JP3013228B2 - Volatile rust inhibitor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vaporized rust inhibitor used for rust prevention of metal such as hermetically packed vehicle body parts.

[0002]

2. Description of the Related Art Heretofore, dicyclohexylamine nitrite, dicyclohexylamine carbonate, benzotriazole and the like have been known as vaporizable rust inhibitors for metals. These may be used alone or in combination of two or more, impregnated in vaporized rust-proof paper, put in a breathable bag,
It is enclosed and used with metal products.

[0003]

The above-mentioned conventional vaporized rust preventives are effective in preventing rust of specific metals such as iron, iron alloys and copper, but have no rust preventive effect on other metals. Often not, and may adversely affect other metals. Also,
In the case of transporting the above metal products overseas, for example, there is a problem that the environment at the time of packing the product and the environment at the time of storage at the shipping destination change, and the generation of rust is promoted. Therefore, in recent years, there are few products made of a single metal, and many products are made of a combination of different metals. Therefore, development of a vaporized rust inhibitor effective for a wide range of metal products is required.

An object of the present invention is to solve the above-mentioned problems, and it is an object of the present invention to provide a vaporizable rust inhibitor which is effective for preventing rust of various metal products for a long period of time. is there.

[0005]

Means for Solving the Problems The vaporizable rust inhibitor of the present invention is characterized by containing butynediol. According to the study of the present inventors, 2-butyne-1,4
-Diol (hereinafter simply referred to as butynediol) has been found to exhibit an excellent rust-preventive effect on various metals. Butynediol acts as an antioxidant when it is vaporized and adheres in trace amounts to the metal surface.

[0006] In the present invention, various additives may be added to butynediol for use. For example, dimethyl maleate or the like having an action of accelerating the vaporization rate may be added to butynediol to promote the vaporization rate,
An antioxidant such as dibutylhydroxytoluene may be added to prevent oxidation of butynediol itself. Further, together with butynediol, a rust preventive such as dicyclohexylamine nitrite or benzotriazole which has a high rust preventive effect for a specific metal conventionally known may be used in combination.

In the present invention, butyne diol may be used without using an additive such as an accelerator for vaporization rate, an antioxidant or another rust inhibitor, or may be a paper or a predetermined base material made of an inorganic material. May be used. Examples of the paper include pulp and the like, and examples of the inorganic material include Sildex (trade name of Asahi Glass Co., Ltd.) and Florite Toksil (trade name of Tokuyama Corporation).
Alternatively, a material obtained by impregnating a predetermined base material with butynediol may be used by being housed in a breathable bag. Examples of such a bag having both air permeability and moisture permeability include paper, nonwoven fabric, and a porous polymer film (for example, polyethylene porous film manufactured by Nitto Denko Corporation, trade name: Breslon). It is preferable to use a bag that does not allow external moisture to pass due to its relatively high hygroscopicity. Usually, a product obtained by impregnating a predetermined base material with butynediol is contained in a gas-permeable bag, and is used in a state of being hermetically packed together with a metal product. The amount of butynediol used is sufficient as long as it fills the container in which the metal product is packed when vaporized.

[0008]

Embodiments of the present invention will be described below. As shown in FIG. 1, a paper 1 impregnated with 1 g of butynediol was placed in a bag 2
Was prepared. The bag 2 is formed by sealing a polymer porous film (trade name: Breslon, manufactured by Nitto Denko Corporation).

As shown in FIG. 2, a Petri dish 13 containing 50 cc of water 12 was placed on the bottom of a glass container 11 having a capacity of 2 L, and a metal test piece 14 was placed around the Petri dish 13. After attaching a thread tied to the bag 2 containing butynediol to the vinylidene chloride film 15 with a tape, the upper opening of the glass container 11 is sealed with the vinylidene chloride film 15, and the bag 2 is hung above the inside of the glass container 11. I can lower it. In this state, rust prevention tests were performed on various metals as described below. For comparison, rust prevention tests were performed on various metals in the same manner as in FIG. 2 except that no rust inhibitor was used.

Example 1 A zinc-plated iron plate of 70 mm × 150 mm was prepared and polished by half the thickness from one side to remove the zinc portion on one side.
This was washed with trichlene to prepare a test piece having an iron surface and a zinc surface, and a rust prevention test was performed.

When no rust preventive was used, about 10% of the area of both the iron surface and the zinc surface discolored on the second day. After 9 days, pale yellow-brown rust occurred on the entire surface of the iron surface, and the discoloration spread to about 20% of the area on the zinc surface.

When the vaporizable rust inhibitor of the present invention is used,
Even after 9 days, no discoloration was observed on both the iron surface and the zinc surface. Example 2 A 30 mm × 100 mm copper plate was immersed in an aqueous solution containing 4% of ammonium thioglycolate, 1.5% of triethanolamine and 0.7% of a surfactant at 50 ° C. for 5 minutes to remove an oxide film on the surface. After that, it was washed with water and dried to obtain a test piece. The surface of the copper plate subjected to such treatment is activated and easily oxidized.

When no rust inhibitor is used, the entire surface is discolored on the second day, and 60% of the area is bluish purple.
After a day, the entire surface turned blue-violet. When the rust preventive was used, 10% of the area was slightly discolored on the second day, and after 28 days, the entire surface was discolored but remained pale.

Example 3 A 30 mm × 100 mm brass plate was subjected to the same pretreatment as in Example 2 to obtain a test piece. Also in this case, the surface of the brass plate is activated and easily oxidized.

When no rust inhibitor was used, the entire surface lost its gloss on the second day and was covered with a thin yellow-green film after 9 days. When using a rust inhibitor, about 30% of the area on the second day
Lost its gloss and after 9 days the entire surface had lost its gloss, but only had a faint discoloration.

Example 4 A 30 mm × 100 mm aluminum plate was washed with alcohol and dried to obtain a test piece.

When no rust inhibitor was used, the entire surface corroded gray after 5 months. When the rust inhibitor was used, there was almost no discoloration even after 5 months, and the initial gloss was exhibited.

Example 5 A 30 mm × 100 mm brass plate was subjected to bright nickel plating, washed and dried to obtain a test piece.

When no rust inhibitor was used, the entire surface was lightly changed to blackish brown after 40 days. When the rust inhibitor was used, there was almost no change even after 40 days. Example 6 A 30 mm × 100 mm copper plate was plated with about 1 electroless tin.
The test piece was applied to a thickness of μm, washed and dried. When no rust inhibitor was used, the entire surface became whitish after 28 days. When the rust inhibitor was used, there was almost no change even after 28 days.

[0020]

As described above, the vaporizable rust inhibitor containing butynediol according to the present invention exhibits a good rust preventive effect on various metal products.

[Brief description of the drawings]

FIG. 1 is a diagram showing a bag containing paper impregnated with butynediol as a vaporizable rust inhibitor of the present invention.

FIG. 2 is a view showing a rust prevention test method using the vaporizable rust inhibitor of the present invention.

[Explanation of symbols]

1 ... paper impregnated with butynediol, 2 ... bag, 11 ... glass container, 12 ... water, 13 ... petri dish, 14 ... metal test piece, 15 ... vinylidene chloride film.

Claims (2)

(57) [Claims] 1. A vaporizable rust inhibitor comprising butynediol. 2. A vaporizable rust preventive wherein a base material impregnated with butynediol is contained in a breathable bag.