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CN-122011609-A - Insulation protective sleeve material for high-voltage cable and preparation method thereof

CN122011609ACN 122011609 ACN122011609 ACN 122011609ACN-122011609-A

Abstract

The invention discloses an insulating protective sleeve material for a high-voltage cable and a preparation method thereof, wherein the protective sleeve material comprises, by weight, 100-120 parts of modified polyethylene, 5-8 parts of modified silicon dioxide, 1-3 parts of a modified additive and 2-5 parts of 2,2'- (1, 3-phenylene) -bisoxazoline, and the oxazoline at one end of the 2,2' - (1, 3-phenylene) -bisoxazoline reacts with carboxyl on the modified polyethylene in the raw material melt extrusion process, and the oxazoline at the other end reacts with amino on the modified additive or amino on the modified silicon dioxide, so that dynamic cross-linking is formed between modified polyethylene molecules and modified additive molecules, and polysiloxane chain segments are inserted between molecular networks to form a semi-interpenetrating network, so that the mechanical property of the material is greatly improved, and the mechanical strength of the material is remarkably improved on the premise that the excellent electrical insulation property is maintained by adding the modified silicon dioxide.

Inventors

  • DENG MEIZHOU
  • HU XINTING
  • XIE LONGJUN

Assignees

  • 武汉市黄鹤电线电缆一厂有限公司

Dates

Publication Date
20260512
Application Date
20260410

Claims (10)

  1. 1. The preparation method of the insulating protective sleeve material for the high-voltage cable is characterized by comprising the following steps of: Step A1, dispersing silicon dioxide in ethanol, stirring and adding gamma-aminopropyl triethoxysilane and deionized water for reaction to prepare aminated silicon dioxide; Step A2, mixing polyethylene, maleic anhydride and dicumyl peroxide, adding the mixture into a double-screw extruder, and carrying out melt extrusion to obtain pretreated polyethylene; Step A3, soaking the pretreated polyethylene in a sodium hydroxide solution, stirring, filtering to remove filtrate, soaking a substrate in a hydrochloric acid solution, and stirring to obtain modified polyethylene; And step A4, weighing the following raw materials, by weight, 100-120 parts of modified polyethylene, 5-8 parts of modified silicon dioxide, 1-3 parts of modified additive and 2-5 parts of 2,2' - (1, 3-phenylene) -bisoxazoline, and adding the raw materials into a double-screw extruder for melt extrusion to prepare the insulating protective sleeve material for the high-voltage cable.
  2. 2. The method for preparing insulation protection sleeve material for high voltage cable according to claim 1, wherein the amount of gamma-aminopropyl triethoxysilane in the step A1 is 3% of the mass of silicon dioxide.
  3. 3. The method for preparing insulation protection sleeve material for high-voltage cables according to claim 1, wherein the mass ratio of polyethylene, maleic anhydride and dicumyl peroxide in the step A2 is 100:1.5:0.08.
  4. 4. The method for preparing insulation protection sleeve material for high voltage cable according to claim 1, wherein the mass fraction of sodium hydroxide solution in the step A3 is 10%, and the mass fraction of hydrochloric acid solution is 10%.
  5. 5. The method for preparing insulation protection sleeve material for high voltage cable according to claim 1, wherein the modified additive is prepared by the following steps: Step B1, mixing maleic anhydride and acetone, introducing nitrogen for protection, stirring, adding 4,4' -diaminodiphenyl disulfide, reacting, adding sodium acetate and acetic anhydride, heating and refluxing for reaction for 8-10 hours to obtain an intermediate, mixing furancarboxylic acid, the intermediate and DMF, introducing nitrogen for protection, and reacting to obtain a modified monomer; step B2, mixing octamethyl cyclotetrasiloxane, tetramethyl ammonium hydroxide, 1, 3-bis (aminopropyl) tetramethyl disilyl ether and tetrahydrofuran, and introducing nitrogen for protection to react to obtain aminopolysiloxane; step B3, mixing lithium trimethylsilanol and tetrahydrofuran, introducing nitrogen for protection, stirring, adding hexamethylcyclotrisiloxane, heating for reaction, adding vinyl trichlorosilane, and continuing to react to obtain branched polysiloxane; and B4, mixing the aminated polysiloxane, the branched polysiloxane, the chloroplatinic acid and the xylene, introducing nitrogen for protection, reacting to obtain modified polysiloxane, mixing the modified monomer, the 4-dimethylaminopyridine and the xylene, introducing nitrogen for protection, stirring, adding the modified polysiloxane and dicyclohexylcarbodiimide, and reacting to obtain the modified additive.
  6. 6. The method for preparing insulation protection sleeve material for high voltage cables according to claim 5, wherein the molar ratio of maleic anhydride, 4' -diaminodiphenyl disulfide, sodium acetate and acetic anhydride in the step B1 is 16:8:8:9, and the molar ratio of furancarboxylic acid and intermediate is 1:2.
  7. 7. The method of claim 5, wherein the molar ratio of octamethyl cyclotetrasiloxane, tetramethyl ammonium hydroxide, and 1, 3-bis (aminopropyl) tetramethyl disilyl ether in the step B2 is 1:0.2:1.5:1.
  8. 8. The method of claim 5, wherein the molar ratio of the lithium trimethylsilanol, the hexamethylcyclotrisiloxane and the Si-Cl bond on the vinyltrichlorosilane in the step B3 is 1:5:1.
  9. 9. The method for preparing insulation protective sleeve material for high-voltage cables according to claim 5, wherein the molar ratio of Si-H on the aminated polysiloxane to the branched polysiloxane in the step B4 is 1:1, the amount of the Kasite catalyst is 0.01% of the mass of the branched polysiloxane, and the amount ratio of the modified monomer, 4-dimethylaminopyridine, the modified polysiloxane and dicyclohexylcarbodiimide is 1:0.5:2:2.1.
  10. 10. An insulation protective sleeve material for a high-voltage cable is characterized by being prepared by the preparation method according to any one of claims 1-9.

Description

Insulation protective sleeve material for high-voltage cable and preparation method thereof Technical Field The invention relates to the technical field of preparation of cable protective sleeve materials, in particular to an insulating protective sleeve material for a high-voltage cable and a preparation method thereof. Background The high-voltage cable is used as a key infrastructure for power transmission, and plays an irreplaceable role in the projects of power grid construction, cross-regional networking, offshore wind power access and the like. With the rapid development of new energy power generation and the deep advancement of urban power grid transformation, the application requirements of high-voltage and ultra-high-voltage cables are continuously increased, the technical performance and the quality level of the insulating protective sleeve material used as a core component for guaranteeing the safe operation of the cables are directly related to the reliability and the service life of the whole power system, and polyolefin materials represented by low-density polyethylene, linear low-density polyethylene and cross-linked products thereof are becoming main stream matrix materials of high-voltage cable insulation and protective sleeves due to excellent electrical insulation performance, good processability, lower density and cost, but the tensile strength, tear resistance and wear resistance of the main stream matrix materials are limited, so that the requirements of higher voltage levels and increasingly improved mechanical protection of complex laying environments (such as direct burial, tunnels and seafloor) are difficult to meet. Disclosure of Invention The invention aims to provide an insulating protective sleeve material for a high-voltage cable and a preparation method thereof, which solve the problem that polyethylene for the protective sleeve material in the prior art has poor mechanical properties. The aim of the invention can be achieved by the following technical scheme: The preparation method of the insulating protective sleeve material for the high-voltage cable specifically comprises the following steps: step A1, dispersing silicon dioxide in ethanol, stirring and adding gamma-aminopropyl triethoxysilane and deionized water under the condition of the rotating speed of 300-500r/min and the temperature of 70-75 ℃ to react for 3-5 hours to obtain aminated silicon dioxide; Step A2, mixing polyethylene, maleic anhydride and dicumyl peroxide, adding the mixture into a double-screw extruder, and carrying out melt extrusion under the conditions that the rotating speed is 120-150r/min, and the temperature of three sections and a machine head is 170, 180, 200 and 220 ℃ to obtain pretreated polyethylene; Step A3, soaking the pretreated polyethylene in a sodium hydroxide solution, stirring at the rotating speed of 200-300r/min and the temperature of 90-95 ℃ for 1-1.5 hours, filtering to remove filtrate, soaking a substrate in a hydrochloric acid solution, and stirring at the rotating speed of 200-300r/min and the temperature of 20-25 ℃ for 0.5-1 hour to obtain the modified polyethylene; and step A4, weighing 100-120 parts by weight of modified polyethylene, 5-8 parts by weight of modified silicon dioxide, 1-3 parts by weight of modified additive and 2-5 parts by weight of 2,2' - (1, 3-phenylene) -bisoxazoline, adding the raw materials into a double-screw extruder, and carrying out melt extrusion under the conditions that the rotating speed is 120-150r/min, and the temperature of three sections and a machine head is 170, 180, 200 and 220 ℃ to obtain the insulating protective sleeve material for the high-voltage cable. Further, the amount of gamma-aminopropyl triethoxysilane described in step A1 is 3% of the mass of silica. Further, the mass ratio of polyethylene, maleic anhydride and dicumyl peroxide in the step A2 is 100:1.5:0.08. Further, the mass fraction of the sodium hydroxide solution in the step A3 is 10%, and the mass fraction of the hydrochloric acid solution is 10%. Further, the modified additive is prepared by the following steps: Step B1, mixing maleic anhydride and acetone, introducing nitrogen for protection, stirring and adding 4,4' -diaminodiphenyl disulfide at the rotating speed of 120-150r/min and the temperature of-5-0 ℃, reacting for 2-3 hours, adding sodium acetate and acetic anhydride, heating to 75-80 ℃, carrying out reflux reaction for 8-10 hours to obtain an intermediate, mixing furancarboxylic acid, the intermediate and DMF, introducing nitrogen for protection, and reacting for 8-10 hours at the rotating speed of 150-200r/min and the temperature of 70-80 ℃ to obtain a modified monomer; Step B2, mixing octamethyl cyclotetrasiloxane, tetramethyl ammonium hydroxide, 1, 3-bis (aminopropyl) tetramethyl disilyl ether and tetrahydrofuran, introducing nitrogen for protection, reacting for 10-15 hours at the rotating speed of 150-200r/min and the temperature of 90-95 ℃, heating t