A rod-shaped post porcelain insulator and a preparation method and application thereof

Abstract

The present application relates to a kind of stick-shaped support porcelain insulator and its preparation method and application, belong to insulator technical field.The insulator is composed of insulator white blank and surface no-baking porcelain-imitating layer, no-baking porcelain-imitating layer is with thermosetting acrylic resin as film-forming base material, by the self-developed modified self-floating filler compound closed isocyanate Give no-baking porcelain-imitating layer surface good stain resistance and wear resistance;Modified self-floating filler is with small particle size hollow glass microsphere as carrier, fluorine structure is introduced in surface modification modification, low temperature leveling, under the action of buoyancy, to the surface of umbrella skirt, form a large number of fluorine element-rich micro convex in surface layer, so that surface has good stain resistance, in the process of rainfall, impure rainwater is not easy to infiltrate insulator surface, so that the dust carried is not gathered on the surface to form flashover, and surface hardening, give surface good wear resistance, not easy to scratch in production and construction process to cause surface stain.

Description

Technical Field

[0001] This invention belongs to the field of insulator technology, specifically relating to a rod-shaped post porcelain insulator, its preparation method, and its application. Background Technology

[0002] Post insulators are special insulating components that play a crucial role in overhead transmission lines. They are designed to increase creepage distance and are typically made of silicone or ceramic. However, in ultra-high voltage (UHV) transmission networks, to ensure sufficient creepage distance, the insulators are larger, and ceramic insulators are generally used.

[0003] Flashover refers to the phenomenon of discharge along the surface of a solid insulator when the gas or liquid dielectric around it breaks down. It is especially prone to occur during lightning strikes. In ultra-high voltage transmission networks, the replacement of insulators is difficult and has a high risk factor. The main cause of flashover is that impurities adhere to the surface of the insulator. When it is damp, the impurities on the surface and water form a contamination layer, which significantly reduces the flashover voltage. In traditional techniques, glazing is applied to the surface of insulators to prevent contamination and flashover. The high smoothness of the glaze reduces the amount of contamination. However, the firing of the glaze consumes a lot of energy, and the glaze is brittle. Insulators in ultra-high voltage transmission networks are large and heavy, making them prone to surface damage during construction. In addition, the firing quality of the glaze is difficult to guarantee, posing a significant safety risk. With the advancement of science and technology, polymers are often used to replace traditional glaze materials for protection, such as fluoropolymers, silicone resins, and their modified resins. These polymer protective materials generally have low hardness and their surface abrasion resistance is far lower than that of glazes, making them easy to scratch and accumulate contaminants. Fluoropolymer protective layers have good hydrophobicity, but fluorinated modified resins are expensive, increasing the construction cost of transmission networks for insulators that require large-area recoating. Summary of the Invention

[0004] In order to solve the technical problems mentioned in the background art, the purpose of this invention is to provide a rod-shaped post porcelain insulator, its preparation method and application.

[0005] The objective of this invention can be achieved through the following technical solutions:

[0006] A rod-shaped post porcelain insulator comprises an insulator blank and a surface-mounted, non-fired imitation porcelain layer, wherein the non-fired imitation porcelain layer is formed by baking and curing a protective slurry, and comprises, by weight:

[0007] The product contains 100 parts thermosetting acrylic resin, 18-24 parts modified self-floating filler, 4.6-5.5 parts blocked isocyanate curing agent, 0.12-0.15 parts light stabilizer, 0.3-0.4 parts leveling agent, 0.25-0.35 parts defoamer, and 10-13 parts diluent.

[0008] The modified self-floating packing is prepared by the following method:

[0009] Step A1: Mix ethyl methacrylate, diethanolamine and anhydrous acetone, adjust the temperature in an ice-water bath to 0-10℃, stir and add sodium hydride intermittently, control the total reaction time to 2.5-3.5h, then raise the temperature to 40-50℃ and continue stirring for 1.2-1.5h. After the reaction is complete, remove acetone under vacuum, wash the substrate with water, remove the aqueous phase and dry under vacuum to obtain the intermediate;

[0010] Furthermore, the ratio of ethyl methacrylate, diethanolamine, sodium hydride, and anhydrous acetone is 0.1 mol: 0.102-0.105 mol: 0.12-0.18 g: 35-50 mL. Under the promotion of sodium hydride, ethyl methacrylate and diethanolamine undergo amine-ester exchange to form a tertiary amine compound containing a terminal hydroxyl acrylate structure.

[0011] Step A2: Mix silane coupling agent KH580 and ethanol solution, add acetic acid to acidify to pH 3.5-4.5, stir and hydrolyze for 0.5-0.8 h, then add ultra-fine hollow glass microspheres and sonicate, add ammonia water to neutralize, let stand for 24 h, remove the liquid phase and dry to obtain thiolized carrier;

[0012] Furthermore, the ratio of ultra-micro hollow glass microspheres, silane coupling agent KH580, and ethanol solution is 50g:5.5-7mL:100-140mL. The silane coupling agent KH580 is hydrolyzed under organic weak acid and coupled with the ultra-micro hollow glass microspheres, introducing active thiol groups onto the surface of the ultra-micro hollow glass microspheres.

[0013] Preferably, the D90 particle size of the ultra-micro hollow glass microspheres is 10-20 μm. Under this condition, they are easy to disperse in the slurry under stirring and have a certain floating ability in the slurry when left to stand.

[0014] Step A3: Sonicate the thiolized support, intermediate, dimethylphenylphosphine, and ethyl acetate, and heat to 45-55℃, supplemented with 300-400W / m 2 The mixture was irradiated with ultraviolet light and stirred for 2.2-2.8 hours. After the reaction was completed, the mixture was allowed to stand and separate into layers. The liquid phase was removed and the mixture was dried to obtain the modified support.

[0015] Furthermore, the ratio of mercaptomodified support, intermediate, dimethylphenylphosphine, and ethyl acetate is 50g:2.8-3.6g:15-20mg:60-80mL. Under UV irradiation, the unsaturated structure of the intermediate undergoes click addition with the mercaptomodified support, thereby loading the intermediate onto the surface of the mercaptomodified support.

[0016] Step A4: Mix the modified support, 3-(perfluorohexyl)propane oxide and dimethyl sulfoxide, pressurize with dry nitrogen to 1.5-2.5 bar, heat to 90-100℃ and react for 1.8-2.4 h. After the reaction is completed, vacuum dry and disperse to obtain the modified self-floating filler.

[0017] Furthermore, the ratio of modified support, 3-(perfluorohexyl)propane oxide, and dimethyl sulfoxide is 50g:8.5-11mL:40-50mL. The tertiary amine structure organic compound grafted on the surface of the modified support self-catalyzes the ring-opening of 3-(perfluorohexyl)propane oxide and the hydroxyl groups on the surface, introducing fluorine structures to modify the surface.

[0018] A method for preparing a rod-shaped post porcelain insulator includes the following steps:

[0019] Step S1: Premix the thermosetting acrylic resin, leveling agent, defoamer and diluent, then add the remaining raw materials and mix well to obtain the protective slurry;

[0020] Step S2: Remove dust from the surface of the insulator blank, spray with protective slurry, then bake and level, bake and cure in sequence, and after cooling, form a non-fired imitation porcelain layer on the surface to obtain a rod-shaped post porcelain insulator.

[0021] Furthermore, the baking and leveling temperature is 55-75℃, and the time is 0.5-0.7h.

[0022] Furthermore, the baking and curing are carried out in a tunnel oven, with the following process settings: Zone 1: 70-90℃, baking time: 10-15 min; Zone 2: 100-115℃, baking time: 15-20 min; Zone 3: 115-125℃, baking time: 8-12 min; Zone 4: 60-80℃, baking time: 10-15 min.

[0023] The beneficial effects of this invention are:

[0024] This invention discloses a non-fired porcelain-like layer for insulator protection. It uses thermosetting acrylic resin as the film-forming substrate and employs a self-developed modified self-floating filler combined with a closed-type isocyanate to impart excellent anti-fouling and wear-resistant properties to the non-fired porcelain-like layer surface, effectively reducing the risk of flashover due to pollution accumulation in insulators in 800kV UHV transmission networks. The modified self-floating filler uses small-diameter hollow glass microspheres as a carrier, with surface coupling modification using KH580. Active thiol groups are introduced onto the surface, and ethyl methacrylate undergoes amine-ester exchange with diethanolamine to form a tertiary amine compound containing a terminal hydroxyl acrylate structure, i.e., an intermediate. The unsaturated structure of this intermediate then undergoes click addition with the active thiol groups on the surface of the thiolized carrier, grafting the intermediate molecules onto the carrier surface. Subsequently, 3-(perfluorohexyl)propane oxide ring-opens with the hydroxyl groups on its surface under autocatalysis, introducing a fluorine structure to modify the surface. The modified self-floating filler… The acrylate structure introduced onto the material surface weakens the segregation effect of fluorine on the film-forming substrate, allowing it to be dispersed during blending. During low-temperature leveling, the hollow structure of the modified self-floating filler is enriched on the surface of the umbrella skirt under buoyancy, forming a large number of microscopic protrusions enriched with fluorine on the surface, giving the surface good anti-fouling properties. During rainfall, rainwater containing impurities is less likely to wet the insulator surface, preventing dust from accumulating on the surface and forming flashover. At the same time, the fluorine-containing modified self-floating filler is enriched on the surface of the non-fired imitation porcelain layer. Compared with traditional fluororesin, the introduction of the fluorine structure has less impact on the cohesion of the film-forming substrate and has little impact on the adhesion of the film-forming substrate. In addition, the modified self-floating filler enriched on the surface uses hollow glass microspheres as a carrier, which increases the surface hardness and gives the surface good wear resistance, making it less prone to scratches and surface contamination during production and construction. Detailed Implementation

[0025] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0026] Example 1: Preparation of rod-shaped post porcelain insulators, as detailed below:

[0027] 1) Preparation of modified self-floating packing

[0028] Step A1: Mix ethyl methacrylate, diethanolamine, and anhydrous acetone. Control the temperature in an ice-water bath at 10°C. Divide sodium hydride into three equal parts by mass and add them intermittently over 30 minutes. After complete addition, continue stirring at a constant temperature. Control the total reaction time for sodium hydride addition to 2.5 hours. Then, raise the temperature to 50°C and continue stirring for 1.2 hours. The ratio of ethyl methacrylate, diethanolamine, sodium hydride, and anhydrous acetone is 0.1 mol: 0.105 mol: 0.18 g: 50 mL. After the reaction is complete, remove acetone under vacuum, wash the substrate with water, remove the aqueous phase, and dry under vacuum to obtain the intermediate.

[0029] Step A2: Prepare a 50% (w / w) ethanol aqueous solution. Mix the silane coupling agent KH580 with the ethanol solution, add acetic acid to acidify to pH 3.5, stir and hydrolyze for 0.5 h, then add ultra-micro hollow glass microspheres. In this example, HM20 type raw material from Zhengzhou Shenglait Hollow Microsphere New Material Co., Ltd. is used, with a D90 of 20 μm. Disperse the microspheres by ultrasonic vibration at 25 kHz for 10 min, add ammonia water to neutralize, and let stand for 24 h. The ratio of ultra-micro hollow glass microspheres, silane coupling agent KH580 and ethanol solution is 50 g: 5.5 mL: 140 mL. Then remove the liquid phase and dry to obtain the thiolized carrier.

[0030] Step A3: Mix the thiolized support, intermediate, dimethylphenylphosphine, and ethyl acetate by ultrasonic vibration, heat to 55°C, and supplement with 400W / m 2 The mixture was subjected to ultraviolet irradiation and stirred for 2.2 h. The ratio of mercapto-support, intermediate, dimethylphenylphosphine and ethyl acetate was 50 g: 2.8 g: 15 mg: 80 mL. After the reaction was completed, the mixture was allowed to stand and separate into layers. The liquid phase was removed and dried to obtain the modified support.

[0031] Step A4: Mix the modified support, 3-(perfluorohexyl)propane oxide and dimethyl sulfoxide, pressurize with dry nitrogen to 2.5 bar, and heat to 100℃ for 1.8 h. The ratio of the modified support, 3-(perfluorohexyl)propane oxide and dimethyl sulfoxide is 50 g: 8.5 mL: 50 mL. After the reaction is completed, vacuum dry and disperse to obtain the modified self-floating packing.

[0032] 2) Manufacturing rod-shaped post porcelain insulators

[0033] Step S1: Raw materials were prepared according to the following weight proportions: 100 parts of thermosetting acrylic resin (AC1101A product from Nengda Chemical (Heshan) Co., Ltd. was used throughout the process); 24 parts of modified self-floating filler (self-made in this embodiment); 4.6 parts of blocked isocyanate curing agent (JX-615 product from Dongguan Jiangxing Industrial Co., Ltd. was used throughout the process); 0.12 parts of light stabilizer (industrial grade light stabilizer 770 was used throughout the process); 0.4 parts of leveling agent (BYK-381 product from BYK Chemicals was used throughout the process); 0.35 parts of defoamer (Airex920 product from DIGIC was used throughout the process); and 13 parts of diluent (industrial grade rosin was used throughout the process).

[0034] The thermosetting acrylic resin, leveling agent, defoamer and diluent were premixed at 40 rpm for 10 min, and then the remaining raw materials were added. The stirring speed was increased to 120 rpm and stirred for 20 min to obtain the protective slurry.

[0035] Step S2: The surface of the insulator blank is dusted with compressed air, coated with protective slurry, and then transferred to an oven for drying and leveling. The temperature is controlled at 75℃ for 0.5 hours. After that, it is transferred to a tunnel oven for drying and curing. The oven process settings are as follows: Zone 1: 90℃, drying time: 10 minutes; Zone 2: 115℃, drying time: 15 minutes; Zone 3: 125℃, drying time: 8 minutes; Zone 4: 80℃, drying time: 10 minutes. After cooling, a non-fired imitation porcelain layer is formed on the surface, resulting in a rod-shaped post porcelain insulator.

[0036] Example 2: Preparation of rod-shaped post porcelain insulators, as detailed below:

[0037] 1) Preparation of modified self-floating packing

[0038] Step A1: Mix ethyl methacrylate, diethanolamine, and anhydrous acetone. Control the temperature in an ice-water bath to 5°C. Divide sodium hydride into three equal parts by mass and add them intermittently over 30 minutes. After complete addition, continue stirring at a constant temperature. Control the total reaction time for sodium hydride addition to 3.2 hours. Then, raise the temperature to 45°C and continue stirring for 1.4 hours. The ratio of ethyl methacrylate, diethanolamine, sodium hydride, and anhydrous acetone is 0.1 mol: 0.104 mol: 0.15 g: 45 mL. After the reaction is complete, remove acetone under vacuum, wash the substrate with water, remove the aqueous phase, and dry under vacuum to obtain the intermediate.

[0039] Step A2: Prepare a 50% (w / w) ethanol aqueous solution. Mix the silane coupling agent KH580 with the ethanol solution, add acetic acid to acidify to pH 4, and stir for 0.7 h to hydrolyze. Then add ultra-micro hollow glass microspheres. In this example, HM15 type raw material from Zhengzhou Shenglait Hollow Microsphere New Material Co., Ltd. is used, with a D90 of 15 μm. Disperse the microspheres by ultrasonic vibration at 28 kHz for 10 min, add ammonia water to neutralize, and let stand for 24 h. The ratio of ultra-micro hollow glass microspheres, silane coupling agent KH580 and ethanol solution is 50 g: 6.5 mL: 120 mL. Then remove the liquid phase and dry to obtain the thiolized carrier.

[0040] Step A3: Mix the thiolized support, intermediate, dimethylphenylphosphine, and ethyl acetate by ultrasonic vibration, heat to 50°C, and supplement with 360W / m 2 The mixture was subjected to ultraviolet irradiation and stirred for 2.5 h. The ratio of mercapto-support, intermediate, dimethylphenylphosphine and ethyl acetate was 50 g: 3.2 g: 18 mg: 70 mL. After the reaction was completed, the mixture was allowed to stand and separate into layers. The liquid phase was removed and dried to obtain the modified support.

[0041] Step A4: Mix the modified support, 3-(perfluorohexyl)propane oxide and dimethyl sulfoxide, pressurize with dry nitrogen to 2 bar, and heat to 92℃ for 2.2 h. The ratio of the modified support, 3-(perfluorohexyl)propane oxide and dimethyl sulfoxide is 50 g: 10 mL: 45 mL. After the reaction is completed, vacuum dry and disperse to obtain the modified self-floating filler.

[0042] 2) Manufacturing rod-shaped post porcelain insulators

[0043] Step S1: According to the weight parts, the raw materials are as follows: 100 parts of thermosetting acrylic resin; 22 parts of modified self-floating filler (made in this embodiment); 5.2 parts of blocked isocyanate curing agent; 0.15 parts of light stabilizer; 0.4 parts of leveling agent; 0.25 parts of defoamer; and 11 parts of diluent.

[0044] The thermosetting acrylic resin, leveling agent, defoamer and diluent were premixed at 40 rpm for 10 min, and then the remaining raw materials were added. The stirring speed was increased to 120 rpm and stirred for 20 min to obtain the protective slurry.

[0045] Step S2: The surface of the insulator blank is dusted with compressed air, coated with protective slurry, and then transferred to an oven for drying and leveling. The temperature is controlled at 65℃ for 0.6 hours. After that, it is transferred to a tunnel oven for drying and curing. The oven process settings are as follows: Zone 1: 75℃, drying time: 15 minutes; Zone 2: 110℃, drying time: 18 minutes; Zone 3: 120℃, drying time: 10 minutes; Zone 4: 65℃, drying time: 15 minutes. After cooling, a non-fired imitation porcelain layer is formed on the surface, resulting in a rod-shaped post porcelain insulator.

[0046] Example 3: Preparation of rod-shaped post porcelain insulators, as detailed below:

[0047] 1) Preparation of modified self-floating packing

[0048] Step A1: Mix ethyl methacrylate, diethanolamine, and anhydrous acetone. Control the temperature to 0°C using an ice-water bath. Divide sodium hydride into three equal parts by mass and add them intermittently over 30 minutes. After complete addition, continue stirring at a constant temperature. Control the total reaction time for sodium hydride addition to 3.5 hours. Then, raise the temperature to 40°C and continue stirring for 1.5 hours. The ratio of ethyl methacrylate, diethanolamine, sodium hydride, and anhydrous acetone is 0.1 mol: 0.102 mol: 0.12 g: 35 mL. After the reaction is complete, remove acetone under vacuum, wash the substrate with water, remove the aqueous phase, and dry under vacuum to obtain the intermediate.

[0049] Step A2: Prepare a 50% (w / w) ethanol aqueous solution. Mix the silane coupling agent KH580 with the ethanol solution, add acetic acid to acidify to pH 4.5, stir and hydrolyze for 0.8 h, then add ultra-micro hollow glass microspheres. In this example, HM10 type raw material from Zhengzhou Shenglait Hollow Microsphere New Material Co., Ltd. is used, with a D90 of 10 μm. Disperse the microspheres by ultrasonic vibration at 28 kHz for 10 min, add ammonia water to neutralize, and let stand for 24 h. The ratio of ultra-micro hollow glass microspheres, silane coupling agent KH580 and ethanol solution is 50 g: 7 mL: 100 mL. Then remove the liquid phase and dry to obtain the thiolized carrier.

[0050] Step A3: Mix the thiolized support, intermediate, dimethylphenylphosphine, and ethyl acetate by ultrasonic vibration, heat to 45°C, and supplement with 300W / m 2 The mixture was irradiated with ultraviolet light and stirred for 2.8 h. The ratio of mercapto-support, intermediate, dimethylphenylphosphine and ethyl acetate was 50 g: 3.6 g: 20 mg: 60 mL. After the reaction was completed, the mixture was allowed to stand and separate into layers. The liquid phase was removed and dried to obtain the modified support.

[0051] Step A4: Mix the modified support, 3-(perfluorohexyl)propane oxide and dimethyl sulfoxide, pressurize with dry nitrogen to 1.5 bar, and heat to 90℃ for 2.4 h. The ratio of the modified support, 3-(perfluorohexyl)propane oxide and dimethyl sulfoxide is 50 g: 11 mL: 40 mL. After the reaction is completed, vacuum dry and disperse to obtain the modified self-floating filler.

[0052] 2) Manufacturing rod-shaped post porcelain insulators

[0053] Step S1: According to the weight parts, the raw materials are as follows: 100 parts of thermosetting acrylic resin; 18 parts of modified self-floating filler (made in this embodiment); 5.5 parts of blocked isocyanate curing agent; 0.13 parts of light stabilizer; 0.3 parts of leveling agent; 0.32 parts of defoamer; and 10 parts of diluent.

[0054] The thermosetting acrylic resin, leveling agent, defoamer and diluent were premixed at 40 rpm for 10 min, and then the remaining raw materials were added. The stirring speed was increased to 120 rpm and stirred for 20 min to obtain the protective slurry.

[0055] Step S2: The surface of the insulator blank is dusted with compressed air, coated with protective slurry, and then transferred to an oven for drying and leveling. The temperature is controlled at 55℃ for 0.7 hours. After that, it is transferred to a tunnel oven for drying and curing. The oven process settings are as follows: Zone 1: 70℃, drying time: 15 minutes; Zone 2: 100℃, drying time: 20 minutes; Zone 3: 115℃, drying time: 12 minutes; Zone 4: 60℃, drying time: 15 minutes. After cooling, a non-fired imitation porcelain layer is formed on the surface, resulting in a rod-shaped post porcelain insulator.

[0056] In comparison, PRTV coating was used to protect the insulator blanks, as detailed below:

[0057] Take PRTV coating, specifically the PRTV (RTV-Ⅱ type) ultra-long-lasting anti-pollution flashover coating from Shandong Xinheli Electric Power Technology Co., Ltd., and spray it onto the surface of the insulator blank. After leveling for 30 minutes, place it in an oven and bake at 60℃ for 1 hour, then let it stand naturally for 24 hours to obtain a rod-shaped post porcelain insulator.

[0058] The rod-shaped porcelain insulators obtained above were subjected to surface water contact angle testing according to GB / T 24368-2009, surface hardness testing according to GB / T 6739-2022, surface abrasion testing according to GB / T1768-2006, and surface impact testing according to GB / T1732-2020. The specific test results are shown in Table 1.

[0059] Table 1

[0060] Contact angle / ° 114.9 120.5 118.3 102.7 Hardness / H 4 4 5 2 Wear amount / g 0.132 0.115 0.107 0.294 Impact strength / cm 50 50 50 50

[0061] As shown in Table 1, the insulators prepared in this embodiment have a contact angle of 114.9-120.5° for the non-fired porcelain-like layer, compared to 102.7° for the comparative example. This demonstrates excellent hydrophobic and anti-fouling properties, making the insulator surface less prone to flashover due to contamination. The hardness is 4-5H, and the wear amount is 0.107-0.132g, compared to 0.294g and 2H for the comparative examples. The non-fired porcelain-like layer exhibits superior strength and is less prone to scratches and surface contamination during production and construction. The impact resistance reaches 50cm, demonstrating good strength and toughness.

[0062] The rod-shaped post porcelain insulators obtained above were subjected to water resistance tests according to GB / T 5209-1985 standard, with test conditions of 25℃ for 168 hours; salt resistance tests according to GB / T 1765-1979 standard, with test conditions of 25℃, 5% NaCl for 72 hours; and acid and alkali resistance tests according to GB / T1763-1979 standard, with test conditions of 25℃, 2% H2SO4 for 24 hours and 25℃, 5% NaOH for 24 hours, respectively. The specific test results are shown in Table 2.

[0063] Table 2

[0064] Water resistance No visible changes No visible changes No visible changes No visible changes Salt resistance No visible changes No visible changes No visible changes No visible changes Acid resistance No visible changes No visible changes No visible changes No visible changes Alkali resistance No visible changes No visible changes No visible changes No visible changes

[0065] As can be seen from the test results in Table 2, the insulators obtained in the examples and comparative examples all have stable water resistance, salt resistance and acid and alkali resistance on their surface, and maintain stable protective function during service.

[0066] In the description of this specification, the references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0067] The above description is merely an example and illustration of the present invention. Those skilled in the art can make various modifications or additions to the specific embodiments described, or use similar methods to replace them, as long as they do not deviate from the invention or exceed the scope defined in the claims, all of which should fall within the protection scope of the present invention.

Claims

1. A rod-shaped post porcelain insulator, which is composed of an insulator white blank and a surface unfired porcelain-imitating layer, characterized in that, The non-fired imitation porcelain layer is formed by baking and curing a protective slurry, which comprises, by weight: The ingredients are: 100 parts thermosetting acrylic resin, 18-24 parts modified self-floating filler, 4.6-5.5 parts blocked isocyanate curing agent, 0.12-0.15 parts light stabilizer, 0.3-0.4 parts leveling agent, 0.25-0.35 parts defoamer, and 10-13 parts diluent. The modified self-floating packing is prepared by the following method: Step A1: Mix ethyl methacrylate, diethanolamine and anhydrous acetone, adjust the temperature in an ice-water bath to 0-10℃, stir and add sodium hydride intermittently, control the total reaction time to 2.5-3.5h, then raise the temperature to 40-50℃ and continue stirring for 1.2-1.5h. After the reaction is complete, remove acetone under vacuum, wash the substrate with water, remove the aqueous phase and dry under vacuum to obtain the intermediate; Step A2: Mix silane coupling agent KH580 and ethanol solution, add acetic acid to acidify to pH 3.5-4.5, stir and hydrolyze for 0.5-0.8 h, then add ultra-fine hollow glass microspheres and sonicate, add ammonia water to neutralize, let stand for 24 h, remove the liquid phase and dry to obtain thiolized carrier; Step A3: Sonicate the thiolized support, intermediate, dimethylphenylphosphine, and ethyl acetate, and heat to 45-55℃, supplemented with 300-400W / m 2 The mixture was irradiated with ultraviolet light and stirred for 2.2-2.8 hours. After the reaction was completed, the mixture was allowed to stand and separate into layers. The liquid phase was removed and the mixture was dried to obtain the modified support. Step A4: Mix the modified support, 3-(perfluorohexyl)propane oxide and dimethyl sulfoxide, pressurize with dry nitrogen to 1.5-2.5 bar, heat to 90-100℃ and react for 1.8-2.4 h. After the reaction is completed, vacuum dry and disperse to obtain the modified self-floating filler.

2. A rod-type post porcelain insulator according to claim 1, characterized in that The ratio of ethyl methacrylate, diethanolamine, sodium hydride and anhydrous acetone is 0.1 mol: 0.102-0.105 mol: 0.12-0.18 g: 35-50 mL.

3. A rod-type post porcelain insulator according to claim 2, characterized in that The ratio of ultrafine hollow glass microspheres, silane coupling agent KH580, and ethanol solution is 50g: 5.5-7mL: 100-140mL.

4. A rod-type post porcelain insulator according to claim 3, wherein The D90 particle size of the ultra-micro hollow glass microspheres is 10-20 μm.

5. A rod-type post porcelain insulator according to claim 4, wherein The ratio of mercapto-carrier, intermediate, dimethylphenylphosphine and ethyl acetate is 50g: 2.8-3.6g: 15-20mg: 60-80mL.

6. A rod-type post porcelain insulator according to claim 5, wherein The ratio of modified carrier, 3-(perfluorohexyl)propane oxide and dimethyl sulfoxide is 50g:8.5-11mL:40-50mL.

7. The method for preparing a rod-shaped post porcelain insulator according to claim 6, characterized in that, Includes the following steps: Step S1: Premix the thermosetting acrylic resin, leveling agent, defoamer and diluent, then add the remaining raw materials and mix well to obtain the protective slurry; Step S2: Remove dust from the surface of the insulator blank, spray with protective slurry, then bake and level, bake and cure in sequence, and after cooling, form a non-fired imitation porcelain layer on the surface to obtain a rod-shaped post porcelain insulator.

8. The method for preparing a rod-shaped post porcelain insulator according to claim 7, characterized in that, The leveling temperature is 55-75℃ for 0.5-0.7 hours. The curing process is carried out in a tunnel oven with the following settings: Zone 1: 70-90℃, baking time 10-15 minutes; Zone 2: 100-115℃, baking time 15-20 minutes; Zone 3: 115-125℃, baking time 8-12 minutes; Zone 4: 60-80℃, baking time 10-15 minutes.

9. An application of a rod-shaped post porcelain insulator as described in any one of claims 1-6 in an ultra-high voltage transmission network.