Insulating resin composition for DC power cable, crosslinked resin body, DC power cable, member for forming reinforcing insulating layer of DC power joint, and DC power cable joint

• Main Authors: Yuzawa, Nobutaka, Shigemori, Saki, Mohri, Hironori, Tachikawa, Takeshi, Aso, Anna, Mori, Hiroki, Shigemori, Naoto
• Format: Patent
• Language: English
• Published: 25.08.2020
• Subjects: BASIC ELECTRIC ELEMENTS; CABLES; CHEMISTRY; COMPOSITIONS BASED THEREON; COMPOSITIONS OF MACROMOLECULAR COMPOUNDS; CONDUCTORS; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; ELECTRICITY; GENERATION; INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINEDOPTICAL AND ELECTRIC CABLES OR LINES; INSULATORS; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING ORDIELECTRIC PROPERTIES; THEIR PREPARATION OR CHEMICAL WORKING-UP

An insulating resin composition for a DC power cable improves DC electrical properties and extrusion stability, and includes (A) a low-density polyethylene having a complex viscosity η*100, which is measured at 130° C. and a frequency of 100 rad/s, of 600 to 1,300 Pa·s, wherein a ratio (η*0.1/η*100) of a complex viscosity η*0.1, which is measured at 130° C. and a frequency of 0.1 rad/s, to the complex viscosity η*100 is 4 or more; (B) a modified polyethylene; and (C) a stabilizer including a mixture of a hindered phenol antioxidant and a thioether antioxidant. The amount of carbonyl groups introduced into the resin composition through the component (B) is 7×10−6 to 1.3×10−5 mol/g relative to the total mass of the component (A), the component (B), and the component (C).