CN-116297282-B - Method for evaluating hydrophobic migration of anti-pollution flashover coating by in-situ infrared spectroscopy

Abstract

The invention provides a method for testing hydrophobicity and evaluating hydrophobicity migration of an anti-pollution flashover rubber insulating coating, which comprises the following steps of preparing the anti-pollution flashover coating, doping a small molecular indicator into the anti-pollution flashover coating, coating the anti-pollution flashover coating on a glass plate to obtain an anti-pollution flashover coating with the thickness of 0.3-0.5 mm, solidifying and drying the anti-pollution flashover coating to obtain the glass plate/anti-pollution flashover coating, preprocessing the pollution, sieving the pre-treated anti-pollution flashover coating, uniformly dispersing the sieving matters into deionized water or ethanol, spraying the anti-pollution flashover coating onto the surface of the anti-pollution flashover coating, fully drying the anti-pollution flashover coating to obtain the glass plate/anti-pollution flashover coating/pollution, depositing a metal film on the surface of the glass plate/anti-pollution flashover coating/pollution flashover coating as a reflecting layer of infrared incident light and a plasma reinforcing agent, and performing hydrophobicity test and hydrophobicity migration evaluation. The method is simple and quick, and is hopeful to be popularized and used.

Inventors

• Zhu Gengzeng
• WANG DIE
• GAO ZHIYUE
• ZHANG LIPENG
• WU YAPING
• ZONG LIJUN
• YAO SHUO
• LIU XIN
• ZHANG ZHENYUE
• WANG WEINA
• WANG QIAN
• DU BAOSHUAI
• TIAN HUI
• WANG XIAOMING
• LI WENJING
• FAN ZHIBIN
• MI CHUNXU
• JIANG BO
• YU FENGJIE
• YAN FENGJIE

Assignees

• 国网山东省电力公司电力科学研究院

Dates

Publication Date

20260505

Application Date

20221202

Claims (7)

1. 1. The method for testing the organic matters in the pollution of the anti-pollution flashover coating by using the in-situ infrared spectrum is characterized by comprising the following steps of: (1) Preparing an anti-pollution flashover coating, and doping a small molecular indicator into the anti-pollution flashover coating; (2) Coating the anti-pollution flashover coating on a glass plate to obtain an anti-pollution flashover coating with the thickness of 0.3-0.5 mm, and curing and drying to obtain the glass plate/the anti-pollution flashover coating; (3) Pretreating the pollution, sieving with a 200 sieve, uniformly dispersing undersize substances into deionized water or ethanol, spraying the undersize substances onto the surface of the anti-pollution flashover coating, and fully drying to obtain a glass plate/the anti-pollution flashover coating/the pollution; (4) Depositing a metal film on the dirt surface of the glass plate/the anti-pollution flashover coating/the dirt, and taking the metal film as a reflecting layer of infrared incident light and a plasma reinforcing agent to obtain the glass plate/the anti-pollution flashover coating/the dirt/the metal film; (5) Placing a glass plate/an anti-pollution flashover coating/a pollution/metal film into a sample chamber of an attenuated total reflection Fourier infrared spectrometer, wherein the metal film is tightly attached to the lower surface of an ATR-FTIR detector; (6) Setting the ambient temperature and humidity, aging the glass plate/the anti-pollution flashover coating/the pollution/the metal film for a certain time, and then adopting ATR-FTIR (atom transfer radical polymerization-FTIR) to test the pollution FTIR in the aging process of the anti-pollution flashover coating in situ; (7) The resulting FTIR was analyzed to identify the organic components that migrated into the soil.
2. 2. The method for testing organic matters in pollution of an anti-pollution flashover coating by in-situ infrared spectrum according to claim 1, wherein the anti-pollution flashover coating is an organosilicon coating or an organic fluorine coating.
3. 3. The method for testing organic matters in the pollution flashover coating according to claim 1, wherein the small molecule indicator is an indicator molecule compatible with the flashover coating and diffused on the surface of the flashover coating, the molecular weight is less than 10000g/moL, and the viscosity is less than 1000mpa.s.
4. 4. The method for testing organic matters in pollution flashover-preventing coating pollution by in-situ infrared spectroscopy according to claim 1, wherein the pollution refers to simulated pollution or electric power system insulator coating pollution, and the coating amount is 0-3 mg/cm 2 .
5. 5. The method for testing organic matters in pollution flashover-preventing coating pollution by in-situ infrared spectroscopy according to claim 1, wherein the simulated pollution is diatomite, sodium chloride or a mixture of the diatomite and the sodium chloride.
6. 6. The method for testing organic matters in pollution flashover-preventing coating pollution by in-situ infrared spectroscopy according to claim 1, wherein the metal film is a nano particle film of platinum, gold, silver and copper, and the thickness is 6-10 nm.
7. 7. The method for testing the hydrophobic migration of the anti-pollution flashover coating by using the in-situ infrared spectrum is characterized by comprising the following steps of: (1) Preparing an anti-pollution flashover coating, doping a small molecular indicator into the anti-pollution flashover coating, coating the anti-pollution flashover coating on a glass plate to obtain an anti-pollution flashover coating with the thickness of 0.3-0.5 mm, solidifying and drying to obtain the glass plate/anti-pollution flashover coating, pre-treating the pollution, sieving with a 200 sieve, uniformly dispersing the sieving matter into deionized water or ethanol, spraying the deionized water or ethanol onto the surface of the anti-pollution flashover coating, fully drying to obtain the glass plate/anti-pollution flashover coating/pollution, depositing a metal film on the surface of the glass plate/anti-pollution flashover coating/pollution, and preparing 6 completely identical glass plates/anti-pollution flashover coatings/pollution/metal films by cutting, wherein the serial numbers are #1, #2, #3, #4, #5 and #6; (2) FTIR of #1, #2, #3 glass plates/anti-fouling flashover coating/fouling/metal film was tested at 1h intervals, from which the integrated area corresponding to the first characteristic peak of the small molecule indicator was identified, and the three were averaged and recorded as To subtract the coating background The influence of (1) to = - 、 = I represents i h th; (3) Also, the contact angles of #4, #5, #6 glass plates/anti-pollution flashover coating/pollution/metal film were tested by using the GB/T19519-2014 method every 1h, and the contact angles were recorded as the average of the three I represents i h th; (4) Up to the N h th point of time, All tend to be stable, then N h is called the characteristic time of the hydrophobic migration of the anti-pollution flashover coating; (5) Summarizing a tabulation: Making a curve -i、 -I, calculating the slope of each of the 2 curves 、 I.e. hydrophobic migration rate, finding the respective inflection point 、 I.e. characteristic hydrophobic angle, defining: Hydrophobic migration rate correction coefficient: / ; characteristic hydrophobic angle correction coefficient: / ; (6) Fixing a small molecular indicator, and testing the influence of the thickness h of the coating on the hydrophobic mobility; changing the coating thickness h, repeating the steps (1) - (5), and measuring -I, obtaining 、 And correction value thereof 、 ; (7) Fixing a small molecular indicator, and testing the influence of the pollution density f on the hydrophobic mobility; changing the pollution density f, repeating the steps (1) - (5), and measuring -I, obtaining 、 And correction value thereof 、 。

Description

Method for evaluating hydrophobic migration of anti-pollution flashover coating by in-situ infrared spectroscopy Technical Field The invention belongs to the technical field of hydrophobic migration testing of an electric power external insulation coating, and particularly relates to a method for testing the hydrophobicity and evaluating the hydrophobic migration of an anti-pollution flashover rubber insulation coating. Background The electric power system is an infrastructure of the electric power industry and plays a significant role in protecting national economy development. Under complex and particularly dirty climatic conditions (fog, haze, rain, snow and the like), high-voltage power transmission and transformation equipment is extremely prone to flashover. It is known that thousands of pollution flashovers occur on a national grid each year, sometimes resulting in nearly provincial grids thus split. In order to ensure the stable operation of the power grid, an anti-pollution flashover coating is generally adopted to protect high-voltage power transmission and transformation equipment such as insulators, switches and the like. In the anti-pollution flashover coating, the Room Temperature Vulcanized (RTV) silicone rubber coating is widely popularized and applied in the power industry due to the characteristics of convenient construction, good hydrophobicity, high pollution flashover voltage and the like. In addition to hydrophobicity, another important measure of RTV silicone rubber coatings is the hydrophobic migration, i.e., in the case of surface fouling, the ability of the coating itself to migrate to the foulants. Only the coating with hydrophobic migration can safely work under actual working conditions, and the flashover phenomenon is prevented. In order to evaluate the hydrophobicity and hydrophobic migration of silicone rubber insulating coatings, the conventional method is (GB/T19519-2014) to apply a stain or simulate a stain on the surface of the coating, and then measure the contact angle-time curve of the stain-covering coating, or to conduct the hydrophobic apparent classification after spraying water multiple times through multiple samples (DL/T627-2018). These methods, although widely used, have large workload and low reproducibility of experimental results. At present, a method for evaluating the hydrophobic migration of the anti-pollution flashover coating by using a spectrometry is not reported yet. In other fields, the national invention patent CN 114252409A discloses a method for checking the gel time of powder coating, CN 104198432B discloses a method for identifying the brand of fire-retardant coating for steel structure, and CN 103604771A discloses a method for identifying the emulsion type of water-based wall coating. However, these methods do not involve hydrophobicity evaluation and are all ex situ. The infrared spectrum is a molecular spectrum which uses the characteristic vibration frequency of atoms and molecules to infrared rays (wave numbers of 800-4000 cm -1) to identify chemical bonds and functional groups of substances, and is suitable for identifying compounds, especially organic matters. The characteristic functional groups and the content of the functional groups forming the organic matters can be identified according to the characteristic infrared spectrum (fingerprint) of the organic matters and the signal intensity of the fingerprint. Therefore, it is theoretically possible to identify RTV silicone rubber coatings, organics migrating from the coating to the fouling surface, using infrared spectroscopy. It is believed that the hydrophobic migration of RTV silicone rubber coatings results from migration of small molecule organics from the interior of the coating to the surface of the foul, imparting hydrophobicity to the foul. For infrared spectroscopic identification of these molecules, it has been applied in related studies (IEEE trans. Dielect. Elec. Instrumentation 2017 24:1057,IEEE Trans.Power Delivery 2003 18:506). However, the evaluation of the hydrophobicity and the hydrophobic migration of the anti-fouling flashover coating by the molecular spectrum of the molecules is not reported at present. Disclosure of Invention The invention discloses a simple and quick method for evaluating hydrophobicity and hydrophobic migration of a coating by in-situ tracking infrared spectrum signals of organic molecules in pollution of an anti-pollution flashover coating. In order to achieve the technical purpose, the invention is realized by the following technical scheme: A method for testing organic matters in pollution of an anti-pollution flashover coating by in-situ infrared spectrum, which comprises the following steps: (1) Preparing an anti-pollution flashover coating, and doping a small molecular indicator into the anti-pollution flashover coating; (2) Coating the anti-pollution flashover coating on a glass plate to obtain an anti-pollution flashover coating with th