Search

CN-121687625-B - New energy copper alloy power cable

CN121687625BCN 121687625 BCN121687625 BCN 121687625BCN-121687625-B

Abstract

The invention relates to the field of power cable manufacturing and conductor surface modification, in particular to a new energy copper alloy power cable. Comprises a copper alloy conductor stranded by a plurality of monofilaments, and an interface modification layer chemically bonded on the surface, wherein the layer is prepared from pyromellitic dianhydride, 5-aminobenzotriazol, thioglycollic acid or the like -Mercaptopropyl trimethoxysilane, glycidyl methacrylate or allyl chloride and solvent curing; one end anchors the conductor by Cu-S bond, and the other end is crosslinked with the insulating layer by alkenyl or epoxy group, and reacts and combines when vulcanizing at high temperature; the invention solves the problem of weak binding force of the traditional physical contact interface and improves the mechanical stability of the whole structure of the cable.

Inventors

  • GUO ZHIHAO
  • ZHANG AIMEI
  • QIU YIHUI

Assignees

  • 福建成田科技有限公司

Dates

Publication Date
20260505
Application Date
20260212

Claims (8)

  1. 1. The new energy copper alloy power cable is characterized by comprising a copper alloy conductor, an interface modification layer, an insulating layer and an outer sheath layer which are sequentially arranged from inside to outside; the copper alloy conductor is formed by twisting a plurality of copper alloy monofilaments to form a conductive wire core of the cable, and the interface modification layer is attached to the surface of the copper alloy conductor in a chemical bonding mode; The interface modification layer is formed by solidifying an organic-inorganic hybrid ternary functional interface modifier, and the organic-inorganic hybrid ternary functional interface modifier comprises the following preparation raw materials, by weight, 20-30 parts of pyromellitic dianhydride, 15-25 parts of 5-aminobenzotriazole, 10-18 Parts of mercaptopropyl trimethoxy silane or mercaptoacetic acid, 12-20 parts of glycidyl methacrylate or allyl chloride and 80-120 parts of organic solvent; The interface modification layer forms a molecular-level welding structure between the copper alloy conductor and the insulating layer, wherein one end of the organic-inorganic hybridization ternary function interface modifier forms Cu-S covalent bond anchoring with the surface of the copper alloy conductor through a mercaptan bond or a disulfide bond, and the other end forms a cross-linked network with a molecular chain of the insulating layer through an alkenyl or epoxy group; The insulating layer is made of crosslinked polyethylene material, and the insulating layer and the active double bond of the interface modification layer are subjected to chemical reaction in the high-temperature vulcanization process; the preparation method of the organic-inorganic hybrid ternary functional interface modifier comprises the following steps: s1, skeleton construction, namely dissolving pyromellitic dianhydride in an organic solvent, adding 5-aminobenzotriazol under the protection of nitrogen, starting a stirring device for dispersing, heating to 140-160 ℃, keeping a reflux condensation state for reaction for 3-5 hours, and carrying out imidization reaction to obtain an intermediate solution containing a corrosion resistant core; Step S2, grafting an anchoring group, namely, reducing the temperature of a reaction system to 50-70 ℃, and slowly dropwise adding the reaction system into the intermediate solution If the mercaptopropyl trimethoxy silane or the mixed solution of the mercaptoacetic acid and the dehydration condensing agent is dripped, the method adopts Adding an acidic regulator into the mercaptopropyl trimethoxy silane to promote hydrolysis, stirring at constant temperature for 2-4 hours, and grafting a mercaptan bond functional group at one end of the framework; and S3, end group functional modification, namely adding a catalyst into the system obtained in the step S2, heating to 80-90 ℃, if the glycidyl methacrylate is added, adding a quaternary ammonium salt catalyst to carry out ring-opening addition reaction, and keeping part of active thiol groups by controlling the molar ratio of reactants, if allyl chloride is added, adding an acid binding agent to carry out nucleophilic substitution reaction, continuing to carry out heat preservation reaction for 3-5 hours, and distilling under reduced pressure to remove a solvent after the reaction is finished, thereby obtaining the organic-inorganic hybrid ternary functional interface modifier.
  2. 2. The new energy copper alloy power cable according to claim 1, wherein the coating process of the interface modification layer comprises the steps of uniformly spraying nano dispersion liquid of the organic-inorganic hybrid ternary functional interface modifier with the concentration of 1.0% -5.0% on the surface of a copper alloy conductor by utilizing an ultrasonic atomization device in a cooling stage after wiredrawing and annealing of the copper alloy conductor; in the preparation process of the nano dispersion liquid, a mode of combining high-speed shearing and ultrasonic dispersion is adopted, and the modifier is dispersed in absolute ethyl alcohol with the mass fraction of 2.0%, so that the particle size of the modifier is ensured to reach nano-scale distribution.
  3. 3. The new energy copper alloy power cable according to claim 2, wherein the film forming process of the interface modification layer comprises a heat-activated self-assembly step: the copper alloy conductor coated with the nano dispersion liquid is subjected to heat preservation treatment through a drying tunnel with the temperature of 60-80 ℃ or by utilizing annealing residual temperature; In the heat preservation process, the thiol group in the modifier and the copper surface are promoted to generate dehydrogenation reaction, and the self-assembled monomolecular film is formed after standing and defoaming.
  4. 4. The new energy copper alloy power cable according to claim 1, wherein the forming method of the insulating layer comprises the steps of adding a cross-linked polyethylene base material into an extruder, and extruding and coating the cross-linked polyethylene base material outside the interface modification layer in a high-temperature vulcanization environment at 180-200 ℃; In the process, the terminal alkenyl or epoxy group of the interface modifier is thermally activated to participate in the crosslinking network reaction of the insulating material, so that the in-situ crosslinking composition of the conductor and the insulating layer is realized.
  5. 5. The new energy copper alloy power cable according to claim 1, wherein the copper alloy conductor has a corrosion resistance time of more than 96 hours in a neutral salt spray test after being treated by the interface modification layer, and a surface contact resistance change rate of less than 5% after being aged at 200 ℃ for 168 hours at high temperature.
  6. 6. The new energy copper alloy power cable of claim 1, wherein the peel strength between the insulating layer and the copper alloy conductor is improved by more than 50% as compared with an unmodified cable, and wherein the fracture surface exhibits cohesive failure characteristics, i.e., fracture occurs within the body of insulating layer material, rather than at the interface of the copper alloy conductor and the insulating layer.
  7. 7. The new energy copper alloy power cable according to claim 1, wherein in the step S1, the organic solvent is N, N-dimethylformamide or dimethyl sulfoxide, and in the step S3, the catalyst is a quaternary ammonium salt phase transfer catalyst.
  8. 8. The new energy copper alloy power cable according to claim 4, wherein the extruder is controlled by multi-stage gradient temperature rise, and the temperatures of the temperature zones are sequentially set to 150-160 ℃, 165-175 ℃, 180-190 ℃ and 195-200 ℃ from the feed inlet to the machine head direction, so that the insulating layer material and the interface modification layer are crosslinked in a molten state and early scorch is avoided.

Description

New energy copper alloy power cable Technical Field The invention relates to the field of power cable manufacturing and conductor surface modification, in particular to a new energy copper alloy power cable. Background At present, the power cable is constructed by means of copper alloy conductors matched with polymer insulating layers, electric energy transmission and distribution are realized through the hierarchical arrangement of the conductors and the insulating layers, and a standardized structure system is formed in a conventional power transmission and distribution environment; However, in the related art, as the cable is exposed to severe marine atmosphere environment with high salt fog and high damp and heat for a long time in specific new energy application scenes such as offshore wind power, the problems of interface corrosion and layering of the traditional cable are aggravated, and the copper alloy power cable based on the traditional physical contact or simple physical coating treatment is exposed to obvious adaptability defects; in addition, a firm molecular welding structure cannot be formed between the conductor and the insulating layer, the interface binding force is weak, the interface stripping or detachment phenomenon is very easy to occur in the heat expansion and cold contraction circulation, and the electrical stability and the service life of the cable under a severe environment are severely restricted; therefore, a solution is needed to solve the problems of poor corrosion resistance and weak interface bonding of the copper alloy conductor in the prior art. Disclosure of Invention The invention aims to provide a new energy copper alloy power cable, which effectively solves the problems of oxidation corrosion and contact resistance increase caused by migration or volatilization of a physical adsorption preservative of a copper alloy conductor in a high-temperature high-humidity salt fog environment, and remarkably improves the interface bonding strength between the conductor and an insulating layer and the electrical stability of long-term operation by constructing an organic-inorganic hybrid molecular-level welding structure, wherein the technical scheme of the invention comprises the following steps: The copper alloy conductor, the interface modification layer, the insulating layer and the outer sheath layer are sequentially arranged from inside to outside; the copper alloy conductor is formed by twisting a plurality of copper alloy monofilaments to form a conductive wire core of the cable, and the interface modification layer is attached to the surface of the copper alloy conductor in a chemical bonding mode; The interface modification layer is formed by solidifying an organic-inorganic hybrid ternary functional interface modifier, and the organic-inorganic hybrid ternary functional interface modifier comprises the following preparation raw materials, by weight, 20-30 parts of pyromellitic dianhydride, 15-25 parts of 5-aminobenzotriazole, 10-18 Parts of mercaptopropyl trimethoxy silane or mercaptoacetic acid, 12-20 parts of glycidyl methacrylate or allyl chloride and 80-120 parts of organic solvent; The interface modification layer forms a molecular-level welding structure between the copper alloy conductor and the insulating layer, wherein one end of the organic-inorganic hybridization ternary function interface modifier forms Cu-S covalent bond anchoring with the surface of the copper alloy conductor through a mercaptan bond or a disulfide bond, and the other end forms a cross-linked network with a molecular chain of the insulating layer through an alkenyl or epoxy group; the insulating layer is made of crosslinked polyethylene material, and the insulating layer and the active double bond of the interface modification layer are subjected to chemical reaction in the high-temperature vulcanization process. Preferably, the preparation method of the organic-inorganic hybrid ternary functional interface modifier comprises the following steps: S1, constructing a framework, namely dissolving the pyromellitic dianhydride in an organic solvent, adding the 5-aminobenzotriazol under the protection of nitrogen, starting a stirring device for dispersing, and heating to a temperature of up to Maintaining reflux condensation state reactionCarrying out imidization reaction for an hour to obtain an intermediate solution containing a corrosion-resistant core; Step S2, grafting the anchoring group, and reducing the temperature of the reaction system to be low Slowly dropwise adding the intermediate solutionIf the mercaptopropyl trimethoxy silane or the mixed solution of the mercaptoacetic acid and the dehydration condensing agent is dripped, the method adoptsThe mercaptopropyl trimethoxy silane is added with an acid regulator to promote hydrolysis, and the reaction is stirred at constant temperatureFor hours, grafting a mercaptan bond functional group at one end of the framework; s3, end group fu