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CN-122011568-A - Efficient radiation crosslinking halogen-free flame-retardant cable material and preparation method thereof

CN122011568ACN 122011568 ACN122011568 ACN 122011568ACN-122011568-A

Abstract

The application relates to the technical field of cable materials, in particular to a high-efficiency radiation crosslinking halogen-free flame-retardant cable material and a preparation method thereof, wherein the high-efficiency radiation crosslinking halogen-free flame-retardant cable material comprises, by weight, 15-25 parts of ethylene-vinyl acetate copolymer, 3-8 parts of hyperbranched polyethylene resin, 0.5-1.5 parts of vinyl-terminated hyperbranched polymer, 12-18 parts of compatilizer, 35-45 parts of flame retardant, 0.8-1.2 parts of antioxidant, 1-3 parts of anti-radiation agent and 1.5-3 parts of crosslinking sensitizer, and has the advantage of being capable of improving the crosslinking degree of the cable material under low radiation dose.

Inventors

  • ZENG GUANGXIN
  • WANG XIAO
  • ZHANG CHAO
  • QIAN CHENGHAO
  • Ren Huangjie

Assignees

  • 杭州美临新材料科技有限公司

Dates

Publication Date
20260512
Application Date
20260313

Claims (8)

  1. 1. The high-efficiency radiation crosslinking halogen-free flame-retardant cable material is characterized by comprising, by weight, 15-25 parts of ethylene-vinyl acetate copolymer, 3-8 parts of hyperbranched polyethylene resin, 0.5-1.5 parts of vinyl-terminated hyperbranched polymer, 12-18 parts of compatilizer, 35-45 parts of flame retardant, 0.8-1.2 parts of antioxidant, 1-3 parts of anti-radiation agent and 1.5-3 parts of crosslinking sensitizer.
  2. 2. The efficient radiation crosslinking halogen-free flame retardant cable material of claim 1, wherein the vinyl-terminated hyperbranched polymer is prepared by reacting amino-terminated hyperbranched polyamide with acrylic chloride.
  3. 3. The efficient radiation crosslinking halogen-free flame retardant cable material of claim 2, wherein the amino-terminated hyperbranched polyamide has an average molecular weight of 900-2200Da.
  4. 4. The efficient radiation crosslinking halogen-free flame-retardant cable material of claim 1, wherein the crosslinking sensitizer comprises a crosslinking sensitizer A and a crosslinking sensitizer B, the crosslinking sensitizer A is one or more of trimethylolpropane triacrylate, trimethylolpropane trimethacrylate and triallyl isocyanurate, and the crosslinking sensitizer B is one or more of tris (2-hydroxyethyl) isocyanurate triacrylate and di (trimethylolpropane) tetraacrylate.
  5. 5. The efficient radiation crosslinking halogen-free flame-retardant cable material of claim 4, wherein the mass ratio of the crosslinking sensitizer A to the crosslinking sensitizer B is (1-1.7) to (0.3-1).
  6. 6. The efficient radiation crosslinked halogen-free flame-retardant cable material as claimed in claim 1, wherein the raw materials of the efficient radiation crosslinked halogen-free flame-retardant cable material further comprise 0.5-1.5 parts by weight of double-end vinyl silicone oil.
  7. 7. The efficient radiation crosslinked halogen-free flame-retardant cable material of claim 1, wherein the antioxidant is a mixture of antioxidant 1010 and antioxidant 168.
  8. 8. A method for preparing the high-efficiency radiation crosslinked halogen-free flame-retardant cable material as claimed in any one of claims 1 to 7, which is characterized by comprising the following steps: s1, uniformly mixing the raw materials, and then putting the mixture into a double-screw extruder for extrusion granulation to obtain master batch; S2, extruding the prepared master batch in an extruder to prepare a cable with the wall thickness less than or equal to 1.5mm, and performing radiation crosslinking at the irradiation dose of 5-10Mrad to obtain the high-efficiency radiation crosslinking halogen-free flame-retardant cable material.

Description

Efficient radiation crosslinking halogen-free flame-retardant cable material and preparation method thereof Technical Field The application relates to the technical field of cable materials, in particular to a high-efficiency radiation crosslinking halogen-free flame-retardant cable material and a preparation method thereof. Background The irradiation crosslinking halogen-free flame-retardant cable material is used as a key base material of a high-performance special cable, and has important application in complex working condition environments requiring high reliability and high safety, such as rolling stock, nuclear power station and the like. The material needs to have excellent flame retardance, low smoke density, heat resistance, radiation resistance, mechanical strength, oil resistance and other multiple performances. Although the traditional irradiation crosslinking polyolefin cable material has certain crosslinking efficiency and processing convenience, when the high crosslinking degree or thickness is realized, the irradiation dose is often required to be increased, so that the production cost and the energy consumption are increased, the irradiation degradation of a polymer matrix is easily initiated, the problems of large consumption of an antioxidant, degradation of the ageing property of the material, poor uniformity of a crosslinking network and the like are caused, and the applicability of the irradiation crosslinking polyolefin cable material in cables with ultra-long service life and extreme environments is limited. Therefore, developing a cable material capable of realizing high crosslinking degree under low irradiation dose and simultaneously achieving excellent thermal stability and processing feasibility has become a technical problem to be broken through in the field of high-end cables Disclosure of Invention In order to improve the crosslinking degree of the cable material under low irradiation dose, the application provides a high-efficiency radiation crosslinking halogen-free flame-retardant cable material and a preparation method thereof. In a first aspect, the application provides a high-efficiency radiation crosslinking halogen-free flame-retardant cable material, which adopts the following technical scheme: The high-efficiency radiation crosslinking halogen-free flame-retardant cable material comprises, by weight, 15-25 parts of an ethylene-vinyl acetate copolymer, 3-8 parts of a hyperbranched polyethylene resin, 0.5-1.5 parts of a vinyl-terminated hyperbranched polymer, 12-18 parts of a compatilizer, 35-45 parts of a flame retardant, 0.8-1.2 parts of an antioxidant, 1-3 parts of an anti-radiation agent and 1.5-3 parts of a crosslinking sensitizer. By adopting the technical scheme, the ethylene-vinyl acetate copolymer and the hyperbranched polyethylene resin are blended to be used as matrix resin, the ethylene-vinyl acetate copolymer can provide polarity and flexibility, and the hyperbranched polyethylene resin can become sensitive points of irradiation crosslinking because the hyperbranched structure of the hyperbranched polyethylene resin contains more ethylene groups, so that the blending of the ethylene-vinyl acetate copolymer and the hyperbranched polyethylene resin provides a basis for efficient crosslinking. Based on the above, vinyl-terminated hyperbranched polymers are added, which is a key means of the efficient crosslinking of the application, the hyperbranched three-dimensional spherical structure of the vinyl-terminated hyperbranched polymer has a large number of terminal functional groups, and under irradiation, the terminal vinyl groups are activated, so that uniform micro crosslinking points can be formed in a matrix, the density of reaction sites is greatly increased, and the crosslinking reaction rate and crosslinking density are remarkably improved. Meanwhile, the vinyl-terminated hyperbranched polymer has low viscosity due to the self characteristics of the hyperbranched polymer, and has better compatibility with the ethylene-vinyl acetate copolymer, so that the vinyl-terminated hyperbranched polymer can be uniformly distributed in a matrix, and is also an important reason for high-efficiency crosslinking. Meanwhile, the spherical and branched chain extending structure can wrap the crosslinking sensitizer molecules to a certain extent, and after the crosslinking sensitizer is excited by radiation, the crosslinking of the vinyl-terminated hyperbranched polymer can be initiated more rapidly, which is also a factor for exerting high-efficiency crosslinking. Therefore, through the cooperative matching of the raw materials, the cable material can realize high-efficiency crosslinking under low irradiation dose, and the comprehensive performance of the cable material is improved. Preferably, the vinyl-terminated hyperbranched polymer is prepared by reacting amino-terminated hyperbranched polyamide and acryloyl chloride. By adopting the technical scheme, the syntheti