Crosslinkable polyethylene composition and application thereof, crosslinked polyethylene and preparation method and application thereof

Abstract

The invention relates to the field of polyolefin, and discloses a crosslinkable polyethylene composition and application thereof, crosslinked polyethylene and a preparation method and application thereof. The composition comprises polyethylene, a peroxide cross-linking agent and an assistant cross-linking agent, relative to 100 parts by weight of polyethylene, the dosage of the peroxide cross-linking agent is 0.05-2 parts by weight; the use amount of the assistant crosslinking agent is 0.05-2 parts by weight; the assistant crosslinker has a structure as shown in a formula I, wherein Rn1R2 (6-n) Si2O is shown in the formula I; wherein in the formula I, R1 is alkenyl of C2-C5, R2 is methyl, ethyl, methoxyl or ethoxyl, and n is an integer of 1-6. The composition has high high-temperature creep resistance, crosslinking degree and-20 DEG C notch impact property, and the odor of a crosslinked polyethylene product prepared from the composition is remarkably reduced.

Description

technical field [0001] The invention relates to the field of polyolefins, in particular to a cross-linkable polyethylene composition and application thereof, cross-linked polyethylene and a preparation method and application thereof. Background technique [0002] Compared with non-crosslinked polyethylene, crosslinked polyethylene has excellent mechanical properties, environmental cracking resistance and high temperature creep resistance, which is mainly due to the transformation of linear thermoplastic polyethylene macromolecular chains into Reticulated thermoset macromolecular material. The performance of cross-linked polyethylene products is not only related to the structure and molding process of polyethylene, but also the degree of cross-linking is the main factor affecting the performance of cross-linked polyethylene products. The higher the degree of cross-linking of cross-linked polyethylene, the more perfect the cross-linked network is, and the better the performan...

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Problems solved by technology

[0009] The purpose of the present invention is to provide a cross-linkable polyethylene composition to overcome the problems in the prior art that the preparation of cross-linked polyethylene has a large odor and high-temperature creep resistance, cross-linking degree and notched impact performance at minus 20°C And its application, cross-linked polyethylene and its preparation method and application, the cross-linkable polyethylene composition comprises peroxide cross-linking agent and auxiliary cross-linking agent shown in formula I, thus can significantly improve the resistance of the composition High-temperature creep performance, cross-linking degree and notched impact performance at minus 20°C, and significantly reduce the odor of cross-linked polyethylene products made from the composition

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