JPH0379780A - Rust preventive packaging material - Google Patents

Abstract

PURPOSE:To obtain a packaging material for metallic products causing no clouding to the metallic material to be packaged and excellent in rust-preventing effect by incorporating specific metal oxide in a sol state to a rust-preventing packaging material for metallic products having specular gloss. CONSTITUTION:As a packaging material for various metallic products, alloy products, plated products, etc., having surfaces with specular gloss, a packaging material prepared by impregnating, e.g. kraft paper for package with the amine salt of nitrous acid or carboxylic acid, metallic salt, triazole kind, etc., as rust- preventing agents and further incorporating 0.01-10wt.% of metal oxide in a sol state, such as alumina sol, zirconia sol, and silica sol, to the above rust- preventing agents is used. At this time, an adhesive, such as casein, soybean protein, and oxidized starch, is further added to the above rust-preventing agents, by which the adhesive strength of the rust-preventing agents to the kraft paper, etc., as packaging material can be strengthened. By this method, superior rust-preventive materials causing no clouding to the specular gloss of metals can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a rust-proof packaging material. In particular, the present invention relates to a rust-proof packaging material that is effective for rust-proof packaging of metal products having cast-surface luster by adding innovation to the rust-preventing agent composition used in the production of the rust-proof packaging material.

[Conventional technology]

Traditionally, methods of suppressing corrosion by wrapping metal products with anti-rust packaging materials such as anti-rust paper and anti-rust films, or using them as mounts have been widely practiced and have greatly contributed to preventing corrosion of metals. are doing.

[Problem that the invention seeks to solve]

However, when metal products with specular luster are packaged in anti-rust packaging, a so-called "cloudy" phenomenon may occur, which may impair commercial value.

This cloudy phenomenon is suppressed. To this end, measures have been taken such as reducing the amount of rust preventive applied to base materials such as paper and restricting packaging methods to prevent it from coming into close contact with metal surfaces, but these measures are not satisfactory. In particular, when used as a mount, adhesion is unavoidable, and it is necessary to select a rust preventive agent that causes less clouding, and the only way to do this is to reduce the amount applied to the base material.

On the other hand, when paper is coated or impregnated with a rust preventive agent, the strength of the resulting rust preventive packaging material decreases.

In particular, when the humidity increases, such as during rainy weather, the strength decreases, and this is even more noticeable when fatty acids are included as a rust preventive agent.

[Problem to be solved by the invention]

As a result of intensive studies on rust preventive compositions that suppress the clouding phenomenon of conventional rust-proof packaging materials, the present inventor succeeded in solving the problem by incorporating a specific substance, and at the same time, The present invention was completed based on the discovery that the strength reduction of paper impregnated with a rust preventive composition can be suppressed by incorporating the same.

That is, the present invention provides a rust-proof packaging material in which a base material is impregnated and coated with a rust-preventive agent or a rust-preventive composition containing a rust-preventive agent and an adhesive as main components. This is a rust-proof packaging material characterized by containing a sol-like metal oxide.

[Means to solve the problem]

The metal products that are subject to rust-proof packaging in the present invention include steel, copper and copper alloys, aluminum and aluminum alloys, zinc, and various plated products. metals may coexist. Furthermore, it is also effective when applied to composite products of metal and plastics.

The rust inhibitors constituting the rust preventive composition of the present invention may be those commonly used for metals or metal products such as steel, copper and copper alloys, aluminum and aluminum alloys, zinc, and various plated products. , there are no restrictions. That is, for steel, amine salts and metal salts of nitrous acid and carboxylic acids are used, for copper metals, triazoles are used, and for zinc, pyrazoles, etc., as seen in Patent No. 1136557, are used. Ru.

On the other hand, the sol-like metal oxides that characterize the present invention include:
Alumina sol, zirconia sol, silica sol, etc. can be used, but among these, silica sol is particularly excellent. The shape of the silica sol does not need to be specified, such as spherical or amorphous. As a method for stabilizing the dispersed fine particles, methods applied to commercially available products, such as a method of creating an electric double layer with sodium ions or ammonium ions, or treatment with aluminum or amine, can be used.

The amount of the sol metal oxide added to the rust inhibitor may be 0.01 to 10% as an active ingredient, preferably 0.1 to 5%.
%. If the amount is less than this range, the effect sought by the present invention cannot be obtained. On the other hand, if it exceeds this range, the effect is leveled out and it is not only economically wasteful, but also, if it is used in coexistence with a rust preventive agent, precipitation will occur, which will impede impregnating and coating the substrate, which is not preferable.

The rust preventive composition of the present invention is characterized in that a sol metal oxide is blended into a rust preventive agent or a mixture of a rust preventive agent and an adhesive. As an adhesive, casein,
Water-soluble adhesives such as soybean protein, oxidized starch, modified starch, and polyvinyl alcohol, and synthetic resin latexes such as styrene-butadiene latex and methyl methacrylate-butadiene latex are used. There is no particular problem in adding surfactants, viscosity modifiers and other auxiliary agents to this rust preventive composition for the purpose of improving the workability of impregnating and coating the substrate.

A rust preventive composition containing a rust preventive agent or a rust preventive agent and an adhesive as main components and a sol metal oxide is applied to a base material by a normal coating method such as a roll method or a printing method. ,
The rust-preventive packaging material of the present invention is obtained 6. Then, the rust-preventive composition is applied in the amount required when no sol metal oxide is included, and the amount of the rust-preventive composition is applied depending on the type of target metal and the rust-preventive packaging material. You can decide freely depending on how you use it.

As a base material, paper such as kraft paper, roll paper, high-quality paper, etc.
Sheet-like materials such as resin-impregnated paper, nonwoven fabric, and plastic film based on these materials are used, and composite materials made by combining these materials can also be used.

〔Example〕

Further, the present invention will be explained by examples.

Example 1 Various commercially available sol metal oxides were added to an aqueous solution containing 10% of 3.5-dimethylpyrazole, a rust preventive agent for zinc, which is a component described in Patent No. 1136557, at a ratio of 1 to the rust preventive agent.
%-containing rust preventive composition liquid was prepared. This rust preventive composition liquid was applied to unbleached kraft paper with a basis weight of 100 g/m'' to obtain the rust preventive paper of the present invention.

A commercially available galvanized steel sheet was wrapped in this anticorrosion paper, and a corrosion acceleration test was conducted using a wet tester. The test results are shown in Table 1. Pyrazole, the only rust preventive agent for zinc, causes clouding5, while the inclusion of sol-like metal oxides can prevent galvanized steel sheets from rusting at the same time. The coexistence effect of sol-like metal oxides is definitely recognized.

Example 2 A rust preventive composition liquid was prepared by adding 1% of a sol metal oxide to an aqueous solution containing 20% of a steel plate rust preventive agent consisting of sodium nitrite and dicyclohexylammonium nitrite in the same manner as in Example 1. This rust preventive composition liquid was used in the same manner as in Example 1 to obtain rust preventive paper of the present invention.

A cold-rolled steel plate was wrapped in this anticorrosion paper and a corrosion acceleration test was conducted using a wet tester. The test results are shown in Table 2, and the inclusion of the sol-like metal oxide not only prevents the cold-rolled steel sheet from rusting, but also causes no clouding, clearly demonstrating the coexistence effect of the sol-like metal oxide.

Note that the evaluation criteria for the test results are the same as in Example 1.

Example 3 Regarding the case where the content of the silica sol, which was particularly excellent in Example 1.2, in the rust preventive composition liquid was changed,
A corrosion acceleration test was conducted in the same manner as in Example 1. The test results are shown in Table 3. When the content of silica sol is less than 0.01%, the effect of silica sol is insufficient;
Exceeding this range caused precipitation in the antirust composition solution, making it difficult to use. Note that the evaluation criteria for the test results are the same as in Example 1.

Example 4 A rust preventive composition liquid was prepared by blending various commercially available sol-like metal oxides with varying contents into an aqueous solution containing 20% sodium caprate as a rust preventive agent. This rust preventive composition liquid has a basis weight of 75g.
/m'' unbleached kraft paper to obtain the anticorrosion paper of the present invention.

The tensile strength of this anticorrosion paper was measured at an environmental humidity of 80%. The tensile strength of unbleached kraft paper as a blank was measured at environmental humidity of 80% and 65%. The test results are shown in Table 4, and it can be clearly seen that the addition of the sol metal oxide has the effect of suppressing the decrease in strength of the anticorrosion paper.

Table 1 Test results of Example 1 Table 2 Test results of Example 2 Table 3 Test results of Example 3 Table 4 Test results of Example 4 [Effects of the invention] According to the present invention, the rust preventive agent Alternatively, products containing metal can be packaged with a rust-proof packaging material obtained by impregnating and applying a sol-like metal oxide to a rust-preventive composition containing a rust preventive agent and an adhesive as main components. This makes it possible to suppress the occurrence of clouding without impairing the rust prevention effect. As a result, it is now possible to package products that do not want to be covered with rust-proof packaging, which could not be done in the past, expanding the scope of use of rust-proof packaging materials, and improving the use of products such as avoiding close contact during packaging. The restrictions will also be removed.

Further, by blending a sol-form metal acid monomer into a rust preventive composition that causes a decrease in paper strength, it is possible to suppress a decrease in paper strength and improve packaging workability.

Claims (1)

[Claims] In a rust-preventing packaging material obtained by impregnating and applying a rust-preventive agent or a rust-preventive composition mainly composed of a rust-preventive agent and an adhesive onto a base material, a sol-like metal oxide is added to the rust-preventive composition. A rust-proof packaging material characterized by containing: