KR20070068139A - Fabrication method of preventing porcelain insulator from salt water deposit - Google Patents

Abstract

A method of manufacturing a porcelain insulator is provided to prolong the lifespan of the porcelain insulator by increasing a surface tension of the porcelain insulator to prevent pollutants from conglomerating on the porcelain insulator. A chemical containing a methyl group of a concentration between 0.1M and 0.3M is mixed with PriOH at a room temperature. Nitride acid and water is added to the mixed result such that a sol for coating is obtained. The sol for coating is applied on a surface of a porcelain insulator. The porcelain insulator is dried. Heat is applied on the surface of the porcelain insulator. The chemical containing methyl group is selected from the group consisting of MTES(Methyl Tetra Ethyl Silane), TCMS(Tri Chloro Methyl Silane), and DMDES(Di Methyl Di Epoxy Silane).

Description

Fabrication method of preventing porcelain insulator from salt water deposit}

1 is a perspective view of a typical insulator.

2 is a partial cross-sectional view of the insulator not coated.

Figure 3 is a partial cross-sectional view of the insulator coating is formed by the method for producing a salt prevention insulator according to the present invention.

<Description of Symbols for Main Parts of Drawings>

10: Insulator 20: Water drop

30: pollutant 40: coating film

The present invention relates to a method for manufacturing insulator, and more particularly, to prevent the electrostatic and insulator breakage caused by salt accumulation on the insulator surface by maintaining water repellency for a long time by applying water repellent coating on the insulator surface. It is about a method.

In general, the insulator is a material such as magnetism or silica, which is used to insulate and mechanically maintain or support the spiral portion of a transmission line or an electric device as shown in FIG. 1. It is made.

As shown in FIG. 2, the insulator 10 for insulation, which is made of alumina silica-based raw materials currently used, reacts with water droplets 20 due to the properties of ceramics, thereby reducing the interfacial energy of the surface and easily changing to hydrophilicity. . As such, the surface of the insulator 10 is a material having a small surface energy, so the water droplets 20 are easily buried. On the other hand, since it is difficult to remove the water droplets 20, when the water droplets 20 including the pollutants 30 fall on the surface of the insulator 10, the water droplets 20 are dried on the surface of the insulator 10 and contaminants such as salts 30. ) Will remain on the surface.

When various kinds of contaminants 30 are buried on the surface of the insulator 10, the dielectric strength of the insulator 10 decreases, resulting in a power failure. In particular, the insulator 10 installed in a place where a large amount of salt and water in the air, such as the beach is buried in the surface of the water droplets 20, including contaminants 30, such as salt, and contaminants 30 Even after the water droplets 20 including) dries, the problem is serious because the pollutants 30 remain on the surface in many cases.

In order to solve this problem, insulators used in transmission, distribution lines, power plants, and substations located in areas with high salt damage should not be exposed to water droplets containing contaminants that cause blackouts or insulator damage. A water-repellent material is applied to the surface of the insulator to ensure that the water droplets are easily washed off by the wind.

Conventionally, as a method for applying a water-repellent material to the surface of the insulator, a manual method of applying silicone grease directly to the surface of the insulator has been used, which has a short lifespan in areas with high salt damage or very contaminated areas. There were inconveniences that had to be replaced almost every month, and inconvenience that had to be applied directly to the insulator surface manually, and at the same time, there was a problem that excessive labor costs were required for maintenance.

Another conventional method is STACLEAN, a commercially available product, designed to compensate for the inconvenience of the manual method of applying silicone grease directly to the insulator surface. The application thickness for insulation reinforcement function is 0.04mm, which is applied to the insulator surface. It can be painted and sprayed by spray gun, but since the coating material on the surface of the insulator is liquid, it is difficult to use for long periods of time because it is difficult to use for a long time in rainy weather. There was a problem, and accordingly, there was a problem that the expenses required for each work were excessive.

The present invention has been made in view of the above problems, by coating a material with a high surface energy on the surface of the insulator, it does not wash well in rain water, and to prevent the salt of the insulator to increase the insulation of the insulator by salt Its purpose is to provide.

In the present invention for achieving the above object, in the method for preparing the insulator, the concentration of the compound containing a methyl group in isopropyl alcohol (Pr ⁱ OH) at room temperature Mixing 0.1M to 0.3M, adding nitric acid and water to the mixture to prepare a coating sol, coating the coating sol on the surface of the insulator, and And drying the dried insulator.

The compound containing the methyl group is preferably any one of MTES, TCMS, DEDMS.

In the coating step, the pulling rate of the insulator with respect to the coating sol is preferably 1 cm / min to 29 cm / min.

In the preparing of the coating sol, the ratio of water per mole of the compound containing a methyl group is 2 to 4 mol, and the ratio of nitric acid is preferably 0.15 to 0.25.

The heat treatment step is preferably made at 300 ℃ to 500 ℃.

Hereinafter, the present invention will be described in detail.

Figure 3 is a partial cross-sectional view of the surface of the insulator coating layer formed by the salt prevention insulator production method of the present invention.

As a method for imparting water repellency so that the critical surface tension of the insulator 10 surface is low, as shown in FIG. 3, the surface tension of the insulator 10 surface is to produce the coating film 40.

The coating film 40 may be manufactured by various methods such as evaporation, sputtering, MOCVD, and solgel. Among them, the manufacturing of the coating film 40 by the sol-gel method can compensate for the disadvantages of substrate heating, specimen size limitation, expensive equipment, difficulty in controlling the composition, etc. that other methods have, and also manufacturing only the sol having appropriately controlled chemical reactions. The lower surface of the coating layer 40 can be easily manufactured by dipping, spinning, brushing, or the like.

The sol-gel method produces a sol having desired characteristics by causing hydrolysis and polycondensation reactions to occur in a solution prepared by dissolving a metal organic compound or an inorganic compound in an organic solvent, and gelling it in a form suitable for the purpose and heating it at a low temperature. To produce the final product.

The method for preparing the salt insulator for preventing salt of the present invention comprises preparing a sol for coating using the sol-gel method as described above, and then applying the coating sol to the surface of the insulator, and drying and heat-treating.

First, in order to prepare a coating sol, the concentration of the compound containing a methyl group in isopropyl alcohol (Pr ⁱ OH) at room temperature is mixed so that 0.1M to 0.3M.

Examples of the compound containing a methyl group include methyl tetra ethyl silane (MTES), tri chloro methyl silane (TCMS), and di methyl diethoxy silane (DMDES). Any compound containing a methyl group may be used.

On the other hand, when the concentration of the compound containing a methyl group is less than 0.1M, there is a problem in that the water repellent effect is weak or the coating is inhomogeneous , if it exceeds 0.3M, after coating the coating sol for cracking on the surface of the insulator This occurs and there is a problem of easy peeling.

Next, nitric acid and water are added to the mixture to prepare a coating sol.

The amount of water and nitric acid added to the mixture is preferably 2 mol to 4 mol of water per mole of the compound containing methyl group, and 0.15 mol to 0.25 mol of nitric acid, and takes time to react when the ratio of water is less than 2 mol. As a result, the coating is heterogeneous and its properties deteriorate. In addition, when the ratio of water is more than 4 molar ratio, the reaction is continued, the viscosity of the solution is increased and coating becomes impossible as time passes. The amount of nitric acid does not affect as much as the amount of water, but as the amount increases, the reaction rate increases, and the amount of water contained in the nitric acid is affected. The time until the solution is prepared is increased, and at the same time, unreacted material remains, resulting in a heterogeneous coating and deterioration of the properties.

Next, the coating sol is coated on the insulator surface.

Coating the coating sol on the surface of the insulator may be immersed in the coating sol and slowly taken out and wetted with the coating sol on the surface of the insulator and then rotated to insulate the insulator to remove excess liquid. Any method of coating the sol can be used.

On the other hand, in the step of coating the insulator surface, the pulling rate of the coating sol to the insulator is preferably 1 cm / min to 29 cm / min, and the lower the pulling rate, the better the coating film is coated. Even if the pulling speed is less than 1cm / min, there is no big problem, but it is preferable to set it to 1cm / min or more in consideration of the working speed.

On the other hand, when the pulling speed is more than 30cm / min, the coating film of the insulator becomes thick, there is a problem that the crack occurs after drying.

Next, after the coated insulator is dried at room temperature, the dried insulator is heat-treated.

Preferably, the heat treatment step is performed at 300 ° C. to 500 ° C., and when the heat treatment temperature is less than 300 ° C., the coating life becomes shorter. When the heat treatment temperature exceeds 500 ° C., the water repellency of the coating film on the surface of the insulator There is a problem that the characteristics for the decrease.

Hereinafter, the present invention will be described with reference to the following examples. However, these examples are only for illustrating the present invention, but the present invention is not limited thereto.

<Example>

compound Molarity (M) menstruum hydrolysis additive Pulling speed (cm / min) Heat treatment temperature (℃)  MTES  0.18M Pr ⁱ OH water nitric acid  15 cm / min  400 ℃ 3 mall 0.2 moles

After mixing isopropyl alcohol (Pr ⁱ OH) so that the concentration of MTES (Methyl tetra ethyl silane) is 0.18 M, 3 mol of water is added to 1 mol of MTES to hydrolyze MTES, and nitric acid as a hydrolysis catalyst. 0.2 mole was added to prepare a coating sol.

After coating the insulator with a pulling rate of 15 cm / min to the prepared sol for coating, it was dried at room temperature and heat-treated at 400 ℃.

As a result, a clean and excellent coating film was formed.

Comparative Example 1

compound Molarity (M) menstruum hydrolysis additive Pulling speed (cm / min) Heat treatment temperature (℃)  MTES  0.32M Pr ⁱ OH water nitric acid  15 cm / min  400 ℃ 3 mall 0.2 moles

After mixing isopropyl alcohol (Pr ⁱ OH) so that the concentration of MTES (Methyl tetra ethyl silane) is 0.32M, 3 mol of water is added to 1 mol of MTES to hydrolyze MTES, and nitric acid as a hydrolysis catalyst. 0.2 mole was added to prepare a coating sol.

After coating the insulator with a pulling rate of 15 cm / min to the prepared sol for coating, it was dried at room temperature and heat-treated at 400 ℃.

As a result, a slight crack occurred on the surface after drying.

Comparative Example 2

compound Molarity (M) menstruum hydrolysis additive Pulling speed (cm / min) Heat treatment temperature (℃)  MTES  0.18M Pr ⁱ OH water nitric acid  15 cm / min  400 ℃ 6 mall 0.2 moles

After mixing isopropyl alcohol (Pr ⁱ OH) so that the concentration of MTES (Methyl tetra ethyl silane) is 0.18M, 6 mol of water is added to 1 mol of MTES to hydrolyze MTES, and nitric acid as a hydrolysis catalyst. 0.2 mol was added to prepare a coating sol.

After coating the insulator with a pulling rate of 15 cm / min to the prepared sol for coating, it was dried at room temperature and heat-treated at 400 ℃.

As a result, coating is possible initially, but as the age passes, the viscosity of the sol increases, making coating impossible.

Comparative Example 3

compound Molarity (M) menstruum hydrolysis additive Pulling speed (cm / min) Heat treatment temperature (℃)  MTES  0.18M Pr ⁱ OH water nitric acid  30 cm / min  400 ℃ 3 mall 0.2 moles

After mixing isopropyl alcohol (Pr ⁱ OH) so that the concentration of MTES (Methyl tetra ethyl silane) is 0.18 M, 3 mol of water is added to 1 mol of MTES to hydrolyze MTES, and nitric acid as a hydrolysis catalyst. 0.2 mole was added to prepare a coating sol.

After coating the insulator with a pulling rate of the insulator to the prepared sol for 30cm / min, it was dried at room temperature and heat-treated at 400 ℃.

As a result, the coating became thick and cracked after drying.

Comparative Example 4

compound Molarity (M) menstruum hydrolysis additive Pulling speed (cm / min) Heat treatment temperature (℃)  MTES  0.18M Pr ⁱ OH water nitric acid  15 cm / min  500 ℃ 3 mall 0.2 moles

After mixing isopropyl alcohol (Pr ⁱ OH) so that the concentration of MTES (Methyl tetra ethyl silane) is 0.18 M, 3 mol of water is added to 1 mol of MTES to hydrolyze MTES, and nitric acid as a hydrolysis catalyst. 0.2 mole was added to prepare a coating sol.

After coating the insulator with a pulling rate of 15 cm / min to the prepared sol for coating, it was dried at room temperature and heat-treated at 510 ℃.

As a result, the water repellent property of the insulator surface was reduced.

According to the manufacturing method of the salt prevention insulator of the present invention as described above, it is possible to increase the surface tension of the insulator surface to prevent the accumulation of contaminants to prevent breakage due to electrical conduction to increase the life of the insulator.

Claims (5)

In the method of manufacturing the insulator, The concentration of the compound containing methyl group in isopropyl alcohol (Pr ⁱ OH) at room temperature Mixing to be 0.1M to 0.3M; Preparing a sol for coating by adding nitric acid and water to the mixture; Coating the coating sol on the surface of the insulator; Drying the coated insulator; and And heat-treating the dried insulators. The method of claim 1, The compound containing the methyl group is a method for producing a salt prevention insulator, characterized in that any one of MTES, TCMS or DMDES. The method of claim 1, The coating step is a method of manufacturing a salt prevention insulator, characterized in that the pulling rate of the insulator to the coating sol 1cm / min to 29cm / min. The method of claim 1, The manufacturing step of the coating sol is a method of producing a salt preventing insulator, characterized in that the ratio of water per 1 mole of the compound containing a methyl group 2 to 4 moles, the ratio of nitric acid is 0.15 to 0.25. The method of claim 1, The heat treatment step is a method for producing a salt prevention insulator, characterized in that made at 300 ℃ to 500 ℃.

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