JPS6043493A - Discoloration inhibitor for copper - Google Patents

Abstract

PURPOSE:To obtain a discoloration inhibitor for copper-base metal showing its effect in the temp. range of ordinary temp. to a high temp. by adding an alkanolamine to a mixture of benzotriazoles with oxycarboxylic acids and bringing them into a reaction. CONSTITUTION:An alkanolamine such as mono-, di- or triethanolamine, mono-, di- or tripropanolamine is added to a mixture of 2-30pts. benzotriazoles such as benzotriazole and methylbenzotriazole with 70-98pts. oxycarboxylic acids such as lactic acid, glycolic acid and tartaric acid, and they are brought into a reaction. The resulting reaction product is uniformly dissolved in an alcoholic solvent, and the soln. is adjusted to 3.0-9.0pH. A discoloration inhibitor for copper-base alloys showing its effect in the temp. range of ordinary temp. to 150-200 deg.C high temp. is obtd.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a discoloration inhibitor for copper-based metals that has excellent effects at temperatures ranging from room temperature to high temperatures. More specifically, copper containing as an active ingredient a reaction product of a mixture of 2 to 30 parts of benzotriazoles and 70 to 98 parts of oxycarboxylic acids and adjusted to pH 3.0 to 9.0 with an alkalamine. This invention relates to a discoloration inhibitor for metals.

Conventionally, benzotriazole has been most commonly used as a discoloration inhibitor for copper-based metals. Although benzotriazole has an excellent ability to prevent discoloration at temperatures below 100°C, it cannot prevent discoloration due to oxidation of copper-based metals at temperatures above 100°C. Also, the heat resistance is 4
Chlorpenttriazole has been proposed as a discoloration preventing agent, but this also does not have a sufficient discoloration preventing effect.

The present inventor has developed a heat-resistant discoloration inhibitor that has sharp and σ
After repeated research, the present invention was completed.

An object of the present invention is to propose a chemical agent that prevents discoloration of M-based alloys even at high temperatures such as 150-200'C.

Benzotriazole can prevent discoloration of copper-based metals at relatively low temperatures below 100'
Above C, there is almost no effect.

On the other hand, oxocarboxylic acid has a very weak discoloration prevention effect on copper-based metals at around l:';'IIL°<, 10
It is a special compound that only becomes resistant to discoloration at Bm above 0°C.

In this way, by using both substances with different actions and effects, it can be used in a temperature range from room temperature to high temperature.
It has the effect of preventing discoloration.

The anti-discoloration agent according to the present invention is a c17. Compound D can be obtained by adding and reacting an alkanonylamine. The reaction includes
A solvent such as water or a solvent may or may not be added. Since heat is generated when alkanolamino is added, if the heat is likely to increase, it is recommended to adjust the reaction humidity by external cooling B. The reaction product has the best effect when it is uniformly dissolved in an alcohol-based solvent to treat the surface of the copper-based alloy.
If the value is adjusted from 0 to 90, excellent effects can be obtained even when treated as an aqueous solution with β1. Considering economic efficiency, Inn i
The most advanced method is to treat the surface of copper-based metals with aqueous solutions.

When the pH is below '50 F, it has excellent effects when treated with organic solvents, but when treated with aqueous solutions, it is difficult to obtain a uniform rust-preventive coating, often becoming uneven, and discoloration at high temperatures. There are drawbacks such as poor prevention effect, and when the pH is 90 or higher, the uniformity of the treated surface is good, but the discoloration prevention effect is significantly inferior even at 61 or high temperature.

Alkanolamines are characterized by low vapor pressure and weak atomization, and have no oxidation or g ta at all with respect to copper-based metals. Ami/ other than alkanolami/ is
Many have a strong amino odor, and some promote discoloration of copper-based metals, making them impractical.

The treatment concentration of the discoloration inhibitor according to the present invention is from 50 to 500.
It is effective to use it within a range of 0.00 ppm. 50
If the concentration is less than PPM, the effect of preventing discoloration at high temperatures will be poor, and if the concentration is more than 5,0000 ppm, the film formed on the copper surface will become thicker, making it difficult to obtain a uniform treated film.
However, the anti-discoloration effect is not further improved. The combined ratio of benzo-1-lyazole and oxycarboxylic acids is 2 to 30 parts of Sλ
When the amount of chinocarbo/acids is in the range of 70 to 98 parts, the effect of preventing discoloration in dry and wet conditions and at high temperatures is excellent.For other combination ratios, when the amount of benzotriazole is less than 2 parts, the effect of preventing discoloration at room temperature is excellent. If the amount of benzotriazole exceeds 3 parts, the effect of preventing discoloration at product temperature becomes poor, which is not preferable.

The benzotriazoles according to the present invention include benzotriazole, methylbenzotriazole, ethylbenzotriazole, chlorbenzo) 11 asole, carboquine benzotriazole, etc.
! Can contain lactic acid, glycolic acid, gulfuric acid, tartaric acid, malic acid, citric acid, hydroxycaprylic acid, etc. In addition, as alkanol amino,
Examples include di-triethanolamine, mono-triethanolamine, butanolamine, di-methylaminoethanol, and the like.

The anti-discoloration agent of the present invention is used in fields where heat resistance is required. For example, it can be used in fields such as surface treatment of gil foil, surface treatment of substrates, electronic parts surface treatment, and electric wire surface treatment.

The present invention will be specifically explained with reference to Examples, but the present invention is not limited thereto.

Example Copper plate (50X100X, 11+im) was dissolved in 1N hydrochloric acid for 60 minutes.
After soaking in cedar, it was washed with water, washed with Mek/L, and dried. This body plate was used as a test piece and was immersed in an aqueous solution of the product of the present invention shown in Table 1 for 10 minutes and then dried.

The test piece was heated at 150±2'C for 90 minutes and the degree of discoloration was observed. In addition, the temperature is 40±1'C and the temperature is 95±.
51 copies were left at 27°C and the degree of discoloration was observed. Table 2 shows the results.
It was shown to. Note that the values in Table 2 are based on the JIS K2513 copper plate corrosion classification table.

As is clear from the above results, it was found that the present invention has an excellent discoloration prevention effect at room temperature and high temperature.

Patent Applicant Chiyoda Chemical Research Co., Ltd., Laboratory Procedures Amendment (Method) % Formula % 1, Incident Indication Patent Application No. 152168a, filed in 1982
Title of the invention: Copper discoloration inhibitor 3. Relationship with the case of the person making the amendment: Patent applicant 11-3 4. Date of amendment order: Initiator 5. Subject of amendment: Description 6. Contents of the amendment: As shown in the attached sheet.

Contents of the supplement @Book i (6) 15th line from the top of page “It says the temperature is 95±zq’tJ, Correct it to "humidity 95±2%."

Claims (1)

[Claims] +1+ A mixture of 2 to 30 parts of benzotriazoles and 70 to 98 parts of oxycarboxylic acids is added to an alkali/
A heat-resistant 2(4-karat gold WS discoloration inhibitor) containing a reaction product of PI(3,0 to 9.0) as an active ingredient.