JPH0620603Y2 - Synthetic resin coated metal body - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a rust preventive coating on a metal surface such as an iron wire or a steel pipe.

[Conventional technology]

BACKGROUND ART Conventionally, iron wires, steel pipes, etc. have been plated on their surfaces for rust prevention, coated films with various paints, and coated with synthetic resins.

[Problems to be solved by the invention]

However, in any of the above rust-proofing treatments, if a cut rust-proof film or synthetic resin layer or the like has a cut, it is inevitable that water will penetrate from there and corrode the surface of the iron wire, steel pipe, or the like. .

In particular, iron wires are often braided and used for protection fences, etc. Even if the surface of the iron wire coated with synthetic resin is clean, the iron inside rusts from small scratches, which causes the strength to decrease and may lead to unexpected accidents. There was also a fear of being connected.

Recently, high-strength fences have been required. That is, using hard steel wire as the core material,
Various measures have been taken, such as reducing the amount of plasticizer so that the surface does not easily get scratched, and applying a polyvinyl chloride coating layer with increased surface hardness.However, if the core material is hard, spatula scratches will occur. It was easy to enter, which caused rusting of the steel wire of the core material.

[Means for solving problems]

In order to solve such a problem, the present invention provides a synthetic resin-coated metal body in which a water-swellable resin layer is provided on the surface of a metallic core material, and a synthetic resin protective layer is further formed on the outer periphery thereof.

[Action]

Such a synthetic resin-coated metal body, when the synthetic resin layer on the outer surface is damaged, water such as rain enters from the wound, and the water-absorptive resin absorbs water into the resin before oxidizing the metal inside, It expands and closes the wound, prevents moisture from entering, and prevents metal corrosion.

〔Example〕

 Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a sectional view of a coated iron wire, which is one embodiment of the synthetic resin-coated metal body of the present invention. Reference numeral 1 is an iron wire, and 2 is a water-swellable resin layer coated on the outer circumference of the iron wire 1. Three
Is a synthetic resin protective layer coated on the outer periphery of the water-swellable resin layer 2, and a resin such as polyvinyl chloride, polyethylene, polypropylene, or polycarbonate is preferably used.

For the water-swellable resin 2, a vinyl alcohol / acrylic acid copolymer or the like can be used. These resins may be blended with soft polyvinyl chloride, ethylene vinyl acetate, rubber or the like and extrusion-coated. The blending ratio is preferably 30% by weight or more of the water-absorptive expanded resin with respect to the resin such as soft polyvinyl chloride. At this time, it is necessary to take sufficient care in handling during production so that the water-swellable resin does not contain water. Regarding the thickness of the iron wire, for example, a wire used for a fence often has a diameter of 2.3 mm to 4.0 mm, and at that time, the thickness of the water-swellable resin may be about 0.1 mm to 0.4 mm. The outermost synthetic resin coating layer 3 is usually 0.3 mm to 0.8 m, though it varies depending on the application and the type of resin.
About m is sufficient.

FIG. 2 is an embodiment of the present invention and shows a sectional view of a coated steel pipe.

Reference numeral 11 is a steel pipe, 12 is a water-swellable resin layer, and 13 is a synthetic resin protective layer such as polyvinyl chloride or polyethylene.

The water-swellable resin layer 12 and the synthetic resin protective layer 13 coated on the steel pipe 11 have almost the same thickness and the same kind of resin. 1 and 2, when the synthetic resin protective layers 3 and 13 are scratched, the water-swelling expansive resins 2 and 12 of the underlayer are exposed on the surface, so that the protective layer and the underlayer have the same color. If you leave it on, the scratches will be inconspicuous.

[Effect of device]

In the present invention, a water-swellable resin is provided on the surface of a metallic core material such as an iron wire or a steel pipe, and a protective layer of synthetic resin is coated on the outer periphery of the resin, so that the outer peripheral protective layer is scratched. However, since a small amount of water is received from it, the water-swellable resin gradually expands at the scratched part and closes the wound, so that water enters from the wound and rusts on the metal surface as in the past. It has the effect that it will not progress steadily. Therefore, when the coated metal body of the present invention is used for fences, agricultural and horticultural columns, etc., rust does not rapidly occur due to scratches on the surface of the coating layer, so it can be used for a long period of time, and it is a fence for rockfall prevention etc. There is an advantage that it can be used with confidence in fences for dangerous goods and dangerous places.

[Brief description of drawings]

FIG. 1 is a sectional view of a coated iron wire showing an embodiment of the present invention, and FIG.
FIG. 1 is a sectional view of a coated steel pipe showing an embodiment of the present invention. 1 ... Iron wire, 2 ... Water-swellable resin layer, 3 ... Synthetic resin protective layer.

Claims (1)

[Scope of utility model registration request] 1. A synthetic resin-coated metal body comprising a water-swellable resin layer provided on the surface of a metallic core material, and a synthetic resin protective layer formed on the outer periphery thereof.