Silane cross-linked polyethylene insulating material and production method thereof

Abstract

The invention provides a silane cross-linked polyethylene insulating material composition, which comprises a material A and a material B, wherein the material A is composed of the following components in parts by weight: 100 parts of polyethylene, 0.01-1 parts of initiator, 0.2-5 parts of silane cross-linking agent, and 0.1-0.5 parts of antioxidant; the material B is composed of the following components in parts by weight: 100 parts of polyethylene, 0.5-5 parts of catalyst, 0.01-5 parts of processing aid, and 0.1-0.5 parts of antioxidant; and the material A is mixed and extruded by a reciprocating single-screw extruder.

Description

technical field [0001] The invention relates to a silane-crosslinked polyethylene insulating material and a production method, in particular to a cross-linked polyethylene insulating material with a high silane grafting rate and a production method. Material A in the composition involves the use of reciprocating single-screw extrusion Machine production granulation, mainly used in the production method of 10KV and below power cable insulation layer, belongs to the field of production technology of cable materials. Background technique [0002] Polyethylene is a commonly used insulating material in wire and cable, but due to its structural characteristics, it cannot be used at higher temperatures, and its resistance to environmental stress cracking is also poor, so it cannot have a wider application field; In order to improve the high temperature resistance, environmental stress cracking resistance and mechanical properties of polyethylene, the best way is to modify it; one o...

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Problems solved by technology

[0005] The existing silane cross-linked polyethylene A material is produced using a twin-screw extruder. Because its screw thread is continuous, it can only move radially instead of axially. The mixing of polyethylene occurs in the radial direction, so the silane The dispersion of crosslinking agent and initiator, and the shearing effect of the melt are not ideal. At the same time, because the thread is continuous, the pressure acting on polyethylene is very high, and the energy consumption of the corresponding equipment is also increased.

[0006] The traditional two-step method to produce silane cross-linked polyethylene has the following disadvantages: 1. The silane grafting process has side reactions of peroxide cross-linking, and the graft A material has poor fluidity and is not easy to process; 2. Silane cross-linked polyethylene needs to be Complete hydrolysis and cross-linking in hot water bath or water vapor, water molecules are polar, while polyethylene is non-polar, the diffusion speed is slow, and the time required for hydrolysis and cross-linking is longer; 3. The production of material A adopts twin-screw extrusion After granulation, the dispersing effect of silane crosslinking agent and initiator is poor, and the thread is continuous, which exerts a great pressure on polyethylene, and the energy consumption of corresponding equipment also increases

[0007] In summary, this field lacks a polyethylene insulating material with high silane crosslinking degree, heat resistance, aging performance and processing performance, and lacks a polyethylene insulating material that can increase the silane crosslinking degree and make the processing technology very convenient and flexible. Preparation method of polyethylene insulating material with easy operation

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