One-step silane cross-linked polyethylene cable material

Abstract

The invention discloses a one-step silane cross-linked polyethylene cable material, which belongs to the technical field of electric wire and cable materials. The cable material is characterized in that a base material consists of 40 to 85 parts of low density polyethylene (LDPE) and 15 to 60 parts of linear low density polyethylene (LLDPE); the master batch of a catalyst consists of 100 parts of low density polyethylene (LDPE) which is one polyethylene or a mixture of more polyethylenes, 1 to 10 parts of antioxidant, 1 to 10 parts of copper resisting agent and 1 to 10 parts of catalyst; a silane cross-linked compounding agent consists of 100 parts of silane and 10 to 50 parts of initiator; and all the raw materials are mixed uniformly. Compared with the traditional two-step method, the cable material has the advantages that: materials A and B are not distinguished, all the raw materials are mixed together by a special method according to proportion, and a cable factory can directly finish grafting and extruding a cable insulating wire core in one step at the same time in an extruder or a common extruder; and the cable material saves the operation of mixing the materials A and B before extruding in the two-step method, and has simple process, low equipment investment, stable performance and long storage period.

Description

technical field [0001] The invention belongs to the technical field of wire and cable materials, and relates to a one-step silane crosslinked polyethylene cable material with simple process. Background technique [0002] Cross-linked polyethylene has gradually replaced polyvinyl chloride (PVC) due to its excellent performance, and has become the main material for cable insulation. Among cross-linked polyethylene, silane cross-linking, which has simple cable manufacturing process, less restrictions on production cross-section and length, less cable waste, low investment in production equipment, and convenient operation, has become the first choice. Silane crosslinking can improve the strength and heat resistance of polyethylene, and the service temperature is increased from 70°C to 90°C, so it is widely used in cable insulation materials of 10KV and below. At present, there are two kinds of silane cross-linked cable materials: two-step method and one-step method, but the pro...

AI Technical Summary

Problems solved by technology

At present, there are two kinds of silane cross-linked cable materials: two-step method and one-step method, but the production process of the traditional two-step silane cross-linked polyethylene cable material is complicated and time-consuming. Materials A and B need to be granulated separately, so the energy consumption is large. , the silane in component A has been grafted on the polyethylene molecular chain, so it is highly active and should not be stored for a long time

The one-step method is to continuously add polyethylene, silane and other additives in the continuous extrusion process, mix all raw materials, complete the initiation and grafting process, and continuously make shaped products. The technology is advanced, but the investment in equipment is relatively large.