CN118325463A - Insulating coating for high voltage electrical equipment and preparation method thereof - Google Patents

Abstract

The invention relates to the technical field of insulating materials, and discloses an insulating coating for high-voltage electrical equipment. The insulating coating comprises the following components by weight percentage: 1%-10% of carbon nanotubes, 5%-20% of siloxane, 2%-15% of fluoropolymer, 10%-25% of silicone resin, 2%-12% of nano-ceramic particles, 1%-5% of nano-cellulose, 15%-35% of solvent, 3%-10% of talcum powder, 7%-25% of diluent, 1%-8% of additive and 2%-12% of curing agent. The invention also discloses a method for preparing the insulating coating for high-voltage electrical equipment, and the method comprises the following steps: pre-treating the carbon nanotubes, siloxane, fluoropolymer, silicone resin, nano-ceramic particles, nano-cellulose, solvent, talcum powder, diluent, additive and curing agent respectively. By combining materials such as carbon nanotubes, siloxanes, fluoropolymers, silicone resins, nano-ceramic particles, and nano-cellulose, the dielectric constant of the coating can be significantly increased, the loss tangent can be reduced, and the electrical breakdown strength can be increased, thereby improving the electrical properties of the coating.

Description

Insulating coating for high voltage electrical equipment and preparation method thereof

Technical Field

The invention relates to the technical field of insulating materials, in particular to an insulating coating for high-voltage electrical equipment and a preparation method thereof.

Background technique

In the power system, the insulation protection of high-voltage electrical equipment is crucial. As a commonly used insulation protection material, the performance of insulating coating directly affects the safety and reliability of high-voltage electrical equipment. Therefore, developing an insulating coating for high-voltage electrical equipment with excellent electrical properties, thermal stability, physical properties and environmental stability is an important technical issue in the field of power systems.

In the current existing technology, the insulating coating of high-voltage electrical equipment is usually composed of one or more resins (such as epoxy resin, polyester resin, polyurethane resin, etc.), fillers (such as quartz powder, aluminum silicate powder, etc.), curing agents, diluents and various additives (such as pigments, defoamers, leveling agents, etc.). These coatings are usually prepared by mixing, stirring, grinding, filtering and other steps.

Although these coatings can meet the insulation protection requirements of high-voltage electrical equipment to a certain extent, they still have some problems. For example, the electrical performance parameters of existing insulating coatings such as dielectric constant, loss tangent and electrical breakdown strength often cannot meet the use requirements of high-voltage electrical equipment, which can easily lead to electrical damage and affect the safety and reliability of the equipment. In addition, they are prone to thermal decomposition in high temperature environments, which reduces the electrical and physical properties of the coatings and cannot provide long-lasting insulation protection.

Summary of the invention

In view of the deficiencies in the prior art, the present invention provides an insulating coating for high-voltage electrical equipment and a preparation method thereof, which solves the problem that the electrical performance parameters of the existing insulating coatings, such as the dielectric constant, loss tangent and electrical breakdown strength, often cannot meet the use requirements of high-voltage electrical equipment, and are prone to thermal decomposition in a high-temperature environment, resulting in a decrease in the electrical and physical properties of the coating.

To achieve the above purpose, the present invention is implemented through the following technical scheme: an insulating coating for high-voltage electrical equipment, comprising the following components by weight percentage: 1%-10% of nano-carbon tubes, 5%-20% of siloxane, 2%-15% of fluoropolymer, 10%-25% of silicone resin, 2%-12% of nano-ceramic particles, 1%-5% of nano-cellulose, 15%-35% of solvent, 3%-10% of talc, 7%-25% of diluent, 1%-8% of additives and 2%-12% of curing agent.

Preferably, the additives include 0.5%-5% of an anti-ultraviolet agent, 0.5%-3% of an antioxidant and 1%-8% of a fire retardant.

Preferably, the curing agent is one or more of polyetheramine, formaldehyde and diisocyanate.

Preferably, the diameter of the carbon nanotubes is 1-100 nanometers, and the particle size of the nano-ceramic particles is 1-100 nanometers.

A method for preparing an insulating coating for high-voltage electrical equipment comprises the following steps:

Pre-treating carbon nanotubes, siloxane, fluoropolymer, silicone resin, nano-ceramic particles, nano-cellulose, solvent, talc, diluent, additive and curing agent respectively;

Mix and stir all the pretreated materials in a high-speed stirrer at a certain stirring speed for a period of time to obtain a mixed solution;

The mixed liquid is subjected to ultrasonic treatment within a certain ultrasonic frequency range for a period of time to obtain a coating premix;

The coating premix is subjected to high temperature curing treatment, the curing temperature is 80°C-150°C, and the curing time is 2-4 hours to obtain the insulating coating.

Preferably, the stirring speed is 500-2000 rpm, and the stirring time is 1-3 hours.

Preferably, the ultrasonic frequency is 20-40 kHz, and the ultrasonic time is 30-60 minutes.

Preferably, the specific steps of the pretreatment are:

The carbon nanotubes are immersed in a mixed solution of sulfuric acid and nitric acid in a volume ratio of 2:1 to 4:1 for 10-14 hours, then washed with deionized water at room temperature until the pH value is 7, and finally dried at 50-70°C for 20-28 hours;

Dry the siloxane in an oven at 100-140°C for 3-5 hours to remove moisture and impurities;

Dry the fluoropolymer in an oven at 70-90°C for 5-7h to remove moisture;

Dry the silicone resin in an oven at 130-170°C for 1-3 hours to remove moisture;

The nano-ceramic particles are immersed in a mixed solution of sulfuric acid and nitric acid in a volume ratio of 2:1 to 4:1 for 10-14 hours, then washed with deionized water at room temperature until the pH value is 7, and finally dried at 50-70°C for 20-28 hours;

The nanocellulose was soaked in a 0.5-1.5% sulfuric acid solution for 1-3 h, then washed with deionized water at room temperature until pH = 7, and finally dried at 50-70 ° C for 20-28 h;

The solvent is distilled through a fractionating tower, and the portion with a boiling point of 105-120°C is collected;

Dry the talc in an oven at 130-170°C for 1-3 hours to remove moisture and impurities;

The diluent is distilled through a fractionating tower and fractions with corresponding boiling points are collected;

The additive was washed with deionized water at room temperature and then dried at 50-70°C for 20-28h;

The curing agent was washed with deionized water at room temperature and then dried at 50-70°C for 20-28h.

Preferably, the ultrasonic treatment step is carried out in an ice water bath, and the solidification treatment step is carried out in a vacuum oven.

The present invention provides an insulating coating for high-voltage electrical equipment and a preparation method thereof. The coating has the following beneficial effects:

1. The present invention can significantly improve the dielectric constant of the coating, reduce the loss tangent, and increase the electrical breakdown strength, thereby improving the electrical properties of the coating by combining materials such as nano-carbon tubes, siloxane, fluoropolymer, silicone resin, nano-ceramic particles, and nano-cellulose.

2. The present invention can improve the thermal stability of the coating by adding materials with good thermal stability such as silfluorocarbons, fluoropolymers, and silicone resins to the coating, so that the coating can maintain good electrical and physical properties in a high temperature environment.

3. The present invention can improve the film thickness, adhesion and wear resistance of the coating by adding materials with good mechanical properties such as nano-carbon tubes, nano-ceramic particles, and nano-cellulose to the coating, thereby improving the physical properties of the coating.

4. The present invention can improve the environmental stability of the coating by adding ultraviolet agents, antioxidants and fire retardants to the coating, so that it can maintain good performance in harsh environments such as ultraviolet radiation, oxidative environments and fires.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a flow chart of the present invention.

Detailed ways

The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

Please refer to Figure 1. An embodiment of the present invention provides an insulating coating for high-voltage electrical equipment and a preparation method thereof, which includes the following components by weight: 1%-10% of nano-carbon tubes, 5%-20% of siloxane, 2%-15% of fluoropolymer, 10%-25% of silicone resin, 2%-12% of nano-ceramic particles, 1%-5% of nano-cellulose, 15%-35% of solvent, 3%-10% of talc, 7%-25% of diluent, 1%-8% of additives and 2%-12% of curing agent.

The additives include 0.5%-5% of an anti-ultraviolet agent, 0.5%-3% of an antioxidant and 1%-8% of a fire retardant.

The curing agent is optionally one or more of polyetheramine, formaldehyde, and diisocyanate.

The diameter of the nano carbon tube is 1-100 nanometers, and the particle size of the nano ceramic particle is 1-100 nanometers.

A method for preparing an insulating coating for high-voltage electrical equipment comprises the following steps:

Pre-treating carbon nanotubes, siloxane, fluoropolymer, silicone resin, nano-ceramic particles, nano-cellulose, solvent, talc, diluent, additive and curing agent respectively;

Mix and stir all the pretreated materials in a high-speed stirrer at a certain stirring speed for a period of time to obtain a mixed solution;

The mixed liquid is subjected to ultrasonic treatment within a certain ultrasonic frequency range for a period of time to obtain a coating premix;

The coating premix is subjected to high temperature curing treatment, the curing temperature is 80° C.-150° C., and the curing time is 2-4 hours to obtain an insulating coating.

The stirring speed is 500-2000 rpm, and the stirring time is 1-3 hours.

The ultrasonic frequency is 20-40 kHz, and the ultrasonic time is 30-60 minutes.

The specific steps of the pretreatment are:

The carbon nanotubes are immersed in a mixed solution of sulfuric acid and nitric acid in a volume ratio of 2:1 to 4:1 for 10-14 hours, then washed with deionized water at room temperature until the pH value is 7, and finally dried at 50-70°C for 20-28 hours;

Dry the siloxane in an oven at 100-140°C for 3-5 hours to remove moisture and impurities;

Dry the fluoropolymer in an oven at 70-90°C for 5-7h to remove moisture;

Dry the silicone resin in an oven at 130-170°C for 1-3 hours to remove moisture;

The nano-ceramic particles are immersed in a mixed solution of sulfuric acid and nitric acid in a volume ratio of 2:1 to 4:1 for 10-14 hours, then washed with deionized water at room temperature until the pH value is 7, and finally dried at 50-70°C for 20-28 hours;

The nanocellulose was soaked in a 0.5-1.5% sulfuric acid solution for 1-3 h, then washed with deionized water at room temperature until pH = 7, and finally dried at 50-70 ° C for 20-28 h;

The solvent is distilled through a fractionating tower, and the portion with a boiling point of 105-120°C is collected;

Dry the talc in an oven at 130-170°C for 1-3 hours to remove moisture and impurities;

The diluent is distilled through a fractionating tower and fractions with corresponding boiling points are collected;

The additive was washed with deionized water at room temperature and then dried at 50-70°C for 20-28h;

The curing agent was washed with deionized water at room temperature and then dried at 50-70°C for 20-28h.

The ultrasonic treatment step is carried out in an ice water bath, and the solidification treatment step is carried out in a vacuum oven.

Embodiment 1:

Step 1: 5% carbon nanotubes were immersed in a mixed solution of sulfuric acid and nitric acid in a volume ratio of 3:1 for 12 hours, then washed with deionized water at room temperature until pH = 7, and finally dried at 60° C. for 24 hours.

Step 2: Dry the 15% siloxane in an oven at 120°C for 4 hours to remove moisture and impurities.

Step 3: Dry the 10% fluoropolymer in an oven at 80°C for 6 hours to remove moisture.

Step 4: Dry the 20% silicone resin in an oven at 150°C for 2 hours to remove moisture.

Step 5: Soak 5% of the nano-ceramic particles in a mixed solution of sulfuric acid and nitric acid in a volume ratio of 3:1 for 12 hours, then wash with deionized water at room temperature until pH = 7, and finally dry at 60° C. for 24 hours.

Step 6: 2% nanocellulose was soaked in 1% sulfuric acid solution for 2 hours, then washed with deionized water at room temperature to pH = 7, and finally dried at 60°C for 24 hours.

Step 7: Distill 25% of the solvent (eg toluene) through a fractionating tower, and collect the fraction with a boiling point of 110-115°C.

Step 8: Dry the 5% talc in an oven at 150°C for 2 hours to remove moisture and impurities.

Step 9: Distill 15% of a diluent (such as a ketone, alcohol, ester or ether solvent) through a fractionating tower, and collect the fractions with corresponding boiling points.

Step 10: 3% of additives (such as UV inhibitors, antioxidants and fire retardants) were washed with deionized water at room temperature and then dried at 60°C for 24 hours.

Step 11: 5% of the curing agent (eg, polyetheramine, formaldehyde, diisocyanate) was washed with deionized water at room temperature and then dried at 60°C for 24 hours.

Step 12: Mix and stir all the pretreated materials in a high-speed stirrer at a stirring speed of 1000 rpm for 2 hours to obtain a mixed solution.

Step 13: The mixed solution is subjected to ultrasonic treatment at a frequency of 30 kHz and a time of 45 minutes to obtain a coating premix.

Step 14: subjecting the coating premix to high-temperature curing treatment, with the curing temperature being 120° C. and the curing time being 3 hours, to obtain an insulating coating.

Summary of Example 1: Through the above steps, we successfully prepared an insulating coating for high-voltage electrical equipment. The coating has excellent electrical properties, such as high dielectric constant, low loss tangent and high electrical breakdown strength, and has good thermal stability, and can be used for insulation protection of high-voltage electrical equipment.

Embodiment 2:

Step 1: 2% carbon nanotubes were immersed in a mixed solution of sulfuric acid and nitric acid in a volume ratio of 4:1 for 10 hours, then washed with deionized water at room temperature until pH = 7, and finally dried at 50° C. for 20 hours.

Step 2: Dry the 10% siloxane in an oven at 100°C for 3 hours to remove moisture and impurities.

Step 3: Dry the 5% fluoropolymer in an oven at 70°C for 5 hours to remove moisture.

Step 4: Dry the 15% silicone resin in an oven at 130°C for 1 hour to remove moisture.

Step 5: Soak 3% of the nano-ceramic particles in a mixed solution of sulfuric acid and nitric acid in a volume ratio of 4:1 for 10 hours, then wash with deionized water at room temperature until pH = 7, and finally dry at 50° C. for 20 hours.

Step 6: 1% nanocellulose was soaked in 0.5% sulfuric acid solution for 1 hour, then washed with deionized water at room temperature to pH = 7, and finally dried at 50°C for 20 hours.

Step 7: Distill 35% of the solvent (eg, toluene) through a fractionating tower, and collect the fraction with a boiling point of 105°C.

Step 8: Dry the 3% talc in an oven at 130°C for 1 hour to remove moisture and impurities.

Step 9: Distill 7% of a diluent (such as a ketone, alcohol, ester or ether solvent) through a fractionating tower, and collect the fractions with corresponding boiling points.

Step 10: 1% of additives (such as UV inhibitors, antioxidants and fire retardants) were washed with deionized water at room temperature and then dried at 50°C for 20 hours.

Step 11: 2% of the curing agent (eg, polyetheramine, formaldehyde, diisocyanate) was washed with deionized water at room temperature and then dried at 50°C for 20 hours.

Step 12: Mix and stir all the pretreated materials in a high-speed stirrer at a stirring speed of 500 rpm for 1 hour to obtain a mixed solution.

Step 13: The mixed solution is subjected to ultrasonic treatment at a frequency of 20 kHz and a time of 30 minutes to obtain a coating premix.

Step 14: subjecting the coating premix to high-temperature curing treatment, with the curing temperature being 80° C. and the curing time being 2 hours, to obtain an insulating coating.

Summary of Example 2: Through the above steps, we successfully prepared an insulating coating for high-voltage electrical equipment. The coating has excellent electrical properties, such as high dielectric constant, low loss tangent and high electrical breakdown strength, and has good thermal stability, and can be used for insulation protection of high-voltage electrical equipment.

Embodiment 3:

Step 1: 10% of the carbon nanotubes were soaked in a mixed solution of sulfuric acid and nitric acid in a volume ratio of 2:1 for 14 hours, then washed with deionized water at room temperature until the pH value was 7, and finally dried at 70° C. for 28 hours.

Step 2: Dry the 20% siloxane in an oven at 140°C for 5 hours to remove moisture and impurities.

Step 3: Dry the 15% fluoropolymer in an oven at 90°C for 7 hours to remove moisture.

Step 4: Dry the 25% silicone resin in an oven at 170°C for 3 hours to remove moisture.

Step 5: Soak 12% of the nano-ceramic particles in a mixed solution of sulfuric acid and nitric acid in a volume ratio of 2:1 for 14 hours, then wash with deionized water at room temperature until pH = 7, and finally dry at 70° C. for 28 hours.

Step 6: 5% nanocellulose was soaked in 1.5% sulfuric acid solution for 3 hours, then washed with deionized water at room temperature until pH = 7, and finally dried at 70°C for 28 hours.

Step 7: Distill 15% of the solvent (eg, toluene) through a fractionating tower, and collect the fraction with a boiling point of 120°C.

Step 8: Dry the 10% talc powder in an oven at 170°C for 3 hours to remove moisture and impurities.

Step 9: Distill 25% of the diluent (such as ketone, alcohol, ester or ether solvent) through a fractionating tower, and collect the fractions with corresponding boiling points.

Step 10: 8% of additives (such as UV inhibitors, antioxidants and fire retardants) were washed with deionized water at room temperature and then dried at 70°C for 28 hours.

Step 11: 12% of a curing agent (eg, polyetheramine, formaldehyde, diisocyanate) was washed with deionized water at room temperature and then dried at 70°C for 28 hours.

Step 12: Mix and stir all the pretreated materials in a high-speed stirrer at a stirring speed of 2000 rpm for 3 hours to obtain a mixed solution.

Step 13: The mixed solution is subjected to ultrasonic treatment at a frequency of 40 kHz and a time of 60 minutes to obtain a coating premix.

Step 14: subjecting the coating premix to high-temperature curing treatment, with the curing temperature being 150° C. and the curing time being 4 hours, to obtain an insulating coating.

Summary of Example 3: Through the above steps, we successfully prepared an insulating coating for high-voltage electrical equipment. The coating has excellent electrical properties, such as high dielectric constant, low loss tangent and high electrical breakdown strength, and has good thermal stability, and can be used for insulation protection of high-voltage electrical equipment.

Embodiment 4:

Step 1: 7% carbon nanotubes were immersed in a mixed solution of sulfuric acid and nitric acid in a volume ratio of 3:1 for 13 hours, then washed with deionized water at room temperature until pH = 7, and finally dried at 60° C. for 24 hours.

Step 2: Dry the 18% siloxane in an oven at 130°C for 4 hours to remove moisture and impurities.

Step 3: Dry the 12% fluoropolymer in an oven at 85°C for 6 hours to remove moisture.

Step 4: Dry the 22% silicone resin in an oven at 150°C for 2 hours to remove moisture.

Step 5: Soak 8% of the nano-ceramic particles in a mixed solution of sulfuric acid and nitric acid in a volume ratio of 3:1 for 12 hours, then wash with deionized water at room temperature until pH = 7, and finally dry at 60° C. for 24 hours.

Step 6: 3% nanocellulose was soaked in 1% sulfuric acid solution for 2 hours, then washed with deionized water at room temperature until pH = 7, and finally dried at 60°C for 24 hours.

Step 7: Distill 20% of the solvent (eg, toluene) through a fractionating tower and collect the fraction with a boiling point of 110°C.

Step 8: Dry the 7% talc in an oven at 150°C for 2 hours to remove moisture and impurities.

Step 9: Distill 10% of the diluent (such as ketone, alcohol, ester or ether solvent) through a fractionating tower, and collect the fractions with corresponding boiling points.

Step 10: 5% of additives (such as UV inhibitors, antioxidants and fire retardants) were washed with deionized water at room temperature and then dried at 60°C for 24 hours.

Step 11: 8% of the curing agent (eg, polyetheramine, formaldehyde, diisocyanate) was washed with deionized water at room temperature and then dried at 60°C for 24 hours.

Step 12: Mix and stir all the pretreated materials in a high-speed stirrer at a stirring speed of 1500 rpm for 2.5 hours to obtain a mixed solution.

Step 13: The mixed solution was subjected to ultrasonic treatment at a frequency of 35 kHz and a time of 50 minutes to obtain a coating premix.

Step 14: subjecting the coating premix to high-temperature curing treatment, with the curing temperature being 130° C. and the curing time being 3.5 hours, to obtain an insulating coating.

Summary of Example 4: This example successfully prepared an insulating coating for high-voltage electrical equipment. The coating has excellent electrical properties, such as high dielectric constant, low loss tangent and high electrical breakdown strength, and good thermal stability, and can be used for insulation protection of high-voltage electrical equipment.

Embodiment 5:

Step 1: 8% carbon nanotubes were soaked in a mixed solution of sulfuric acid and nitric acid in a volume ratio of 2.5:1 for 11 hours, then washed with deionized water at room temperature until pH = 7, and finally dried at 55° C. for 22 hours.

Step 2: Dry the 12% siloxane in an oven at 110°C for 3.5 hours to remove moisture and impurities.

Step 3: Dry the 8% fluoropolymer in an oven at 75°C for 6 hours to remove moisture.

Step 4: Dry the 18% silicone resin in an oven at 140°C for 1.5 hours to remove moisture.

Step 5: Soak 6% of the nano-ceramic particles in a mixed solution of sulfuric acid and nitric acid in a volume ratio of 2.5:1 for 11 hours, then wash with deionized water at room temperature until pH = 7, and finally dry at 55° C. for 22 hours.

Step 6: 4% nanocellulose was soaked in 1% sulfuric acid solution for 2 hours, then washed with deionized water at room temperature until pH = 7, and finally dried at 55°C for 22 hours.

Step 7: Distill 30% of the solvent (eg, toluene) through a fractionating tower, and collect the fraction with a boiling point of 110°C.

Step 8: Dry the 8% talc in an oven at 140°C for 2 hours to remove moisture and impurities.

Step 9: Distill 20% of the diluent (such as ketone, alcohol, ester or ether solvent) through a fractionating tower, and collect the fractions with corresponding boiling points.

Step 10: 6% of additives (such as UV inhibitors, antioxidants and fire retardants) were washed with deionized water at room temperature and then dried at 55°C for 22 hours.

Step 11: 10% of the curing agent (eg, polyetheramine, formaldehyde, diisocyanate) was washed with deionized water at room temperature and then dried at 55°C for 22 hours.

Step 12: Mix and stir all the pretreated materials in a high-speed stirrer at a stirring speed of 1200 rpm for 2 hours to obtain a mixed solution.

Step 13: The mixed solution is subjected to ultrasonic treatment at a frequency of 30 kHz and a time of 40 minutes to obtain a coating premix.

Step 14: subjecting the coating premix to high-temperature curing treatment, with the curing temperature being 110° C. and the curing time being 3 hours, to obtain an insulating coating.

Summary of Example 5: This example successfully prepared an insulating coating for high-voltage electrical equipment. The coating has excellent electrical properties, such as high dielectric constant, low loss tangent and high electrical breakdown strength, and good thermal stability, and can be used for insulation protection of high-voltage electrical equipment.

Test experiment:

1. Electrical performance test:

Test items: dielectric constant test, loss tangent test, electrical breakdown strength test

2. Thermal stability test:

Test items: Thermogravimetric analysis (TGA), thermal weight loss rate test

3. Physical performance test:

Test items: film thickness test, adhesion test

4. Other performance tests:

Test items: UV resistance test, fire resistance test

Experimental design steps:

Sample preparation:

A coating sample was prepared according to each example and coated on a corresponding substrate.

Electrical performance test:

Use dielectric constant test instrument, loss tangent test instrument and electrical breakdown strength test instrument to test and record the data.

Thermal stability test:

Conduct thermogravimetric analysis experiments and record the weight loss at different temperatures.

Measure the rate of thermal weight loss.

Physical performance test:

The thickness of the coating film is measured using a film thickness measuring instrument.

Conduct adhesion testing.

Other performance tests:

Conduct UV resistance testing to evaluate performance after exposing samples to UV light for a certain period of time.

Fire retardancy tests are conducted to evaluate the fire retardancy of coatings.

data collection:

Record all test data, including example number and test results, see Table 1.

data analysis:

Analyze the test data, compare the performance of different implementations, and verify the summary content.

Summarize:

Embodiment 1:

Electrical properties: low dielectric constant and loss tangent value, high electrical breakdown strength. Thermal stability: stable in thermogravimetric analysis, low thermal weight loss rate.

Physical properties: The film has moderate thickness and good adhesion.

Other properties: Good UV resistance and fire resistance.

Embodiment 2:

Electrical properties: high dielectric constant, large loss tangent value, and average electrical breakdown strength.

Thermal stability: Thermogravimetric analysis shows that the weight loss is faster at high temperature.

Physical properties: The film thickness is relatively thin and the adhesion is average.

Other properties: good UV resistance and average fire resistance.

Embodiment 3:

Electrical properties: The dielectric constant and loss tangent are both low, and the electrical breakdown strength is high.

Thermal stability: The rate of thermal weight loss is low and the thermogravimetric analysis shows stable performance.

Physical properties: The film has moderate thickness and good adhesion.

Other properties: Good UV resistance and fire resistance.

Embodiment 4:

Electrical properties: The dielectric constant and loss tangent values are high, and the electrical breakdown strength is average.

Thermal stability: The thermal weight loss rate is fast, and thermogravimetric analysis shows a large weight loss.

Physical properties: Thick film thickness and good adhesion.

Other properties: general UV resistance, good fire resistance.

Embodiment 5:

Electrical properties: low dielectric constant and loss tangent values, high electrical breakdown strength.

Thermal stability: low thermal weight loss rate and stable thermogravimetric analysis.

Physical properties: The film has moderate thickness and good adhesion.

Other properties: Good UV resistance and fire resistance.

Summarize:

The test experiments prove that the performance of Example 1 and Example 3 is stable and excellent in all aspects, and they are the choices with more comprehensive performance.

The performance of Example 2 and Example 4 is average in some aspects and needs to be evaluated and selected according to specific needs.

Example 5 performs well in most performance indicators and is a reliable choice, especially suitable for application scenarios that require UV resistance and fire resistance.

Comparative experiment 1: Electrical performance comparison

Experimental purpose: To compare the electrical performance of Examples 1, 3 and 5 of the present invention with the existing insulating coating preparation method.

Experimental preparation:

Example 1 Preparation method:

It uses raw materials such as carbon nanotubes, siloxane, and fluoropolymers, and has a certain preparation process.

Example 3 Preparation method:

It uses raw materials such as carbon nanotubes, siloxane, and fluoropolymers, and has different preparation process flows.

Example 5 Preparation method:

Another preparation process is provided using raw materials such as carbon nanotubes, siloxane, and fluoropolymers.

Existing preparation method:

Based on the traditional insulating coating preparation method, it does not contain nano materials and special additives.

Comparative experimental design:

Test samples: Insulating coating samples were prepared from each preparation method.

Test items: dielectric constant, loss tangent, electrical breakdown strength.

Test method: Use appropriate instruments to perform electrical performance tests.

Experimental data table: includes the test results of various electrical performance parameters.

Summary: It can be seen from the experimental data that the insulating coatings prepared in Example 1, Example 3 and Example 5 are superior to the existing preparation methods in terms of electrical properties. Specifically, the dielectric constant is a measure of the responsiveness of a material to an electric field. A higher dielectric constant means a stronger electric field responsiveness, which can provide better insulation performance. The loss tangent is a parameter that measures the energy loss of a material in an electric field. A lower loss tangent means lower energy loss, which is beneficial to improving equipment efficiency. The electrical breakdown strength is a parameter that measures the maximum electric field strength that a material can withstand without electrical breakdown. A higher electrical breakdown strength means better resistance to electrical breakdown, which can provide stronger insulation protection. Therefore, the insulating coatings prepared in Example 1, Example 3 and Example 5 have better electrical properties, can provide better insulation protection, and help improve the safety and reliability of high-voltage electrical equipment.

Comparative experiment 2: thermal stability comparison

Experimental purpose: To compare the thermal stability of Examples 1, 3 and 5 of the present invention with the existing insulating coating preparation method.

Experimental preparation:

Example 1 Preparation method:

It has specific heat treatment steps and material ratios.

Example 3 Preparation method:

Contains different heat treatment steps and material ratios.

Example 5 Preparation method:

There is another heat treatment step and material combination.

Existing preparation method:

Conventional insulating coating preparation methods do not consider nanomaterials and special treatments.

Comparative experimental design:

Test samples: Insulating coating samples were prepared from each preparation method.

Test items: thermal weight loss rate, thermal decomposition temperature, thermal weight loss rate, etc.

Test method: Thermal stability test was performed using a thermogravimetric analyzer.

Experimental data table: record the test results of various thermal stability parameters.

Preparation Thermal weight loss rate (%) Thermal decomposition temperature (℃) Thermal weight loss rate (mg/min) Example 1 5 300 0.05 Example 3 4.5 310 0.04 Example 5 4.8 305 0.045 Existing preparation method 7 280 0.07

Summary: According to experimental data, the insulating coatings prepared in Example 1, Example 3 and Example 5 are superior to the existing preparation methods in terms of thermal stability. Thermal stability is a measure of the ability of a material to maintain stable performance under high temperature conditions. For insulating coatings, good thermal stability is very important because in practical applications, high-voltage electrical equipment may be subjected to high temperature environments or long-term thermal stress. Lower thermal weight loss rate, higher thermal decomposition temperature and lower thermal weight loss rate all indicate that the insulating coatings prepared in Example 1, Example 3 and Example 5 have better thermal stability. This means that these coatings can better maintain their electrical and physical properties under high temperature conditions, thereby providing longer-lasting and more reliable insulation protection.

Comparative experiment 3: physical performance comparison

Experimental purpose: To compare the physical properties of Example 1, Example 3 and Example 5 of the present invention with the existing insulating coating preparation method.

Experimental preparation:

Example 1 Preparation method:

Contains specific physical processing steps and material combinations.

Example 3 Preparation method:

With different physical processing steps and material ratios.

Example 5 Preparation method:

There is another physical processing step and material combination.

Existing preparation method:

Traditional insulating coating preparation methods do not involve nanomaterials and special treatments.

Comparative experimental design:

Test samples: Insulating coating samples were prepared from each preparation method.

Test items: film thickness, adhesion, wear resistance and other physical performance parameters.

Test method: Use corresponding test instruments to conduct physical property tests.

Experimental data table: including the test results of various physical performance parameters.

Preparation Film thickness (μm) Adhesion(grade) Wear resistance(mg) Example 1 200 0 0.1 Example 3 195 0 0.1 Example 5 198 0 0.1 Existing preparation method 220 1 0.2

Summary: Experimental data show that the insulating coatings prepared in Example 1, Example 3 and Example 5 are superior to the existing preparation methods in terms of physical properties. Film thickness is an important parameter to measure the covering ability of the coating. Appropriate film thickness can ensure that the coating can effectively cover the surface of the equipment and provide good insulation protection. Adhesion is the ability of the coating to adhere to the substrate. Better adhesion can ensure that the coating forms a uniform and tight protective film on the surface of the equipment to prevent electrical damage. Wear resistance is the ability of the coating to resist mechanical wear. Better wear resistance can enable the coating to maintain its protective performance during long-term operation and prevent insulation failure caused by mechanical wear. Therefore, the insulating coatings prepared in Example 1, Example 3 and Example 5 have better physical properties, can provide more durable and stable insulation protection, and help extend the service life of high-voltage electrical equipment.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims (9)

1. The insulating paint for the high-voltage electrical equipment is characterized by comprising the following components in percentage by weight: 1% -10% of carbon nano-tubes, 5% -20% of siloxane, 2% -15% of fluorine polymer, 10% -25% of organic silicon resin, 2% -12% of nano ceramic particles, 1% -5% of nanocellulose, 15% -35% of solvent, 3% -10% of talcum powder, 7% -25% of diluent, 1% -8% of additive and 2% -12% of curing agent.

2. The insulating paint for high-voltage electrical equipment according to claim 1, wherein the additive comprises 0.5% -5% of ultraviolet resistance agent, 0.5% -3% of antioxidant agent and 1% -8% of fire retardant agent.

3. The insulating paint for high-voltage electrical equipment according to claim 1, wherein the curing agent is one or more of polyetheramine, formaldehyde and diisocyanate.

4. The insulating paint for high-voltage electrical equipment according to claim 1, wherein the carbon nanotubes have a diameter of 1-100 nm, and the nano ceramic particles have a particle diameter of 1-100 nm.

5. A method for preparing an insulating paint for high-voltage electrical equipment, characterized by comprising the steps of:

Respectively preprocessing carbon nanotubes, siloxane, fluoropolymer, organic silicon resin, nano ceramic particles, nano cellulose, solvent, talcum powder, diluent, additive and curing agent;

mixing and stirring all the pretreated materials in a high-speed stirrer, and stirring for a period of time at a certain stirring speed to obtain a mixed solution;

carrying out ultrasonic treatment on the mixed solution, and carrying out ultrasonic treatment for a period of time in a certain ultrasonic frequency range to obtain a coating premix;

And (3) carrying out high-temperature curing treatment on the coating premix, wherein the curing temperature is 80-150 ℃ and the curing time is 2-4 hours, so as to obtain the insulating coating.

6. The method for producing an insulating paint for high-voltage electrical equipment according to claim 5, wherein the stirring speed is 500 to 2000rpm and the stirring time is 1 to 3 hours.

7. The method for preparing an insulating paint for high-voltage electrical equipment according to claim 5, wherein the ultrasonic frequency is 20-40kHz and the ultrasonic time is 30-60 minutes.

8. The method for preparing the insulating paint for the high-voltage electrical equipment according to claim 5, wherein the specific steps of the pretreatment are as follows:

Soaking the carbon nanotubes in a mixed solution of sulfuric acid and nitric acid in a volume ratio of 2:1 to 4:1 for 10-14h, then washing with deionized water at room temperature until the pH=7, and finally drying at 50-70 ℃ for 20-28h;

Drying the siloxane in an oven at 100-140 ℃ for 3-5 hours to remove moisture and impurities in the siloxane;

drying the fluoropolymer in an oven at 70-90 ℃ for 5-7 hours to remove moisture therefrom;

Drying the organic silicon resin in an oven at 130-170 ℃ for 1-3h to remove water in the organic silicon resin;

Soaking the nano ceramic particles in a mixed solution of sulfuric acid and nitric acid in a volume ratio of 2:1 to 4:1 for 10-14h, washing with deionized water at room temperature until the pH=7, and finally drying at 50-70 ℃ for 20-28h;

Soaking nanocellulose in 0.5-1.5% sulfuric acid solution for 1-3h, washing with deionized water at room temperature to pH=7, and drying at 50-70deg.C for 20-28h;

distilling the solvent through a fractionating tower, and collecting the part with the boiling point of 105-120 ℃;

Drying talcum powder in an oven at 130-170 ℃ for 1-3h to remove water and impurities;

distilling the diluent through a fractionating tower, and collecting the boiling point in the corresponding part;

washing the additive with deionized water at room temperature, and drying at 50-70deg.C for 20-28 hr;

The curing agent is washed with deionized water at room temperature and then dried at 50-70 ℃ for 20-28h.

9. The method for producing an insulating paint for high-voltage electrical equipment according to claim 5, wherein the step of ultrasonic treatment is performed in an ice-water bath, and the step of curing treatment is performed in a vacuum oven.