Polyolefin resin composition, preparation method thereof, insulating material for cable, cable

Abstract

The invention provides a polyolefin resin composite, a preparation method thereof, an insulation material used for a cable, and the cable. The polyolefin resin composite is prepared from the following ingredients: 100 parts by weight of polyolefin, 0.02 to 0.9 part by weight of antioxygen, 1to 10 parts by weight of coupling reagent, 0.5 to 3 parts by weight of initiator and 0.7 to 3 parts by weight of lactam ring compound and / or anhydride compound. The polyolefin resin composite disclosed by the invention conforms to various requirements about the cable in the national standard, insulation thermal shrinkage is especially greatly improved, and a conductor cannot be exposed in air so as to avoid accidental situations including electric leakage, short circuit, fire hazards or electric shock of people and the like. In addition, the preparation method of the polyolefin resin composite is simple and easy in operation and control.

Description

technical field [0001] The invention relates to a polyolefin resin composition, a preparation method thereof, an insulating material for cables, and cables, and belongs to the field of insulating materials. Background technique [0002] There are currently three main industrial silane crosslinked polyolefin processes: two-step production process (also known as SioplasE), one-step production process (also known as MonosilR) and olefin-based silane copolymer process. After polyolefin is cross-linked by silane, its mechanical properties, heat resistance, chemical resistance, and stress cracking resistance are greatly improved, which broadens the scope of application, such as in the insulation of medium and low voltage wires and cables . [0003] In recent years, it has been found on polyolefin cables cross-linked by the silane method that the insulation heat shrinkage performance of the cable is poor. It is difficult for the insulation heat shrinkage rate to meet the requirem...

AI Technical Summary

Problems solved by technology

However, increasing the melting temperature must increase the temperature of the equipment, which will cause scorching of polyolefin during pre-crosslinking, and also have a certain impact on the life of the equipment

To reduce the cooling rate, it is necessary to adopt a slow cooling process and warm water for segmental cooling during extrusion, especially in winter when the ambient temperature is low, and the conductor needs to be properly preheated, which greatly increases the production cost

[0005] In addition, the use of an extrusion die is also a very important method to improve thermal shrinkage, but the internal pressure of the extrusion die itself is relatively high, which causes the extrusion expansion effect of the material to be amplified during the extrusion process, which affects the surface of the cable. It has a great influence, which reduces the surface quality; at the same time, the inability of the extrusion die to produce refractory cables wrapped with mica tape has also become a limiting factor for its promotion

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