Measurement method for migration of hydrophobicity of surface of polyolefin insulator
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A technology for insulators and polyolefins, applied in surface tension analysis, surface/boundary effects, measuring devices, etc., can solve problems such as non-uniform spreading, long drying time, cumbersome operation, etc., achieve shortened drying time requirements, short preparation time, Simple operation effect
Active Publication Date: 2019-11-08
NANJING UNIV +1
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[0004] Practical applications have found that the existing hydrophobicity migration test technology has certain limitations, such as: (1) Not wide applicability: this technology is feasible for testing the hydrophobicity migration of porcelain, glass and silicone rubber insulator materials, and is applicable to polyolefin insulators During the water-based migration test, it was found that the water and sewage liquid formed droplets on the surface of the polyolefin, which could not spread evenly and form a uniform and continuous pollution layer,
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Embodiment 1
[0018] Testing the Hydrophobic Migration Properties of Polyolefin Insulators
[0019] The sample pretreatment: prepare a polyolefin sample with a size of 120mm×50mm×6mm, clean the surface of the sample with absolute ethanol, rinse it with deionized water, put it in a dustproof container after drying, and store it in a laboratory environment 24h, weighing, accurate to 0.0001g.
[0020] Sewage liquid preparation: use sodium chloride as the salt component, diatomaceous earth as the ash component, analytical pure ethanol and methanol as the dispersant. Among them, the diatomaceous earth is selected to be 500 mesh; the sodium chloride crystal is pulverized for 2 minutes at 25,000 rpm with a high-speed pulverizer. Set the ratio of salt density and ash density to 1:10, quantitatively weigh sodium chloride and diatomaceous earth in proportion, add them to methanol and ethanol (weight ratio 1:1), and make the pollution weight content 15%. When the dirty liquid is used, it should be s...
Embodiment 2
[0026] The invention is used to test the hydrophobic migration performance of other insulators, taking the silicone rubber insulator as an example.
[0027] Sample pretreatment: Prepare a silicone rubber sample with a size of 120mm×50mm×6mm, clean the surface of the sample with absolute ethanol, rinse it with deionized water, dry it and place it in a dustproof container, and store it in the laboratory environment for 24 hours. Weigh, accurate to 0.0001g.
[0028] Sewage liquid preparation: use sodium chloride as the salt component, diatomaceous earth as the ash component, and analytical pure ethanol as the dispersant. Among them, the diatomaceous earth is selected as 800 mesh; the sodium chloride crystal is pulverized for 2 minutes at 27000 rpm with a high-speed pulverizer. Set the ratio of salt density and gray density to 1:5, quantitatively weigh sodium chloride and diatomaceous earth according to the proportion, add them to ethanol, and make a dirty liquid with a dirty wei...
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Abstract
The invention provides a measurement method for migration of hydrophobicity of the surface of a polyolefin insulator. The method comprises the following steps of sample pretreatment, contamination solution preparation, sample contamination, contamination degree check and characterization of migration of hydrophobicity. A certain area of the surface of a polyolefin insulator sample is cleaned withabsolute ethyl alcohol, and then flushed with deionized water; powdered sodium chloride serves as a salt component for preparation of the contamination solution, powdered diatomite or kaolin serve asan ash component, and ethyl alcohol or methyl alcohol or propyl alcohol or a mixture thereof serves as a dispersing agent; the contamination solution directly contaminates the surface of the sample through brush application by a clean banister brush or with a spraying method; by comparing the weight difference of the sample before and after contamination, the contamination weight per unit area iscalculated to check the contamination grade; 96 hours after migration, a static water contact angle of the sample is measured, and a spray method is used for determining the hydrophobicity level. Themeasurement method is also applicable to the measurement of migration of hydrophobicity of various insulators such as porcelain, glass, silicone rubber and epoxy, and has the advantages of simple steps, simplified operation, short drying time of contaminated samples and the like.
Description
technical field [0001] The invention relates to a method for measuring hydrophobic migration on the surface of polyolefin insulators, belonging to the field of insulator material detection. Background technique [0002] Hydrophobic migration refers to the phenomenon that the hydrophobicity of the surface of the insulator penetrates the dirt layer attached to the umbrella cover, making the surface of the dirt layer hydrophobic. In heavily polluted areas, the problem of pollution flashover of insulators has always been a major threat to the safe operation of power systems, and the hydrophobic migration characteristics can make insulators have better anti-pollution flashover performance. In addition, as the running time increases, the gradual aging of the insulator and the continuous deposition of pollution will reduce or even lose the hydrophobicity of the insulator surface, resulting in a decrease in its pollution resistance. Therefore, hydrophobic migration, as a key parame...
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