CN1728291A

CN1728291A - Method for preparing insulator of anti pollution flashover in use for electric power equipment

Info

Publication number: CN1728291A
Application number: CN 200510012706
Authority: CN
Inventors: 冯巨祥; 杜心康; 王兰和; 闫军; 陈长杰; 柴书明; 任永斌
Original assignee: XINDAO DISTRIBUTION AUTOMATION Co Ltd SHIJIAZHUANG DEVELOPMENT ZONE
Current assignee: XINDAO DISTRIBUTION AUTOMATION Co Ltd SHIJIAZHUANG DEVELOPMENT ZONE
Priority date: 2005-07-29
Filing date: 2005-07-29
Publication date: 2006-02-01
Anticipated expiration: 2025-07-29
Also published as: CN100356486C

Abstract

The method includes steps: preparing mixed liquor from 7-10 portions acetylacetone, 15-18 absolute ethyl alcohol, 62-65 butyl ester titanate, and 8-11 water; adding hydrochloric acid to the mixed liquor to adjust pH value of the liquor to be as 0.5-2, and after the mixed liquor being mixed round for 0.5-1 hours, adding another water 8-11 portions to the said mixed liquor so as to produce sol; carrying out baking, and sintering procedures for prepared porcelain insulator with the said sol sprayed through stepping up, cladding or spray coating procedures; sintering temperature as 400-600 deg.C, heating rate as 10-25 deg.C/minute, holding time as 0.5-2.0 hours, and after sintering, cool off with stove. Features are: high capability of anti soil, improved surface condition of insulator so as to reduce accident of power failure caused by pollution flashover.

Description

Preparation method of anti-pollution flashover insulator for power equipment

Technical Field

The invention relates to a preparation method of an anti-pollution flashover insulator for power equipment.

Technical Field

The ceramic insulator has a long history of use, and all dielectric materials of the ceramic insulator have the characteristics required by power transmission and distribution equipment, and can meet the requirements of various levels of voltage no matter in mechanical load, electrical performance and thermal mechanical performance. However, the common porcelain insulator has two fatal weaknesses: firstly, under the dirty and humid condition, the insulator has the rapid reduction of the insulating property under the action of power frequency voltage, the local distribution is often uneven, and corona is often caused at the position where the electric field is concentrated, so that radio interference is generated. Uneven voltage distribution easily causes the porcelain body to age.

The reduction of the insulating ability of the surface of the insulator is mainly caused by the fact that a conductive dirt layer is formed on the surface of the insulator, the dirt is deposited on the surface of the insulator from the atmosphere, and whether the dirt can reside on the surface of the insulator depends on the adhesive force between the dirt and the surface of the insulator and the adhesive force between the dirt. The dirt or dust particles deposited from the atmosphere are often inorganic substances and have poor adhesive force, and the main reason for adhering the dirt or dust particles to the surface of the insulator is that the dirt or dust particles adhere to the surface of the porcelain insulator to form a dirt layer because the organic substances such as oil and the like in the atmosphere are adsorbed on the surface of the insulator or the surface of the dirt. When the insulator is exposed to rainy and foggy weather, a water film is possibly formed on the surface of the porcelain insulator, and if the filthy layer contains salt, a conductive film is formed on the surface of the porcelain insulator, so that pollution flashover discharge of the insulator is caused. At present, the main means for preventing pollution flashover is to clean the insulator manually, which wastes time and labor and has large maintenance cost investment.

Disclosure of Invention

The technical problem to be solved by the invention is to provide a porcelain insulator which has photocatalytic decomposition capability and can decompose organic matters attached to the surface of a porcelain insulator, so that the inorganic matters attached to the porcelain insulator can fall off easily under the action of wind power and rainwater, and the pollution flashover prevention capability of the porcelain insulator is improved.

The invention adopts the following technical scheme:

the invention adopts the following components in parts by weight: the preparation method comprises the steps of preparing a mixed solution of acetylacetone, absolute ethyl alcohol and butyl titanate according to the proportion of 7-10, absolute ethyl alcohol of 15-18, butyl titanate of 62-65 and water of 8-11, adding hydrochloric acid to adjust the pH value of the solution to be 0.5-2, stirring and mixing for 0.5-1 hour, then adding water of 8-11 to prepare sol, pulling, coating or spraying the sol on a fired porcelain insulator, drying, sintering in a sintering furnace at the sintering temperature of 400 DEG and 600 ℃, heating at the rate of 10-25 ℃/min, keeping the temperature for 0.5-2.0 hours, and cooling in the furnace after sintering.

The chemical formula of the butyl titanate (analytically pure) in the preparation process of the sol is C₁₆H₃₆O₄Ti, relative molecular weight 340.35, C₁₆H₃₆O₄Ti content is more than or equal to 98.0 percent, and the molecular formula of absolute ethyl alcohol (analytically pure) is CH₃CH₂OH, relative molecular weight 46.07, C₁₆H₃₆O₄Ti is more than or equal to 99.7 percent, and the molecular formula of acetylacetone (analytically pure) is C₅H₈O₂Relative molecular weight of 100.12, C₅H₈O₂The content is more than or equal to 99.0 percent, and the reaction formula is as follows:

starting a magnetic stirrer, placing a cleaned and dried container on a stirring table, pouring acetylacetone in parts by weight into the container, then pouring butyl titanate into the container, finally pouring absolute ethyl alcohol into the container, and recording the stirring starting time. Hydrochloric acid is added to adjust the pH value of the solution to 0.5-2.

And when the mixing and stirring time on the magnetic stirring table reaches 0.5-1 hour, adding water into the mixed solution, and continuously stirring until the solution is free of precipitate and becomes viscous.

The fired porcelain insulator is an insulator which is soaked in 10% HCL solution for 3-5 minutes and washed and dried by deionized water.

The invention has the following positive effects: by adopting the process, a layer of TiO is fired on the surface of the insulator after the insulator ceramic body is sintered₂The film is sintered again to obtain the finished product, so that the finished product has photocatalytic decomposition capability under the irradiation of ultraviolet rays, and organic matters attached to the surface of the porcelain body can be decomposed, so that the inorganic matters attached to the film can be more easily fallen off under the action of wind power and rainwater, and the requirement of improving the pollution flashover resistance of the porcelain insulator is met. TiO 2₂Under the irradiation of visible light, especially ultraviolet ray, the present invention has catalytic decomposition capacity and can decompose oil, phenol and other organic matter, and the present invention prepares TiO on the surface of ceramic insulator₂The film improves the anti-pollution capability of the porcelain insulator, improves the surface condition of the insulator and further reduces power failure accidents caused by pollution flashover. Furthermore, TiO₂Having semiconducting properties when coated with TiO₂The insulator with the components has the defects of heavy fog,When the hair rain, the surface of the insulator can have proper leakage current, and the drying process of the surface of the insulator can be accelerated by the heating action of the current, which is also beneficial to reducing the occurrence of pollution flashover accidents.

Because under the condition of no strong light irradiation, TiO is₂The film has a certain hydrophobic effect, so that the TiO film can be used in the wet weather conditions of rain, fog, snow, dew and the like₂The surface of the film is not easy to form a complete water film, and conductive ions of the filth dissolved by water are difficult to form a conductive channel, so that the voltage resistance is greatly improved.

Detailed Description

In the process of the invention, butyl titanate (analytically pure) has the formula C₁₆H₃₆O₄Ti, relative molecular weight 340.35, C₁₆H₃₆O₄Ti content is more than or equal to 98.0 percent, and is a product of chemical reagent factory in Tianjin; the molecular formula of absolute ethyl alcohol 9 (analytically pure) is CH₃CH₂OH, relative molecular weight46.07，C₁₆H₃₆O₄Ti is more than or equal to 99.7 percent and is a product of the permanent chemical reagent development center in Tianjin; acetylacetone (analytically pure) having the molecular formula C₅H₈O₂Relative molecular weight of 100.12, C₅H₈O₂The content is more than or equal to 99.0 percent, and is a product of chemical reagent factory in Tianjin.

In the sol preparation process, the chemical reaction formula is as follows:

example 1:

the invention adopts the following components in parts by weight: 10 parts of acetylacetone, 17 parts of absolute ethyl alcohol, 62 parts of butyl titanate and 11 parts of water, adding concentrated hydrochloric acid into a mixed solution prepared according to the proportion to adjust the pH value of the solution to be 0.5, stirring and mixing for 1 hour, then adding water 8 to prepare sol, soaking the fired porcelain insulator in a 10% HCL solution for 5 minutes, cleaning and drying the soaked porcelain insulator with deionized water, pulling, coating or spraying the sol, then drying, sintering in a sintering furnace at the sintering temperature of 600 ℃, at the heating rate of 18 ℃/min, at the heat preservation time of 0.5 hour, and cooling in the furnace after sintering.

Example 2:

the paint comprises the following components in parts by weight: the preparation method comprises the steps of preparing a mixed solution of acetylacetone, absolute ethyl alcohol and butyl titanate according to the proportion, adding concentrated hydrochloric acid to adjust the pH value of the solution to be 2, stirring and mixing for 0.5 hour, adding water 11 to prepare sol, soaking a fired porcelain insulator in a 10% HCL solution for 3 minutes, cleaning and drying the ceramic insulator with deionized water, pulling, coating or spraying the sol, drying, sintering in a sintering furnace at the sintering temperature of 400 ℃, at the heating rate of 10 ℃/minute, at the heat preservation time of 2.0 hours, and cooling in the furnace after sintering.

Example 3:

the paint comprises the following components in parts by weight: the preparation method comprises the steps of preparing a mixed solution of acetylacetone, absolute ethyl alcohol and butyl titanate according to the proportion of 8.5 percent, 18 percent of absolute ethyl alcohol, 63 percent of butyl titanate and 9 percent of water, adding concentrated hydrochloric acid to adjust the pH value of the solution to be 1.2, stirring and mixing for 0.7 hour, then adding the water 9 to prepare sol, soaking the fired porcelain insulator in a 10 percent HCL solution for 4 minutes, cleaning and drying the soaked porcelain insulator by deionized water, pulling, coating or spraying the sol, then drying the sol, placing the sol in a sintering furnace for sintering, wherein the sintering temperature is 500 ℃, the heating rate is 25 ℃/minute, the heat preservation time is 1.1 hour, and cooling the sintered porcelain insulator along with the furnace.

Example 4:

sol preparation process

Measuring 5 ml of butyl titanate according to the requirements of the weight parts of the components, and according to the determined proportion, the dosage of other medicines is as follows: 1.1 ml of acetylacetone, 10.5 ml of absolute ethyl alcohol and 1.08 ml of water.

Starting a magnetic stirrer, placing a cleaned and dried beaker on a stirring table, measuring 1.1 ml of acetylacetone by using a certain amount of cylinder, pouring into the beaker, measuring 5 ml of butyl titanate by using a measuring cylinder, pouring into the beaker, finally, measuring 10.5 ml of absolute ethyl alcohol, pouring into the beaker, and recording the stirring starting time. Hydrochloric acid was added to adjust the solution to pH 1.

When the mixing and stirring time on the magnetic stirring table reaches half hour, a dropper is used to measure 1.08 ml of water and slowly drops the water into the mixed solution, the solution is continuously stirred, and the solution can be used when the solution is not precipitated and becomes viscous. The process produces a sufficient amount of sol.

Film coating process

Soaking the electromagnetic bottle in 10% HCl solution for 3-5 min, cleaning with deionized water, oven drying, pulling the electromagnetic bottle from the glue solution at a constant speed of 1cm/s by pulling method, oven drying at 50-100 deg.C, and repeating the above pulling and oven drying process for 1-4 times.

Sintering

Sintering at 500 deg.c in a sintering furnace at temperature raising rate of 15 deg.c/min for 2 hr, and cooling in the furnace.

Claims

1. A preparation method of an anti-pollution flashover insulator for power equipment is characterized by comprising the following components in parts by weight: the preparation method comprises the steps of preparing a mixed solution of acetylacetone, absolute ethyl alcohol and butyl titanate according to the proportion of 7-10, absolute ethyl alcohol of 15-18, butyl titanate of 62-65 and water of 8-11, adding hydrochloric acid to adjust the pH value of the solution to be 0.5-2, stirring and mixing for 0.5-1 hour, then adding water of 8-11 to prepare sol, pulling, coating or spraying the sol on a fired porcelain insulator, drying, sintering in a sintering furnace at the sintering temperature of 400 DEG and 600 ℃, heating at the rate of 10-25 ℃/min, keeping the temperature for 0.5-2.0 hours, and cooling in the furnace after sintering.

2. The method according to claim 1, wherein said butyl titanate (analytically pure) has a chemical formula of C₁₆H₃₆O₄Ti, relative molecular weight 340.35, C₁₆H₃₆O₄Ti content is more than or equal to 98.0 percent, and the molecular formula of absolute ethyl alcohol (analytically pure) is CH₃CH₂OH, relative molecular weight 46.07, C₁₆H₃₆O₄Ti is more than or equal to 99.7 percent, and the molecular formula of acetylacetone (analytically pure) is C₅H₈O₂Relative molecular weight of 100.12, C₅H₈O₂The content is more than or equal to 99.0 percent, and the reaction formula is as follows:

3. the method according to claim 1 or 2, wherein the magnetic stirrer is started, the cleaned and dried container is placed on a stirring table, the acetylacetone is poured into the container, the butyl titanate is poured into the container, the absolute ethyl alcohol is poured into the container, and the stirring start time is recorded. Adding hydrochloric acid to adjust pH to 0.5-2, adding water into the mixed solution when the mixing time on the magnetic stirring table reaches 0.5-1 hr, and stirring continuously until the solution is not precipitated and becomes viscous.

4. The method as claimed in claim 1 or 2, wherein the ceramic insulator is prepared by soaking in 10% HCl solution for 3-5 min, and washing with deionized water.

5. The method as claimed in claim 3, wherein the ceramic insulator is prepared by soaking in 10% HCl solution for 3-5 min, and washing with deionized water.

6. The method for preparing an anti-pollution flashover insulator for electrical equipment according to claim 1 or 2, characterized in that the electromagnetic bottle is pulled out from the glue solution at a constant speed of 1cm/s by a pulling method, and is dried in an oven at 50-100 ℃, and the pulling and drying process can be repeated for 1-4 times.

7. The method according to claim 3, wherein the pulling method is used to pull the electromagnetic bottle from the glue solution at a constant speed of 1cm/s, and the electromagnetic bottle is dried in an oven at 50-100 ℃, wherein the pulling and drying process can be repeated for 1-4 times.

8. The method according to claim 4, wherein the pullingmethod is used to pull the electromagnetic bottle from the glue solution at a constant speed of 1cm/s, and the electromagnetic bottle is dried in an oven at 50-100 ℃, wherein the pulling and drying process can be repeated for 1-4 times.

9. The method according to claim 5, wherein the pulling method is used to pull the electromagnetic bottle from the glue solution at a constant speed of 1cm/s, and the electromagnetic bottle is dried in an oven at 50-100 ℃, wherein the pulling and drying process can be repeated for 1-4 times.