JPH01163284A - Tacky adhesive film for corrosion-protection of steel plate - Google Patents

Abstract

PURPOSE:To obtain the title film free from evaporation of a rustinhibitor from the film and effective even in a district having large temperature variation and a tropical district, by laminating a tacky adhesive plastic film layer compound with a tacky adhesive and vapor-phase inhibitor to a gas-barrier plastic film layer. CONSTITUTION:The objective film having double-layer structure can be produced by melting a mixture of (A) 70wt.% of powdery PE, (B) 20wt.% of a powdery vapor-phase inhibitor and (C) 10wt.% of a powdery tacky adhesive composed of dichlorohexylammonium nitrite, etc., applying the molten mixture to a surface of a gas-barrier plastic film such as polyester film and laminating the film with a tacky adhesive plastic film layer.

Description

[Detailed Description of the Invention] A. Purpose of the Invention [Industrial Field of Application] The present invention aims to solve the problem in that when steel plates for automobiles and other various steel plates are transported from a steel factory to a remote location, rust occurs on the surface of the steel plates. This relates to a rust-preventing film that is applied to steel plates to prevent rust.

[Conventional technology]

The surface of steel plates is susceptible to rust, so when transporting steel plates to remote locations over long periods of time by ship, railway freight car, etc., the steel plates must be tightly wrapped in waterproof paper to protect them from rainwater, moisture, dust, etc. ing.

[Problem that the invention seeks to solve]

However, due to the temperature difference between day and night or when passing through tropical regions, dew condensation occurs on the surface of the steel plate, and it is inevitable that the moisture caused by the condensation will cause rust to some extent.

Rust-preventing films made by adding volatile rust inhibitors (e.g. dicyclohexylammonium nitrite) to ordinary polyethylene films are commercially available and are widely used for packaging items that are prone to rust. Even if the surface of the steel plate was covered, it was not possible to prevent rust from forming.

A possible reason for this is that the above-mentioned anti-rust film does not adhere closely to the surface of the steel plate, creating an air space between the film and the steel plate, and the surface area of the steel plate as a raw material is large.
This is because the amount of air in the entire air layer is quite large, and the rust-preventing gas emitted from the film becomes diluted, making it ineffective.

Rust-preventing gas also emanates from the surface side of the rust-preventing film that covers the steel plate, so it is necessary to wrap the steel plate over it in order to suppress this. In other words, double packaging is required, which is time-consuming.

An object of the present invention is to provide a rust-preventing film that solves the above-mentioned problems in conventional steel plate packaging.

Summary: Structure of the Invention [Means for Solving the Problems] In order to achieve the above-mentioned object, the present invention provides an adhesive plastic film comprising a rust-preventing film mixed with an adhesive and a volatile rust inhibitor. It is characterized by having a two-layer structure consisting of a layer and an air-impermeable plastic film layer.

[For production]

The film of the present invention is applied to the surface of a steel plate with the adhesive plastic film layer inside, and it adheres closely to the steel plate due to its adhesive properties. Even though the film adheres to the steel plate, it does not adhere completely, and microscopically, a space remains.

Therefore, the above space is filled with the emitted rust inhibitor gas,
Although the amount of the gas is small, it comes into contact with the moisture attached or adsorbed on the surface of the steel plate due to dew condensation, becomes an aqueous solution, and exhibits a rust-preventing effect.

Emission of rust inhibitor gas to the side opposite the steel plate is inhibited by the impermeable plastic film layer.

〔Example〕

FIG. 1 shows a cross-sectional view illustrating the structure of the adhesive film for preventing rust on steel plates according to the present invention, in which an adhesive plastic film layer 1 is formed by adding and blending an adhesive and a volatile rust inhibitor;
It consists of two layers: a non-breathable plastic film layer 2;

The two-layer film 3 uses, for example, a polyester film as the air-impermeable film layer 2, and forms a film layer by using the polyester film 2 as a base and pouring a molten stock solution of the adhesive plastic film 1 thereon. The polyester film 2 is not air permeable and at the same time strong, so it is suitable as a base material for the film of the present invention.

The adhesive plastic film layer 1 is prepared according to the following formulation.

Powdered polyethylene 70% by weight Powdered volatile rust inhibitor 20% by weight (e.g. dicyclohexylammonium nitrite manufactured by Chrest Chemical Co., Ltd.)
Product name T, V, I) Powder adhesive
10% by weight (for example, Cemedine powder manufactured by Cemedine Co., Ltd.) is mixed and heated to melt. This molten material is poured onto the polyester film as described above.

The adhesive surface of the two-layer film 3 of the present invention is attached to the surface of a steel plate, but for handling and storage, it is convenient to wind it into a roll. In that case, in order to prevent the adhesive surface from sticking to other surfaces, a female pattern paper 4 is pasted on the adhesive surface as shown in FIG.

Note that the materials for the adhesive plastic film layer 1 and the non-air permeable plastic film layer 2 are not limited to those in the above embodiments.

The rust-preventing adhesive film of the present invention is mainly applied to steel plates, but it can also be applied not only to steel plates but also to various other steel materials.

C. Effects of the invention As mentioned above, the adhesive film for rust prevention of steel plates of the present invention has two layers: an adhesive plastic film layer made of an adhesive and a volatile rust inhibitor, and a non-porous plastic film layer. Since the steel plate is wrapped with this adhesive film, the rust inhibitor gas dissolves into the moisture generated by condensation in the small space remaining between the steel plate surface and the film. This prevents the formation of rust, and the rust preventive agent does not radiate outward, eliminating the need for double packaging and allowing the product to be stored in areas with large temperature differences between day and night, or when passing through tropical regions. Steel plates do not rust during transportation and can be delivered to their destinations in beautiful condition.

[Brief explanation of the drawing]

FIG. 1 is an enlarged longitudinal cross-sectional view showing the basic structure of the adhesive film for preventing rust on steel plates of the present invention, and FIG. 2 is an enlarged longitudinal cross-sectional view showing the structure with release paper. 1 is an adhesive plastic film layer, 2 is an impermeable plastic film layer, 3 is a rust-preventing adhesive film, and 4 is a release paper. Figure 1 Figure 2

Claims (1)

[Claims] 1. An adhesive film for preventing rust on steel sheets, characterized by a two-layer structure: an adhesive plastic film layer made by adding and blending an adhesive and a volatile rust inhibitor, and an air-impermeable plastic film layer.