Ultraviolet irradiation cross-linked polyolefin material and preparation method thereof

Abstract

The invention discloses an ultraviolet light irradiation cross-linked polyolefin material, which comprises the following components by weight: 40-60 parts of polyolefin; 1-5 parts of a first photoinitiator; 5-15 parts of a bonding agent; 20-30 parts of a polymer precursor; 0.1-1 part of a second photoinitiator; 0.1-1 part of a cross-linking agent; 1-3 parts of a silane coupling agent; and 0.01-0.1 part of a light stabilizer. After the first photoinitiator and the second photoinitiator are irradiated by ultraviolet rays, free radicals are generated, so that polyolefin is crosslinked again. Meanwhile, the polymer precursor is subjected to a cross-linking reaction under the action of the cross-linking agent, and a part of polyolefin and a part of the polymer precursor are also subjected to a cross-linking reaction, so that a relatively complex cross-linked polymer is formed. Due to the action of the light stabilizer, the reaction is terminated, and the degradation reaction of the material is avoided, so that better high-temperature resistance of the material is ensured.

Description

technical field [0001] The invention relates to the technical field of polyolefins, in particular to an ultraviolet light irradiation crosslinked polyolefin material and a preparation method thereof. Background technique [0002] Polyethylene is a general-purpose thermoplastic polymer material with the largest output and the widest application among polymer materials, and it plays an increasingly important role in national economic construction and daily life. However, the use temperature of polyethylene materials is very limited. It is easy to deform at high temperature, and even loses its mechanical strength and cannot be used. Therefore, it is cross-linked and modified by appropriate methods to make it a thermosetting material capable of high temperature resistance, so as to improve its use value. [0003] There are three main cross-linking methods of polyethylene: high-energy radiation cross-linking, chemical cross-linking and ultraviolet light cross-linking. The high-e...

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Problems solved by technology

[0004] At present, the ultraviolet light cross-linking method is the latest cross-linking method used to form a cross-linked structure of polyethylene, but the cross-linking is only formed by the direct compounding of two macromolecular free radicals. Due to the poor activity of the macromolecular chains, the two macromolecular The probability of molecular free radical collision is low, which makes the uniformity of crosslinking poor, resulting in poor high temperature resistance. In addition, during the photocrosslinking process of polyethylene, high-intensity ultraviolet radiation causes damage to the surface of polyethylene A certain degree of photooxidative damage, with the increase of the light time, the degree of oxidation also increases, which will lead to the degradation reaction of polyethylene and make its stability worse

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