Search

CN-122011626-A - PVC sheath material for semiconductive oil-resistant low-smoke low-halogen ultrahigh-voltage cable and preparation method thereof

CN122011626ACN 122011626 ACN122011626 ACN 122011626ACN-122011626-A

Abstract

The invention relates to a PVC sheath material for a semiconductive oil-resistant low-smoke low-halogen ultrahigh-voltage cable and a preparation method thereof, wherein the PVC sheath material comprises, by weight, 100 parts of PVC resin, 35-55 parts of a composite plasticizer, 4-10 parts of a composite stabilizer, 25-35 parts of a semiconductive filler, 8-20 parts of an oil-resistant modifier, 20-40 parts of a low-smoke low-halogen flame-retardant synergist, 0.8-2.0 parts of a lubricant, 0.3-1.0 parts of an antioxidant and 0.5-2.0 parts of a silane coupling agent. The high-strength and high-elongation flame-retardant PVC cable has the synergistic effects of (1) controllable volume resistivity of not more than 1 multiplied by 10 2 omega cm, electric field homogenization, partial discharge inhibition, (2) excellent oil resistance, IRMS903 oil 100 DEG for 96h, volume change of not more than 10%, strength and elongation retention rate of not less than 85%, (3) low smoke density, less halogen release, flame retardance through VW-1/bundling, and (4) balanced mechanics, heat aging resistance, weather resistance and processability, and is suitable for extrusion of an ultrahigh-voltage cable.

Inventors

  • YAN JIANYUAN
  • YUAN BAO
  • LU WEI

Assignees

  • 江苏德威新材料股份有限公司

Dates

Publication Date
20260512
Application Date
20260324

Claims (10)

  1. 1. The PVC sheath material for the semiconductive oil-resistant low-smoke low-halogen ultrahigh-voltage cable is characterized by comprising the following raw material components in parts by weight: 100 parts of PVC resin; 35-55 parts of a composite plasticizer; 4-10 parts of a composite stabilizer; 25-35 parts of semiconductive filler; 8-20 parts of an oil-resistant modifier; 20-40 parts of low-smoke low-halogen flame-retardant synergist; 0.8-2.0 parts of lubricant; 0.3-1.0 parts of an antioxidant; 0.5-2.0 parts of silane coupling agent.
  2. 2. The PVC sheath material for the semiconductive oil-resistant low-smoke low-halogen ultrahigh-voltage cable, which is disclosed in claim 1, is characterized in that the polymerization degree of the PVC resin is 1300-2500; Optimally, the PVC resin is a mixture of one or more components selected from SG-3 and SG-1.
  3. 3. The PVC sheathing compound for a semiconductive oil-resistant low-smoke low-halogen ultrahigh-voltage cable of claim 1, wherein the compound plasticizer is a mixture of at least two components selected from DOTP, DPHP, TOTM and ESO; optimally, the composite plasticizer is a mixture of DOTP, TOTM and epoxidized soybean oil according to the mass ratio of 1-2:1-2:0.5.
  4. 4. The PVC sheathing compound for a semi-conductive oil-resistant low-smoke low-halogen ultra-high voltage cable according to claim 1, wherein the compound stabilizer is a mixture of at least two selected from the group consisting of calcium-zinc stabilizer, rare earth stabilizer and hydrotalcite.
  5. 5. The PVC sheathing compound for a semi-conductive oil-resistant low-smoke low-halogen ultra-high voltage cable according to claim 1, wherein the semi-conductive filler is a mixture of one or more selected from the group consisting of conductive carbon black, graphite and carbon nanotubes.
  6. 6. The PVC sheathing compound for a semiconductive oil-resistant low-smoke low-halogen ultrahigh-voltage cable of claim 1, wherein the oil-resistant modifier is a mixture of one or more selected from carboxylated nitrile rubber and maleic anhydride grafted SEBS.
  7. 7. The PVC sheathing compound for a semi-conductive oil-resistant low-smoke low-halogen ultra-high voltage cable according to claim 1, wherein the low-smoke low-halogen flame retardant synergist is a mixture composed of one or more selected from aluminum hydroxide, magnesium hydroxide, zinc borate and ammonium octamolybdate.
  8. 8. The PVC sheathing compound for a semi-conductive oil-resistant low-smoke low-halogen ultra-high voltage cable according to claim 1, wherein the lubricant is a mixture of one or more selected from PE wax, stearic acid and oxidized polyethylene wax.
  9. 9. The PVC sheathing compound for a semi-conductive oil-resistant low-smoke low-halogen ultra-high voltage cable according to claim 1, wherein the antioxidant is a mixture of one or more selected from the group consisting of antioxidant 1010 and antioxidant 168, and the silane coupling agent is a mixture of one or more selected from the group consisting of KH-550, KH-560 and KH-570.
  10. 10. The method for preparing the PVC sheath material for the semiconductive oil-resistant low-smoke low-halogen ultrahigh-voltage cable, as claimed in any one of claims 1 to 9, is characterized by comprising the following steps: (a) Stirring and mixing the PVC resin, the composite stabilizer, the antioxidant, the silane coupling agent and the composite plasticizer according to the formula amount at the temperature of 80-95 ℃; (b) Adding the semiconductive filler, the oil-resistant modifier, the low-smoke low-halogen flame-retardant synergist and the lubricant in the formula amount into the product of the step (a), and heating to 100-120 ℃ for stirring and mixing; (c) And (C) adding the product obtained in the step (b) into a double-screw extruder for granulating, cooling, air-drying, screening and packaging, wherein the technological parameters of the double-screw extruder are 120-135 ℃ in a first area, 135-150 ℃ in a second area, 145-165 ℃ in a third area and 155-165 ℃ in a machine head.

Description

PVC sheath material for semiconductive oil-resistant low-smoke low-halogen ultrahigh-voltage cable and preparation method thereof Technical Field The invention belongs to the technical field of cable sheath materials, relates to a PVC sheath material, and in particular relates to a PVC sheath material for a semiconductive oil-resistant low-smoke low-halogen ultrahigh-voltage cable and a preparation method thereof. Background The extra-high voltage cable is generally used for transmitting power cables with the power of more than 110kv, is generally used as a central link in a large-scale power transmission system, and is mainly used for long-distance power transmission. The ultra-high voltage cable sheath needs to meet the performance requirements of electric field homogenization, mechanical protection, oil resistance, chemical resistance, flame retardance, low smoke, low halogen and the like. The existing PVC sheath has the common problems of 1 poor semiconductive stability, large fluctuation of resistivity, uneven electric field, easy initiation of partial discharge, 2 insufficient oil resistance, swelling after oil immersion and obvious mechanical attenuation, 3 difficult balance of flame retardance, smoke toxicity and halogen release, high fire risk, 4 unmatched processability, long-term heat aging resistance and weather resistance. The conventional formula is difficult to simultaneously meet the severe requirements of an ultra-high voltage system on electrical performance, environmental adaptability, safety and environmental protection. Disclosure of Invention In view of the defects of the prior art route, the invention aims to provide a PVC sheath material for a semiconductive oil-resistant low-smoke low-halogen ultrahigh-voltage cable. In order to achieve the purpose, the invention provides a PVC sheath material for a semiconductive oil-resistant low-smoke low-halogen ultrahigh-voltage cable, which comprises the following raw material components in parts by weight: 100 parts of PVC resin; 35-55 parts of a composite plasticizer; 4-10 parts of a composite stabilizer; 25-35 parts of semiconductive filler; 8-20 parts of an oil-resistant modifier; 20-40 parts of low-smoke low-halogen flame-retardant synergist; 0.8-2.0 parts of lubricant; 0.3-1.0 parts of an antioxidant; 0.5-2.0 parts of silane coupling agent. Optimally, the PVC resin is a mixture of one or more components selected from the polymerization degree 1300 to 2500. Optimally, the composite plasticizer is a mixture of at least two components selected from DOTP, DPHP, TOTM and ESO, and the composite plasticizer is a mixture of DOTP, TOTM and epoxidized soybean oil according to the mass ratio of 1-2:1-2:0.5. Optimally, the composite stabilizer is a mixture of at least two components selected from calcium-zinc stabilizer, rare earth stabilizer and hydrotalcite. Optimally, the semiconductive filler is a mixture of one or more components selected from conductive carbon black, graphite and carbon nanotubes. Optimally, the oil-resistant modifier is a mixture of one or more selected from carboxylated nitrile rubber and maleic anhydride grafted SEBS. Optimally, the low-smoke low-halogen flame-retardant synergist is a mixture composed of one or more selected from aluminum hydroxide, magnesium hydroxide, zinc borate and ammonium octamolybdate. Optimally, the lubricant is a mixture of one or more selected from PE wax, stearic acid and oxidized polyethylene wax. Optimally, the antioxidant is a mixture of one or more components selected from antioxidant 1010 and antioxidant 168, and the silane coupling agent is a mixture of one or more components selected from KH-550, KH-560 and KH-570. The invention also aims to provide a preparation method of the PVC sheath material for the semiconductive oil-resistant low-smoke low-halogen ultrahigh-voltage cable, which comprises the following steps of: (a) Stirring and mixing the PVC resin, the composite stabilizer, the antioxidant, the silane coupling agent and the composite plasticizer according to the formula amount at the temperature of 80-95 ℃; (b) Adding the semiconductive filler, the oil-resistant modifier, the low-smoke low-halogen flame-retardant synergist and the lubricant in the formula amount into the product of the step (a), and heating to 100-120 ℃ for stirring and mixing; (c) And (C) adding the product obtained in the step (b) into a double-screw extruder for granulating, cooling, air-drying, screening and packaging, wherein the technological parameters of the double-screw extruder are 120-135 ℃ in a first area, 135-150 ℃ in a second area, 145-165 ℃ in a third area and 155-165 ℃ in a machine head. By applying the technical scheme, the PVC sheath material for the semiconductive oil-resistant low-smoke low-halogen ultrahigh-voltage cable has the advantages that (1) the semiconductive oil-resistant low-smoke low-halogen ultrahigh-voltage cable sheath material is semiconductive and controllable in volume resistiv