JPH11250744A - Rustproof processing method for conductor for outdoor distribution line - Google Patents

Abstract

PROBLEM TO BE SOLVED: To uniformly form a BTA protection film and to improve corrosion resistance by extending a conductive material for an outdoor distribution line and by rustproof processing it with BTA after cleaning it by vapor of a specific pressure containing a specific density of benzatriazole and its derivative (BTA). SOLUTION: A rough drawing copper wire of a conductive material for an outdoor distribution line composed of copper or copper alloy is continuously extended into a prescribed line diameter. The obtained wire rod is cleaned by being exposed to vapor of pressure 5.0-1.0 kg/cm<2> containing BTA: 0.0005-0.015 mol.%. Copper powder and oil content stuck to the wire rod surface can be thus removed and the wettability of the BTA solution is improved. The copper wire rod after being cleaned is dipped in a treatment vessel storing the BTA solution as inhibitor. The BTA solution is provided by dissolving BTA in solvent such as water, alcohol, and trichloroethane. The copper wire rod treated by dipping is applied with the inhibitor by adjusting the adhesion quantity by an air wiper and dried so that a Cu-BTA protection film is formed on the wire rod surface.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for rustproofing a conductor for an outdoor distribution line which can be used for improving the corrosion resistance of an outdoor distribution line.

[0002]

2. Description of the Related Art In general, a conductor for an outdoor power distribution line is used without any coating and is used as a bare wire, and is subjected to a rust-proof treatment after being drawn to prevent rust. In this rust prevention treatment,
Benzotriazole or its derivatives are used as rust inhibitors for copper or copper alloys. In the following description, benzotriazole or a derivative thereof will be simply referred to as “BTA”.

[0003] The rust-preventive effect of BTA is due to the formation of a BTA polymer film on the surface of copper or a copper alloy material. That is, a thin copper oxide film of atomic order is always formed naturally on the surface of the copper or copper alloy material, but the BTA molecules form a strong coordination bond with this copper oxide and the BTA molecules also A covalent bond is formed to form a strong BTA polymer film on the surface of the copper or copper alloy material.
The BTA polymer film thus formed has excellent adhesion to copper or a copper alloy material, and also has extremely excellent corrosion resistance. Has the effect of protecting.

FIG. 3 is a block diagram showing a conventional method for rust-proofing a copper wire. As shown in FIG. 2, first, a rough drawn copper wire is continuously drawn until a desired wire diameter is obtained (Step S).
1) Thereafter, steam cleaning is performed to remove copper powder and oil attached to the surface of the copper wire (step S2). Then, this is immersed in a solution containing a rust inhibitor (step S).
3) After that, it is dried (step S4) and wound up (step S5).

FIG. 4 is a sectional view showing an immersion processing apparatus used in step S3. As shown in FIG. 4, an insertion port 6 a for the copper wire 7 and an outlet 6 b for the copper wire 7 are provided on both side walls of the processing container 6. Further, inside the processing container 6, two shafts 6c for guiding the copper wire 7 to pass through a predetermined passage are attached. An air wiper 8 for blowing air onto the surface of the copper wire 7 that has passed through the processing container 6 is provided at the tip of the outlet 6b.
Is installed. In the processing container 6, BTA is added to a solvent such as water or alcohol trichloroethane as a rust preventive.
Is dissolved in the BTA solution 9.

[0006] In the processing apparatus configured as described above, the copper wire 7 is driven so as to move in the processing vessel 6 by a sending-out or winding-up device (not shown) arranged on the upstream side or the downstream side. You. That is, the copper wire 7 is inserted from the insertion port 6a, and the BTA is
After being guided into the solution 9, it is pulled out from the outlet 6b. At this time, air is blown onto the surface of the copper wire 7 by the air wiper 8 to remove excess BTA solution remaining on the surface of the copper wire 7. Conventionally, rust prevention treatment has been performed by applying a BTA solution to the surface of the copper wire 7 in this way.

[0007]

However, the following problems occur when the rust prevention method according to the prior art is used. That is, a lubricant, copper powder, and the like are attached to the surface of the copper wire 7 immediately after being drawn, and even if the copper wire 7 is immersed in this state, the lubricant, the copper powder, and the like are not applied. As an obstacle, the wettability of the BTA solution to the copper wire surface is deteriorated. BTA molecules combine with thin copper oxide (Cu ₂ O) formed on the surface of the copper wire to form a Cu-BTA protective film (BTA polymer layer). In addition, a Cu-BTA protective film cannot be formed uniformly. On the other hand, in the prior art, as shown in the step S2, high-pressure steam is sprayed on the copper wire surface to perform steam cleaning. However, this steam cleaning alone cannot completely prevent discoloration of the wire. A more effective method was needed.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and can improve the wettability of a BTA solution on a copper wire surface after wire drawing and can uniformly form a BTA protective film. An object of the present invention is to provide a method for rust-proofing a conductor for outdoor distribution lines.

[0009]

The present invention has the following configuration to achieve the above object. The invention of claim 1 is
Between the step of drawing a wire made of a conductor material for outdoor distribution lines and the step of rust-proofing the wire, the drawn wire is put into a wire.
A method for rust-proofing a conductor for an outdoor power distribution line, comprising a step of washing with steam having a pressure of 5.0 to 1.0 (kgf / cm ² ) containing BTA of 0005 to 0.015 (mol%). It is. Note that copper or a copper alloy material can be used as the conductor material dedicated to power distribution. BTA is a generic term including benzotriazole or a derivative thereof.

According to the first aspect of the present invention, between the step of drawing the wire made of the conductor material for outdoor distribution lines and the step of rust-proofing the wire, the drawn wire is 0.0005-0. .
Pressure containing 015 (mol%) BTA 5.0-1.0
(Kgf / cm ² ) is included in the washing process, so that the BTA protective film can be formed at the same time as the copper powder or oil attached to the surface of the wire made of copper or copper alloy is removed by the steam. Therefore, the BTA of the wire surface after wire drawing
The wettability of the solution can be improved and the BTA protective film can be formed uniformly.

[0011] Here, 0.0005 to BTA is added to steam.
0.015 (mol%) is contained in 0.0005 (mo
1%), the rust prevention effect is not produced.
This is because BTA does not stably evaporate if it exceeds 15 (mol%). Further, when the vapor pressure is set to 1.0 (kgf / cm ² ) or more, the pressure becomes about atmospheric pressure at 1 (kgf / cm ² ), and the pressure becomes 5.0 (k).
gf / cm ² ) or less is to ensure the tightness of the steam exhaust system. According to the consideration of the inventor, the BTA concentration that can be dissolved in water vapor is as follows.
When the steam pressure is 1 (kgf / cm ² ), the BTA concentration is 0.014 (mol%) at the maximum, and the steam pressure is 5
(Kgf / cm ² ), the maximum BTA concentration is 0.002 (m
ol%). Here, it illustrates this relationship in equation the ratio of BTA soluble in water vapor as P _BTA, pressure Pw
Molar concentration M when BTA is dissolved in water vapor
(Mol%) is as follows. M = (P _BTA /Pw)×100=(0.0001356/Pw)×100

[0012]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 shows a main part of a process of a rust prevention treatment method according to an embodiment. As shown in FIG. 1, in this rust-prevention treatment method, first, a rough drawn copper wire is continuously drawn until a desired wire diameter is obtained (step S11), and thereafter, copper powder and oil adhering to the copper wire surface are removed. In order to remove them, steam cleaning is performed (step S12). Then, this is immersed in a rust preventive (step S13), and then dried (step S1).
4) Winding is performed on a winder (step S15). Along with the respective steps shown in FIG. 3, a wire made of copper or a copper alloy conductor material for outdoor power distribution lines is subjected to rust prevention treatment and a wire product is wound.

Here, in the embodiment, as shown in FIG.
Cleaning step (step S14) between the step of drawing (step S12) and the step of rust-proofing the wire (step S14)
13) In the case of the drawn wire rod of 0.0005 to
It contains 0.015 (mol%) BTA and has a pressure of 5.0.
This is completely different from the conventional one in that a step of performing cleaning by exposing to a water vapor atmosphere of about 1.0 (kgf / cm ² ) (also a rust prevention pretreatment step) is performed. In the rust prevention treatment step (step S14), a Cu-BTA protective film is formed on the surface of the wire by a method of dipping the wire in a BTA solution or a method of spraying high-pressure water containing BTA onto the wire.

In order to confirm the effect of the present invention, a wire rod according to the present invention (Example: N
o.12), a wire (Comparative Examples: No. 1 to No. 11) that was subjected to only a cleaning step using steam containing BTA under various conditions without performing a rust prevention treatment step, and steam containing no BTA. (Comparative Example: No. 13), a wire that has been subjected to rust-proof treatment without steam cleaning, and a wire that has not been subjected to rust-proof treatment (conventional examples: No. 14 and No. 15) )
Was immersed in a 100 ppm aqueous solution of Na ₂ S and pulled up after a lapse of a predetermined time (after 1 minute and 3 minutes), and the surface of the wire was visually inspected for discoloration.

In this case, if a film of BTA is not sufficiently formed on the surface of the wire, the copper oxide on the surface of the wire reacts with sodium sulfide to change its color. The result is shown in FIG. In the rust prevention process, the wire was immersed in a 1% BTA aqueous solution.

Referring to FIG. 2, the conventional example (No. 14 to No. 14)
In 15), in the case where the rust-proof treatment was not performed, the entire surface was discolored by immersion for 1 minute (No. 15), and in the case of the rust-proof treatment, the entire surface was discolored by immersion for 3 minutes (No. 14). No.1 ~
In the comparative example of No. 11, none of them was subjected to rust prevention treatment. However, in the case of steam cleaning containing BTA but having a low vapor pressure,
The entire surface was discolored by immersion for 1 minute (No. 1). And, in the steam cleaning without BTA even if the steam pressure is high,
The entire surface was discolored by immersion for 1 minute (No. 10).

Further, 0.0005 to 0.015 (mol
% BTA and a vapor pressure of 5.0 to 1.0 (kgf /
cm ² ) (Comparative Examples: No. ^{2 to} No. 9), all of which were slightly discolored by immersion for 1 minute, but were completely discolored by immersion for 3 minutes (No. 2). 6, No.8) so BT
It is understood that even if the A protective film is formed, it is thin. In other words, it is understood that a thin but not sufficient BTA protective film is formed on the wire by the steam cleaning including BTA.

In the case of a wire rod which has been subjected to steam cleaning containing no BTA and which has been subjected to rust-prevention treatment (Comparative Example: No. 13), slight discoloration is observed in either 1 minute or 3 minute immersion, but the entire surface is not discolored. Therefore, it is understood that the BTA protective film is generated to some extent. However,
In any of the above comparative examples, the color was slightly discolored when immersed in an aqueous solution of Na ₂ S for at least 1 minute.
It is understood that the formation of the A protective film is not sufficient.

On the other hand, the embodiment of the present invention (No. 1)
In (2), no discoloration was observed even after immersion for 3 minutes, and it can be understood that the BTA protective film was formed extremely well on the surface of the copper wire after drawing. From the above results, according to the present invention, not only the wettability of the BTA solution is improved by the steam cleaning,
It can be said that the BTA protective film can be uniformly formed over the whole in combination with the rust prevention treatment to be performed later.

Although the preferred embodiment of the present invention has been described in the above embodiment, it is needless to say that the present invention is not limited to this. In the rust prevention process, various methods such as dipping or spraying in a BTA aqueous solution can be used.

[0021]

As described above, according to the present invention, not only the wettability of the BTA solution is improved by the steam cleaning,
The BTA protective film can be formed uniformly in combination with the rust prevention treatment to be performed later. In addition, by including BTA in the steam in the cleaning step, the rust prevention treatment can be performed in substantially two stages in combination with the subsequent rust prevention treatment step. Therefore, it is not necessary to provide a new device in addition to the conventional device of each process, so that the rust prevention process can be performed twice without increasing the space, and the rust prevention can be appropriately and reliably performed on the wire material with good space efficiency. It can be processed.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of a method for rust-proofing a conductor for outdoor distribution lines according to an embodiment of the present invention.

FIG. 2 is a diagram illustrating the effect of the rust prevention treatment method of the present invention.

FIG. 3 is a general process chart of a rust prevention treatment method for a wire.

FIG. 4 is an explanatory view of a rust prevention treatment device.

[Explanation of symbols]

 S11 Wire drawing process S12 Steam cleaning process (also used as rust prevention pretreatment process) S13 Rust prevention process

Claims (1)

[Claims] 1. Between the step of drawing a wire made of a conductor material for outdoor distribution lines and the step of rust-proofing the wire, the drawn wire is added in an amount of 0.0005 to 0.015 (mol%). B
Anticorrosive treatment method of the conductor for outdoor distribution line, characterized in that it comprises a step of washing with water vapor pressure 5.0~1.0 (kgf / cm ²⁾ containing the TA.