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Insulating resin composition for direct-current power cable, crosslinked resin, direct-current power cable, member for forming insulating reinforcement layer of direct-current power cable junction, and direct-current power cable junction
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Problems solved by technology
[0005] However, for oil-filled insulated cables, regular maintenance such as a booster pump is required to keep the insulating oil in the cable, and the impact on the environment when the insulating oil flows out becomes a problem.
Method used
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preparation example Construction
[0078] As the preparation method of (B) component, low-density polyethylene, antioxidant, modified monomer, and organic peroxide are mixed in an extruder, heated, reacted, and granulated into granules. Feed or granular method.
[0079] It should be noted that the antioxidant used in the preparation of the (B) component is inactivated along with the synthesis of the (B) component, and does not constitute the (C) component in the resin composition.
[0080]
[0081] (C)component which comprises the resin composition of this invention is a stabilizer containing the mixture of 40 to 60 weight% of hindered phenolic antioxidants, and 60 to 40 weight% of thioether antioxidants.
[0082] The resin composition of this invention has favorable scorch resistance by containing the stabilizer which contains a thioether type antioxidant by the ratio mentioned later in the ratio of 40 mass % or more.
[0083] In addition, by setting the ratio of the thioether-based antioxidant in the stabi...
Embodiment
[0142] Hereinafter, the present invention will be described by way of examples.
[0143]
[0144] (1) MFR: Based on JIS K 7210, it was measured under the conditions of a measurement temperature of 190° C. and a load of 21.18 N.
[0145] (2) Density: Measured in accordance with JIS K 7112.
[0146] (3) Carbonyl content:
[0147] (3-1) Production of samples
[0148] The resin composition preheated at 120° C. and 1 MPa for 5 minutes was heated with a press machine at 180° C. and 15 MPa for 15 minutes to produce a crosslinked sheet (sheet-shaped crosslinked resin) with a thickness of about 0.2 mm. The thickness of the obtained crosslinked sheet was accurately measured with a micrometer.
[0149] (3-2) Determination of infrared absorption spectrum:
[0150] Infrared spectrophotometer "FT / IR-4200" (manufactured by JASCO Co., Ltd.) with 16 accumulation times and a resolution of 4cm -1 Under the condition of measuring 1790cm -1 Absorbance (baseline 1760 ~ 1840cm -1 ).
[0151]...
preparation example B1
[0177] According to the recipe shown in Table 1 below, 0.5 parts by mass of maleic anhydride and 0.05 parts by mass of hindered phenolic antioxidant were added to 100 parts by mass of low-density polyethylene (A2), and 2,5 - 0.02 parts by mass of dimethyl-2,5-bis(tert-butylperoxy) 3-hexyne "PERHEXYNE 25B" (manufactured by NOF Co., Ltd.), mixed in an extruder and heated to react, thereby A carbonyl content of 7.75×10 was obtained -5 mol / g of the modified polyethylene (B1) formed by the graft copolymer.
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Abstract
The purpose of the present invention is to provide an insulating resin composition for direct-current power cables which has excellent extrudability, is less apt to sag, has satisfactory scorch resistance, and has excellent extrusion stability and which can give insulating layers that generate little water by secondary decomposition and stably exhibit satisfactory direct-current electrical properties. The insulating resin composition for direct-current power cables of the present invention comprises: (A) low density polyethylene which has a complex viscosity [eta]*100, as measured at 130 DEG Cand a frequency of 100 rad / s, of 600-300 Pa.s and in which the ratio of the complex viscosity [eta]*0.1, as measured at 130 DEG C and a frequency of 0.1 rad / s, to the complex viscosity [eta]*100, [eta]*0.1 / [eta]*100, is 4 or higher; (B) a modified polyethylene; and (C) a stabilizer comprising a mixture of a hindered-phenol antioxidant and a thioether antioxidant. The resin composition contains carbonyl groups introduced thereinto by the component (B), in an amount of 7*10<-6> to 1.3*10<-5> mol / g with respect to the total mass of the components (A), (B), and (C).
Description
technical field [0001] The present invention relates to an insulating resin composition for DC power cables, a resin cross-linked body obtained by cross-linking the resin composition, a DC power cable having an insulating layer formed of the resin cross-linked body, and a DC power line A member for forming a reinforced insulation layer of a DC power cable connection part used when cables are connected, and a DC power cable connection part in which a reinforced insulation layer formed of a resin cross-linked body is formed. Background technique [0002] Conventionally, AC power transmission has been widely used as a method of transmitting electric power. [0003] However, since AC power transmission has a large power transmission loss in the case of long-distance power transmission, DC power transmission may be used for long-distance power transmission. [0004] As a cable (DC power cable) used in a DC power transmission form, an oil-filled insulated cable is widely used. ...
Claims
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