JPH0718027B2 - Anti-corrosion paint - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rust preventive paint for rust prevention of iron materials such as coil iron core single plate and rust preventive of Jarman Silver (Western silver).

[0002]

2. Description of the Related Art As this kind of rust preventive paint, there is, for example, the one described in Japanese Patent Publication No. 61-47908 previously proposed by the present applicant. In this conventional technique, 0.5 to 2 parts of water, 0.2 to 0.6 parts of nitrite of sodium nitrite or potassium nitrite, and 0 to 3 parts of tripropylamine are used for 100 to 1000 parts of liquid alcohol such as ethyl alcohol or methyl alcohol. 0.5 to 3 parts of water, 100 to 1000 parts of liquid alcohol of ethyl alcohol or methyl alcohol, and nitrite salt of sodium nitrite or potassium nitrite. 0.2 ~
It is a rust preventive coating material containing 0.6 parts, 0.1 to 2.0 parts of tripropylamine and 0.1 to 2.0 parts of tributylamine, respectively.

[0003]

The above-mentioned conventional technique has a good rust-preventing effect for about one year after the production, but after about one year and three months after the production, fine tri-radial precipitation is formed on the bottom of the storage bottle. It has been found that there is a problem that the substance is settled and accumulated, the anticorrosive effect is significantly reduced, and the pipe is clogged with the above-mentioned deposit during anticorrosion coating in the ultrafine pipe.

Although the composition of the above-mentioned precipitate is not clear, it is considered that the nitrite grows and precipitates in a three-pronged radial pattern with the aid of tripropylamine, tributylamine, etc., using nitrite particles as nuclei.

In any case, the above-mentioned conventional rust preventive coating composition gradually deteriorates in rust preventive effect after a lapse of about one year from the production,
The use of inexpensive methyl alcohol causes environmental pollution due to the vapor, which is particularly harmful to the human body. Therefore, there is a problem in that expensive and nontoxic ethyl alcohol must be used.

In order to eliminate the above-mentioned problems, it is an object of the present invention to inexpensively provide a large amount of rust preventive paint capable of maintaining a rust preventive effect for a long period of time after production.

[0007]

The above-mentioned object of the present invention is to dissolve 1 to 5 parts of nitrilotriethanolamine by dissolving 1.0 to 4.0 parts of nitrite such as sodium nitrite in 20 to 100 parts of water. In addition to being dissolved, mixed with 1000 parts of isopropyl alcohol
It can be achieved by adding 1 to 5 parts of -butylamine and mixing.

[0008]

[Working] Explaining the reason for limiting each component from the aspect of action, isopropyl alcohol is used as a diluent, but its quick-drying property and permeation-diffusion property form the characteristics of this paint, and water dissolves nitrite. However, with respect to 1000 parts of isopropyl alcohol, it is difficult to dissolve the nitrite when the amount is 20 parts or less, and when 100 parts or more, P
H decreases and becomes cloudy as an emulsion.

Nitrite is used for rust prevention, and is 1.0
If the amount is less than 10 parts, the rust preventive effect is reduced, and if it is more than 4.0 parts, the applied part crystallizes white when dried and is not deliquescent at high humidity.

And, tri-n-butylamine is used as an inhibitor or inhibitor together with rust prevention.
It is necessary to be within the range of the part.

Nitrilotriethanolamine can prevent the phenomenon that nitrite grows out in a radial trifurcation as described above.

[0012]

EXAMPLES Next, examples will be described. Example 1 ₂ g of Toho NaNo ₂ (sodium nitrite) was added to H ₂ O.
(Water) 20 cc is mixed at room temperature and dissolved by stirring. …… Sample 1 Maki 4 g of nitrilotriethanolamine is added to and mixed with the above sample 1 in a normal temperature atmosphere. .. Sample 2 Haruka Sample 2 was mixed with 1000 cc of isopropyl alcohol, and 4.5 cc of tri-n-butylamine was added and mixed in a room temperature atmosphere to obtain an anticorrosive coating material of the present invention.

In this example, a cold-rolled steel plate was polished until it became shiny, and the above-mentioned anticorrosive paint was applied. After drying, 0.1 g of potassium ferricyanide (red blood salt) was dissolved in 2 cc of water to obtain 1 drop of indicator (0.05 cc). ) Although it was dropped, it was non-reactive, so the steel plate surface was scratched with a blade, but it was non-reactive.

In the same test, untreated steel sheet had an ionic reaction (50 ° C. at 61 ° C.) with clear spots after 50 seconds.
%) The anticorrosive coating according to this Example 1 was sprayed or dipped to obtain a core plate, pure iron sheet, round bar surface, Jarman silver sheet surface, copper sheet with an anticorrosive coating of 0.1 to 0.5 μm. After forming the above material, leaving it for 4 months in a high temperature and high humidity atmosphere in a constant temperature and humidity chamber at a temperature of 49 ° C ± 1 ° C and a relative humidity of 95%, and then taking it out and examining the sharpened portion, both macroscopic observation and microscopic observation were performed. No rust was found, including cracks in the rust preventive film, and the rust preventive paint film was not peeled off unless the material was scratched with a blade.

In this case as well, a rust indicating test was conducted with a mixed solution of 0.1 g of potassium ferricyanide (red blood salt) and 2 cc of water, but no indicating reaction was observed and a perfect rust preventive effect was confirmed. It was

The above rust-preventive coating is colorless and transparent as a whole immediately after its production and after 2 years, and is free from emulsions, precipitates, loose substances, etc., and is stable with no chemical or physical change with time. Met. Example 2 1 g of Toho NaNo ₂ (sodium nitrite) was added to H ₂ O.
Mix 70 cc of (water) at room temperature and stir to dissolve. …… Sample 1 Maki 1 g of nitrilotriethanolamine is added to and mixed with the above sample 1 in a normal temperature atmosphere. .. Sample 2 Harm Sample 2 was mixed with 1000 cc of isopropyl alcohol, and 1.5 cc of tri-n-butylamine was added and mixed in a room temperature atmosphere to obtain an anticorrosive paint according to Example 2 of the present invention.

In this example as well, the cold rolled steel sheet was polished until it became shiny, and the rust preventive paint was applied and dried, and then one drop (0.05 cc) of the above indicator was dropped, but since it was non-reactive, the steel sheet surface was drawn with a blade. It was scratched but unresponsive.

In the same test, untreated steel sheet had an ionic reaction (50 ° C. at 61 ° C.) with clear spots after 50 seconds.
%) The rust-preventive coating according to this Example 2 was coated with a rust-preventive coating of 0.1 to 0.
5μm formed, the above material temperature 49 ℃ ± 1 ℃ relative humidity 9
After leaving it in a high temperature and high humidity atmosphere in a 5% constant temperature and humidity chamber for 4 months, it was taken out and the tip was inspected, and no cracks or rusts were observed in the rust preventive coating both with the naked eye and under the microscope.
The anticorrosive paint film did not peel unless the material was scratched with a carbon steel knife.

Also in this example, there was no rusting indicating reaction in the rusting indicating test of the mixed solution of potassium ferricyanide and water with the above indicator.

Immediately after the production of the rust-preventive paint and after 2 years, the rust-preventive paint was colorless and transparent as a whole, and no emulsions, precipitates, loose substances, etc. were formed, and there was no chemical or physical change with time and it was stable. Met.

Note that other nitrites such as potassium nitrite may be used instead of sodium nitrite.

[0022]

Since the present invention is constructed as described above, it has the following effects. Since 1 to 5 parts of nitrilotriethanolamine was mixed in about 1000 parts of the anticorrosion paint, it is possible to reliably prevent the formation of the tridentate radial crystal deposit material in the above-mentioned conventional technique for a long period of time, and also to obtain the desired anticorrosion effect. The great effect of being able to guarantee for a long time was obtained.

In particular, according to the present invention, it is possible to provide a large amount of a colorless and transparent rust preventive which is stable and stable against changes in temperature and chemical / physical changes such as ultraviolet rays without aging change of rust preventive effect. There are many advantages, and its industrial effect is great.

Claims (1)

[Claims] 1. 1.0 to 4.0 parts of nitrite such as sodium nitrite is dissolved in 20 to 100 parts of water, and 1 to 5 parts of nitrilotriethanolamine is added and dissolved therein, and 1000 parts of isopropyl alcohol is added. A rust preventive paint obtained by mixing and further adding 1 to 5 parts of tri-n-butylamine and mixing.