 / Low density polyethylene 7 of 3) is placed on both left and right flanges and claws of the steel sheet pile, and is light gray green (Marcel value of color tone:
7.5G8 / 1.5) low density polyethylene 9 is formed into a stripe shape so that the web portion is located, and an upper layer and a lower layer are extruded to form a laminated sheet, and the laminated sheet is irradiated with an electron beam to irradiate the entire sheet. Was crosslinked to produce. The thickness of the anticorrosion layer of the electron beam crosslinked two-layer sheet was 2.0 mm and the thickness of the striped pattern layer was 0.2 mm. In FIG. 8, 2
1 is an extruder that supplies black low-density polyethylene 5 to a two-layer pattern T die, 22 is an extruder that supplies blue low-density polyethylene 7 that forms a stripe pattern to a two-layer pattern T die, and 23 is a stripe pattern An extruder for supplying the light gray green low-density polyethylene 9 to be formed to a two-layer pattern T-die, 2.
5, 26 and 27 are forming rolls of the sheet forming apparatus, and 6 is a pattern layer having a stripe pattern. The partial plan view and cross-sectional view of the striped polyolefin-coated steel sheet pile of the present invention thus obtained are as shown in FIGS. 3 and 4.

[0016]

According to the present invention, as is apparent from the above examples, the two-layer pattern T-die 2 is formed on the surface of the steel sheet pile 1 which has been subjected to the base treatment, through the modified polyolefin adhesive layer 4.
4 is obtained by extruding a two-layer integrated sheet by combining a polyolefin anticorrosion layer 5 on the entire width of the lower layer and a polyolefin pattern layer 6 having a stripe pattern on the upper layer, and coating the two-layer sheet 11 by adhesive coating. Thus, a polyolefin-coated steel sheet pile having a striped pattern of various colors and having an excellent appearance and being easy to harmonize with the environment can be easily obtained.

[Brief description of drawings]

FIG. 1 is a plan view showing a part of a polyolefin-coated steel sheet pile having a stripe pattern on a mountain portion of the present invention.

FIG. 2 is a sectional view taken along the line AA of FIG.

FIG. 3 is a plan view showing a part of a polyolefin-coated steel sheet pile having a stripe pattern in the valley portion of the present invention.

FIG. 4 is a sectional view taken along line BB of FIG.

FIG. 5 is a perspective view showing an example of a coating method of a polyolefin-coated steel sheet pile having a stripe pattern on the mountain portion of the present invention.

FIG. 6 is a perspective view showing an example of a method for coating a polyolefin-coated steel sheet pile having a stripe pattern in the valley portion of the present invention.

FIG. 7 is a perspective view showing an example of a method for producing a laminated sheet of a polyolefin anticorrosive layer used for coating a mountain portion of the present invention and a polyolefin pattern layer having a stripe pattern.

FIG. 8 is a perspective view showing an example of a method for producing a laminated sheet of a polyolefin anticorrosion layer used for coating a valley portion of the present invention and a polyolefin pattern layer having a stripe pattern.

FIG. 9 is a cross-sectional view showing a part of a steel sheet pile coated with a colored coating material by a conventional coating method.

[Explanation of symbols]

1 Steel sheet pile removed by blast treatment 2 Chromate coating 3 Epoxy primer layer 4 Modified polyolefin adhesive layer 5 Polyolefin anticorrosion layer 6 Polyolefin pattern layer having stripe pattern 7 Colored polyolefin forming stripe pattern 8 Coloring forming stripe pattern Polyolefin 9 Colored polyolefin that forms a striped pattern 10 Table roller that transports and conveys steel sheet pile 11 Electron beam cross-linking two-layer sheet 12 Crimping roll for web portion of mountain portion 13 Crimping roll for web portion of mountain portion 14 Flange portion of mountain portion Crimping roll 15 Flange crimping roll 16 Valley web crimping roll 17 Valley web corner crimping roll 18 Valley flange crimping roll 19 Valley flange crimping roll 20 Claw part crimp 21 Extruder for supplying black low-density polyethylene to the two-layer pattern T-die 22 Extruder for supplying blue low-density polyethylene to the two-layer pattern T-die 23 Light gray green for forming the stripe pattern Extruder for supplying low-density polyethylene to a two-layer pattern T-die 24 Two-layer pattern T-die 25 Forming roll of sheet forming apparatus 26 Forming roll of sheet forming apparatus 27 Forming roll of sheet forming apparatus 28 Sheet feeding roll 29 Forming stripe pattern Extruder that supplies light blue low-density polyethylene to a two-layer pattern T-die 30 Flame-retarded polyethylene layer 31 Urethane primer layer 32 Colored paint coating of various colors

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hirotada Kato 1 Kimitsu, Kimitsu-shi, Chiba Nippon Steel Corporation Stock of Kimitsu Steel Co., Ltd.

Claims (6)

[Claims] 1. A striped pattern characterized in that a polyolefin anticorrosion layer and a polyolefin pattern layer having a striped pattern are sequentially laminated on a mountain or valley surface of a steel sheet pile subjected to a base treatment through a modified polyolefin adhesive layer. Polyolefin coated steel sheet pile having. 2. The modified polyolefin adhesive layer, the polyolefin anticorrosive layer and the striped polyolefin pattern layer are formed of polyethylene or α such as 1-butene, 4-methyl-1-pentene, 1-hexene, 1-octene and propylene. A olefin / ethylene copolymer polyolefin modified with an acid anhydride such as maleic anhydride; the polyolefin; and a colored polyolefin obtained by adding a coloring pigment to the polyolefin. Item 2. A polyolefin-coated steel sheet pile having a striped pattern according to item 1. 3. A polyolefin-coated steel sheet pile having a striped pattern according to claim 1, wherein a chromate coating and an epoxy primer layer are laminated on the peaks or troughs of a steel sheet pile that has been blasted as a base treatment for the steel sheet pile. 4. A modified polyolefin adhesive powder is electrostatically coated on the mountain surface of a steel sheet pile that has been subjected to a base treatment and heated and melted, and then a polyolefin anticorrosion layer and a polyolefin pattern layer having a stripe pattern are laminated in advance. Of the polyolefin sheet steel sheet pile having a striped pattern, characterized in that the laminate sheet 11 produced by the above is sequentially bonded by a pressure roll 12 for the web portion, a pressure roll 13 for the corners of the web portion, and pressure rolls 14, 15 for the flange portion. Manufacturing method. 5. A powder of a modified polyolefin adhesive is electrostatically coated on the valley surface of a steel sheet pile that has been subjected to a base treatment and heated and melted, and then a polyolefin anticorrosion layer and a polyolefin pattern layer having a stripe pattern are laminated in advance. The two-layer sheet 11 obtained by the above is applied to the pressure roll 16 for the web portion, the pressure roll 17 for the corner of the web portion, and the pressure rolls 18, 1 for the flange portion.
9. A method for producing a polyolefin-coated steel sheet pile having a striped pattern, which comprises sequentially adhering with a pressure-bonding roll 20 of a claw portion. 6. A colored polyolefin 7 and a colored polyolefin 8 which form a polyolefin anticorrosion layer from the lower layer of the two-layer pattern T-die 24 to the full width and form a stripe pattern from the upper layer of the two-layer pattern T-die 24. A polyolefin having a striped pattern according to claim 4 or 5, wherein a two-layer sheet 11 in which two layers of colored polyolefin 9 are extruded and laminated in a striped pattern at each position and width to form a pattern is used. Manufacturing method of coated steel sheet pile.