A high-voltage transmission line polymer insulation coating material and preparation method thereof

Abstract

The invention relates to the technical field of insulating coatings, and proposes a high-voltage transmission line polymer insulating coating material and a preparation method thereof. The high-voltage transmission line polymer insulating coating material comprises the following components in parts by weight: 60-70 parts of alkoxy-terminated polydimethylsiloxane, 8-12 parts of methyl silicone oil, 2-4 parts of a cross-linking agent, 0.1-0.3 parts of a catalyst, 2-10 parts of carbon black, 2-10 parts of barium titanate-modified carbide, 6-8 parts of potassium aluminum silicate, and 1-2 parts of an antioxidant. Through the above technical solution, the problems of poor insulation performance and low tensile strength of high-voltage transmission line polymer insulating coating materials in the related art are solved.

Description

Technical Field

[0001] The invention relates to the technical field of insulating coatings, and in particular to a high-voltage transmission line polymer insulating coating material and a preparation method thereof. Background Art

[0002] The safe operation of high-voltage transmission lines is crucial to power transmission, and the performance of insulating coating materials, as a key part to ensure the insulation performance and mechanical strength of transmission lines, directly affects the reliability and stability of transmission lines. At present, the practical application of insulating coating materials for high-voltage transmission lines still has the following problems:

[0003] Inorganic fillers are often added to the formulation of insulating coating materials. However, due to the difference in surface properties between fillers and base materials, agglomeration is likely to occur during the mixing process. The agglomerated areas of fillers will lead to local stress concentration inside the material. When subjected to tensile force, these areas will be damaged first, which will then cause the entire material to break. At the same time, the interface compatibility between the filler and the base is weak. During the stretching process, debonding is likely to occur at the interface, and the stress cannot be effectively transferred from the base to the filler, so that the reinforcing effect of the filler cannot be fully exerted, which ultimately leads to unsatisfactory tensile strength of the insulating coating material.

[0004] Insulating coating materials in a humid environment or in the presence of moisture will destroy the molecular structure of the material, causing surface defects and resulting in poor insulation performance of the insulating coating materials.

[0005] Therefore, in order to meet the strict requirements of high-voltage transmission lines for insulating coating materials and ensure the safe and stable operation of the power system, it is necessary to obtain a high-voltage transmission line polymer insulating coating material with excellent insulation properties and high tensile strength. Summary of the invention

[0006] The present invention provides a high-voltage transmission line polymer insulation coating material and a preparation method thereof, which solves the problems of poor insulation performance and low tensile strength of the high-voltage transmission line polymer insulation coating material in the related art.

[0007] The technical solution of the present invention is as follows:

[0008] The present invention provides a high-voltage transmission line polymer insulation coating material, comprising the following components in parts by weight:

[0009] 60-70 parts of alkoxy-terminated polydimethylsiloxane, 8-12 parts of methyl silicone oil, 2-4 parts of crosslinking agent, 0.1-0.3 parts of catalyst, 2-10 parts of carbon black, 2-10 parts of barium titanate modified carbide, 6-8 parts of potassium aluminum silicate, and 1-2 parts of antioxidant.

[0010] As a further technical solution, the mass ratio of the carbon black to the barium titanate modified carbide is 3:2~5.

[0011] In the present invention, when carbon black and barium titanate modified carbide are compounded, the mass ratio of carbon black to barium titanate modified carbide is 3:2-5, which further improves the insulation performance and tensile strength of the high-voltage transmission line polymer insulation coating material.

[0012] As a further technical solution, the preparation method of the barium titanate modified carbide comprises the following steps: mixing barium titanate, carbide and hydroxypropyl methylcellulose solution, drying and calcining to obtain the barium titanate modified carbide.

[0013] As a further technical solution, the mass ratio of the barium titanate to the carbide is 4:5-8;

[0014] The mass volume ratio of hydroxypropyl methylcellulose to the solvent in the hydroxypropyl methylcellulose solution is 1g:10-15mL;

[0015] The mass ratio of the hydroxypropyl methylcellulose to the carbide is 1:8-10; and the solvent includes water.

[0016] As a further technical solution, the carbide includes one or both of silicon carbide and boron carbide;

[0017] The particle size of the carbide is 5-10 μm; the particle size of the barium titanate is 30-50 nm.

[0018] As a further technical solution, the cross-linking agent includes one or both of vinyl trimethoxy silane and methyl triethoxy silane; the catalyst includes a titanate compound or an organic tin compound; the antioxidant includes one or more of antioxidant 1010, antioxidant 225, antioxidant 168, and antioxidant 1076; the alkoxy-terminated polydimethylsiloxane includes one or both of methyl dimethoxy-terminated polydimethylsiloxane and trimethoxy-terminated polydimethylsiloxane.

[0019] As a further technical solution, the following components are also included in parts by weight: 2 to 4 parts of 3-nitrophthalimide.

[0020] The present invention also proposes a method for preparing a high-voltage transmission line polymer insulation coating material, comprising the following steps:

[0021] After the alkoxy-terminated polydimethylsiloxane, methyl silicone oil, catalyst, carbon black, barium titanate-modified carbide, potassium aluminum silicate and antioxidant are mixed for the first time, the remaining components are added and mixed for the second time to obtain a polymer insulating coating material.

[0022] The present invention also proposes a method for preparing a high-voltage transmission line polymer insulation coating material, comprising the following steps:

[0023] S1, dissolving 3-nitrophthalimide, mixing the mixture with the carbon black and the barium titanate-modified carbide, and drying the mixture to obtain a modified filler;

[0024] S2. After the alkoxy-terminated polydimethylsiloxane, methyl silicone oil, catalyst, modified filler, potassium aluminum silicate and antioxidant are mixed for the first time, the remaining components are added and mixed for the second time to obtain a polymer insulating coating material.

[0025] In the present invention, 3-nitrophthalimide is used to first modify carbon black and barium titanate modified carbide, and then mixed with other components, thereby further improving the insulation performance and tensile strength of the high-voltage transmission line polymer insulation coating material.

[0026] As a further technical solution, the first mixing time is 40 to 60 minutes;

[0027] The temperature of the second mixing is 60-70° C. and the time is 30-40 min.

[0028] The working principle and beneficial effects of the present invention are:

[0029] In the present invention, alkoxy-terminated polydimethylsiloxane is used as the main raw material of the polymer insulation coating material for high-voltage transmission lines, and carbon black and barium titanate-modified carbide are added for compounding. The two work together to significantly improve the insulation performance and tensile strength of the polymer insulation coating material for high-voltage transmission lines. DETAILED DESCRIPTION

[0030] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments 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.

[0031] Example 1

[0032] High-voltage transmission line polymer insulation coating material, including the following components in parts by weight:

[0033] 65 parts of trimethoxy-terminated polydimethylsiloxane (viscosity 10000mPa·s), 10 parts of methyl silicone oil, 3 parts of methyltriethoxysilane, 0.2 parts of dibutyltin dilaurate, 4 parts of carbon black (model N330), 8 parts of barium titanate-modified silicon carbide, 7 parts of potassium aluminum silicate, 1 part of antioxidant 1010;

[0034] The preparation method of barium titanate modified silicon carbide comprises the following steps: mixing barium titanate (with a particle size of 30 nm), silicon carbide (with a particle size of 10 μm), and a hydroxypropyl methylcellulose solution, drying, and calcining to obtain barium titanate modified silicon carbide; wherein the mass ratio of barium titanate to silicon carbide is 4:6, the mass volume ratio of hydroxypropyl methylcellulose to water in the hydroxypropyl methylcellulose solution is 1 g:10 mL, and the mass ratio of hydroxypropyl methylcellulose to silicon carbide is 1:10;

[0035] A method for preparing a polymer insulating coating material for a high-voltage transmission line comprises the following steps:

[0036] Trimethoxy-terminated polydimethylsiloxane, methyl silicone oil, dibutyltin dilaurate, carbon black, barium titanate-modified silicon carbide, potassium aluminum silicate, and antioxidant 1010 were mixed for 60 minutes, and the remaining components were added and mixed at 70° C. for 30 minutes to obtain a polymer insulating coating material.

[0037] Example 2

[0038] High-voltage transmission line polymer insulation coating material, including the following components in parts by weight:

[0039] 50 parts of trimethoxy-terminated polydimethylsiloxane (viscosity 10000mPa·s), 10 parts of methyldimethoxy-terminated polydimethylsiloxane (viscosity 10000mPa·s), 8 parts of methyl silicone oil, 2 parts of methyltriethoxysilane, 0.1 parts of dibutyltin diacetate, 2 parts of carbon black (model N330), 2 parts of barium titanate-modified silicon carbide, 6 parts of potassium aluminum silicate, 1 part of antioxidant 1010;

[0040] The preparation method of barium titanate modified silicon carbide comprises the following steps: mixing barium titanate (with a particle size of 50 nm), silicon carbide (with a particle size of 5 μm), and a hydroxypropyl methylcellulose solution, drying, and calcining to obtain barium titanate modified silicon carbide; wherein the mass ratio of barium titanate to silicon carbide is 4:5, the mass volume ratio of hydroxypropyl methylcellulose to water in the hydroxypropyl methylcellulose solution is 1 g:15 mL, and the mass ratio of hydroxypropyl methylcellulose to silicon carbide is 1:10;

[0041] A method for preparing a polymer insulating coating material for a high-voltage transmission line comprises the following steps:

[0042] Trimethoxy-terminated polydimethylsiloxane, methyldimethoxy-terminated polydimethylsiloxane, methyl silicone oil, dibutyltin diacetate, carbon black, barium titanate-modified silicon carbide, potassium aluminum silicate, and antioxidant 1010 were mixed for 40 minutes, and the remaining components were added and mixed at 60° C. for 40 minutes to obtain a polymer insulating coating material.

[0043] Example 3

[0044] High-voltage transmission line polymer insulation coating material, including the following components in parts by weight:

[0045] 70 parts of methyl dimethoxy-terminated polydimethylsiloxane (viscosity 10000mPa·s), 12 parts of methyl silicone oil, 4 parts of methyl triethoxysilane, 0.3 parts of dibutyltin diacetate, 10 parts of carbon black (model N330), 10 parts of barium titanate-modified boron carbide, 8 parts of potassium aluminum silicate, 1 part of antioxidant 1010, and 1 part of antioxidant 168;

[0046] The preparation method of barium titanate modified boron carbide comprises the following steps: mixing barium titanate (with a particle size of 50 nm), boron carbide (with a particle size of 10 μm), and a hydroxypropyl methylcellulose solution, drying, and calcining to obtain barium titanate modified boron carbide; wherein the mass ratio of barium titanate to boron carbide is 4:5, the mass volume ratio of hydroxypropyl methylcellulose to water in the hydroxypropyl methylcellulose solution is 1 g:10 mL, and the mass ratio of hydroxypropyl methylcellulose to boron carbide is 1:8;

[0047] A method for preparing a polymer insulating coating material for a high-voltage transmission line comprises the following steps:

[0048] Methyl dimethoxy-terminated polydimethylsiloxane, methyl silicone oil, dibutyltin diacetate, carbon black, barium titanate-modified boron carbide, potassium aluminum silicate, antioxidant 1010, and antioxidant 168 were mixed for 50 minutes, and the remaining components were added and mixed at 65° C. for 35 minutes to obtain a polymer insulating coating material.

[0049] Example 4

[0050] The only difference between this embodiment and embodiment 1 is that, in parts by weight, the components of the high-voltage transmission line polymer insulation coating material include 8 parts of carbon black and 4 parts of barium titanate-modified silicon carbide.

[0051] Example 5

[0052] The only difference between this embodiment and embodiment 1 is that, in parts by weight, the components of the high-voltage transmission line polymer insulation coating material include 7.2 parts of carbon black and 4.8 parts of barium titanate-modified silicon carbide.

[0053] Example 6

[0054] The only difference between this embodiment and embodiment 1 is that, in parts by weight, the components of the high-voltage transmission line polymer insulation coating material include 4.5 parts of carbon black and 7.5 parts of barium titanate-modified silicon carbide.

[0055] Example 7

[0056] The difference between this embodiment and embodiment 6 is that the high-voltage transmission line polymer insulation coating material further includes the following components in parts by weight: 2 parts of 3-nitrophthalimide;

[0057] A method for preparing a polymer insulating coating material for a high-voltage transmission line comprises the following steps:

[0058] Trimethoxy-terminated polydimethylsiloxane, methyl silicone oil, dibutyltin dilaurate, carbon black, 3-nitrophthalimide, barium titanate-modified silicon carbide, potassium aluminum silicate, and antioxidant 1010 were mixed for 60 minutes, and the remaining components were added and mixed at 70° C. for 30 minutes to obtain a polymer insulating coating material.

[0059] Example 8

[0060] The difference between this embodiment and embodiment 7 is that the preparation method of the polymer insulation coating material for high-voltage transmission line includes the following steps:

[0061] S1, dissolving 3-nitrophthalimide in 100 parts by volume of 70% ethanol, adding carbon black and barium titanate-modified silicon carbide, mixing, and drying to obtain a modified filler;

[0062] S2. Mix trimethoxy-terminated polydimethylsiloxane, methyl silicone oil, dibutyltin dilaurate, modified filler, potassium aluminum silicate, and antioxidant 1010 for 60 minutes, add the remaining components and mix at 70° C. for 30 minutes to obtain a polymer insulating coating material.

[0063] Example 9

[0064] The difference between this embodiment and embodiment 6 is that the high-voltage transmission line polymer insulation coating material further includes the following components in parts by weight: 4 parts of 3-nitrophthalimide;

[0065] A method for preparing a polymer insulating coating material for a high-voltage transmission line comprises the following steps:

[0066] S1. Dissolving 3-nitrophthalimide in 100 mL of 70% ethanol by volume, adding carbon black and barium titanate-modified silicon carbide, mixing, and drying to obtain a modified filler;

[0067] S2. Mix trimethoxy-terminated polydimethylsiloxane, methyl silicone oil, dibutyltin dilaurate, modified filler, potassium aluminum silicate, and antioxidant 1010 for 60 minutes, add the remaining components and mix at 70° C. for 30 minutes to obtain a polymer insulating coating material.

[0068] Comparative Example 1

[0069] The difference between this comparative example and Example 1 is that the carbon black is replaced by barium titanate-modified silicon carbide.

[0070] Comparative Example 2

[0071] The difference between this comparative example and Example 1 is that the barium titanate-modified silicon carbide is replaced by carbon black.

[0072] Comparative Example 3

[0073] The difference between this comparative example and Example 1 is that 8 parts of barium titanate-modified silicon carbide are replaced by 3.2 parts of barium titanate and 4.8 parts of silicon carbide.

[0074] Performance Testing

[0075] Tensile strength: The high-voltage transmission line polymer insulation coating materials prepared in Examples 1 to 9 and Comparative Examples 1 to 3 were respectively made into Type 2 dumbbell-shaped specimens in accordance with the standard GB / T 528-2009 "Determination of tensile stress-strain properties of vulcanized rubber or thermoplastic rubber" for tensile strength testing:

[0076] Insulation performance: After the high-voltage transmission line polymer insulation coating materials prepared in Examples 1 to 9 and Comparative Examples 1 to 3 were formed, the breakdown voltage test was performed according to the standard GB / T 1408.1-2016 "Electrical strength test method for insulating materials Part 1: Test at power frequency". The test conditions were: electric heating at 100°C for 2h, cooling for 3h, 3 cycles, in normal water, fast voltage boost mode, and voltage boost speed of 2000V / s;

[0077] The results are shown in Table 1 below.

[0078] Table 1 Performance test results of high voltage transmission line polymer insulation coating materials of Examples 1 to 9 and Comparative Examples 1 to 3

[0079]

[0080] By comparing the data of Examples 1 to 9 and Comparative Examples 1 to 3, it is found that compared with Comparative Examples 1 to 3, the tensile strength and breakdown voltage of the high-voltage transmission line polymer insulation coating materials prepared in Examples 1 to 9 are higher, indicating that the addition of carbon black and barium titanate-modified carbide for compounding, the two work together to significantly improve the insulation performance and tensile strength of the high-voltage transmission line polymer insulation coating materials.

[0081] By comparing the data of Examples 1, 4 to 6, it is found that compared with Examples 1 and 4, the tensile strength and breakdown voltage of the high-voltage transmission line polymer insulation coating material prepared in Examples 5 to 6 are higher, indicating that when carbon black and barium titanate modified carbide are compounded, the mass ratio of carbon black and barium titanate modified carbide is 3:2 to 5, which further improves the insulation performance and tensile strength of the high-voltage transmission line polymer insulation coating material.

[0082] By comparing the data of Examples 6 to 9, it is found that compared with Examples 6 to 7, the tensile strength and breakdown voltage of the high-voltage transmission line polymer insulation coating material prepared in Examples 8 to 9 are higher, indicating that the carbon black and barium titanate-modified carbide are first modified with 3-nitrophthalimide and then mixed with other components, which further improves the insulation performance and tensile strength of the high-voltage transmission line polymer insulation coating material.

[0083] In addition to the above tests on the high-voltage transmission line polymer insulation coating material prepared in Example 1, the following tests were also conducted, and the results are shown in Table 2.

[0084] Table 2 Performance test results of high voltage transmission line polymer insulation coating material of Example 1

[0085]

[0086] It can be seen that the high-voltage transmission line polymer insulation coating material prepared by the present invention not only has excellent insulation performance and tensile strength, but also has the characteristics of light weight and aging resistance.

[0087] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A high-voltage transmission line polymer insulation coating material, characterized in that: The composition comprises the following components in parts by weight: 60-70 parts of alkoxy-terminated polydimethylsiloxane, 8-12 parts of methyl silicone oil, 2-4 parts of crosslinking agent, 0.1-0.3 parts of catalyst, 2-10 parts of carbon black, 2-10 parts of barium titanate modified carbide, 6-8 parts of potassium aluminum silicate, 1-2 parts of antioxidant; The preparation method of the barium titanate modified carbide comprises the following steps: mixing barium titanate, carbide and hydroxypropyl methylcellulose solution, drying and calcining to obtain the barium titanate modified carbide; The mass ratio of barium titanate to carbide is 4:5-8; The mass volume ratio of hydroxypropyl methylcellulose to the solvent in the hydroxypropyl methylcellulose solution is 1g:10-15mL; The mass ratio of the hydroxypropyl methylcellulose to the carbide is 1:8-10; The carbide includes one or both of silicon carbide and boron carbide.

2. A high voltage transmission line polymer insulation coating material according to claim 1, characterized in that: The mass ratio of the carbon black to the barium titanate modified carbide is 3:2-5.

3. A high voltage transmission line polymer insulation coating material according to claim 1, characterized in that: The particle size of the carbide is 5-10 μm; the particle size of the barium titanate is 30-50 nm.

4. A high-voltage transmission line polymer insulation coating material according to claim 1, characterized in that: The cross-linking agent includes one or both of vinyl trimethoxysilane and methyl triethoxysilane; the catalyst includes a titanate compound or an organic tin compound; the antioxidant includes one or more of antioxidant 1010, antioxidant 225, antioxidant 168, and antioxidant 1076; the alkoxy-terminated polydimethylsiloxane includes one or both of methyl dimethoxy-terminated polydimethylsiloxane and trimethoxy-terminated polydimethylsiloxane.

5. A high voltage transmission line polymer insulation coating material according to claim 4, characterized in that: The invention also comprises the following components in parts by weight: 2 to 4 parts of 3-nitrophthalimide.

6. The method for preparing a high-voltage transmission line polymer insulation coating material according to any one of claims 1 to 4, characterized in that: The following steps are involved: After the alkoxy-terminated polydimethylsiloxane, methyl silicone oil, catalyst, carbon black, barium titanate-modified carbide, potassium aluminum silicate and antioxidant are mixed for the first time, the remaining components are added and mixed for the second time to obtain a polymer insulating coating material.

7. The method for preparing a high-voltage transmission line polymer insulation coating material according to claim 5, characterized in that: The following steps are involved: S1, dissolving 3-nitrophthalimide, mixing the mixture with the carbon black and the barium titanate-modified carbide, and drying the mixture to obtain a modified filler; S2. After the alkoxy-terminated polydimethylsiloxane, methyl silicone oil, catalyst, modified filler, potassium aluminum silicate and antioxidant are mixed for the first time, the remaining components are added and mixed for the second time to obtain a polymer insulating coating material.

8. The method for preparing a high-voltage transmission line polymer insulation coating material according to claim 6 or claim 7, characterized in that: The first mixing time is 40 to 60 minutes; The temperature of the second mixing is 60-70° C. and the time is 30-40 min.

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