Crosslinkable polyethylene composition, preparation method and application thereof, crosslinked polyethylene and application of crosslinked polyethylene
A technology of cross-linked polyethylene and composition, which is applied in the field of polyolefins, can solve the problem that the space charge performance of DC breakdown strength cannot meet the demand, and achieve the effect of improving long-term operation stability and prolonging service life
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[0056] The second aspect of the present invention provides a kind of preparation method of above-mentioned crosslinkable polyethylene composition, wherein, described preparation method comprises the following steps:
[0057] (1) mixing, extruding, and granulating polyethylene, at least one phosphorus-containing additive and at least one nitrogen-containing additive to obtain primary mixed particles;
[0058] (2) After mixing the primary mixed particles and the cross-linking agent, the cross-linking agent is subjected to post-absorption treatment to obtain the cross-linkable polyethylene composition.
[0059] According to the invention, the extrusion is carried out in a twin-screw extruder.
[0060] According to the present invention, the screw aspect ratio of the twin-screw extruder is 10-100, and the extrusion temperature is 110-220°C.
[0061] According to the present invention, the conditions for post-absorption treatment of the crosslinking agent include: post-absorption ...
Embodiment 1-6 and comparative example 1-6
[0090] The polyethylene, at least one phosphorus-containing auxiliary agent and at least one nitrogen-containing auxiliary agent are firstly mixed, melted, blended, extruded and granulated by a twin-screw extruder to obtain primary mixed particles. Then mix the primary mixed particles with the peroxide cross-linking agent and put them into a round-bottomed flask of a rotary evaporator for post-absorption of the cross-linking agent. The post-absorption temperature is 70°C, and the post-absorption time is 24 hours. Completion of the post-absorption process results in cross-linkable XLPE pellets. The formulation of the crosslinkable insulating polyolefin composition is shown in Table 1 and Table 2.
[0091] The XLPE pellets were cross-linked in a flat tablet press to obtain flakes with a diameter of 15 cm and a thickness of 0.2 mm. Place the thin slice sample in an oven at 70°C for 24 hours to degas to obtain the final sample slice. Wherein, the screw aspect ratio of the twin-...
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