JPS6353270B2 - - Google Patents

Description

[Detailed description of the invention]

<Industrial Application Field> The present invention relates to a rust inhibitor mixture, and more specifically,
The present invention relates to a water-soluble rust preventive mixture for overhead distribution lines used to prevent stress corrosion and disconnection of overhead distribution lines. <Prior art> Insulation of overhead power distribution lines is progressing to ensure the safety of power distribution, but unlike bare wires, such overhead power distribution lines are exposed to a small amount of air in the atmosphere from their terminals, terminals, etc. There is a problem in that rainwater containing corrosive components enters the gap between the insulator and the conductor (hereinafter referred to as inside the insulator) and accumulates in the slack portion between the utility poles. This stagnant rainwater is concentrated by the heat cycle of the distribution line due to electricity, corroding the conductor surface and forming a stable black oxide film, and cracks etc. may occur in this oxide film due to various stresses. When several conditions overlap,
It is said that stress corrosion disconnection occurs starting at the crack portion. Although extremely rare, several methods have already been proposed to prevent stress corrosion disconnection that occurs in this way. One of them is the special application in 1982.
There is a method in No. 159305. In this method, a cylindrical body holding a rust preventive agent mixture is attached near the exposed conductor part of the overhead power distribution line, such as the tie-down part, and the rust preventive material is applied inside the insulator of the overhead power distribution line by flowing water such as rain. The purpose is to supply a chemical mixture and perform rust prevention treatment on copper conductors. The rust preventive mixture used is a mixture of a water-soluble copper rust preventive agent, methyl cellulose as a binder, and a nonionic surfactant such as polyoxyethylene alkyl ether. However, when methylcellulose is used as a binder for a rust preventive mixture, the rust preventive mixture dissolves in a short period of time due to rainfall, and the moisture evaporates slowly after rain, resulting in a rust preventive mixture. becomes a fluid,
There was a drawback that the rust preventive mixture could not be effectively supplied from the holder such as the cylinder into the inside of the insulator over a long period of time. On the other hand, when a surfactant is used as a binder for a rust preventive mixture, the viscosity changes drastically depending on the temperature, and in the summer, the viscosity decreases and flows out of the holder, causing a long-term build-up inside the insulator. There was a problem in that the rust preventive mixture could not be effectively supplied. <Purpose> The present invention has been made in view of the above-mentioned points, and is capable of effectively supplying a rust preventive mixture to the inside of an insulator of an overhead power distribution line over a long period of time. The purpose is to perform rust prevention treatment. <Structure> As a result of intensive research to achieve the above-mentioned object, the present inventors have determined that 20 to 70 parts by weight of sodium carboxymethylcellulose and 100 parts by weight of an addition salt of benzotriazole and a water-soluble amine The sodium carboxymethyl cellulose is made by mixing 30 to 80 parts by weight of water, and the carboxymethylcellulose sodium is mixed with 7 to 50 parts by weight of water.
% by weight is sodium carboxymethyl cellulose with an average degree of polymerization of 100 to 150, and the balance is sodium carboxymethyl cellulose with an average degree of polymerization of 100 to 150.
The present invention was completed by discovering a rust preventive mixture for overhead power distribution lines, which is sodium carboxymethyl cellulose having a molecular weight of 1,600 to 1,800. The addition salt of benzotriazole and water-soluble amine used in the present invention is obtained by heating and reacting benzotriazole and water-soluble amine at a low temperature of 50 to 80°C. T・228 is given. Examples of water-soluble amines include monoethanolamine, diethanolamine, triethanolamine, cyclohexylamine, and isopropylamine. As the carboxymethyl yalulose sodium used in the present invention, for example, Celogen manufactured by Daiichi Kogyo Seiyaku Co., Ltd. can be mentioned. The amount of carboxymethylcellulose sodium mixed is 100% of the addition salt of benzotriazole and water-soluble amine.
20 to 70 parts by weight, preferably
It is 30 to 60 parts by weight. When the amount of carboxymethyl cellulose sodium mixed is less than 20 parts by weight, the kneading processability of the mixture is poor, and when it exceeds 70 parts by weight, the rust preventive mixture is difficult to dissolve and is easily washed away by running water such as rain. Therefore, a sufficient amount of the rust inhibitor mixture is not supplied to the inside of the insulator. Carboxymethyl cellulose sodium as a water-soluble binder used in the present invention has an average polymerization degree of
It is composed of sodium carboxymethylcellulose with a polymerization degree of 100 to 150 and sodium carboxymethylcellulose with an average degree of polymerization of 1600 to 1800.The composition ratio is that sodium carboxymethylcellulose with an average degree of polymerization of 100 to 150 is 7 to 50% by weight of the total sodium carboxymethylcellulose. It is preferably 15 to 40% by weight. Carboxymethylcellulose sodium with an average degree of polymerization of 1600 to 1800 acts as a main binder,
Sodium carboxymethyl cellulose with an average degree of polymerization of 100-150 acts as an auxiliary binder. When the amount of sodium carboxymethyl cellulose with an average degree of polymerization of 100 to 150 is less than 7% by weight, the kneading processability is poor and it cannot be made into a mixture;
If it exceeds 50% by weight, it will be dissolved in a short time by running water such as rain, and a sufficient amount of the rust preventive mixture cannot be effectively supplied inside the insulator. The water used in the present invention is tap water, distilled water, etc., and the mixing amount is 30 to 80 parts by weight per 100 parts by weight of the addition salt of benzotriazole and water-soluble amine.
Parts by weight, preferably 35 to 70 parts by weight. When the amount of water mixed is less than 30 parts by weight, the kneading process is poor and it is difficult to create a mixture.On the other hand, when it exceeds 80 parts by weight, the mixture will shrink greatly during drying and will not be processed after processing. For example, it becomes difficult to fill adhesive sheets or cylindrical objects. <Effects> As described above, the rust preventive mixture for overhead distribution lines of the present invention uses running water such as rain to effectively prevent copper conductors of overhead distribution lines, which are objects to be rust-prevented, over a long period of time. It provides an excellent rust prevention effect by supplying a rust agent mixture. <Examples> Hereinafter, the present invention will be explained in more detail with reference to Examples, Comparative Examples, and Conventional Examples, but these Examples are not intended to limit the present invention in any way. While continuously stirring with a stirrer, add and dissolve the addition salt of benzotriazole and water-soluble amine in water, then slowly add sodium carboxymethyl cellulose, and after adding the entire amount, stir and knead for 20 minutes. A rust preventive mixture was obtained. The obtained rust preventive mixture 1 was formed into a 4 mm thick sheet and placed in a cylinder 2 as shown in FIG. 1 to form a sample 3. This sample 3 was attached to an insulated wire 4 with the insulation partially stripped as shown in Figure 2, and water was sprinkled from above at a rate of 40 mm/
Watering was carried out with a cycle of watering for 3 hours and stopping for 3 hours at min, and the amount of the rust preventive mixture eluted and the concentration of the rust preventive agent penetrating from the insulation stripped portion 5 of the insulated wire 4 in each cycle were measured. The rust inhibitor concentration was measured using an ultraviolet spectrophotometer. In addition,
In FIG. 2, 6 is a water sprinkler, 7 is a plastic cover, 8 is a hose, 9 is a collection bottle, and 10 is a drain hole.

【table】

[Table] ○: Good kneading processability ×: Unable to knead From the results in Table 1, the rust preventive mixture for overhead distribution lines of the present invention effectively supplies the rust preventive mixture to the inside of the insulator over a long period of time. I know that. With the rust preventive mixtures shown in the comparative examples or conventional examples, the kneading process is difficult and the rust preventive agent dissolves in a short period of time, which cannot be expected of the superiority of the rust preventive mixture for overhead distribution lines of the present invention. It is not possible to obtain the desired effect.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a cylinder containing a rust preventive mixture according to an embodiment of the present invention in an open state, and FIG. 2 is a schematic diagram of a water spray test. 1... Rust preventive mixture, 2... Cylindrical body, 3... Sample, 4...
Insulated wire, 5... Insulator stripped part (conductor).

Claims (1)

[Claims] 1. A rust preventive mixture for preventing rust on copper conductors of overhead distribution lines, the mixture comprising an addition salt of benzotriazole and a water-soluble amine.
100 parts by weight, 20 to 70 parts by weight of sodium carboxymethyl cellulose and 30 to 80 parts by weight of water are mixed, and the carboxymethyl cellulose sodium contains 7 to 50 weight% of carboxymethyl cellulose sodium with an average degree of polymerization of 100 to 150. A rust preventive mixture for overhead power distribution lines, characterized in that the mixture is sodium methylcellulose and the remainder is sodium carboxymethylcellulose having an average degree of polymerization of 1,600 to 1,800.