A high-strength rod-shaped porcelain insulator and its preparation method

Abstract

The present invention provides a high-strength rod-shaped porcelain insulator and a preparation method thereof. The high-strength rod-shaped porcelain insulator comprises the following raw materials in parts by weight: 50-70 parts of bauxite, 20-30 parts of feldspar powder, 10-20 parts of mullite powder, 20-40 parts of alumina powder, 5-20 parts of silica fine powder, 5-15 parts of boron nitride powder, 10-20 parts of tourmaline powder, 5-10 parts of semi-carbonized straw fiber, and 5-10 parts of diethyl succinate. The semi-carbonized straw fiber is obtained by pyrolyzing straw under anaerobic conditions. The high-strength rod-shaped porcelain insulator of the present application has excellent strength performance and can maintain good working stability under harsh climates.

Description

Technical Field

[0001] The present invention relates to the technical field of insulators, and particularly relates to a high-strength rod-shaped porcelain insulator and a preparation method thereof. Background Art

[0002] As a special insulating control component, insulators play a crucial role in overhead transmission lines. In the early days, insulators were mainly applied to utility poles, and later gradually developed to hanging multi-disk insulators on high-voltage wire connection towers. These insulators are designed to increase the creepage distance and are usually made of glass or ceramic materials, and are called porcelain insulators. The design of insulators needs to ensure that they will not fail due to various mechanical and electrical stresses caused by changes in environmental and electrical load conditions, otherwise they will not be able to play their key role, thereby damaging the service and operation life of the entire line. According to the different voltage levels of use, insulators can be divided into two categories: low-voltage insulators and high-voltage insulators. High-voltage insulators are particularly suitable for high-voltage and extra-high-voltage overhead transmission lines and substations. In order to meet the requirements of different voltage levels, different numbers of the same type of single insulators are usually combined into insulator strings or multi-section insulating supports. With the increasingly complex environmental conditions, including the destructive power of harsh climates such as ice and frost, and natural disasters such as earthquakes, higher requirements are put forward for the electrical and mechanical properties of column porcelain insulators in high-voltage transmission lines. In the transmission lines of 110KV to 330KV, the porcelain mechanical strength grade of column porcelain insulators needs to reach more than 15KN, the bending strength requirement is between 180-200MPa, and the impact toughness also needs to meet high standards. However, the existing rod-shaped post porcelain insulators have low tensile strength and are extremely easy to be damaged due to insufficient strength under harsh climate conditions, thus affecting the smoothness of the transmission line. Summary of the Invention

[0003] In view of this, the present invention proposes a high-strength rod-shaped porcelain insulator and a preparation method thereof to solve the above problems.

[0004] The technical solution of the present invention is realized as follows: A high-strength rod-shaped porcelain insulator, comprising the following raw materials in parts by weight: 50-70 parts of bauxite, 20-30 parts of feldspar powder, 10-20 parts of mullite powder, 20-40 parts of alumina powder, 5-20 parts of silica micro-powder, 5-15 parts of boron nitride powder, 10-20 parts of tourmaline powder, 5-10 parts of semi-carbonized straw fiber, 5-15 parts of black phosphorus powder, 5-10 parts of diethyl succinate;

[0005] Among them, the semi-carbonized straw fiber is obtained by pyrolyzing straw under anaerobic conditions.

[0006] Further, the semi-carbonized straw fiber is prepared by the following method: The straw is cleaned and then pretreated. After the pretreatment is completed, the straw is crushed to obtain short straw material. Then, the short straw material is added to a pyrolysis device and pyrolyzed under anaerobic conditions. After the pyrolysis is completed and cooled, the semi-carbonized straw fiber is collected.

[0007] Further, the pyrolysis temperature is 325 - 330 °C.

[0008] Further, the pretreatment method of the straw is: The straw is added to an aqueous nitric acid solution and soaked for 10 - 12 h, and the straw is stirred once every 2.0 - 2.5 h during the soaking process.

[0009] Further, the mass concentration of the aqueous nitric acid solution is 50 - 60 wt%.

[0010] Further, the tourmaline powder is composed of magnesium tourmaline powder, iron tourmaline powder, and chromium tourmaline powder with a mass ratio of (2.0 - 4.0):(1.0 - 2.5):(0.5 - 1.7).

[0011] Further, the straw is one of wheat straw, corn straw, sesame straw, and rice straw.

[0012] Further, the preparation method of the high-strength rod-shaped porcelain insulator includes the following steps:

[0013] S1. Weigh bauxite, feldspar powder, mullite powder, alumina powder, silica micropowder, boron nitride powder, tourmaline powder, semi-carbonized straw fiber, black phosphorus powder, and diethyl succinate by weight, mix them, and grind them with water in a ball mill to form a slurry.

[0014] S2. Pour the slurry into a mold and form a blank of the rod-shaped porcelain insulator through a pressing process.

[0015] S3. Immerse the blank in the glaze melt for 30 - 60 s. After glazing, put the blank into a gas kiln for sintering. After the sintering is completed, it is naturally cooled to obtain the rod-shaped porcelain insulator.

[0016] Further, in S2, the forming pressure of the pressing process is 50 - 100 MPa, and the forming time is 15 - 25 min.

[0017] Further, in S3, the sintering temperature is 1200 - 1400 °C, and the sintering time is 12 - 18 h.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows: In the raw materials of the insulator of the present application, semi-carbonized straw fiber is adopted. During the pyrolysis process, the semi-carbonized straw fiber retains part of its fiber form, and these fibers connect ceramic particles like "bridges", enhancing the adhesion between the raw materials. During the pressing and sintering processes, this adhesion helps to reduce the formation of microcracks and pores, improving the density and overall strength of the insulator. The flexibility of the semi-carbonized straw fiber enables it to absorb part of the energy when the insulator is impacted or bent, and disperse the stress through the stretching and deformation of the fiber, thereby improving the toughness and flexural strength of the insulator.

[0019] The tourmaline powder used in the present application plays a filling role in the insulator material. It can fill the tiny pores and defects in the material, reduce the number of stress concentration points, improve the overall density and uniformity of the material, and thus enhance the mechanical strength of the insulator. The addition of boron nitride can also enhance the structural stability of the insulator material. Due to its good thermal stability and chemical stability, boron nitride can still maintain stable performance under high temperature, high pressure or corrosive environments, thereby ensuring the normal operation of the insulator under harsh working conditions. Boron nitride and tourmaline powder also have a certain synergistic strengthening effect in the insulator material. The high hardness and wear resistance provided by boron nitride can be combined with the piezoelectric effect and filling effect of tourmaline powder to jointly enhance the mechanical strength and durability of the insulator. In addition, boron nitride can also improve the dispersion of tourmaline powder in the material to a certain extent, improving the uniformity and density of the overall material. Furthermore, it ensures that the porcelain insulator has good mechanical strength and product performance. In addition, by adding black phosphorus in the present application, it helps to quickly conduct the heat inside the insulator, prevent breakdown caused by overheating, and thus improve the breakdown voltage of the insulator. Specific Embodiments

[0020] To better understand the technical content of the present invention, specific embodiments are provided below to further illustrate the present invention.

[0021] Unless otherwise specified, the experimental methods used in the embodiments of the present invention are all conventional methods.

[0022] Unless otherwise specified, the materials, reagents, etc. used in the embodiments of the present invention can all be obtained from commercial channels.

[0023] Example 1

[0024] A high-strength rod-shaped porcelain insulator, comprising the following raw materials in parts by weight: 50 parts of bauxite, 20 parts of feldspar powder, 10 parts of mullite powder, 20 parts of alumina powder, 5 parts of silica fine powder, 5 parts of boron nitride powder, 10 parts of tourmaline powder, 5 parts of semi-carbonized straw fiber, 5 parts of black phosphorus powder, and 5 parts of diethyl succinate. Among them, the semi-carbonized straw fiber is obtained by pyrolyzing straw under anaerobic conditions. Specifically, it is prepared by the following method: After cleaning the straw, it is added to a nitric acid aqueous solution with a mass concentration of 50wt% and soaked for 12h for pretreatment. During the soaking process, the straw is stirred every 2.5h. After the pretreatment is completed, the straw is crushed to obtain short straw materials. Then, the short straw materials are added to a pyrolysis device and pyrolyzed under anaerobic conditions at a temperature of 325°C. After the pyrolysis is completed and cooled, the semi-carbonized straw fiber is collected. The tourmaline powder therein is composed of magnesium tourmaline powder, iron tourmaline powder, and chromium tourmaline powder with a mass ratio of 2.0:1.0:0.5. The straw is wheat straw.

[0025] The preparation method of the above-mentioned high-strength rod-shaped porcelain insulator comprises the following steps:

[0026] S1. Weigh bauxite, feldspar powder, mullite powder, alumina powder, silica fine powder, boron nitride powder, tourmaline powder, semi-carbonized straw fiber, black phosphorus powder, and diethyl succinate according to parts by weight, mix them, and add water for ball milling in a ball mill to form a slurry.

[0027] S2. Pour the slurry into a mold and form a blank of the rod-shaped porcelain insulator through a pressing process. Among them, the forming pressure is 50MPa and the forming time is 25min.

[0028] S3. Immerse the blank in the glaze melt for 30s. After glazing, put the blank into a gas kiln and sinter it at 12000°C for 18h. After the sintering is completed, it is naturally cooled to obtain the rod-shaped porcelain insulator.

[0029] Example 2

[0030] A high-strength rod-shaped porcelain insulator, comprising the following raw materials in parts by weight: 50 parts of bauxite, 20 parts of feldspar powder, 10 parts of mullite powder, 20 parts of alumina powder, 5 parts of silica fine powder, 5 parts of boron nitride powder, 10 parts of tourmaline powder, 5 parts of semi-carbonized straw fiber, 5 parts of black phosphorus powder, and 5 parts of diethyl succinate. Among them, the semi-carbonized straw fiber is obtained by pyrolyzing straw under anaerobic conditions. Specifically, it is prepared by the following method: After washing the straw, it is added to a nitric acid aqueous solution with a mass concentration of 60wt% and soaked for 102h for pretreatment. During the soaking process, the straw is stirred every 2.0h. After the pretreatment is completed, the straw is crushed to obtain short straw material, and then the short straw material is added to a pyrolysis device and pyrolyzed under anaerobic conditions at a temperature of 330°C. After the pyrolysis is completed and cooled, the semi-carbonized straw fiber is collected. The tourmaline powder therein is composed of magnesium tourmaline powder, iron tourmaline powder, and chromium tourmaline powder with a mass ratio of 4.0:2.5:0.5. The straw is corn straw.

[0031] The preparation method of the above-mentioned high-strength rod-shaped porcelain insulator comprises the following steps:

[0032] S1. Weigh bauxite, feldspar powder, mullite powder, alumina powder, silica fine powder, boron nitride powder, tourmaline powder, semi-carbonized straw fiber, black phosphorus powder, and diethyl succinate according to parts by weight, mix them, and grind them with water in a ball mill to form a slurry;

[0033] S2. Pour the slurry into a mold and form a blank of the rod-shaped porcelain insulator through a pressing process. Among them, the forming pressure is 100MPa and the forming time is 155min.

[0034] S3. Immerse the blank in the glaze melt for 60s. After glazing, put the blank into a gas kiln and sinter it at 1400°C for 12h. After sintering is completed, obtain the rod-shaped porcelain insulator through natural cooling.

[0035] Example 3

[0036] A high-strength rod-shaped porcelain insulator, comprising the following raw materials in parts by weight: 60 parts of bauxite, 25 parts of feldspar powder, 15 parts of mullite powder, 30 parts of alumina powder, 12 parts of silica fine powder, 10 parts of boron nitride powder, 15 parts of tourmaline powder, 8 parts of semi-carbonized straw fiber, 10 parts of black phosphorus powder, and 7 parts of diethyl succinate. Among them, the semi-carbonized straw fiber is obtained by pyrolyzing straw under anaerobic conditions. Specifically, it is prepared by the following method: After washing the straw, it is added to a nitric acid aqueous solution with a mass concentration of 55wt% and soaked for 11h for pretreatment. During the soaking process, the straw is stirred every 2.2h. After the pretreatment is completed, the straw is crushed to obtain short straw material, and then the short straw material is added to a pyrolysis device and pyrolyzed under anaerobic conditions at a temperature of 327.5°C. After the pyrolysis is completed and cooled, the semi-carbonized straw fiber is collected. The tourmaline powder therein is composed of magnesium tourmaline powder, iron tourmaline powder, and chromium tourmaline powder with a mass ratio of 3.0:1.8:1.1. The straw is sesame straw.

[0037] The preparation method of the above-mentioned high-strength rod-shaped porcelain insulator comprises the following steps:

[0038] S1. Weigh bauxite, feldspar powder, mullite powder, alumina powder, silica fine powder, boron nitride powder, tourmaline powder, semi-carbonized straw fiber, black phosphorus powder, and diethyl succinate according to parts by weight, mix them, and add water for ball milling in a ball mill to form a slurry;

[0039] S2. Pour the slurry into a mold and form a blank of the rod-shaped porcelain insulator through a pressing process. Among them, the forming pressure is 75MPa and the forming time is 20min.

[0040] S3. Immerse the blank in the glaze melt for 45s. After glazing, put the blank into a gas kiln and sinter it at 1300°C for 15h. After the sintering is completed, it is naturally cooled to obtain the rod-shaped porcelain insulator.

[0041] Example 4

[0042] A high-strength rod-shaped porcelain insulator, comprising the following raw materials in parts by weight: 70 parts of bauxite, 30 parts of feldspar powder, 20 parts of mullite powder, 40 parts of alumina powder, 20 parts of silica fine powder, 15 parts of boron nitride powder, 20 parts of tourmaline powder, 10 parts of semi-carbonized straw fiber, 15 parts of black phosphorus powder, and 10 parts of diethyl succinate. Among them, the semi-carbonized straw fiber is obtained by pyrolyzing straw under anaerobic conditions. Specifically, it is prepared by the following method: After washing the straw, it is added to a nitric acid aqueous solution with a mass concentration of 50wt% and soaked for 12h for pretreatment. During the soaking process, the straw is stirred every 2.5h. After the pretreatment is completed, the straw is crushed to obtain short straw material, and then the short straw material is added to a pyrolysis device and pyrolyzed under anaerobic conditions at a temperature of 325°C. After the pyrolysis is completed and cooled, the semi-carbonized straw fiber is collected. The tourmaline powder therein is composed of magnesium tourmaline powder, iron tourmaline powder, and chromium tourmaline powder in a mass ratio of 2.0:1.0:0.5. The straw is rice straw.

[0043] The preparation method of the above-mentioned high-strength rod-shaped porcelain insulator comprises the following steps:

[0044] S1. Weigh bauxite, feldspar powder, mullite powder, alumina powder, silica fine powder, boron nitride powder, tourmaline powder, semi-carbonized straw fiber, black phosphorus powder, and diethyl succinate according to parts by weight, mix them, and add water for ball milling in a ball mill to form a slurry;

[0045] S2. Pour the slurry into a mold and form a blank of the rod-shaped porcelain insulator through a pressing process. Among them, the forming pressure is 50MPa and the forming time is 25min.

[0046] S3. Immerse the blank in the glaze melt for 30s. After glazing, put the blank into a gas kiln and sinter it at 1200°C for 18h. After the sintering is completed, it is naturally cooled to obtain the rod-shaped porcelain insulator.

[0047] Example 5

[0048] A high-strength rod-shaped porcelain insulator, comprising the following raw materials in parts by weight: 70 parts of bauxite, 30 parts of feldspar powder, 120 parts of mullite powder, 40 parts of alumina powder, 20 parts of silica fine powder, 15 parts of boron nitride powder, 20 parts of tourmaline powder, 10 parts of semi-carbonized straw fiber, 15 parts of black phosphorus powder, and 10 parts of diethyl succinate. Among them, the semi-carbonized straw fiber is obtained by pyrolyzing straw under anaerobic conditions. Specifically, it is prepared by the following method: After washing the straw, it is added to a nitric acid aqueous solution with a mass concentration of 60 wt% and soaked for 10 h for pretreatment. During the soaking process, the straw is stirred every 2.0 h. After the pretreatment is completed, the straw is crushed to obtain short straw material, and then the short straw material is added to a pyrolysis device and pyrolyzed under anaerobic conditions at a temperature of 330 °C. After the pyrolysis is completed and cooled, the semi-carbonized straw fiber is collected. The tourmaline powder therein is composed of magnesium tourmaline powder, iron tourmaline powder, and chromium tourmaline powder in a mass ratio of 4.0:2.5:1.7. The straw is wheat straw.

[0049] The preparation method of the above-mentioned high-strength rod-shaped porcelain insulator comprises the following steps:

[0050] S1. Weigh bauxite, feldspar powder, mullite powder, alumina powder, silica fine powder, boron nitride powder, tourmaline powder, semi-carbonized straw fiber, black phosphorus powder, and diethyl succinate according to parts by weight, mix them, and perform wet ball milling in a ball mill to form a slurry;

[0051] S2. Pour the slurry into a mold and form a blank of the rod-shaped porcelain insulator through a pressing process. Among them, the forming pressure is 100 MPa and the forming time is 15 min.

[0052] S3. Immerse the blank in the glaze melt for 60 s. After glazing, put the blank into a gas kiln and sinter it at 1400 °C for 12 h. After sintering is completed, the rod-shaped porcelain insulator is obtained through natural cooling.

[0053] Comparative Example 1

[0054] This comparative example is compared with Example 3. The difference is that an equal amount of boron nitride powder is used to replace tourmaline powder.

[0055] Comparative Example 2

[0056] This comparative example is compared with Example 3. The difference is that an equal amount of tourmaline powder is used to replace boron nitride powder.

[0057] Comparative Example 3

[0058] This comparative example is compared with Example 3. The difference is that an equal weight of wheat straw fiber is used to replace semi-carbonized straw fiber.

[0059] Comparative Example 4

[0060] This comparative example is compared with Example 3. The difference is that the raw materials do not contain black phosphorus powder.

[0061] Performance testing

[0062] Refer to the requirements of GB / T 4741-1999 to test the flexural strength of the test specimens prepared by the methods described in the above examples and comparative examples. The loading rate is set at 20 N / s; use an impulse voltage generator to simulate the lightning strike effect to test the breakdown voltage of the test specimens prepared by the methods described in the above examples and comparative examples; subject each group of test specimens to 30 cycles of repeated freezing and thawing at -50°C to 40°C. First, place the specimens in a constant temperature box at -50°C and let them stand for 20 min, then take them out and let them stand in the air for 10 min. Subsequently, place the specimens in a constant temperature box at 40°C and let them stand for 20 min. After standing, take them out and let them stand in the air for 10 min, which completes one cycle of freezing and thawing. After 30 cycles of freezing and thawing, observe whether there are cracks on the surface of the specimens. The results are shown in Table 1.

[0063] Flexural strength / N Impulse voltage / kV Whether there are cracks after 30 freeze-thaw cycles Example 1 525 175 No cracks Example 2 527 174 No cracks Example 3 533 180 No cracks Example 4 526 175 No cracks Example 5 528 173 No cracks Comparative example 1 263 116 A small amount of cracks Comparative example 2 272 127 A small amount of cracks Comparative example 3 413 131 A small amount of cracks Comparative example 4 315 128 A small amount of cracks

[0064] The flexural strength of the porcelain insulators in Examples 1-5 ranges from 525 to 533 MPa, which is much higher than the 180-200 MPa required for traditional insulators, and the breakdown voltage is also relatively high, remaining at 173-180 kV. This is mainly attributed to the synergistic effect of semi-carbonized straw fiber, black phosphorus powder, tourmaline powder, and boron nitride powder. The semi-carbonized straw fiber enhances the adhesion and toughness between the raw materials. The black phosphorus powder can promote the densification of ceramic raw materials during the sintering process, thereby increasing the density and strength of the product. The tourmaline powder and boron nitride powder improve the overall strength and stability of the insulator through the filling effect and their own high hardness and wear resistance.

[0065] After replacing tourmaline powder with boron nitride powder in Comparative Example 1, both the flexural strength and the breakdown voltage decreased significantly. This indicates that the piezoelectric effect and filling effect of tourmaline powder make important contributions to the performance of the insulator, and boron nitride powder alone cannot completely replace it.

[0066] After completely replacing boron nitride powder with tourmaline powder in Comparative Example 2, the performance also decreased, but the decrease was smaller than that in Comparative Example 1. This shows that the high hardness and chemical stability of boron nitride powder also have a positive impact on the performance of the insulator, but the role of tourmaline powder is more critical.

[0067] Examples 1-5 all showed excellent freeze-thaw resistance, and no cracks were generated. This benefits from the flexibility and toughening effect of semi-carbonized straw fiber, as well as the high densification and uniformity of the overall material.

[0068] A small number of cracks appeared in Comparative Examples 1-2, indicating that the synergistic effect of tourmaline powder and boron nitride powder is crucial for improving the freeze-thaw resistance of the insulator.

[0069] In Examples 1-5, the performance of the insulators using semi-carbonized straw fibers is significantly better than that of Comparative Example 3. This is mainly because the organic components in the straw are partially carbonized through treatment, which not only retains the fiber morphology of part of the straw but also endows it with new physical and chemical properties. The semi-carbonization treatment significantly improves the flexibility, adhesiveness, and thermal stability of the straw fibers, thus enhancing the overall performance of the insulators. Although the wheat straw fibers in Comparative Example 3 also have a certain strengthening effect, there is still a large gap in performance compared with the semi-carbonized straw fibers.

[0070] Examples 1-5 are superior to Comparative Example 4 in terms of flexural strength, breakdown voltage, and freeze-thaw resistance. This is because the black phosphorus powder can form an effective reinforcing phase. When the insulator is subjected to bending stress, the black phosphorus powder particles can effectively bear part of the stress, thereby delaying the crack propagation and improving the flexural strength of the porcelain insulator. In the insulator, the addition of black phosphorus powder can increase the thickness and uniformity of the electrical insulation layer of the insulator, thus improving the breakdown voltage of the insulator. When the insulator is subjected to high voltage, the black phosphorus powder particles can form barriers to prevent the current from breaking through the inside of the porcelain insulator. In addition, the addition of black phosphorus powder can improve the microstructure of the insulator, increasing the porosity and specific surface area inside the insulator. These pores and specific surface areas are beneficial to the penetration and discharge of water molecules. When the insulator is subjected to freeze-thaw cycles, the black phosphorus powder particles can absorb and release water molecules, thereby reducing the damage caused to the insulator by the expansion and contraction of water. At the same time, the black phosphorus powder has good thermal stability and is not prone to phase change or decomposition due to temperature changes. In the insulator, the addition of black phosphorus powder can improve the overall thermal stability of the insulator, enabling it to maintain good performance under extreme temperature conditions.

[0071] The above are only the 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 principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A high-strength rod-shaped porcelain insulator, characterized in that: The invention comprises the following raw materials in parts by weight: 50-70 parts of alumina, 20-30 parts of feldspar powder, 10-20 parts of mullite powder, 20-40 parts of alumina powder, 5-20 parts of silicon dioxide powder, 5-15 parts of boron nitride powder, 10-20 parts of tourmaline powder, 5-10 parts of semi-carbonized straw fiber, 5-15 parts of black phosphorus powder, and 5-10 parts of diethyl succinate; The semi-carbonized straw fiber is obtained by pyrolyzing the straw under anaerobic conditions, and the semi-carbonized straw fiber is obtained by the following method: washing the straw and then pre-treating the straw, the pre-treating method of the straw being: adding the straw into a nitric acid aqueous solution and soaking it for 10-12 hours, and turning the straw over every 2.0-2.5 hours during the soaking process; after the pre-treatment is completed, the straw is crushed to obtain short straw material, and then the short straw material is added into a pyrolysis device, and pyrolyzed under anaerobic conditions, and after the pyrolysis is completed, it is cooled and collected to obtain the semi-carbonized straw fiber; The tourmaline powder is composed of magnesium tourmaline powder, iron tourmaline powder and chromium tourmaline powder in a mass ratio of (2.0-4.0):(1.0-2.5):(0.5-1.7).

2. A high-strength rod-shaped porcelain insulator as claimed in claim 1, characterized in that: The pyrolysis temperature is 325-330°C.

3. A high-strength rod-shaped porcelain insulator as claimed in claim 1, characterized in that: The mass concentration of the nitric acid aqueous solution is 50-60wt%.

4. A high-strength rod-shaped porcelain insulator as claimed in claim 1, characterized in that: The straw is one of wheat straw, corn straw, sesame straw and rice straw.

5. The method for preparing a high-strength rod-shaped porcelain insulator according to claim 1, characterized in that: The following steps are involved: S1. Weigh alumina, feldspar powder, mullite powder, alumina powder, silica powder, boron nitride powder, tourmaline powder, semi-carbonized straw fiber, black phosphorus powder and diethyl succinate in parts by weight, mix them, add water and grind them in a ball mill to form a slurry; S2, pouring the slurry into a mold, and forming a blank of a rod-shaped porcelain insulator through a pressing molding process; S3, immerse the blank into the glaze melt for 30-60s, put the blank into a gas-fired kiln for sintering after glazing, and after sintering, obtain a rod-shaped porcelain insulator through natural cooling.

6. The method for preparing a high-strength rod-shaped porcelain insulator according to claim 5, characterized in that: The pressing process in S2 has a molding pressure of 50-100 MPa and a molding time of 15-25 min.

7. The method for preparing a high-strength rod-shaped porcelain insulator according to claim 5, characterized in that: In the S3, the sintering temperature is 1200-1400° C. and the sintering time is 12-18 hours.