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CN-122025309-A - Waterproof corrosion-resistant busbar cable and preparation method

CN122025309ACN 122025309 ACN122025309 ACN 122025309ACN-122025309-A

Abstract

The invention relates to the technical field of cables, and discloses a waterproof and corrosion-resistant busbar cable and a preparation method thereof. The invention mixes polyethylene, PET copolyester, dicumyl peroxide and the like, and extrudes and granulates the mixture by a screw extruder to obtain a sheath material layer. The compatibility and interface combination property of PET copolyester and polyethylene are good, the mechanical properties of PET/PE composite sheath material layer and cable are improved, after the PET copolyester and PE are chemically crosslinked, the crosslinking degree of molecular chains is increased, the heat resistance is good, corrosion mediums such as water and salt are inhibited from entering into the composite sheath material layer, the high-temperature salt corrosion resistance of the sheath material layer and cable is improved, and the prepared converging cable, submarine cable and the like have better practical application in high-salt high-humidity environment.

Inventors

  • TU JIANBIN
  • LIU JUN
  • ZHU CONGWEI
  • Shan Hualu
  • XU YAFEI

Assignees

  • 江苏亨通光电股份有限公司

Dates

Publication Date
20260512
Application Date
20260414

Claims (10)

  1. 1. A preparation method of a waterproof and corrosion-resistant busbar cable comprises a conductor, an insulating layer and a sheath layer, and is characterized in that the preparation method of the sheath layer comprises the following steps: S1, adding terephthalic acid, ethylene glycol, 2-dimethylolpropionyl oil amine, a catalyst and a polymerization inhibitor into a reaction kettle, introducing nitrogen to perform esterification reaction, then performing polycondensation reaction, and discharging to obtain PET copolyester; s2, mixing polyethylene, PET copolyester, dicumyl peroxide and an antioxidant, extruding through a screw extruder, and granulating to obtain a sheath layer.
  2. 2. The method for preparing the waterproof and corrosion-resistant bus cable according to claim 1, wherein the molar ratio of terephthalic acid, ethylene glycol, 2-dimethylolpropionyl oil amine, catalyst and polymerization inhibitor in S1 is (52-60): (88-96): (4-12): (0.012-0.018): (0.003-0.01).
  3. 3. The method for preparing the waterproof and corrosion-resistant bus cable according to claim 2, wherein the preparation method of the 2, 2-dimethylolpropionyl oil amine is characterized in that 1, 4-dioxane is added into a reaction container, the molar ratio is (1-1.1), 1 (1-1.1) of 2, 2-dimethylolpropionic acid, oleylamine and N, N-dicyclohexylcarbodiimide are stirred and reacted for 12-18 hours at 20-30 ℃, the filtrate is rotationally evaporated after filtration, and the product is recrystallized to obtain the 2, 2-dimethylolpropionyl oil amine.
  4. 4. The method for preparing the waterproof and corrosion-resistant bus cable according to claim 1, wherein the catalyst in the step S1 is ethylene glycol antimony, and the polymerization inhibitor is 2, 6-di-tert-butyl-p-cresol.
  5. 5. The method for preparing the waterproof and corrosion-resistant confluence cable according to claim 1, wherein the pressure in the reaction kettle is controlled to be 0.08-0.12MPa by introducing nitrogen in the S1.
  6. 6. The method for preparing the waterproof and corrosion-resistant bus cable according to claim 1, wherein the esterification reaction in the step S1 is carried out for 20-40min at 160-175 ℃ and then heated to 220-240 ℃ until no esterification moisture is distilled off.
  7. 7. The method for producing a water-resistant corrosion-resistant bus cable according to claim 1, wherein the polycondensation reaction in S1 is carried out at 270 to 285 ℃ for 2 to 4 hours, and the pressure in the reaction vessel is controlled to 100 to 200Pa.
  8. 8. The preparation method of the waterproof and corrosion-resistant bus cable according to claim 1, wherein the mass ratio of polyethylene, PET copolyester and antioxidant in the S2 is (75-90): 10-25): 0.6-1.3): 0.1-0.3.
  9. 9. The method for preparing the waterproof and corrosion-resistant bus cable according to claim 1, wherein the temperature of each section of the screw extruder in the step S2 is 180-265 ℃ and the screw rotating speed is 40-70r/min.
  10. 10. A water-resistant and corrosion-resistant bus cable obtainable by the process according to any one of claims 1 to 9.

Description

Waterproof corrosion-resistant busbar cable and preparation method Technical Field The invention relates to the technical field of cables, in particular to a waterproof and corrosion-resistant busbar cable and a preparation method thereof. Background The cable is a common electric energy and signal transmission device, has excellent mechanical and corrosion resistance and other performances besides the electric performance meeting the standard, and is generally composed of a wire, an insulating layer, a sheath material and the like, wherein the sheath material plays a role in protection and has great influence on the performance of the cable. The polyethylene sheath material has the advantages of excellent electrical insulation performance, good flexibility, easy winding and wide application, but the traditional polyethylene sheath material has lower strength and poor mechanical protection capability. The polyester is a high-performance resin material, has various types, good insulating property, high mechanical strength, excellent high temperature resistance and easy processing, and can be combined with polyethylene, nylon, polycarbonate and other materials to obtain a composite material with better performance. Patent CN115521525B discloses that the obtained composite material can be effectively applied to the wire and cable sheath by mixing polyethylene resin, vinyl-terminated hyperbranched polyester, ethylene-vinyl acetate copolymer and the like, but the patent does not improve the mechanical properties such as stretching of the polyethylene material, and the service lives of sheath materials and cables can be affected. Disclosure of Invention The invention solves the technical problems that a polyethylene sheath layer and a cable thereof are corrosion resistant and poor in strength. The technical scheme of the invention is that the waterproof corrosion-resistant bus cable comprises a conductor, an insulating layer and a sheath layer, wherein the preparation method of the sheath layer comprises the following steps: s1, adding terephthalic acid, ethylene glycol, 2-dimethylolpropionyl oil amine, a catalyst and a polymerization inhibitor into a reaction kettle, introducing nitrogen to perform esterification reaction, then performing polycondensation reaction, and discharging to obtain the PET copolyester. S2, uniformly mixing polyethylene, PET copolyester and an antioxidant, extruding through a screw extruder, and granulating to obtain the sheath material layer. Preferably, the molar ratio of terephthalic acid, ethylene glycol, 2-dimethylolpropionyl amine, catalyst and polymerization inhibitor in S1 is (52-60): (88-96): (4-12): (0.012-0.018): (0.003-0.01). Preferably, the catalyst in S1 is ethylene glycol antimony. Preferably, the polymerization inhibitor in S1 is 2, 6-di-tert-butyl-p-cresol. Preferably, nitrogen is introduced into the S1 to control the pressure in the reaction kettle to be 0.08-0.12MPa. Preferably, the esterification reaction in S1 is carried out by stirring for 20-40min at 160-175 ℃, then heating to 220-240 ℃, and stirring until no esterification water is distilled off. Preferably, the polycondensation reaction in S1 is carried out by stirring at 270-285 ℃ for 2-4 hours, and the pressure in the reaction kettle is controlled to be 100-200Pa. Preferably, the mass ratio of the polyethylene, the PET copolyester and the antioxidant in the S2 is (75-90): 10-25): 0.6-1.3): 0.1-0.3. Preferably, the temperature of each section of the screw extruder in the step S2 is 180-265 ℃, and the screw rotating speed is 40-70r/min. Preferably, the preparation method of the 2, 2-dimethylolpropionyl oleylamine comprises the steps of adding 1, 4-dioxane, 2-dimethylolpropionic acid, oleylamine and N, N-dicyclohexylcarbodiimide into a reaction vessel, carrying out amidation reaction, filtering, rotationally evaporating filtrate, and recrystallizing the product in dichloromethane to obtain the 2, 2-dimethylolpropionyl oleylamine. Preferably, the molar ratio of 2, 2-dimethylolpropionic acid, oleylamine, N-dicyclohexylcarbodiimide is (1-1.1): 1 (1-1.1). Preferably, the amidation reaction is carried out with stirring at 20-30℃for 12-18h. The invention has the beneficial technical effects that glycol, 2-dimethylolpropionyl oil amine and terephthalic acid are subjected to melt esterification polycondensation reaction to obtain PET copolyester, and then the PET copolyester is blended with polyethylene, dicumyl peroxide and the like to obtain a polyethylene sheath layer and a waterproof corrosion-resistant bus cable. The PET copolyester contains an alkyl long chain, has good compatibility with polyethylene, is favorable for improving the mechanical properties of the PET/PE composite sheath layer and the cable, contains PET copolyester unsaturated alkenyl, and has a crosslinking reaction with the polyethylene under the action of dicumyl peroxide, so that the interfacial bonding property between PET and the polyethylene is