CN115746504A - Salt-fog-resistant and leakage-mark-resistant epoxy formula material for electric appliance insulator and preparation method thereof - Google Patents
Salt-fog-resistant and leakage-mark-resistant epoxy formula material for electric appliance insulator and preparation method thereof Download PDFInfo
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- CN115746504A CN115746504A CN202211504503.3A CN202211504503A CN115746504A CN 115746504 A CN115746504 A CN 115746504A CN 202211504503 A CN202211504503 A CN 202211504503A CN 115746504 A CN115746504 A CN 115746504A
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Abstract
The invention discloses a salt-fog-resistant and electric-leakage-trace-resistant epoxy formula material for an electric appliance insulating part and a preparation method thereof, wherein the salt-fog-resistant and electric-leakage-trace-resistant epoxy formula material for the electric appliance insulating part comprises the following components in parts by weight: 100 parts of epoxy resin; 80-85 parts of a curing agent; 420-550 parts of 400-mesh silicon micropowder; nano Al 2 O 3 1-3 parts; 2-7 parts of a toughening agent. The electrical appliance insulating part prepared by the formula material can resist salt mist and leakage marks.
Description
Technical Field
The invention relates to the field of insulating materials, in particular to a salt mist-resistant and leakage trace-resistant epoxy formula material for an electric appliance insulating part and a preparation method thereof.
Background
The epoxy insulating part produced by the epoxy formula material has good mechanical property and excellent electrical property, and can be widely applied to the fields of electric power systems, rail transit, new energy and the like. In practical use, however, the aging of epoxy formulation materials is inevitably caused by factors such as temperature, humidity, electricity, light, salt spray and the like. Particularly, in mountainous areas and coastal areas where natural environments are severe, the proportion of failures caused by aging of insulating materials is higher and higher.
Electrical aging is an inevitable aging form of epoxy resins, and electrical scratch damage on the surface of materials due to discharge aging is regarded by researchers. The electric mark aging is mainly carried out on an insulating material working outdoors or in a harsh environment, and the insulating material is subjected to the comprehensive action of pollutants such as salt mist, moisture, dust and the like, so that the surface of the material is in a wet state, the leakage current on the surface of the material is increased due to the increase of the electric conductivity, a large amount of heat is generated, and the moisture in a dirty belt is evaporated. But the heat distribution on the surface of the material is uneven, the evaporation rate of water is different, and uneven drying belts are generated on the surface of the material. When the electric field intensity on the drying belt exceeds the air breakdown field intensity, discharge arc discharge occurs on the surface of the material, and a large amount of heat and ultraviolet rays are generated. Under the combined action of various conditions such as high temperature, ultraviolet, oxygen and the like, the molecular chain of the epoxy resin is broken and decomposed, the mechanical property of the material is reduced, the surface of the material is subjected to electric etching, and finally a carbonization path is formed, so that the material is damaged in an insulating way.
Disclosure of Invention
The invention aims to solve the problem that the insulation of an epoxy formula material in coastal areas is damaged due to easy salt aging and electric aging.
In order to achieve the aim, the invention provides a salt mist-resistant and leakage trace-resistant epoxy formula material for an electric appliance insulating part, which comprises the following components in parts by weight:
alternatively, the epoxy resin includes a bisphenol a type epoxy resin and an alicyclic type epoxy resin.
Optionally, the epoxy resin comprises 60 to 80 parts by weight of bisphenol a epoxy resin.
Optionally, the epoxy resin comprises 20 to 40 parts by weight of an alicyclic epoxy resin.
Alternatively, the curing agent comprises liquid modified methyl tetrahydrophthalic anhydride and liquid modified methyl hexahydrophthalic anhydride.
Optionally, in the curing agent, the weight part of the liquid modified methyl tetrahydrophthalic anhydride is 50-70 parts.
Optionally, in the curing agent, the weight part of the liquid modified methylhexahydrophthalic anhydride is 15-30 parts.
Optionally, the nano Al 2 O 3 Hydrophobic surface treated nanoparticles are selected.
Optionally, the toughening agent is PPG-400.
The invention also provides a method for preparing the electric appliance insulating part by using the salt spray resistant and tracking resistant epoxy formula material for the electric appliance insulating part, which comprises the following steps:
step one, nano Al is added 2 O 3 Stirring the nano particles and a small amount of epoxy resin in a high-speed dispersion instrument for 30 minutes at the rotating speed of 1000 revolutions per minute;
step two, adding the mixture obtained in the step one, the rest of epoxy resin, curing agent, 400-mesh silicon micro powder and toughening agent into a vacuum mixing tank, wherein the vacuum degree is 0-0.1Mpa, the stirring speed is 30-100r/min, and the mixture is stirred and vacuumized for 2-3 hours;
and step three, pumping the material obtained in the step two into an APG mould with the temperature of 140-150 ℃ under the pressure of 0.1-0.4mPa, curing for 10-20 minutes, and demoulding to obtain the salt mist-resistant and leakage trace-resistant electric appliance insulating part.
The invention has the beneficial effects that:
(1) The invention utilizes the bond energy of C-H bond in the molecular structure of alicyclic epoxy resin and the structure that the main chain and the side chain do not contain benzene ring and the like to ensure that the polymer insulating material only forms CO even if the thermal decomposition occurs 2 And the like, without forming a large amount of conductive graphite carbon or a semiconductive organic matter residue, and thus the tracking resistance of the material can be improved.
(2) Selecting nano Al with hydrophobic surface treatment 2 O 3 The particles can form nano-scale crystal grains or non-crystal substances in the polymer to form nano-scale micropores or bubbles, have extremely high surface activity, greatly enhance the interaction force between the particles and resin, improve the thermal conductivity of the material and reduce the water absorption, thereby improving the hydrophobicity and the tracking resistance of the formula material.
(3) Due to the fact that the molecular chain of the alicyclic epoxy resin is relatively short, the brittleness of the formula material is too high, and the brittleness of the formula can be improved through the addition of the toughening agent.
Detailed Description
The technical solutions of the present invention are described clearly and completely below, and it is obvious that the described embodiments are some, not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Table 1 shows the epoxy formulation materials for the salt spray resistant and tracking resistant electrical appliance insulator and the comparative examples provided by the invention.
Table 1: epoxy formula material formulation table (unit: portion) for electric insulation part
| Formulation of | Example 1 | Example 2 | Example 3 | Comparative example |
| Bisphenol A epoxy resin | 80 | 70 | 60 | 100 |
| Alicyclic epoxy resin | 20 | 30 | 40 | / |
| Liquid modified methyl tetrahydrophthalic anhydride | 70 | 60 | 50 | 80 |
| Liquid modified methyl hexahydrophthalic anhydride | 15 | 25 | 30 | / |
| 400 mesh silicon micropowder | 420 | 480 | 520 | 320 |
| Nano Al 2 O 3 | 1 | 3 | 2 | / |
| Toughening agent | 2 | 5 | 7 | / |
Wherein, the nano Al 2 O 3 Selecting nano particles with hydrophobic surface treatment, wherein the toughening agent is PPG-400.
The salt spray resistant and tracking resistant electrical insulation member was prepared according to the epoxy formulation provided in examples 1-3. The method comprises the following specific steps:
step one, nano Al is added 2 O 3 Stirring the nano particles and a proper amount of epoxy resin in a high-speed dispersion instrument for 30 minutes at the rotating speed of 1000 revolutions per minute;
secondly, adding the mixture obtained in the first step, the rest of epoxy resin, liquid modified methyl tetrahydrophthalic anhydride, liquid modified methyl hexahydrophthalic anhydride, 400-mesh silicon micro powder and a toughening agent into a vacuum mixing tank, wherein the vacuum degree is 0-0.1Mpa, the stirring speed is 30-100r/min, and the mixture is stirred and vacuumized for 2-3 hours;
and step three, pumping the material obtained in the step two into an APG mould with the temperature of 140-150 ℃ under the pressure of 0.1-0.4mPa, curing for 10-20 minutes, and demoulding to obtain the salt mist-resistant and leakage trace-resistant electric appliance insulating part.
A conventional epoxy insulator was prepared with the material formulation provided in the comparative example, including:
step one, adding bisphenol A type epoxy resin, liquid modified methyl tetrahydrophthalic anhydride and silicon micro powder filler into a vacuum mixing tank, wherein the vacuum degree is 0-0.1Mpa, the stirring speed is 30-100r/min, and the vacuum pumping is carried out for 2-3 hours while stirring;
and step two, the formula material obtained in the step one is placed into an APG mould with the temperature of 140-150 ℃ under the pressure of 0.1-0.4mPa, cured for 10-20 minutes, and demoulded to obtain the conventional epoxy insulation sample strip.
The insulation made according to the formulations provided in examples 1-3 and comparative examples were tested and the results are as follows.
Table 2: performance test data sheet
| Performance of | Example 1 | Example 2 | Example 3 | Comparative example |
| Viscosity (Mpas) | 58000 | 65000 | 69000 | 43000 |
| Stretching (kJ/m) 2 ) | 71 | 79 | 78 | 73 |
| Bend (Mpa) | 120 | 125 | 123 | 122 |
| Notched impact (Mpa) | 1.6 | 2.0 | 2.1 | 1.9 |
| Breakdown field strength (kV/mm) | 24 | 28 | 31 | 24 |
| Glass transition temperature (. Degree. C.) | 110 | 105 | 90 | 106 |
| Crack resistance | -20℃ | -60℃ | -60℃ | -20℃ |
| Surface contact angle | 106.56 | 107.76 | 108.36 | 98.15 |
| Resistance to tracking after salt spray test | 1A2.5 | 1A2.5 | 1A2.5 | 1A0 |
In the above table, 1a2.5 is the result of the test according to GB/T6553-2014 "test method for evaluating tracking resistance and corrosion resistance of an electrically insulating material used under severe environmental conditions", and 1a2.5 indicates that five samples tested have no damage after being subjected to resistance for 6 hours at 2.5 kV; 1A0 represents five samples tested, at least one sample being resistant to 6 hours at 2.5 kV. Salt fog is a common pollution form, the essence of the electric trace resistance is to improve the dirt resistance of the material, the test solvent of the salt fog test is salt and a surfactant, after the salt fog test, the electric trace leakage resistance of the material is improved, and the salt fog resistance of the material is also enhanced.
From the above-mentioned test results, the comparative examples were inferior in surface contact angle and tracking resistance to examples 1 to 3 of the present invention.
While the present invention has been described in detail with reference to the preferred embodiments, it should be understood that the above description should not be taken as limiting the invention. Various modifications and alterations to this invention will become apparent to those skilled in the art upon reading the foregoing description. Accordingly, the scope of the invention should be limited only by the attached claims.
Claims (10)
1. The salt mist-resistant and leakage trace-resistant epoxy formula material for the electric appliance insulating part is characterized by comprising the following components in parts by weight:
2. the salt spray resistant tracking-resistant epoxy formulation for electrical insulators of claim 1, wherein the epoxy resin comprises bisphenol a type epoxy resin and alicyclic type epoxy resin.
3. The salt spray resistant and tracking resistant epoxy formulation for electrical insulators of claim 2, wherein the epoxy resin comprises bisphenol a epoxy resin in an amount of 60-80 parts by weight.
4. The salt spray resistant tracking-resistant epoxy formulation for electrical insulators of claim 2, wherein the epoxy resin comprises 20-40 parts by weight of a cycloaliphatic epoxy resin.
5. The salt-fog-resistant tracking-resistant epoxy formulation for electrical insulators of claim 1, wherein the curing agent comprises liquid modified methyl tetrahydrophthalic anhydride and liquid modified methyl hexahydrophthalic anhydride.
6. The salt spray resistant and tracking resistant epoxy formulation for electrical insulators of claim 5, wherein the curing agent comprises 50-70 parts by weight of liquid modified methyl tetrahydrophthalic anhydride.
7. The salt spray resistant and tracking resistant epoxy formulation for electrical insulators of claim 5, wherein the curing agent comprises 15-30 parts by weight of liquid modified methylhexahydrophthalic anhydride.
8. The salt spray resistant tracking-resistant epoxy formulation for electrical insulators of claim 1, wherein the nano-Al is selected from the group consisting of 2 O 3 Hydrophobic surface treated nanoparticles are selected.
9. The salt-fog-resistant tracking-resistant epoxy formulation for electrical insulators of claim 1, wherein the toughening agent is PPG-400.
10. A method of making an electrical insulation from the epoxy formulation for salt spray and tracking resistant electrical insulation of any of claims 1-9, comprising:
step one, nano Al is added 2 O 3 Stirring the nano particles and a small amount of epoxy resin in a high-speed dispersion instrument for 30 minutes at the rotating speed of 1000 revolutions per minute;
step two, adding the mixture obtained in the step one, the rest of epoxy resin, curing agent, 400-mesh silicon micro powder and toughening agent into a vacuum mixing tank, wherein the vacuum degree is 0-0.1Mpa, the stirring speed is 30-100r/min, and the mixture is stirred and vacuumized for 2-3 hours;
and step three, pumping the material obtained in the step two into an APG mould with the temperature of 140-150 ℃ under the pressure of 0.1-0.4mPa, curing for 10-20 minutes, and demoulding to obtain the salt mist-resistant and leakage trace-resistant electric appliance insulating part.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211504503.3A CN115746504A (en) | 2022-11-28 | 2022-11-28 | Salt-fog-resistant and leakage-mark-resistant epoxy formula material for electric appliance insulator and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211504503.3A CN115746504A (en) | 2022-11-28 | 2022-11-28 | Salt-fog-resistant and leakage-mark-resistant epoxy formula material for electric appliance insulator and preparation method thereof |
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| CN115746504A true CN115746504A (en) | 2023-03-07 |
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| CN202211504503.3A Pending CN115746504A (en) | 2022-11-28 | 2022-11-28 | Salt-fog-resistant and leakage-mark-resistant epoxy formula material for electric appliance insulator and preparation method thereof |
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