JPS58121507A - Insulated wire for distributing trolley - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the improvement of an insulated magnetic wire for overhead power distribution, and its objectives are to prevent stress corrosion cracking of the insulated wire and increase its service life. .

Conventional insulated wires for overhead power distribution have a structure in which a separator such as a polyester tube is provided on a conductor made of a solid copper wire or a stranded wire, and the separator is covered with a rubber or plastic insulator. It has a structure in which an insulator is coated on top of the wire, and both have a structure in which there is residual stress generated during wire drawing or stranding. When overhead insulated wires with such a structure are used in outdoor high-voltage and low-voltage power distribution passages, atmospheric moisture such as rainwater can collect in the areas where the insulation has been stripped off at the suspension and branching sections caused by the overhead wires. Water is transmitted through the gaps between conductors and insulators, separators, and between stranded wires (2).
5, the corrosive action of the oxygen concentration battery is applied to the conductor where residual stress exists, causing stress corrosion to the conductor and eventually causing the conductor to break due to stress corrosion cracking, which is extremely dangerous from a safety standpoint.

In order to prevent such stress corrosion cracking, conventional methods have been to stabilize the surface of the conductor against corrosion and to make the surface of the conductor metal insensitive to corrosion, which has become sensitive due to residual stress. In this method, benzotriazole was mainly used as a chelating agent.

However, benzotriazole is difficult to dissolve in water, and it is difficult to apply it uniformly on the conductor. In the case of preheating work by passing the electrode wheel through, the chelate film could be easily removed by being rubbed with a roll and lose its effectiveness.Moreover, in recent years, air pollution has increased in chemical industrial areas and around the 13 major cities. Furthermore, since rainwater contains various tactile substances, NH,
,07, So, 1 containing cations and anions such as
When M corrosive moisture enters, the effect of the chelate film on the conductor is lost, and the conductor is subjected to corrosive action, often resulting in stress corrosion cracking.

The present invention has been made in view of the above points, and provides lubricity to the chelate film, and provides NH↓, az-.

This improves the stabilization of the chelate film against corrosive aqueous solutions such as SO;-. That is, in an insulated wire for overhead power distribution in which a rubber or plastic insulation coating layer is provided around the outer periphery of a hard copper stranded wire conductor, a chelating agent and an amphoteric surfactant are blended on the conductor.

□” This is an insulated tome wire for overhead power distribution, which is characterized by having a wall coated with an aqueous solution.

Table 1 In the present invention, the chelating agent may be trifluorothenoylacetone, oxine, potassium acetylacetone 1 dithizone xanthate, etc., but it is best to use pencitriazole or methylbenzotriazole in terms of color fastness and heat resistance. preferable. As an amphoteric surfactant, it is preferable to use an alkyl amino acid that has a hydrophilic group that becomes a cation and a hydrophilic group that becomes an anion within the molecule □, and has molecular cross-linking as shown in the following formula.

For example, add 7 alkyl amino acids to benzotriazole:
When the water solution (4), which is easily mixed with water, is applied on a copper conductor, a chelate compound U reflection 1- consisting of benzotriazole is formed on the surface of the copper, and then an alkylamino acid is added to this Adsorbs onto the chelate compound film,
By reducing the interfacial tension against wetting with copper and melting of water,
One chelate is uniformly formed on the copper S curve, and it also becomes uniformly mixed with water from the outside, and the surface of the chelate layer is scattered in the field, giving lubricity to the chelate skin lI!Am. This prevents damage caused by rubbing from the outside, and also prevents rainwater from entering from the outside.
1, A that occurs on the donor surface of copper even if y and H are included.
Ion (NH; , Ou”), anion (ot-
, so 7), when they come in contact with an amphoteric surfactant of an alkyl amino acid, the amphoteric nr+ surfactant has a reactive group that becomes a granium ion and a IIz ion when dissolved in water (2). Copper, which is a conductor, no longer acts as a lithium-corrosive ion.Therefore, stress corrosion cracking resistance is significantly improved.

In other words, the present invention adds an amphoteric surfactant that has both a cation (two hydrophilic groups and an anionic hydrophilic group) in one molecule to benzotriazole, which has been conventionally used, and coats it on a conductor. It is characterized by the fact that it can be applied uniformly and has lubricity.It also prevents corrosive aqueous solutions containing 01, So, NH, etc. from penetrating into the insulating bore. If it is possible, the amphoteric surfactant preferentially dissolves in water, becomes cations and anions, and causes a neutralization reaction with ions in the corrosive aqueous solution, protecting the conductor copper or the chelate layer on the copper. It is.

Example cross-linked polyethylene insulated wire (OC6θ) 8.Conductor/9/
, 2.0φ), an aqueous solution containing a chelating agent and an amphoteric surfactant as shown in Example/9.2 of Table 1 was applied to the surface of a copper conductor. For comparison, we also made wires coated with only a chelating agent as shown in the comparative example in the table. Samples were taken from each of the wires made in this way, the insulator was removed, and the diameter of these samples was determined. On the other hand, about 7! Wrap these around the double diameter P■0 vibe, H, 1So4?
J'g/l + N H4゜H3! The sample was placed in a sealed atmosphere in a desiccator containing a mixed solution (PHW) of W/l, and a heat cycle of tθ0C:, 2θ0C was applied, and the time until stress corrosion cracking occurred in the sample was measured. The results are shown in Tatsu 1. According to Table 1, embodiments according to the invention/
An aqueous solution containing 02% benzotriazole and alkyl amino acid θ/% is applied to the body as shown in 25θθθ.
No cracking occurred even after the passage of time. In addition, the results were good in terms of licensing fees. However, in Comparative Example / where only Bensito 91zole was applied without adding an amphoteric surfactant, cracks occurred in 2500θ hours, and in Comparative Example λ where only methylbenzotriazole was applied, cracks occurred in 4000 hours. The effect of the addition of the amphoteric surfactant was clear.

As mentioned above, the insulated wire for overhead wiring made according to the present invention exhibits stress corrosion cracking resistance over a long period of time after being exposed to corrosive environments, so it is Oa.

It is applied to OF and O'W'4 lines and has a remarkable effect.

Claims (1)

[Claims] In an insulated wire for overhead power distribution in which a rubber or plastic insulation layer is provided on the outer periphery of a hard copper stranded conductor with or without a separator, an aqueous solution containing a chelating agent and an amphoteric surfactant is applied onto the conductor. An insulated wire for overhead power distribution, which is characterized by: