An injection molding material for encapsulating a highly sealed lightning arrester core and a preparation method thereof

Abstract

This application relates to the technical field of lightning arrester core encapsulation materials, and specifically discloses an injection molding material for high-sealing lightning arrester cores and a preparation method thereof. An injection molding material for high-sealing lightning arrester cores includes the following raw materials in parts by weight: PBT, γ-aminopropyltriethoxysilane, chopped glass fibers, hollow glass microspheres, melamine formaldehyde resin-zinc borate microcapsules, plasticizers, and stabilizers. The preparation method includes the following steps: S1. Mix PBT, hollow glass microspheres, melamine formaldehyde resin-zinc borate microcapsules, plasticizers, and stabilizers to obtain a mixture; S2. Stir and mix the chopped glass fibers, γ-aminopropyltriethoxysilane, and the above mixture, heat and melt, and injection mold to obtain the injection molding material for high-sealing lightning arrester cores. The injection molding material for high-sealing lightning arrester cores prepared in this application has high sealing performance, excellent electrical insulation performance and waterproof performance.

Description

Technical Field

[0001] The present application relates to the technical field of arrester core encapsulation materials, and particularly to an injection molding material for high-sealing arrester cores and a preparation method thereof. Background Art

[0002] Currently, ordinary plastic materials are mostly used as arrester core encapsulation materials. These materials have problems of insufficient sealing performance during the encapsulation process and are easily affected by factors such as environmental humidity and temperature, resulting in a decline in the performance of arresters and a shortening of their service life.

[0003] Existing solutions mostly adopt methods such as improving the encapsulation process and increasing sealant to improve the sealing performance of the encapsulation materials, but these methods have problems such as complex processes, high costs, and poor effects.

[0004] The existing arrester core encapsulation materials have insufficient sealing performance and waterproof performance, and are easily affected by environmental factors, resulting in a decline in the performance of arresters and a shortening of their service life. At the same time, the existing improvement solutions have problems such as complex processes, high costs, and poor effects. Summary of the Invention

[0005] In order to solve at least one of the above technical problems and develop an injection molding material that solves the problem of insufficient sealing performance of arrester core encapsulation materials and improves the service life and performance stability of arresters, the present application provides an injection molding material for high-sealing arrester cores and a preparation method thereof.

[0006] On the one hand, an injection molding material for high-sealing arrester cores provided by the present application includes the following raw materials in parts by weight: 50 - 60 parts of PBT, 3 - 5 parts of γ-aminopropyltriethoxysilane, 15 - 25 parts of chopped glass fiber, 9 - 18 parts of hollow glass microspheres, 5 - 10 parts of melamine formaldehyde resin-boric acid zinc microcapsules, 10 - 15 parts of plasticizer, and 3 - 8 parts of stabilizer.

[0007] By adopting the above technical solution, the injection molding material for high-sealing arrester cores in the present application combines the advantages of various raw materials and realizes the improvement of flame retardancy and antistatic performance. Specifically,

[0008] PBT is an engineering plastic with excellent performance, having excellent insulation performance, flame retardancy, heat resistance, and aging resistance. It can ensure the electrical insulation of arresters in a high-voltage environment, extend the service life of arresters, and also has high strength and toughness, which is convenient for processing.

[0009] Short-cut glass fibers have corrosion resistance, high temperature resistance and electrical insulation properties, and can significantly enhance the mechanical properties of injection molding materials. In injection molding materials, short-cut glass fibers are modified by γ-aminopropyltriethoxysilane and can be evenly dispersed in the injection molding materials, thus tightly combining with the injection molding materials.

[0010] Hollow glass microspheres have a unique hollow spherical structure. Due to the chemical inertness of their surfaces and the closed hollow structure, hollow glass microspheres are not easy to absorb moisture and are not permeable to water, and have excellent waterproof performance. In injection molding materials, when hollow glass microspheres are used in combination with melamine formaldehyde resin-zinc borate microcapsules, the waterproof performance of the injection molding materials will be further improved.

[0011] In this application, the preparation process of melamine formaldehyde resin-zinc borate microcapsules realizes the encapsulation of zinc borate micro by melamine formaldehyde resin through a series of steps, forming a microcapsule with a semi-permeable or closed membrane and a diameter of 10-25 μm. Thus, the flame retardant performance and water resistance of melamine formaldehyde resin-zinc borate microcapsules are significantly improved. When melamine formaldehyde resin-zinc borate microcapsules are selected to prepare injection molding materials, the spherical structure of the microcapsules can form a more uniform dispersion in the injection molding materials, reduce local stress concentration, improve the overall uniformity and sealing performance of the injection molding materials, and effectively enhance the waterproof performance of the injection molding materials.

[0012] Optionally, the preparation method of the melamine formaldehyde resin-zinc borate microcapsules includes the following steps:

[0013] A1. Adjust the pH of the aqueous formaldehyde solution to 8.0-9.0, add melamine and mix and react to obtain a melamine-formaldehyde resin prepolymer;

[0014] A2. Mix the melamine-formaldehyde resin prepolymer and zinc borate, adjust the pH to 5.0-6.0, stir and react, cool, filter by suction and dry to obtain the melamine formaldehyde resin-zinc borate microcapsules.

[0015] Optionally, in the step A1, the mass concentration of the aqueous formaldehyde solution is (35-38)%;

[0016] In the step A1, the weight ratio of the aqueous formaldehyde solution to the melamine is (1.8-2.5):1;

[0017] In the step A2, the weight ratio of the melamine-formaldehyde resin prepolymer to the zinc borate is 1:(2-5).

[0018] Optionally, the weight ratio of the hollow glass microspheres to the melamine formaldehyde resin-zinc borate microcapsules is (1.5-2):1.

[0019] By adopting the above technical solution, hollow glass microspheres and melamine formaldehyde resin-zinc borate microcapsules are compounded. Since their particle sizes are different and the weight ratio between them is defined, the sealing performance of the injection molding material for encapsulating the high-sealing lightning arrester core can be effectively enhanced, and the waterproof performance can be improved.

[0020] Optionally, the weight ratio of the hollow glass microspheres to the melamine formaldehyde resin-zinc borate microcapsules is 1.8:1.

[0021] Optionally, the sum of the weights of the hollow glass microspheres and the melamine formaldehyde resin-zinc borate microcapsules accounts for 15-21.5% of the total weight of the raw materials of the injection molding material for encapsulating the high-sealing lightning arrester core.

[0022] By adopting the above technical solution, when the hollow glass microspheres and the melamine formaldehyde resin-zinc borate microcapsules are important additives in the injection molding material for encapsulating the high-sealing lightning arrester core, their contents have a significant impact on the flame retardancy and antistatic performance of the material. When their total weight accounts for 15-21.5% of the total weight of the raw materials of the injection molding material, the sealing performance of the injection molding material can be enhanced, ensuring that the injection molding material has excellent waterproof performance, while maintaining excellent mechanical properties and electrical insulation properties, and effectively extending the service life.

[0023] Optionally, the plasticizer is trioctyl trimellitate.

[0024] Optionally, the stabilizer is a calcium-zinc composite stabilizer, and the calcium-zinc composite stabilizer includes calcium stearate and zinc stearate with a weight ratio of 1:1.

[0025] In a second aspect, the present application provides a method for preparing the above-mentioned injection molding material for encapsulating the high-sealing lightning arrester core, including the following steps:

[0026] S1. Mix PBT, hollow glass microspheres, melamine formaldehyde resin-zinc borate microcapsules, plasticizer and stabilizer to obtain a mixture;

[0027] S2. Mix chopped glass fibers, γ-aminopropyltriethoxysilane and the mixture obtained in step S1, heat and melt, and injection mold to obtain the injection molding material for encapsulating the high-sealing lightning arrester core.

[0028] By adopting the above technical solution, the method for preparing the injection molding material for encapsulating the high-sealing lightning arrester core provided by the present application can achieve uniform mixing and effective dispersion of the raw materials, ensuring that the injection molding material has excellent electrical insulation performance and waterproof performance. At the same time, this method is simple to operate, has strong controllability, is suitable for industrial production, and has broad application prospects.

[0029] Optionally, the stirring speed in step S2 is 600-700 rpm, and the heating temperature is 230-240 °C.

[0030] In summary, the present invention includes at least one of the following beneficial technical effects:

[0031] 1. The injection molding material for high-sealing arrestor core encapsulation in this application combines the advantages of various raw materials, achieving improvements in flame retardancy and antistatic performance. Specifically, PBT is an engineering plastic with excellent performance, possessing excellent insulation properties, flame retardancy, heat resistance, and aging resistance. It can ensure the electrical insulation of the arrestor in a high-voltage environment, extend the service life of the arrestor, and also has relatively high strength and toughness, facilitating processing; chopped glass fibers have corrosion resistance, high-temperature resistance, and electrical insulation properties, and can significantly enhance the mechanical properties of the injection molding material. In the injection molding material, the chopped glass fibers are modified by γ-aminopropyltriethoxysilane and can be evenly dispersed in the injection molding material, thus tightly combining with the injection molding material; hollow glass microspheres have a unique hollow spherical structure. Due to the chemical inertness of their surface and the enclosed hollow structure, hollow glass microspheres are not easily absorbent of water and are not permeable to water, having excellent waterproof performance. In the injection molding material, when hollow glass microspheres are used in compound with melamine formaldehyde resin-zinc borate microcapsules, the waterproof performance of the injection molding material will be further improved.

[0032] 2. The preparation method of the injection molding material for high-sealing arrestor core encapsulation provided in this application can achieve uniform mixing and effective dispersion of raw materials, ensuring that the injection molding material has excellent electrical insulation properties and waterproof performance. At the same time, this method is simple to operate, has strong controllability, is suitable for industrial production, and has broad application prospects. Detailed implementation manners

[0033] The following further elaborates on this application in conjunction with examples.

[0034] PBT: Dongguan Aisite Plastic Raw Materials Co., Ltd., brand: Changchun, Taiwan, China, PBT-3010;

[0035] γ-aminopropyltriethoxysilane: CAS: 919-30-2, purity 99%;

[0036] Melamine: CAS: 108-78-1, purity 99%;

[0037] Zinc borate: CAS: 10361-94-1, purity 99%;

[0038] Trioctyl trimellitate: CAS: 25103-12-2, purity 99%;

[0039] Calcium stearate: CAS: 1592-23-0, purity 99%;

[0040] Zinc stearate: CAS: 557-05-1, purity 99%;

[0041] Chopped glass fiber: LingShou County Gold Mine Product Processing Factory;

[0042] Hollow glass microspheres: Shijiazhuang Ultra-fine New Materials Technology Co., Ltd. Specific embodiments

[0044] Preparation Examples 1-3

[0045] Preparation Example 1

[0046] This preparation example provides a melamine formaldehyde resin-zinc borate microcapsule, and the preparation method includes the following steps:

[0047] A1. Adjust the pH of the aqueous formaldehyde solution to 8.0, add melamine, mix and stir and react to obtain a melamine-formaldehyde resin prepolymer;

[0048] A2. Mix the melamine-formaldehyde resin prepolymer and zinc borate, adjust the pH to 5.0, stir and react, cool, filter by suction, and dry to obtain a melamine formaldehyde resin-zinc borate microcapsule;

[0049] In step A1, the mass concentration of the aqueous formaldehyde solution is 35%;

[0050] In step A1, the weight ratio of the aqueous formaldehyde solution to the melamine is 1.8:1;

[0051] In step A2, the weight ratio of the melamine-formaldehyde resin prepolymer to zinc borate is 1:2.

[0052] Preparation Example 2

[0053] The difference between this preparation example and Preparation Example 1 is that the preparation method of the melamine formaldehyde resin-zinc borate microcapsule in this preparation example includes the following steps:

[0054] A1. Adjust the pH of the aqueous formaldehyde solution to 8.5, add melamine, mix and stir and react to obtain a melamine-formaldehyde resin prepolymer;

[0055] A2. Mix the melamine-formaldehyde resin prepolymer and zinc borate, adjust the pH to 5.5, stir and react, cool, filter by suction, and dry to obtain a melamine formaldehyde resin-zinc borate microcapsule;

[0056] In step A1, the mass concentration of the aqueous formaldehyde solution is 36%;

[0057] In step A1, the weight ratio of the aqueous formaldehyde solution to the melamine is 2:1;

[0058] In step A2, the weight ratio of the melamine-formaldehyde resin prepolymer to zinc borate is 1:3.

[0059] Preparation Example 3

[0060] The difference between this preparation example and Preparation Example 1 is that the preparation method of the melamine-formaldehyde resin-zinc borate microcapsules in this preparation example includes the following steps:

[0061] A1. Adjust the pH of the aqueous formaldehyde solution to 9.0, add melamine, mix and stir to react to obtain a melamine-formaldehyde resin prepolymer;

[0062] A2. Mix the melamine-formaldehyde resin prepolymer and zinc borate, adjust the pH to 6.0, stir and react, cool, filter by suction, and dry to obtain melamine-formaldehyde resin-zinc borate microcapsules;

[0063] In step A1, the mass concentration of the aqueous formaldehyde solution is 38%;

[0064] In step A1, the weight ratio of the aqueous formaldehyde solution to the melamine is 2.5:1;

[0065] In step A2, the weight ratio of the melamine-formaldehyde resin prepolymer to zinc borate is 1:5.

[0066] Example 1

[0067] This example provides an injection molding material for encapsulating a high-sealing lightning arrester core body, which includes the following raw materials in parts by weight: 50 parts of PBT, 3 parts of γ-aminopropyltriethoxysilane, 15 parts of chopped glass fiber, 12 parts of hollow glass microspheres, 8 parts of melamine-formaldehyde resin-zinc borate microcapsules, 10 parts of plasticizer, and 3 parts of stabilizer.

[0068] The preparation method of the injection molding material for encapsulating a high-sealing lightning arrester core body in this preparation example includes the following steps:

[0069] S1. Mix PBT, hollow glass microspheres, melamine-formaldehyde resin-zinc borate microcapsules, plasticizer and stabilizer to obtain a mixture;

[0070] S2. Stir and mix the chopped glass fiber, γ-aminopropyltriethoxysilane and the above mixture at 650 rpm, heat and melt at 235°C, and injection mold to obtain an injection molding material for encapsulating a high-sealing lightning arrester core body.

[0071] The melamine-formaldehyde resin-zinc borate microcapsules used in this example are prepared from Preparation Example 1.

[0072] The plasticizer in this example is trioctyl trimellitate.

[0073] The stabilizer in this embodiment is a calcium-zinc composite stabilizer, which is composed of calcium stearate and zinc stearate with a weight ratio of 1:1.

[0074] Examples 2 - 4

[0075] Example 2

[0076] The difference between this example and Example 1 is that when preparing the injection molding material for encapsulating the high-sealing lightning arrester core body, the total weight of hollow glass microspheres and melamine formaldehyde resin-zinc borate microcapsules is 20 parts, and the weight ratio of hollow glass microspheres to melamine formaldehyde resin-zinc borate microcapsules is 1.7:1.

[0077] Example 3

[0078] The difference between this example and Example 1 is that when preparing the injection molding material for encapsulating the high-sealing lightning arrester core body, the total weight of hollow glass microspheres and melamine formaldehyde resin-zinc borate microcapsules is 20 parts, and the weight ratio of hollow glass microspheres to melamine formaldehyde resin-zinc borate microcapsules is 1.8:1.

[0079] Example 4

[0080] The difference between this example and Example 1 is that when preparing the injection molding material for encapsulating the high-sealing lightning arrester core body, the total weight of hollow glass microspheres and melamine formaldehyde resin-zinc borate microcapsules is 20 parts, and the weight ratio of hollow glass microspheres to melamine formaldehyde resin-zinc borate microcapsules is 2:1.

[0081] Comparative Examples 1 - 3

[0082] Comparative Example 1

[0083] The difference between this comparative example and Example 3 is that when preparing the injection molding material for encapsulating the high-sealing lightning arrester core body, melamine formaldehyde resin-zinc borate microcapsules were not added.

[0084] Comparative Example 2

[0085] The difference between this comparative example and Example 3 is that when preparing the injection molding material for encapsulating the high-sealing lightning arrester core body, hollow glass microspheres were not added.

[0086] Comparative Example 3

[0087] The difference between this comparative example and Example 3 is that when preparing the injection molding material for encapsulating the high-sealing lightning arrester core body, neither hollow glass microspheres nor melamine formaldehyde resin-zinc borate microcapsules were added.

[0088] Experimental detection:

[0089] Volume resistivity: Tested in accordance with GB / T 1410-2006, the sample size is a 60mm×60mm×2mm square piece.

[0090] Tensile strength: Tested in accordance with the standard of GB / T 1040.2-2006; the tensile speed is 10mm / min.

[0091] Percentage of water absorption: Tested in accordance with the standard of GB / T 1462-2005. At a constant temperature of 100°C in a water bath, 60mm×60mm×2mm square piece samples are immersed in the water bath without overlap. After 48 hours, the samples to be tested are taken out, dried on the surface, and then their mass (m 2 ) is measured. Before immersion, the mass of the sample (m 1 ) is measured. Calculate the percentage of water absorption according to the formula: Percentage of water absorption = (m 2 - m 1 ) / m 1 ×100%.

[0092] See Table 1 for the experimental test results of Examples 1-4 and Comparative Examples 1-3.

[0093] Table 1 - Experimental Test Results Table of Examples 1-4 and Comparative Examples 1-3

[0094]

[0095]

[0096] Result analysis: The differences between Examples 2-4 and Example 1 are that when preparing the injection molding material for high-sealing lightning arrester core body encapsulation, the total weight of hollow glass microspheres and melamine formaldehyde resin-zinc borate microcapsules is 20 parts, and the weight ratio of hollow glass microspheres and melamine formaldehyde resin-zinc borate microcapsules is different. Combining the experimental test results in Table 1, it can be seen that when the weight ratio of hollow glass microspheres and melamine formaldehyde resin-zinc borate microcapsules is 1.8:1, the insulation performance and waterproof performance of the injection molding material for high-sealing lightning arrester core body encapsulation are obtained. The difference between Comparative Example 1 and Example 3 is that when preparing the injection molding material for high-sealing lightning arrester core body encapsulation, melamine formaldehyde resin-zinc borate microcapsules are not added. The difference between Comparative Example 2 and Example 3 is that when preparing the injection molding material for high-sealing lightning arrester core body encapsulation, hollow glass microspheres are not added. The difference between Comparative Example 3 and Example 3 is that when preparing the injection molding material for high-sealing lightning arrester core body encapsulation, neither hollow glass microspheres nor melamine formaldehyde resin-zinc borate microcapsules are added. Combining the experimental test results in Table 1, it can be seen that when preparing the injection molding material for high-sealing lightning arrester core body encapsulation, the compound use of hollow glass microspheres and melamine formaldehyde resin-zinc borate microcapsules can better improve the comprehensive performance of the injection molding material for high-sealing lightning arrester core body encapsulation.

[0097] Examples 5 - 6

[0098] The difference between Examples 5 - 6 and Example 3 lies in that when preparing the injection molding material for high - tightness arrester core encapsulation, the weight parts of some components are changed. See Table 2 for the different parts.

[0099] Table 2 - Table of the different parts between Examples 5 - 6 and Example 3

[0100] Component (parts by weight) Example 3 Example 5 Example 6 PBT 50 55 60 γ-aminopropyltriethoxysilane 3 4 5 Chopped glass fiber 15 20 25 Hollow glass microsphere 12.9 12.9 12.9 Melamine formaldehyde resin-zinc borate microcapsule 7.1 7.1 7.1 Trioctyl trimellitate 10 12 15 Stabilizer 3 5 8

[0101] The experimental test results of Examples 5 - 6 are shown in Table 3.

[0102] Table 3 - Table of the experimental test results of Examples 5 - 6

[0103]

[0104]

[0105] Result analysis: The difference between Examples 5 - 6 and Example 3 lies in that when preparing the injection molding material for high - tightness arrester core encapsulation, the weight parts of some components are different. Combining with the experimental test results in Table 3, it can be known that when preparing the injection molding material for high - tightness arrester core encapsulation, the comprehensive performance of the injection molding material prepared in Example 5 is better.

[0106] Examples 7 - 11

[0107] The difference between Examples 7 - 11 and Example 5 lies in that when preparing the injection molding material for high - tightness arrester core encapsulation, on the premise that the weight ratio of hollow glass microspheres to melamine - formaldehyde resin - zinc borate microcapsules is 1.8:1, the proportion of the total weight of hollow glass microspheres and melamine - formaldehyde resin - zinc borate microcapsules in the flame - retardant and antistatic polyurethane elastomer is changed, and a better weight proportion is optimized.

[0108] In Example 5, the total weight of hollow glass microspheres and halloysite nanotubes - ammonium polyphosphate is 20 parts, and the total weight of the injection molding material for high - tightness arrester core encapsulation is 116 parts.

[0109] Therefore, it is not difficult to obtain that in Example 5, the proportion of the sum of the weights of hollow glass microspheres (referred to as variable 1) and melamine - formaldehyde resin - zinc borate microcapsules (referred to as variable 2) in the total weight of the raw materials of the injection molding material for high - tightness arrester core encapsulation (referred to as the matrix) is 17.2%.

[0110] The difference parts between Examples 7 - 11 and Example 5 are shown in Table 4.

[0111] Proportion = (Variable 1 + Variable 2) / Total weight of matrix * 100%.

[0112] Table 4 - Table of differences between Examples 7 - 11 and Example 5

[0113]

[0114] For the experimental test results of Examples 7 - 11, see Table 5.

[0115] Table 5 - Table of experimental test results of Examples 7 - 11

[0116]

[0117]

[0118] Result analysis: The difference between Examples 7 - 11 and Example 5 is that when preparing the injection - molding material for high - sealing arrestor core encapsulation, when the proportion of hollow glass microspheres (referred to as Variable 1) and melamine - formaldehyde resin - zinc borate microcapsules (referred to as Variable 2) in the injection - molding material for high - sealing arrestor core encapsulation (referred to as the matrix) is between (15 - 21.5)%, the comprehensive performance of the prepared injection - molding material for high - sealing arrestor core encapsulation is better. When the proportion of hollow glass microspheres (referred to as Variable 1) and melamine - formaldehyde resin - zinc borate microcapsules (referred to as Variable 2) in the injection - molding material for high - sealing arrestor core encapsulation (referred to as the matrix) is 19.5%, the comprehensive performance of the prepared injection - molding material for high - sealing arrestor core encapsulation is relatively good.

[0119] Examples 12 - 13

[0120] Example 12

[0121] The difference between this example and Example 9 is that when preparing the injection - molding material for high - sealing arrestor core encapsulation, the preparation parameters of the melamine - formaldehyde resin - zinc borate microcapsules used are different. The melamine - formaldehyde resin - zinc borate microcapsules in this example are prepared from Preparation Example 2.

[0122] Example 13

[0123] The difference between this example and Example 9 is that when preparing the injection - molding material for high - sealing arrestor core encapsulation, the preparation parameters of the melamine - formaldehyde resin - zinc borate microcapsules used are different. The melamine - formaldehyde resin - zinc borate microcapsules in this example are prepared from Preparation Example 3.

[0124] For the experimental test results of Examples 12 - 13, see Table 6.

[0125] Table 6 - Table of experimental test results of Examples 12 - 13

[0126]

[0127] Result analysis: The difference between Examples 12 - 13 and Example 9 lies in that when preparing the injection molding material for encapsulating the highly sealed lightning arrester core, the melamine formaldehyde resin - zinc borate microcapsules prepared from Preparation Example 2 can better improve the comprehensive performance of the injection molding material for encapsulating the highly sealed lightning arrester core.

[0128] The above are all preferred embodiments of this application. The protection scope of this application is not limited thereby. Therefore, all equivalent changes made according to the structure, shape, and principle of this application shall be covered within the protection scope of this application.

Claims

1. An injection molding material for packaging a core of a lightning arrester with high sealing performance, characterized in that: The invention comprises the following raw materials in parts by weight: 50-60 parts of PBT, 3-5 parts of γ-aminopropyltriethoxysilane, 15-25 parts of chopped glass fibers, 9-18 parts of hollow glass microspheres, 5-10 parts of melamine formaldehyde resin-zinc borate microcapsules, 10-15 parts of plasticizer, and 3-8 parts of stabilizer; The preparation method of the melamine formaldehyde resin-zinc borate microcapsules comprises the following steps: A1, adjusting the pH of the formaldehyde aqueous solution to 8.0-9.0, adding melamine, stirring and reacting to obtain a melamine-formaldehyde resin primary polymer; A2, mixing the melamine-formaldehyde resin primary polymer and zinc borate, adjusting the pH to 5.0-6.0, stirring and reacting, cooling, filtering, and drying to obtain the melamine formaldehyde resin-zinc borate microcapsules; The weight ratio of the hollow glass microspheres to the melamine formaldehyde resin-zinc borate microcapsules is (1.5-2):

1.

2. The injection molding material for encapsulating a core of a high-sealing arrester according to claim 1, characterized in that: In the step A1, the mass concentration of the formaldehyde aqueous solution is (35-38)%, and the weight ratio of the formaldehyde aqueous solution to the melamine is (1.8-2.5):1; in the step A2, the weight ratio of the melamine-formaldehyde resin prepolymer to the zinc borate is 1:(2-5).

3. The injection molding material for encapsulating a core of a high-sealing arrester according to claim 1, characterized in that: The weight ratio of the hollow glass microspheres to the melamine formaldehyde resin-zinc borate microcapsules is 1.8:

1.

4. The injection molding material for encapsulating a core of a high-sealing arrester according to claim 1, characterized in that: The total weight of the hollow glass microspheres and the melamine formaldehyde resin-zinc borate microcapsules accounts for 15-21.5% of the total weight of the raw materials of the injection molding material for packaging the core of the high-sealing arrester.

5. The injection molding material for encapsulating a core of a high-sealing arrester according to claim 1, characterized in that: The plasticizer is trioctyl trimellitate.

6. The injection molding material for encapsulating a core of a high-sealing arrester according to claim 1, characterized in that: The stabilizer is a calcium-zinc composite stabilizer, and the calcium-zinc composite stabilizer includes calcium stearate and zinc stearate in a weight ratio of 1:

1.

7. A method for preparing the injection molding material for packaging a high-sealing arrester core according to any one of claims 1 to 6, characterized in that: The following steps are involved: S1, mixing PBT, hollow glass microspheres, melamine formaldehyde resin-zinc borate microcapsules, a plasticizer and a stabilizer to prepare a mixture; S2, stirring and mixing the chopped glass fibers, γ-aminopropyltriethoxysilane and the mixture obtained in step S1, heating and melting, and injection molding to obtain the injection molding material for packaging the core of the high-sealing arrester.

8. The method for preparing the injection molding material for high-sealing arrester core packaging according to claim 7, characterized in that: In step S2, the stirring speed is 600-700 rpm and the heating temperature is 230-240°C.

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