Cement-based electric porcelain adhesive for extra-high voltage insulator and preparation method of cement-based electric porcelain adhesive

Abstract

The invention relates to the technical field of cement-based adhesives, in particular to a cement-based electrical porcelain adhesive for an extra-high voltage insulator and a preparation method of the cement-based electrical porcelain adhesive for the extra-high voltage insulator. Early-stage and later-stage strength, salt corrosion resistance and toughness of the adhesive are improved by constructing a ternary synergistic effect of a quick-hardening mineral phase, a corrosion-resistant phase and a toughening phase; and a revolutionary cementing material with high hardness, high strength, corrosion resistance and toughness is provided for extreme environment power equipment such as extra-high voltage insulators, salt lake ocean wind power foundations and the like.

Description

Technical Field

[0001] This invention relates to the field of cement-based adhesives, and in particular to a cement-based electrical porcelain adhesive for ultra-high voltage insulators and its preparation method. Background Technology

[0002] As the global energy structure accelerates its transformation towards ultra-high voltage interconnection, smart grids, and the integration of new energy sources, porcelain insulators, as the core components of the "main artery" of power equipment, are facing challenges such as extreme mechanical performance (±1200kV insulators can bear a load of up to 8 tons) and a revolution in environmental adaptability (annual salinity density in salt lake areas exceeds 0.3 mg / cm³). 2 This represents a triple technological leap, encompassing [missing information - likely related to technology or technology], digital empowerment (built-in fiber optic sensors for real-time monitoring of 12 parameters), and therefore, higher performance requirements are placed on adhesives, a crucial component of insulators.

[0003] Traditional silicate cement-based adhesives suffer from drawbacks such as insufficient early strength (typically requiring 7 days of curing to reach a compressive strength of 83.5 MPa), high drying shrinkage (leading to interfacial microcracks), and poor salt resistance, severely restricting the reliability of insulators. Furthermore, the long setting time of silicate systems reduces insulator production efficiency. While using sulfoaluminate cement or high-alumina cement can effectively shorten setting time and improve production efficiency, the early strength is only around 50 MPa, with minimal increases in compressive strength at 3 days and 11 days, and a tendency for shrinkage (28-day strength retention rate <80%), failing to meet high-strength requirements. Amorphous calcium aluminate systems are costly and lack phase stability; traditional calcination processes struggle to achieve precise control of the aluminate mineral phase, further limiting the improvement of adhesive overall performance.

[0004] Existing technology CN104891905A discloses a cement-based insulator adhesive composed of silicate cement, mineral admixtures, and additives. Its 3-day compressive strength reaches 75 MPa, but its early strength is low, resulting in low production efficiency and poor resistance to salt corrosion. CN115180901A discloses an adhesive comprising silicate cement, quartz sand, cinder, carboxymethyl cellulose, rubber powder, slag, nano-silica, ethanol, and additives. It is also primarily silicate-based, exhibiting low early strength and poor resistance to salt corrosion. CN104446277A relates to a material for producing porcelain insulators, composed of the following components in parts by weight: sulfoaluminate cement, bound quartz sand, additives, silica fume, and glass fiber. Using sulfoaluminate cement as the main cementing material, its single composition, while improving early strength, leads to a tendency for later strength reduction and poor durability. Summary of the Invention

[0005] To address the problems existing in the prior art, this invention provides a cement-based electromagnetic adhesive for ultra-high voltage insulators. Specifically, this invention improves the early and late strength, salt erosion resistance, and toughness of the adhesive by constructing a ternary synergistic effect of "rapid-hardening mineral phase - corrosion-resistant phase - toughening phase". This solves the problems of low early strength, poor salt resistance, late shrinkage of single aluminate cement, high cost and insufficient phase stability of amorphous calcium aluminate. It provides a revolutionary bonding material with rapid hardening, high strength, corrosion resistance and toughness for power equipment in extreme environments such as ultra-high voltage insulators, salt lake and marine wind power foundations.

[0006] Specifically, the cement-based porcelain adhesive for ultra-high voltage insulators of this invention is composed of the following raw materials in parts by weight: high C 12 45-50 parts of A7 high-alumina clinker, 25-30 parts of high-ferrous sulfoaluminate cement, 5-15 parts of silicate cement, 3-5 parts of gypsum, 5-10 parts of ultrafine admixture, 40-55 parts of quartz sand, 0.02-0.1 parts of early-strength agent, 0.1-0.3 parts of water-reducing agent, 3-5 parts of retarder, 0.1-0.2 parts of hydrophobic component, 0.2-0.6 parts of anti-carbonation component, and 0.1-0.3 parts of toughening fiber.

[0007] The hydrophobic component is silane coupling agent modified nano-silica, preferably, the silane coupling agent is KH570.

[0008] The preparation process of the anti-carbonization component is as follows: magnesite is finely ground and water is added to prepare an absorbent solution; industrial waste gas containing sulfur dioxide is introduced; the solid content is adjusted to 40-55%; dilute sulfuric acid is added to adjust the pH value to 5-5.5; and the slurry density is controlled to 1.4-1.6 kg / m³ by evaporation and concentration. 3 The mixture is slowly cooled, and 0.08-0.12% (by mass) of anhydrous sodium sulfate is added to induce crystallization. The crystals are then dried to obtain the final product. The main components of the anti-carbonation component of this invention are magnesium sulfate heptahydrate, magnesium sulfate monohydrate, anhydrous magnesium sulfate, and a small amount of impurities. More preferably, the main components are 35-45% magnesium sulfate heptahydrate, 33-45% magnesium sulfate monohydrate, 10-12% anhydrous magnesium sulfate, and ≤3% impurities.

[0009] Preferably, the sulfur dioxide-containing industrial waste gas is at least one of cement kiln waste gas, thermal power plant waste gas, or heavy oil combustion furnace waste gas.

[0010] Preferably, the high C 12 A7 content high-alumina clinker contains C 12 The A7 content is 18-24%. More preferably, the high C content... 12 In high-alumina clinker with A7 content, the CA content is 25-38%, the C3A content is 35-44%, and the C content is... 12The A7 content is 18-24%, the C2S content is 5-8%, the content of other components is no more than 5%, and the density is 2.95-3.10 g / cm³. 3 .

[0011] Preferably, the high C 12 A7 high-alumina clinker was prepared through raw material pretreatment, ion doping, gradient sintering, and post-treatment.

[0012] More preferably, the high C 12 The preparation process of A7 high-alumina clinker is as follows: 70-80 parts of high-alumina fly ash, 15-20 parts of limestone, 3-5 parts of calcium sulfate whiskers, and 2-3 parts of CaF2 are ball-milled. Then, 3-5 parts of MnO2, 1-2 parts of ZnO, and 0.5-1 parts of B2O3 are added and mixed evenly. The mixture is then activated at a low temperature of 600-800℃ for 0.5-1.5 hours, crystallized at a medium temperature of 900-1100℃ for 1-1.5 hours, and calcined at a high temperature of 1250-1300℃ for 1-2 hours. After rapid cooling, the mixture is ground finely to obtain the final product. In this preparation process, calcium sulfate whiskers can assist in pore formation, and CaF2 acts as a mineralizer; both promote the calcination process.

[0013] Preferably, the high-speed ferroaluminate cement contains 55-75% C4A3, 15-30% C2S, and 15-30% iron phase. More preferably, the high-speed ferroaluminate cement has a specific surface area of ​​350-400 m². 2 / kg.

[0014] Preferably, the silicate cement has a strength grade ≥ 52.5. More preferably, the silicate cement has a specific surface area of ​​320-350 m². 2 / kg.

[0015] Preferably, the ultrafine admixture is at least one of silica fume and ultrafine mineral powder. More preferably, the ultrafine admixture is a mixture of silica fume and ultrafine mineral powder in a mass ratio of (5-8):(8-12).

[0016] Preferably, the quartz sand is composed of 10-20 mesh continuously graded quartz sand and 20-40 mesh continuously graded quartz sand in a weight ratio of (0.5-1.5):(0.5-1.5).

[0017] Preferably, the hydrophobic component has a particle size of 5-20 nm and / or a specific surface area ≥200 m². 2 / g.

[0018] Preferably, the early strength agent is lithium carbonate.

[0019] Preferably, the water-reducing agent is a polycarboxylate water-reducing agent.

[0020] Preferably, the retarder is L-tartaric acid.

[0021] Preferably, the toughening fiber is at least one of polypropylene fiber and basalt fiber. More preferably, the toughening fiber is a mixture of polypropylene fiber and basalt fiber in a mass ratio of (5-6):(4-5). Even more preferably, the toughening fiber has a length of 3-6 mm and a diameter of 20-200 μm.

[0022] This invention also relates to a method for preparing the above-mentioned cement-based electrical porcelain adhesive for ultra-high voltage insulators, specifically comprising the following steps: 1) Weigh each ingredient according to its weight. 2) Mix all the ingredients evenly to obtain the final product.

[0023] The present invention also relates to the application of the above-mentioned cement-based porcelain adhesive for ultra-high voltage insulators in the insulator preparation process. Preferably, the adhesive is mixed with water at a water-to-material ratio of 0.22-0.25:1, allowed to stand to allow air bubbles to escape, and then formed.

[0024] This invention has the following technical advantages: 1. Controllable setting time, high early strength, and no strength reduction in later stages. A rapid-hardening mineral phase is formed by combining self-prepared high-activity high-alumina clinker with high-ferrous sulfoaluminate cement. Upon contact with water, this phase rapidly dissociates and participates in the hydration reaction. Calcium hydroxide in the silicate cement activates the activity of the high-alumina clinker, and its hydration products, ettringite and aluminum hydroxide, rapidly fill pores, forming a dense structure and significantly improving early strength. The silicate hydration reaction generates more CSH gel, enhancing density and later strength. Combined with the pore control and activity activation of ultrafine admixtures, the 1-day compressive strength reaches over 80 MPa, and the 11-day compressive strength is ≥100 MPa. 2. Excellent resistance to salt erosion and carbonation. A hydrophobic barrier is constructed by modifying nano-silica with a silane coupling agent, achieving a breakthrough in salt erosion resistance. Calcium aluminoferrite in the high-ferric sulfoaluminate cement reacts with gypsum to form ettringite, simultaneously releasing Fe... 3+ Ferric hydroxide colloid forms a dense protective layer covering the pore surface. This layer effectively blocks the contact between sulfate and CSH, inhibits the secondary formation of the expansive product ettringite, prevents structural cracking, and improves salt corrosion resistance. The alkalinity of the system is increased by compounding cementitious materials; and the addition of anti-carbonation components, aided by Mg... 2+ It can generate layered bimetallic hydroxides and relatively strong CO3. 2- It has affinity, consumes intruding CO2, and achieves a dual effect of physical filling and chemical carbon fixation, resulting in excellent anti-carbonization performance. 3. Significantly improved toughness. The use of fibers, especially the blend of polypropylene and basalt fibers, significantly enhances the toughness of the matrix while optimizing the interfacial bonding strength, ultimately forming an electrical porcelain adhesive that combines high strength, high corrosion resistance, and high toughness. Detailed Implementation

[0025] To characterize the technical effects of this invention, an adhesive was prepared and its performance was tested. During the experiment, the silicate cement was P·I 52.5 cement, the ultrafine admixture was a mixture of silica fume and ultrafine mineral powder in a mass ratio of 6:10, the quartz sand consisted of 10-20 mesh continuously graded quartz sand and 20-40 mesh continuously graded quartz sand in a weight ratio of 1:1, the early-strength agent was lithium carbonate, the water-reducing agent was polycarboxylate superplasticizer, the retarder was L-tartaric acid, the hydrophobic component was KH570 modified nano-silica, and the anti-carbonation component was prepared by: grinding magnesite and adding water to prepare an absorbent liquid, introducing it into the cement kiln exhaust gas, adjusting the solid content to 40%, adding dilute sulfuric acid to adjust the pH to 5, and evaporating and concentrating to control the slurry density to 1.6 kg / m³. 3 The slurry was slowly cooled and 0.1% anhydrous sodium sulfate was added to induce crystallization. The crystals were then dried to obtain the toughening fiber, which was a mixture of polypropylene fiber and basalt fiber in a mass ratio of 6:4.

[0026] Compressive and flexural strength tests: The adhesive was mixed and molded according to GB / T17671-2021 at a water-to-material ratio of 0.22, and then subjected to breakage tests after curing at 20℃ for 1 day, 3 days and 11 days.

[0027] Carbonation resistance test: According to GB / T 50082-2009, the specimens were 40mm×40mm×160mm cement mortar prisms molded with a water-to-material ratio of 0.22. After standard curing for 24 hours, the specimens were demolded. After curing for 28 days, the sides were sealed with paraffin wax, leaving only the top and bottom surfaces exposed (total exposed area approximately 40cm²). 2 The specimens were then placed in a carbonization chamber with a CO2 concentration of 20%±3%, a temperature of 20℃±2%, and a relative humidity of 70%±5% for accelerated carbonization. After 28 days, the specimens were removed, and 10mm thick slices were cut from the middle. Immediately after cutting, 1% phenolphthalein alcohol solution was sprayed onto the slices. After 30 seconds, the vertical distance from the interface between the uncarbonized area (pink) and the carbonized area (colorless) to the surface of the specimen was measured. The average of the three measurements was taken as the carbonization depth of the cross section.

[0028] Salt corrosion resistance test: Following ASTM C1556-19, the specimens used the same mortar formulation as the carbonization resistance test (water-to-material ratio 0.22, 40mm×40mm×160mm prism). After standard curing for 24 hours, the specimens were demolded and then cured for another 28 days. Three parallel specimen groups were selected: a control group (unimmersed, reference strength) and an experimental group (immersed in a 3.5% NaCl solution simulating a salt lake / marine environment). The test employed a continuous immersion method (direct immersion for 30 days, with periodic replacement of the solution). After the test, the specimens were removed, and the surface salt crystals were rinsed with clean water. They were then left to stand for 24 hours under standard curing conditions. Compressive / flexural strength was tested according to GB / T 17671-2021, and the strength retention rate was calculated (strength retention rate = strength after salt corrosion / reference strength × 100%).

[0029] Example 1 Adhesive, composed of the following raw materials in parts by weight: high C 12 The formula includes: 46 parts high-alumina clinker (A7 content), 30 parts high-ferrous sulfoaluminate cement, 13 parts silicate cement, 3 parts gypsum, 8 parts ultrafine admixture, 50 parts quartz sand, 0.05 parts early-strength agent, 0.3 parts water-reducing agent, 4 parts retarder, 0.2 parts hydrophobic component, 0.4 parts anti-carbonation component, and 0.2 parts toughening fiber.

[0030] High C 12 The preparation process of A7 high-alumina clinker is as follows: 80 parts of high-alumina fly ash, 16 parts of limestone, 4 parts of calcium sulfate whiskers, and 2 parts of CaF2 are ball-milled. 4 parts of MnO2, 1 part of ZnO, and 0.6 parts of B2O3 are added and mixed evenly. The mixture is activated at 700℃ for 1 hour, crystallized at 1000℃ for 1.5 hours, calcined at 1300℃ for 1.5 hours, rapidly cooled, and then ground to obtain the final product.

[0031] The specimen was tested and found to have a 1-day compressive strength of 81.2 MPa, a 1-day flexural strength of 12.3 MPa, a 3-day compressive strength of 91.1 MPa, a 3-day flexural strength of 14.4 MPa, an 11-day compressive strength of 102.3 MPa, an 11-day flexural strength of 16.3 MPa, a carbonization depth of 2.5 mm, a salt-eroded compressive strength retention rate of 90%, and a salt-eroded flexural strength retention rate of 85%.

[0032] Example 2 Adhesive, composed of the following raw materials in parts by weight: high C 12 50 parts A7 high-alumina clinker, 26 parts high-ferrous sulfoaluminate cement, 10 parts silicate cement, 4 parts gypsum, 9 parts ultrafine admixture, 49 parts quartz sand, 0.04 parts early-strength agent, 0.3 parts water-reducing agent, 3 parts retarder, 0.2 parts hydrophobic component, 0.5 parts anti-carbonation component, and 0.3 parts toughening fiber.

[0033] High C 12The preparation process of A7 high-alumina clinker is as follows: 78 parts of high-alumina fly ash, 17 parts of limestone, 5 parts of calcium sulfate whiskers, and 2.5 parts of CaF2 are ball-milled. 3 parts of MnO2, 1 part of ZnO, and 0.7 parts of B2O3 are added and mixed evenly. The mixture is activated at a low temperature of 760℃ for 1 hour, crystallized at a medium temperature of 1050℃ for 1.5 hours, calcined at a high temperature of 1280℃ for 1 hour, rapidly cooled, and ground to obtain the final product.

[0034] The specimen was tested and found to have a 1-day compressive strength of 85.4 MPa, a 1-day flexural strength of 13.1 MPa, a 3-day compressive strength of 94.3 MPa, a 3-day flexural strength of 14.6 MPa, an 11-day compressive strength of 105.6 MPa, an 11-day flexural strength of 16.8 MPa, a carbonization depth of 2.0 mm, a salt-eroded compressive strength retention rate of 92%, and a salt-eroded flexural strength retention rate of 88%.

[0035] Comparative Example 1 The adhesive is composed of the following raw materials in parts by weight: 86 parts silicate cement, 4 parts gypsum, 9 parts ultrafine admixture, 49 parts quartz sand, 0.04 parts early strength agent, 0.3 parts water-reducing agent, 3 parts retarder, 0.2 parts hydrophobic component, 0.5 parts anti-carbonation component, and 0.3 parts toughening fiber.

[0036] The specimen was tested and found to have a 1-day compressive strength of 48.5 MPa, a 1-day flexural strength of 6.2 MPa, a 3-day compressive strength of 63.2 MPa, a 3-day flexural strength of 10.1 MPa, an 11-day compressive strength of 85.5 MPa, an 11-day flexural strength of 10.3 MPa, a carbonization depth of 4.0 mm, a salt-eroded compressive strength retention rate of 60%, and a salt-eroded flexural strength retention rate of 55%.

[0037] Comparative Example 2 Adhesive, composed of the following raw materials in parts by weight: high C 12 50 parts A7 high-alumina clinker, 36 parts silicate cement, 4 parts gypsum, 9 parts ultrafine admixture, 49 parts quartz sand, 0.04 parts early-strength agent, 0.3 parts water-reducing agent, 3 parts retarder, 0.2 parts hydrophobic component, 0.5 parts anti-carbonation component, and 0.3 parts toughening fiber.

[0038] High C 12 The preparation process of A7 high-alumina clinker is as follows: 78 parts of high-alumina fly ash, 17 parts of limestone, 5 parts of calcium sulfate whiskers, and 2.5 parts of CaF2 are ball-milled. 3 parts of MnO2, 1 part of ZnO, and 0.7 parts of B2O3 are added and mixed evenly. The mixture is activated at a low temperature of 760℃ for 1 hour, crystallized at a medium temperature of 1050℃ for 1.5 hours, calcined at a high temperature of 1280℃ for 1 hour, rapidly cooled, and ground to obtain the final product.

[0039] The specimen was tested and found to have a 1-day compressive strength of 69.2 MPa, a 1-day flexural strength of 9.1 MPa, a 3-day compressive strength of 77.0 MPa, a 3-day flexural strength of 11.7 MPa, an 11-day compressive strength of 95.1 MPa, an 11-day flexural strength of 14.2 MPa, a carbonization depth of 3.1 mm, a salt-eroded compressive strength retention rate of 82%, and a salt-eroded flexural strength retention rate of 76%.

[0040] Comparative Example 3 The adhesive is composed of the following raw materials in parts by weight: 76 parts of high-speed ferroaluminate cement, 10 parts of silicate cement, 4 parts of gypsum, 9 parts of ultrafine admixture, 49 parts of quartz sand, 0.04 parts of early strength agent, 0.3 parts of water-reducing agent, 3 parts of retarder, 0.2 parts of hydrophobic component, 0.5 parts of anti-carbonation component, and 0.3 parts of toughening fiber.

[0041] The specimen was tested and found to have a 1-day compressive strength of 62.1 MPa, a 1-day flexural strength of 8.7 MPa, a 3-day compressive strength of 70.8 MPa, a 3-day flexural strength of 10.4 MPa, an 11-day compressive strength of 89.9 MPa, an 11-day flexural strength of 13.5 MPa, a carbonization depth of 2.9 mm, a salt-eroded compressive strength retention rate of 80%, and a salt-eroded flexural strength retention rate of 75%.

[0042] Comparative Example 4 Adhesive, composed of the following raw materials in parts by weight: high C 12 50 parts A7 high-alumina clinker, 26 parts high-ferrous sulfoaluminate cement, 10 parts silicate cement, 4 parts gypsum, 9 parts ultrafine admixture, 49 parts quartz sand, 0.04 parts early-strength agent, 0.3 parts water-reducing agent, 3 parts retarder, 0.5 parts anti-carbonation component, and 0.3 parts toughening fiber.

[0043] High C 12 The preparation process of A7 high-alumina clinker is as follows: 78 parts of high-alumina fly ash, 17 parts of limestone, 5 parts of calcium sulfate whiskers, and 2.5 parts of CaF2 are ball-milled. 3 parts of MnO2, 1 part of ZnO, and 0.7 parts of B2O3 are added and mixed evenly. The mixture is activated at a low temperature of 760℃ for 1 hour, crystallized at a medium temperature of 1050℃ for 1.5 hours, calcined at a high temperature of 1280℃ for 1 hour, rapidly cooled, and ground to obtain the final product.

[0044] The specimen was tested and found to have a 1-day compressive strength of 83.3 MPa, a 1-day flexural strength of 12.6 MPa, a 3-day compressive strength of 92.0 MPa, a 3-day flexural strength of 14.1 MPa, an 11-day compressive strength of 100.7 MPa, an 11-day flexural strength of 15.9 MPa, a carbonization depth of 2.5 mm, a salt-eroded compressive strength retention rate of 83%, and a salt-eroded flexural strength retention rate of 79%.

[0045] Comparative Example 5 Adhesive, composed of the following raw materials in parts by weight: high C 12 50 parts A7 high-alumina clinker, 26 parts high-ferrous sulfoaluminate cement, 10 parts silicate cement, 4 parts gypsum, 9 parts ultrafine admixture, 49 parts quartz sand, 0.04 parts early-strength agent, 0.3 parts water-reducing agent, 3 parts retarder, 0.2 parts hydrophobic component, and 0.3 parts toughening fiber.

[0046] High C 12 The preparation process of A7 high-alumina clinker is as follows: 78 parts of high-alumina fly ash, 17 parts of limestone, 5 parts of calcium sulfate whiskers, and 2.5 parts of CaF2 are ball-milled. 3 parts of MnO2, 1 part of ZnO, and 0.7 parts of B2O3 are added and mixed evenly. The mixture is activated at a low temperature of 760℃ for 1 hour, crystallized at a medium temperature of 1050℃ for 1.5 hours, calcined at a high temperature of 1280℃ for 1 hour, rapidly cooled, and ground to obtain the final product.

[0047] The specimen was tested and found to have a 1-day compressive strength of 80.8 MPa, a 1-day flexural strength of 12.1 MPa, a 3-day compressive strength of 90.4 MPa, a 3-day flexural strength of 13.5 MPa, an 11-day compressive strength of 99.6 MPa, an 11-day flexural strength of 15.8 MPa, a carbonization depth of 7.3 mm, a salt-eroded compressive strength retention rate of 88%, and a salt-eroded flexural strength retention rate of 82%.

[0048] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A cement-based porcelain adhesive for ultra-high voltage insulators, characterized in that, Composed of the following raw materials in parts by weight: High C 12 45-50 parts of A7 high-alumina clinker, 25-30 parts of high-ferrous sulfoaluminate cement, 5-15 parts of silicate cement, 3-5 parts of gypsum, 5-10 parts of ultrafine admixture, 40-55 parts of quartz sand, 0.02-0.1 parts of early-strength agent, 0.1-0.3 parts of water-reducing agent, 3-5 parts of retarder, 0.1-0.2 parts of hydrophobic component, 0.2-0.6 parts of anti-carbonation component, and 0.1-0.3 parts of toughening fiber. The hydrophobic component is silane coupling agent modified nano-silica. The preparation process of the anti-carbonization component is as follows: magnesite is finely ground and water is added to prepare an absorbent solution; industrial waste gas containing sulfur dioxide is introduced; the solid content is adjusted to 40-55%; dilute sulfuric acid is added to adjust the pH value to 5-5.5; and the slurry density is controlled to 1.4-1.6 kg / m³ by evaporation and concentration. 3 Slowly cool the slurry and add 0.08-0.12% anhydrous sodium sulfate by mass to induce crystallization. Dry the crystals to obtain the final product.

2. The cement-based porcelain adhesive for ultra-high voltage insulators according to claim 1, characterized in that, The high C 12 A7 content high-alumina clinker contains C 12 The A7 content is 18-24%.

3. The cement-based porcelain adhesive for ultra-high voltage insulators according to claim 1, characterized in that, The high-speed ferroaluminate cement contains 55-75% C4A3, 15-30% C2S, and 15-30% iron phase.

4. The cement-based porcelain adhesive for ultra-high voltage insulators according to claim 1, characterized in that, The strength grade of the silicate cement is ≥52.

5.

5. The cement-based porcelain adhesive for ultra-high voltage insulators according to claim 1, characterized in that, The ultrafine admixture is at least one of silica fume and ultrafine mineral powder.

6. The cement-based porcelain adhesive for ultra-high voltage insulators according to claim 1, characterized in that, The ultrafine admixture is a mixture of silica fume and ultrafine mineral powder in a mass ratio of (5-8):(8-12).

7. The cement-based porcelain adhesive for ultra-high voltage insulators according to claim 1, characterized in that, The early strength agent is lithium carbonate, the water-reducing agent is polycarboxylate water-reducing agent, and the retarding agent is L-tartaric acid.

8. The cement-based porcelain adhesive for ultra-high voltage insulators according to claim 1, characterized in that, The toughening fiber is at least one of polypropylene fiber and basalt fiber.

9. The cement-based porcelain adhesive for ultra-high voltage insulators according to claim 1, characterized in that, The toughening fiber is a mixture of polypropylene fiber and basalt fiber in a mass ratio of (5-6):(4-5).

10. The method for preparing the cement-based electrical porcelain adhesive for ultra-high voltage insulators according to any one of claims 1-9, characterized in that, Includes the following steps: 1) Weigh each ingredient according to its weight. 2) Mix all the ingredients evenly to obtain the final product.