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CN-121974622-A - Preparation method of full-dimensional cement-based super-wetted insulator material

CN121974622ACN 121974622 ACN121974622 ACN 121974622ACN-121974622-A

Abstract

The application discloses a preparation method of a full-dimensional cement-based super-wetted insulator material, which comprises the following steps of obtaining silicate cement slurry, sequentially adding a silane coupling agent and a super-wetted modifier into the silicate cement slurry to obtain first mixed slurry, compounding calcium carbonate particles, diatomite and hydrophobic silica particles with different particle diameters into the first mixed slurry, uniformly stirring, adding an active mineral admixture to obtain second mixed slurry, carrying out compression molding curing treatment on the second mixed slurry, and demoulding and curing to obtain the full-dimensional cement-based super-wetted insulator material.

Inventors

  • XIE YI
  • LUO JIAN

Assignees

  • 武汉理工大学

Dates

Publication Date
20260505
Application Date
20260114

Claims (10)

  1. 1. The preparation method of the full-dimensional cement-based super-wetted insulator material is characterized by comprising the following steps of: Obtaining silicate cement slurry; sequentially adding a silane coupling agent and a super-wetting modifier into the silicate cement slurry to obtain a first mixed slurry; compounding calcium carbonate particles, diatomite and hydrophobic silica particles with different particle diameters into the first mixed slurry, uniformly stirring, and then adding an active mineral admixture to obtain a second mixed slurry; and carrying out compression molding curing treatment on the second mixed slurry, and demoulding and curing to obtain the full-dimensional cement-based super-impregnated insulator material.
  2. 2. The method for preparing a full-dimensional cement-based super-wet insulator material according to claim 1, wherein the cement slurry has a water cement ratio of 0.25-0.4:1.
  3. 3. The method for preparing the full-dimensional cement-based super-wet insulator material according to claim 1, wherein the super-wet modifier is one or more of fluorine-containing silane and fluorine-free silane.
  4. 4. The method of preparing a full-dimensional cement-based super-wet insulator material according to claim 1, wherein the material ratio of the super-wet modifier to the portland cement paste is 0.025-0.05ml/g.
  5. 5. The method for preparing a full-dimensional cement-based super-wet insulator material according to claim 1, wherein the active mineral admixture comprises one or more of fly ash and slag powder.
  6. 6. The method of preparing a full-dimensional cement-based super-wet insulator material according to claim 1, wherein the material ratio of the active mineral admixture to the portland cement paste is 0.05-0.15g/g.
  7. 7. The method for preparing the full-dimensional cement-based super-wet insulator material according to claim 1, wherein the calcium carbonate particles comprise micron-sized calcium carbonate particles and nano-sized calcium carbonate particles, and the material ratio of the calcium carbonate particles to the silicate cement slurry is 0.05-0.15g/g.
  8. 8. The method for preparing the full-dimensional cement-based super-wet insulator material according to claim 1, wherein the diatomite is micron-sized diatomite, and the material ratio of the diatomite to the silicate cement slurry is 0.05-0.15g/g.
  9. 9. The method for preparing the full-dimensional cement-based super-wet insulator material according to claim 1, wherein the hydrophobic silica particles are nanoscale hydrophobic silica particles, and the material ratio of the hydrophobic silica particles to the silicate cement slurry is 0.025-0.05g/g.
  10. 10. The method for preparing a full-dimensional cement-based super-wet insulator material according to claim 1, wherein the temperature of the compression molding curing treatment is 5-10 ℃ and the time is 1-2 days.

Description

Preparation method of full-dimensional cement-based super-wetted insulator material Technical Field The invention relates to the technical field of insulators, in particular to a preparation method of a full-dimensional cement-based super-wetted insulator material. Background The insulator is a key component for realizing electrical isolation and mechanical support in an electric power system, and the surface performance of the insulator is directly related to the operation safety of a power grid under high-voltage and severe environments. The pollution flashover accident is one of main faults threatening the safe and stable operation of a power grid, and refers to the phenomenon that pollutants attached to the surface of an insulator form a conductive film under a humid condition (such as fog, dew and capillary rain), so that the insulating property of the insulator is reduced, and finally flashover discharge occurs. Statistics show that under specific environmental conditions, the pollution flashover fault has a significant proportion in the high-voltage line fault, and huge economic loss is caused. In order to improve the anti-pollution flashover capability of an insulator, the current technical path mainly focuses on surface functionalization modification, namely, a super-hydrophobic or super-amphiphobic (hereinafter collectively referred to as "super-wetting") coating is constructed on the surface of a traditional insulator (such as a ceramic insulator and a glass insulator). Such techniques typically apply fluorine/silane-containing low surface energy substances or nanoparticles (e.g., nanosilicon dioxide) by spraying, dipping, etc., in order to form lotus leaf-like micro-nano structures on the surface to achieve water and oil repellency. However, this surface coating-dependent technical path has inherent, insurmountable limitations, namely poor interface reliability and rapid performance decay, the coating being essentially physically bonded to the substrate, and a clear heterogeneous interface. Under the long-term complex working condition of the power equipment, the coating is easy to peel and crack due to insufficient interfacial binding force, so that the super-wettability is rapidly declined. Secondly, the introduction of weak points of insulation increases the risk of breakdown, and microscopic defects or discontinuous regions may exist at the interface between the coating and the substrate. These areas are prone to form electric field concentration or water bridge under moist or high voltage environment, but may induce partial discharge or even breakdown, and increase the overall insulation potential safety hazard of the insulator. Thirdly, the process is complex and the whole life cycle cost is high, and the existing coating technology (including some modified paints and application devices thereof) usually depends on fine multilayer spraying or complex surface treatment process, and the process is complex. More importantly, once the coating is damaged in use, the on-site repair is extremely difficult, the maintenance cost is high, and the requirements of long service life and high reliability of the power equipment cannot be met. In recent years, there have been studies on development of composite insulators in which the hydrophobicity and corona resistance are improved by material modification (e.g., addition of modified filler to silicone rubber). However, such a method can still be regarded as a "surface functionalization" concept (coating the functional layer on the substrate), or has the problem that the mechanical performance and the electrical performance are difficult to be compatible, and the mode of "the functional layer depends on the substrate" is not changed fundamentally. In summary, the current super-wetted insulator technology fails to break through the inherent paradigm of "substrate+functional coating", and the core contradiction is the reliability, lifetime and insulation safety problems brought by the interface between the coating and the substrate. Therefore, the development of a material body (but not the surface) which is an all-solid-state functional material with super-infiltration characteristic, high mechanical strength and stable electrical insulation property realizes the real 'structure-function' integration, and is a key direction for solving the pollution flashover prevention problem of power equipment and promoting the technical innovation. Disclosure of Invention In view of the above, the application provides a preparation method of a full-dimensional cement-based super-wetted insulator material, which is used for solving the problem of pollution flashover prevention of solid insulator power equipment. In order to achieve the technical purpose, the application adopts the following technical scheme: In a first aspect, the application provides a method for preparing a full-dimensional cement-based super-wetted insulator material, comprising the following steps