Novel preparation method of organosilane crosslinked polyethylene cable material

Abstract

The invention discloses a novel preparation method of an organosilane crosslinked polyethylene cable material, which comprises the following steps: adding polyethylene, an initiator and a grafting agent into a kneading machine, and kneading for 5-10 min, so that a grafted masterbatch is obtained; adding low-density polyethylene, a catalyst and an antioxidant into the kneading machine, and kneading for 3-8 min, so that a catalyst masterbatch is obtained; mixing the grafted masterbatch with the catalyst masterbatch, and extruding and granulating the obtained mixture so as to obtain an organosilane crosslinked polyethylene cable masterbatch; and putting the organosilane crosslinked polyethylene cable masterbatch into a confined space in which a moderate amount of water is added, putting the confined space to illuminate in the sunlight in the daytime, and 2-7 days later, drying the obtained object, so that the organosilane crosslinked polyethylene cable material is obtained. The preparation method of an organosilane crosslinked polyethylene cable material provided by the invention is simple in operation and low in cost, and can achieve over 80% of crosslinking.

Description

Technical field: [0001] The invention relates to the technical field of cables, in particular to a preparation method of a novel silane crosslinked polyethylene cable material. Background technique: [0002] The main disadvantages of polyethylene for wire and cable insulation materials are poor temperature resistance, flammability, and poor aging resistance. In order to improve the overall performance of insulating materials and improve the service life of insulating materials, polyolefin insulation Cross-linking occurs for better properties. [0003] At present, polyethylene crosslinking methods mainly include chemical crosslinking, radiation crosslinking and silane crosslinking. The chemical cross-linking method uses organic peroxide as the cross-linking agent. Due to the strict temperature and pressure control required in the cross-linking process and the high requirements for equipment, it brings technical difficulties; irradiation cross-linking is The disadvantages of...

AI Technical Summary

Problems solved by technology

The chemical cross-linking method uses organic peroxide as the cross-linking agent. Due to the strict temperature and pressure control required in the cross-linking process and the high requirements for equipment, it brings technical difficulties; irradiation cross-linking is The disadvantages of high-energy radiation cross-linking are high equipment cost, complicated safety protection issues, and large loss of material properties; silane cross-linking is an important cross-linking method that combines low investment, strong adaptability and simple process, and is widely used. use

At present, the cross-linking and curing reaction of silane cross-linked cable materials can only be completed by boiling the cable materials in warm water at 90°C or in a steam sauna for 6-10 hours. The equipment investment is large and the cost is high.

[0004] Chinese patent (CN201010615392.4) discloses a natural cross-linking method for silane cross-linked polyethylene insulation. The insulating wire core extruded with silane cross-linked polyethylene insulation is placed in a transparent airtight space containing an appropriate amount of water. The material is composed of white transparent inorganic glass, plexiglass or film. This method can reduce the production cost very well and can achieve a good cross-linking effect, but the cross-linking time is relatively long, which is not suitable for large-scale production and takes a long time. Soaking the insulating core with water for a long time may cause it to enter water; Chinese patent (201010160160.4) discloses a silane rapid cross-linking polyethylene cable material. Soaking to achieve a good cross-linking effect, but the addition of cross-linking activators not only increases the production cost, but also affects the mechanical properties of polyethylene

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