JPH0596682A - Polyolefin-covered steel sheet pile having raised pattern and production thereof - Google Patents

Abstract

PURPOSE:To provide a polyolefin-covered steel sheet pile with brick- or dot-like raised patterns on its surface to offer an excellent appearance, and production thereof. CONSTITUTION:A colored polyolefin layer 5 is formed on the surface of a steel sheet pile 1 which has been subjected to surface preparation via a modified polyolefin adhesive layer 4 and a colored polyolefin layer 6 is partially formed on the surface of the colored polyolefin layer 5 in a raised form.

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. More specifically, it is a brick-like or dot-like convex pattern on the surface of a colored polyolefin coating. The present invention relates to a polyolefin-coated steel sheet pile having excellent appearance and a manufacturing method thereof.

[0002]

2. Description of the Related Art For coating a conventional 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. 17, a urethane primer layer 25 is applied to the surface of the flame-treated electron beam cross-linked black polyethylene coating 24, and then a colored paint coating film 26 of various colors is applied. Coated steel sheet piles are known.
In FIG. 17, 1 is a steel sheet pile, 2 is a chromate film, 3 is an epoxy primer, and 4 is a modified polyolefin adhesive layer.

[0003]

However, in order to manufacture the above-mentioned conventional coated steel sheet pile, the steel sheet pile 1 is once coated with polyolefin, and the surface thereof is flame treated to be coated with a urethane primer, and the surface thereof is further coated. Since it is necessary to apply colored paints of various colors to the product, the manufacturing process is complicated. In addition, 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. As a result, on the surface of the polyolefin coated steel sheet pile, various color patterns that are easy to harmonize with the environment by a simple coating process,
In particular, it was difficult to add a brick pattern or a dot pattern that was in the image of soil, which is easy to harmonize with the environment of the waterfront.

[0004]

As a result of intensive studies to solve the above-mentioned problems, the inventors of the present invention have conducted electron beam cross-linking 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-coated steel sheet pile for adhering a polyolefin sheet, instead of the electron beam cross-linking polyolefin sheet, a colored polyolefin sheet having a partially convex colored polyolefin laminated on the surface is adhesively coated to form a convex pattern. It was found that a polyolefin-coated steel sheet pile having the above can be easily obtained, and the present invention has been completed.

That is, according to the present invention, as shown in FIGS. 1 to 8, the chromate film 2 and the epoxy primer layer 3 are sequentially laminated on the peak surface or the valley surface of the blasted steel sheet pile 1 to form a base. A colored polyolefin layer 5 which has been subjected to a treatment and has a surface through the modified polyolefin adhesive layer 4
Is laminated, and the colored polyolefin layer 6 is partially laminated on the surface of the colored polyolefin layer 5 to form a polyolefin-coated steel sheet pile having a convex pattern such as a brick pattern or a dot pattern on the surface. In addition, the present invention, after the powder of the modified polyolefin adhesive is electrostatically coated on the mountain surface of the steel sheet pile subjected to the base treatment and heated and melted, the colored polyolefin sheet is partially convex in advance on the surface of the colored polyolefin sheet. The convex polyolefin sheet 8 laminated on the
As shown in FIG. 1, the crimping roll 9 at the web portion, the crimping roll 10 at the corner of the web portion, the crimping roll 11 at the flange portion,
In the method for manufacturing a polyolefin-coated steel sheet pile having a convex pattern, which is characterized in that they are sequentially adhered to each other. Further, according to the present invention, a powder of a modified polyolefin adhesive is electrostatically coated on the valley surface of a steel sheet pile subjected to a base treatment and heated and melted, and then the colored polyolefin sheet is partially convexized in advance on the surface of the colored polyolefin sheet. As shown in FIGS. 11 and 12, the convex-shaped polyolefin sheet 8 laminated on the pressure-bonding roll 13 of the web part, the pressure-bonding roll 14 of the corner of the web part, the pressure-bonding rolls 15 and 16 of the flange part, and the pressure-bonding roll 17 of the claw part. A method for manufacturing a polyolefin-coated steel sheet pile having a convex pattern characterized by sequentially adhering by means of and.

When the convex polyolefin sheet 8 is manufactured, as shown in FIGS. 13 and 14, the colored polyolefin sheet 18 is heated by a heating device 19, and the surface of the colored polyolefin sheet 18 is partially set in advance. A colored polyolefin sheet 21 weighed using a nozzle 20 is placed at a position, and then pressed from a surface thereof with a die 22 having a large number of rectangular recesses 27 to form a convex polyolefin sheet 8 having a convex brick pattern. Can be manufactured. When manufacturing the convex polyolefin sheet 8, as shown in FIGS. 15 and 16, the colored polyolefin sheet 18 is placed on the heating device 1.
9 and the colored polyolefin sheet 21 is weighed using a nozzle 20 at a predetermined partial position on the surface of the colored polyolefin sheet 18, and then a mold having a large number of cylindrical recesses 28 from the surface thereof. By pressing with 23, the convex polyolefin sheet 8 having a large number of convex dot patterns can be manufactured.

Next, the present invention will be described in detail. The steel sheet pile 1 used in the present invention is a steel sheet pile manufactured from an alloy steel such as carbon steel or stainless steel. Further, in order to improve the corrosion resistance of the steel sheet pile, plating of zinc, aluminum, nickel, chromium or the like, alloy plating of zinc-iron, zinc-nickel or the like, or plating or alloy plating on the peak surface or the valley surface of the steel sheet pile is performed. 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 base 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 after 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 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 generally 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 treating agent obtained by adding a silane coupling agent to a phosphoric acid-added chromate treating agent can be 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 50 in terms of the total chromium adhesion after baking.
The film thickness of the epoxy primer is set to 1000 mg / m ² and the film thickness of the epoxy primer is set to 30 to 200 μm.

The modified polyolefin adhesive layer covering the peaks or troughs of the steel sheet pile subjected to the base treatment, the colored polyolefin layer and the partially colored convex polyolefin layer are polyethylene or 1-butene, A modified product obtained by modifying a polyolefin of a copolymer of α-olefin such as 4-methyl-1-pentene, 1-hexene, 1-octene and propylene and ethylene with an acid anhydride such as maleic anhydride, and a color pigment were added. Each of the polyolefins is formed. 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 film thickness of the modified polyolefin adhesive layer is in the range of 50 to 900 μm. Further, in order to impart sufficient anticorrosion property to the coating, the lower limit of the film thickness of the polyolefin layer is set to 0.5 mm so as not to impair the workability at the time of application with a pressure roll during coating,
The upper limit of the film thickness is 8 mm. Also, the thickness of the convex colored polyolefin layer partially laminated on the surface of the colored polyolefin layer is set to 0.5 mm as the lower limit of the thickness in order to give a convex appearance to the pattern, and it is attached by a pressure bonding roll at the time of coating. The upper limit of the film thickness is 8 mm so as not to impair the workability at the time.

Next, an example of the method for manufacturing the polyolefin-coated steel sheet pile of the present invention will be described. The ridges or valleys of steel sheet pile are blasted by grit blasting or sand blasting to remove rust, and a chromate treatment agent is applied to the surface and the total chromium adhesion amount after baking is 250 to 1000 mg / m ²
Apply with a roll so that it is within the range, 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 1 minute. In this way, a steel sheet pile having a mountain surface or a valley surface subjected to a base treatment is obtained.

Next, in the case of coating the peaks or troughs of the steel sheet pile with polyolefin, first, the modified polyolefin adhesive powder having a film thickness of 10 μm Electrostatic coating is performed so as to be in the range of 50 to 900 μm, and heating and melting are performed. The heating temperature is in the range of 160 to 250 ° C. depending on the type of modified polyolefin adhesive. For example, with a maleic anhydride-modified polyethylene adhesive, 160 to 200 ° C., maleic anhydride-modified ethylene-1
-In the butene copolymer, the range is 180 to 250 ° C.

Then, the coating of the pile surface of the steel sheet pile with the polyolefin is carried out by transporting the steel sheet pile on the table roller, and as shown in FIGS. 9 and 10, the modified polyolefin adhesive layer in the molten state of the pile surface. On the surface of the convex polyolefin sheet 8 in which the colored polyolefin sheet is partially laminated in a convex shape on the surface of the colored polyolefin sheet in advance,
The pressure bonding roll 9 at the web portion, the pressure bonding roll 10 at the corner of the web portion, and the pressure bonding rolls 11 and 12 at the flange portion are sequentially pressed and bonded.

Further, the polyolefin coating on the valley surface of the steel sheet pile is carried out while the steel sheet pile is transferred and conveyed on the table roller.
As shown in FIGS. 11 and 12, on the surface of the modified polyolefin adhesive layer in the molten state of the valley surface, a convex polyolefin sheet 8 in which colored polyolefin sheets are partially laminated in a convex shape in advance on the surface of the colored polyolefin sheet is formed. The pressure bonding roll 13 at the web portion, the pressure bonding roll 14 at the corner of the web portion, the pressure bonding rolls 15 and 16 at the flange portion, and the pressure bonding roll 17 at the claw portion are sequentially pressed and bonded.

A silicon rubber or urethane rubber roll is used as the pressure roll for the web, the pressure roll for the corner of the web, the pressure roll for the flange, and the pressure roll for the claw used to bond the convex polyolefin sheet 8. And the load when crimping the crimp roll is 0.1-8 kg
It is set in the range of / cm ² . The load is 0.1 kg / cm ²
If it is less than the above range, the adhesion becomes non-uniform and a portion where the adhesive force is lowered is generated, and if the load exceeds 8 kg / cm ² , the pattern of the convex colored polyolefin portion is deformed and the appearance is deteriorated. Therefore, it is necessary to set the load within the above range. As a method of applying the crimping load, a means of pressing with an air cylinder or a hydraulic cylinder can be adopted,
A means other than this, for example, a means for pressing down with a weight or the like may be adopted.

Next, a method for producing the convex polyolefin sheet 8 used in the present invention will be described by taking a brick convex pattern and a dot convex pattern as an example. First, the convex polyolefin sheet 8 having a brick-like convex pattern on the surface is
As shown in FIGS. 13 and 14, a colored polyolefin sheet 18 formed into a sheet by a T-die extrusion molding method or the like.
Is conveyed by a roller onto the heating device 19 and heated.
The heating temperature is in the range of 60 to 140 ° C. and varies depending on the type of polyolefin. For example, for colored polyethylene, the heating temperature is 60 to 80 ° C, and for colored ethylene-1-butene copolymer, the heating temperature is 80 to 100 ° C.
The heating temperature of the propylene block copolymer is 120 to 1
Set in the range of 40 ° C. If the heating temperature is lower than the lower limit temperature, the adhesion with the colored polyolefin 21 partially laminated on the surface of the colored polyolefin sheet 18 in the next step becomes insufficient, and if the heating temperature exceeds the upper limit temperature, the colored polyolefin sheet 18 is reached. Will be deformed or melted and the appearance will deteriorate. Next, the heated colored polyolefin sheet 18 is transferred to the lower side of the nozzle 20 by a roller, and the melt of the colored polyolefin 21 is placed at a predetermined position on the surface of the colored polyolefin sheet 18 at the center of the brick-shaped convex portion.
Extrude from 0 and place. The molten material of the colored polyolefin 21 is supplied to the nozzle 20 from an injection molding machine through a measuring cylinder. The extrusion amount of the melt of the colored polyolefin 21 is an amount corresponding to the volume of the corresponding rectangular recess 27 of the die 22 of the press in the next step. Colored polyolefin 2
The melting temperature of the melt of No. 1 is in the range of 160 to 260 ° C.,
It depends on the type of polyolefin. For example, the melting temperature is 160 to 230 ° C. for colored polyethylene, 180 to 240 ° C. for colored ethylene-1-butene copolymer, and 200 to 260 ° C. for colored ethylene-block copolymer. If the melting temperature is lower than the lower limit temperature, the fluidity of the melt is too bad, and the melt is pressed by the mold 2 in the next step.
It takes a long time to fully fill the rectangular concave portion 27 of No. 2 and if the melting temperature exceeds the upper limit temperature, the melt will stick out from the contact surface between the colored polyolefin sheet 18 and the mold 22 during pressing, and the appearance will deteriorate. To do.

The colored polyolefin sheet 18 on which the molten material of the colored polyolefin 21 is placed is attached to the mold 22 of the press machine.
Of the mold, press-mold it with the mold 22,
A colored polyolefin sheet 8 having a brick-like convex pattern on the surface is obtained. The die 22 to be used has a brick-shaped rectangular recess 27 on the pressing surface, and the size and depth of the rectangular recess 27 and the interval between the rectangular recesses are determined by a pattern design. The mold 22 is heated before pressing and then pressed. The heating temperature is in the range of 60 to 140 ° C. and varies depending on the type of polyolefin. For example, the heating temperature is set to 60 to 80 ° C. for colored polyethylene, 80 to 100 ° C. for colored ethylene-1-butene copolymer, and 120 to 140 ° C. for colored ethylene-propylene block copolymer. When the heating temperature is lower than the lower limit temperature, it takes a long time to smooth the surface after pressing, and when the heating temperature exceeds the upper limit temperature, the mold 22 after pressing and the colored polyolefin 21 are separated from each other. The pattern becomes worse. The load during pressing is set in the range of 1 to 50 kg / cm ² . The load is 1 kg /
When it is less than cm ² , it becomes difficult to smooth the surface of the colored polyolefin 21 after pressing, and the load is 50%.
If it exceeds kg / cm ² , the colored polyolefin sheet 18 is deformed and the appearance is deteriorated.

When the colored polyolefin sheet having a brick-like convex pattern on the surface obtained as described above is pressure-bonded to the surface of a steel sheet pile with a pressure roll, the convex portion of the sheet is deformed to form a pattern. If there is a possibility of damage, the entire surface of the sheet may be irradiated with an electron beam to crosslink the entire sheet.

According to the method described above, the convex polyolefin sheet 8 having a brick-like pattern on its surface is manufactured.
The color tone of the flat colored polyolefin sheet 18 of the base, the color tone of the colored polyolefin 21 forming the convex portion of the brick portion, and a combination of both the color tones, and one kind of color tone is used for the colored polyolefin portion of the convex portion of the brick portion Whether to use the color tone of is decided by the design of the brick pattern.

When manufacturing the convex polyolefin sheet 8 having a dot-shaped convex pattern on the surface thereof, FIG. 15 and FIG.
As shown in FIG. 6, the colored polyolefin sheet 18 formed into a sheet by the T-die extrusion molding method or the like is conveyed by rollers onto the heating device 19 and heated. The heating temperature is 60 ~
The temperature is set to 140 ° C, and the heating temperature is changed depending on the type of polyolefin. For example, the heating temperature for colored polyethylene is 60 to 80 ° C, the heating temperature for colored ethylene-1-butene copolymer is 80 to 100 ° C, and the heating temperature for colored ethylene-propylene block copolymer is 120 to 140 ° C.
Set to the range of. When the heating temperature is lower than the lower limit temperature,
In the next step, when the adhesion with the colored polyolefin 21 partially laminated on the surface of the colored polyolefin sheet 18 becomes insufficient and the heating temperature exceeds the upper limit temperature, the colored polyolefin sheet 18 is deformed or melted to give an appearance. become worse. The heated colored polyolefin sheet 18 is transferred by a roller below the nozzle 20, and the colored polyolefin 2
1 of the melted product of a predetermined colored polyolefin sheet
Nozzle 20 extrudes and mounts it at the central position of the dot-shaped convex portion on the surface of No. 8. The melt of the colored polyolefin 21 is supplied to the nozzle 20 from an injection molding machine through a measuring cylinder. The extrusion amount of the melt of the colored polyolefin 21 is an amount corresponding to the volume of the corresponding cylindrical recess 28 of the die 23 of the press in the next step. The melting temperature of the melt of the colored polyolefin 21 is in the range of 160 to 260 ° C. and varies depending on the type of polyolefin. For example, the melting temperature of the colored polyethylene is 160 to 230 ° C., the melting temperature of the colored ethylene-1-butene copolymer is 180 to 240 ° C., and the melting temperature of the colored ethylene-propylene block copolymer is 200 to 260 ° C. If the melting temperature is less than the lower limit temperature, the flowability of the molten material is too poor, and it takes a long time for the molten material to sufficiently fill the cylindrical recessed portion 28 of the die 23 in the pressing in the next step, and the melting temperature is the upper limit. If the temperature is exceeded, the melt will protrude from the contact surface between the colored polyolefin sheet 18 and the mold 22 during pressing, and the appearance will deteriorate.

The colored polyolefin sheet 18 on which the molten material of the colored polyolefin 21 is placed is attached to the mold 23 of the press machine.
Of the polyolefin sheet 8 having a dot-shaped convex pattern on the surface thereof. The die 23 has a large number of dot-shaped cylindrical recesses 28 on the pressing surface, and the diameter, depth and spacing of the cylindrical recesses 28 are determined by a pattern design. The die 23 is heated and pressed before pressing. The heating temperature of the mold 23 is 60 to 140.
Set in the range of ° C and change depending on the type of polyolefin. For example, with colored polyethylene, the heating temperature of the mold 23 is 60
~ 80 ° C, 80 for colored ethylene-1-butene copolymer
To 100 ° C, and in the case of a colored ethylene-propylene block copolymer, the temperature range is 120 to 140 ° C. If the heating temperature of the mold is less than the lower limit temperature, it takes a long time to smooth the surface after pressing, and if the heating temperature of the mold exceeds the upper limit temperature, the mold 23 after pressing and the colored polyolefin 21 are pressed. The releasability between the two becomes poor. The load during pressing is 1 to 50 kg / cm
Set to a range of ² . When the load is less than 1 kg / cm ² , it is difficult to smooth the surface of the colored polyolefin 21 after pressing, and when the load exceeds 50 kg / cm ² , the colored polyolefin sheet 18 is deformed and the appearance deteriorates. ..

When the colored polyolefin sheet having a dot-like convex pattern on the surface obtained as described above is pressure-bonded to the surface of the steel sheet pile with a pressure roll, the convex portion of the sheet is deformed to form a pattern. If there is a possibility of damage, the entire surface of the sheet may be irradiated with an electron beam to crosslink the entire sheet.

The convex polyolefin sheet 8 having a dot pattern on the surface is manufactured by the above-mentioned method. The color tone of the flat colored polyolefin sheet 18 of the base and the color tone of the colored polyolefin portion constituting the dot-shaped convex portion are Whether a combination of both color tones and one color tone or a plurality of color tones are used for the colored polyolefin portion of the dot-shaped convex portion is determined by the dot pattern design.

[0024]

EXAMPLES Next, examples of the present invention will be described. Example 1 The mountain surface of a steel sheet pile (FSPIII type × 5500 mm length) was subjected to grit blast treatment to remove rust, and "Cosmer # 100" manufactured by Kansai Paint Co., which is a silica-added chromate treatment agent, was entirely attached to the surface. It was coated with a roll so that the amount of deposited chromium was 600 mg / m ² , and baked at 50 ° C. for 10 minutes. Then, on the surface thereof, "B00ZW" manufactured by Yuka Shell Epoxy Co., Ltd. which is an amine-based curing agent and a main agent obtained by adding 3% by weight of silica fine powder to diglycidyl ether of bisphenol A.
Was mixed at a weight ratio of 2: 1 and spray-coated to a film thickness of 200 μm, and heated at 250 ° C. for 1 minute to be cured to form an epoxy primer layer. Next, a maleic anhydride-modified low-density polyethylene powder adhesive was electrostatically coated on the surface so that the film thickness was 900 μm, and heated to 180 ° C. to melt. Then, by the method shown in FIG. 9, a convex polyolefin sheet 8 made of an electron beam cross-linking convex low density polyethylene sheet having a brick convex pattern on the surface.
To the steel sheet pile 1 by a pressure bonding roll 9 at the web portion, a pressure bonding roll 10 at the corner of the web portion, and pressure bonding rolls 11 and 12 at the flange portion in order, and as shown in FIG. 1 and FIG. A polyolefin-coated steel sheet pile having a brick-shaped convex pattern was obtained. An electron beam cross-linking convex low-density polyethylene sheet having a brick-shaped convex pattern on the surface was manufactured by the following method. First, as shown in FIGS. 13 and 14, a colored polyolefin sheet 18 made of a black (Marcel value of color tone: N2.0) low-density polyethylene sheet
Was transferred onto the heating device (electrical heater plate) 19 by a roller and heated to 70 ° C., and then transferred below the nozzle 20 by a roller. Then brown (Marcel value of color: 10R
4/7) colored polyolefin 21 made of low density polyethylene is melted to 200 ° C. by an injection molding machine, and measured by a measuring cylinder and extruded from a nozzle 20 onto a black low density polyethylene sheet heated to 70 ° C. It was then placed under the press and then transferred by rollers to the bottom of the press. next,
The surface was press-molded with a mold 22 having a brick-shaped rectangular recess (depth: 3 mm) on the press surface to form a brick-shaped convex pattern. An electron beam was irradiated from the surface of the black low-density polyethylene sheet having a brown brick-shaped convex pattern formed on the surface to crosslink the entire sheet to produce an electron-beam crosslinked convex low-density polyethylene sheet.

Example 2 The mountain surface of a steel sheet pile (FSPIII type × 5500 mm length) was sandblasted to remove rust, and a phosphoric acid / silica added chromate treatment agent had a total chromium deposition amount of 250 mg /
It was coated with a roll so as to have a size of m ² and baked at 250 ° C. for 1 minute. Then, "B0" manufactured by Yuka Shell Epoxy Co., Ltd., which is an amine-based curing agent, is prepared by adding 3% by weight of silica fine powder to diglycidyl ether of bisphenol A on the surface of the resin.
[0ZW] was mixed in a weight ratio of 2: 1 and spray-coated so that the film thickness was 30 μm, and heated and cured at 120 ° C. for 3 minutes to form an epoxy primer layer. Subsequently, a maleic anhydride-modified ethylene-1-butene copolymer powder adhesive was electrostatically coated on the surface so that the film thickness was 50 μm, and heated to 220 ° C. to melt. Next, according to the method shown in FIG. 10, a convex polyolefin sheet 8 made of an electron beam cross-linking convex ethylene-1-butene copolymer sheet having a dot-shaped convex pattern on the surface was applied to the steel sheet pile 1 in the web portion. A polyolefin-coated steel having pressure-bonded rolls 9 and pressure-bonded rolls 10 at the corners of the web and pressure-bonded rolls 11 and 12 at the flanges, which are sequentially pressure-bonded to each other, as shown in FIGS. I got a sheet pile. An electron beam cross-linking convex ethylene-1-butene copolymer sheet having a dot-like convex pattern on the surface was produced by the following method. First, FIG.
And as shown in FIG. 16, a colored polyolefin sheet 18 made of a light brown (Marcel value of color tone: 10YR7 / 4) ethylene-1-butene copolymer sheet is placed on a heating device (electric heater plate) 19 with a roller. Transfer 9
After heating to 0 ° C., it was transferred under the nozzle 20 by a roller. Next, brown (Marcel value of color tone: 2.5YR5
/6.5), the colored polyolefin 21 composed of the ethylene-1-butene copolymer is melted to 220 ° C. by an injection molding machine, and measured with a measuring cylinder to measure 90 from the nozzle 20.
The mixture was extruded and placed on a light brown ethylene-1-butene copolymer sheet heated to 0 ° C., and then transferred by a roller under a press. Next, the surface is covered with a dot-shaped cylindrical recess 28.
(Depth: 2 mm) was press-molded with a mold 23 having a pressing surface to form a dot-shaped convex pattern. The entire sheet is cross-linked by irradiating an electron beam from the surface of the light brown ethylene-1-butene copolymer sheet having a brown dot-like convex pattern formed on the surface,
An electron beam cross-linked convex pattern ethylene-1-butene copolymer sheet was produced.

Example 3 A valley surface of a steel sheet pile (SGPIII type × 5500 mm length) was grid-blasted to remove rust, and a silica-added chromate treatment agent (“Cosmer # 1” manufactured by Kansai Paint Co., Ltd. was formed on the surface.
00 ") was applied by a roll so that the total amount of deposited chromium was 1000 mg / m ² , and baked at 250 ° C for 1 minute. Then, on the surface thereof, a main agent obtained by adding 3% by weight of silica fine powder to diglycidyl ether of bisphenol A and an amine-based curing agent (“Gascamin G328” manufactured by Mitsubishi Gas Chemical Co., Inc.) were mixed at a weight ratio of 100: 24. A liquid-mixing type epoxy primer was spray-coated so that the film thickness was 200 μm, and heated at 250 ° C. for 1 minute to be cured to form an epoxy primer layer. Next, 50 μm of a powder adhesive of maleic anhydride-modified low-density polyethylene was applied to the surface.
Was electrostatically coated so as to become, and heated to 180 ° C. to melt. Next, by the method shown in FIG. 11, a convex polyolefin sheet 8 made of an electron beam crosslinked low density polyethylene sheet having a brick-shaped convex pattern on the surface was attached to a steel sheet pile 1 by a pressure roll 13 of the web portion and a corner of the web portion. The pressure-bonded roll 14, the pressure-bonded rolls 15 and 16 of the flange portion, and the pressure-bonded roll 17 of the claw portion are sequentially pressure-bonded to each other, and as shown in FIGS. 3 and 4, a polyolefin-coated steel having a brick-shaped convex pattern on the valley surface. I got a sheet pile. The color tone and the manufacturing method of the convex polyolefin sheet 8 made of the electron beam cross-linking convex low density polyethylene sheet having the brick convex pattern on the surface are the same as those in the case of Example 1.

Example 4 A valley surface of a steel sheet pile (SGPIII type × 5500 mm length) was grit blasted to remove rust, and a phosphoric acid / silica addition chromate treatment agent was added to the surface so that the total amount of deposited chromium was 100.
Roll coating to 0 mg / m ² and 10 at 50 ° C
Baked for minutes. Then, on its surface, bisphenol A
To 100 parts by weight of a mixture of 3% by weight of silica fine powder with 3% by weight of diglycidyl ether of dicyandiamide type curing agent (“Epicure 108FF” manufactured by Yuka Shell Epoxy Co., Ltd.) 7
1 part epoxy primer added with 3 parts by weight of an imidazole curing accelerator ("Curezol C ₁₁ Z" manufactured by Shikoku Kasei Co., Ltd.) by ironing to a film thickness of 50 µm, and at 250 ° C for 1 minute. It was heated and cured to form an epoxy primer layer. Next, a maleic anhydride-modified ethylene-4-methyl-1-pentene copolymer powder adhesive was electrostatically coated on the surface so that the film thickness was 400 μm, and heated to 220 ° C. to melt. Next, according to the method shown in FIG. 12, a convex polyolefin sheet 8 made of an electron beam cross-linked ethylene-4-methyl-1-pentene copolymer having a dot-shaped convex pattern on the surface was attached to the steel sheet pile 1.
The pressure-bonding roll 13 of the web portion, the pressure-bonding roll 14 of the corner of the web portion, the pressure-bonding rolls 15 and 16 of the flange portion, and the pressure-bonding roll 17 of the claw portion are sequentially pressed and bonded, and as shown in FIGS. A polyolefin-coated steel sheet pile having a dot-shaped convex pattern on its valley surface was obtained. Electron beam cross-linking convex pattern ethylene-4-methyl-1 having a dot-like convex pattern on the surface
The color tone and production method of the pentene copolymer are the same as in Example 2.

[0028]

According to the present invention, as is apparent from the above-mentioned Examples, the colored polyolefin layer and the convex surface are partially formed on the peak surface or the valley surface of the steel sheet pile 1 which has been subjected to the base treatment. A convex polyolefin sheet 8 composed of a laminated colored polyolefin layer is adhesively coated through a modified polyolefin adhesive layer to obtain a brick pattern of various tones, a convex pattern such as a dot pattern, etc. It is possible to provide a polyolefin-coated steel sheet pile that is easily environmentally friendly, and a colored polyolefin-coated steel sheet pile having the convex pattern can be manufactured by a simple means.

[Brief description of drawings]

FIG. 1 is a plan view showing a part of a polyolefin-coated steel sheet pile having a convex brick pattern on the mountain surface 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 convex brick pattern on the valley surface of the present invention.

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

FIG. 5 is a plan view showing a part of a polyolefin-coated steel sheet pile having a convex dot pattern on the mountain surface of the present invention.

FIG. 6 is a sectional view taken along line CC of FIG.

FIG. 7 is a plan view showing a part of the polyolefin-coated steel sheet pile having a convex dot pattern on the valley surface of the present invention.

8 is a cross-sectional view taken along the line DD of FIG.

FIG. 9 is a perspective view showing an example of a method for manufacturing a polyolefin-coated steel sheet pile having a convex brick pattern on the mountain surface of the present invention.

FIG. 10 is a perspective view showing an example of a method for manufacturing a polyolefin-coated steel sheet pile having a convex dot pattern on the mountain surface of the present invention.

FIG. 11 is a perspective view showing an example of a method for producing a polyolefin-coated steel sheet pile having a convex brick pattern on the valley surface of the present invention.

FIG. 12 is a perspective view showing an example of a method for producing a polyolefin-coated steel sheet pile having a convex dot pattern on the valley surface of the present invention.

FIG. 13 is a perspective view showing an example of a method for producing a polyolefin sheet having a convex brick pattern on the surface used for producing the polyolefin-coated steel sheet pile of the present invention.

FIG. 14 is a perspective view of a mold having a brick-shaped rectangular recess on the pressing surface.

FIG. 15 is a perspective view showing an example of a method for producing a polyolefin sheet having a convex brick pattern on the surface used for producing the polyolefin-coated steel sheet pile of the present invention.

FIG. 16 is a perspective view of a mold having a cylindrical recess on the pressing surface.

FIG. 17 is a cross-sectional view showing a part of a conventional polyolefin-coated steel sheet pile.

[Explanation of symbols]

 1 Steel Sheet Pile 2 Chromate Coating 3 Epoxy Primer Layer 4 Modified Polyolefin Adhesive Layer 5 Colored Polyolefin Layer 6 Partially Laminated Colored Polyolefin Layer 7 Steel Sheet Pile Transport Table Roller 8 Convex Polyolefin Sheet 9 Crimping Roll for Web Corner 10 Crimping roll for corner of web part 11 Crimping roll for flange part 12 Crimping roll for flange part 13 Crimping roll for web part 14 Crimping roll for corner of web part 15 Crimping roll for flange part 16 Crimping roll for flange part 17 Crimping roll for claw part 18 Colored polyolefin sheet 19 Heating device 20 Nozzle 21 Partially laminated colored polyolefin 22 Mold having a brick-shaped rectangular recess on the pressing surface 23 Mold having a cylindrical recess on the pressing surface

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification number Office reference number FI technical display location B32B 3/30 6617-4F 7/12 7188-4F 27/20 A 6122-4F 27/32 102 8115 −4F 31/08 7141−4F C09J 123/26 7107−4J // B29K 23:00 4F 105: 16 4F B29L 9:00 4F (72) Inventor Hirotada Kato 1 Kimitsu, Chiba City, Chiba New Nippon Steel Stock Company Kimitsu Works

Claims (8)

[Claims] 1. A colored polyolefin layer is laminated on a crest surface or a valley surface of a steel sheet pile subjected to a base treatment via a modified polyolefin adhesive layer, and a colored polyolefin layer is partially formed on the surface of the colored polyolefin layer. A polyolefin-coated steel sheet pile having a convex pattern characterized by being laminated in a convex shape. 2. The modified polyolefin adhesive layer comprises polyethylene or 1-butene, 4-methyl-1-pentene,
The convex pattern according to claim 1, characterized in that it comprises a modified product obtained by modifying any polyolefin of an α-olefin such as 1-hexene or 1-octene and ethylene with an acid anhydride such as maleic anhydride. Polyolefin coated steel sheet pile having. 3. A colored pigment in which the colored polyolefin layer is a polyolefin of polyethylene or a copolymer of α-olefin such as 1-butene, 4-methyl-1-pentene, 1-hexene, 1-octene and ethylene and ethylene. A polyolefin-coated steel sheet pile having a convex pattern according to claim 1, wherein the steel sheet pile is added. 4. The base treatment for a steel sheet pile is characterized in that a chromate film and an epoxy primer layer are laminated on the peak surface or the trough surface of a blasted steel sheet pile.
Polyolefin-coated steel sheet pile having a convex pattern. 5. 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 the colored polyolefin sheet is partially convexized in advance on the surface of the colored polyolefin sheet. The convex-shaped polyolefin sheet 8 laminated on the pressure-bonding roll 9 at the web portion, the pressure-bonding roll 10 at the corner of the web portion, and the pressure-bonding roll 1 at the flange portion.
1. A method for producing a polyolefin-coated steel sheet pile having a convex pattern, which comprises sequentially adhering 1 and 12. 6. A modified polyolefin adhesive powder is electrostatically coated on the valley surface of a steel sheet pile subjected to a base treatment and heated and melted, and then the colored polyolefin sheet is partially convex in advance on the surface of the colored polyolefin sheet. The polyolefin sheet 8 having a convex pattern laminated thereon is sequentially bonded by a pressure roll 13 for the web portion, a pressure roll 14 for the corners of the web portion, pressure rolls 15 and 16 for the flange portion, and a pressure roll 17 for the claw portion. A method for producing a polyolefin-coated steel sheet pile having a convex pattern. 7. The convex polyolefin sheet 8,
The colored polyolefin sheet 18 is heated by the heating device 19, and the melt of the colored polyolefin 21 measured using the nozzle 20 is extruded and placed at a preset position on the surface thereof, and then the brick-shaped rectangle is drawn from the surface. The method for producing a polyolefin sheet steel sheet pile having a convex pattern according to claim 5 or 6, wherein a brick pattern polyolefin sheet in which a convex brick pattern is formed by press molding with a mold 22 having a concave portion is used. 8. The convex polyolefin sheet 8,
The colored polyolefin sheet 18 is heated by the heating device 19, the melt of the colored polyolefin 21 measured by using the nozzle 20 is extruded and placed at a preset position on the surface, and then a dot-shaped cylinder is placed from the surface. A method for producing a polyolefin-coated steel sheet pile having a convex pattern according to claim 5 or 6, wherein a dot-patterned polyolefin sheet having a convex dot pattern formed by press-molding with a mold 23 having a concave portion is used.