Two-step method silane natural crosslinking overhead polyethylene insulation material and preparation method thereof

Abstract

The invention discloses a two-step method silane natural crosslinking overhead polyethylene insulation material and a preparation method thereof, wherein the two-step method silane natural crosslinking overhead polyethylene insulation material is prepared from the following raw materials in parts by weight: 85 to 95 parts of linear low density polyethylene, 50 to 60 parts of high density polyethylene, 2 to 6 parts of polypropylene, 10 to 15 parts of aluminum hydroxide, 1 to 3 parts of silane crosslinking agents, 0.5 to 2 parts of organic auxiliary agents, 1 to 2 parts of rheological agents, 1to 3 parts of complex antioxidants, 0.3 to 1 part of catalysts, 1 to 3 parts of copper ion inhibitors and 0.2 to 0.5 part of processing auxiliary agents. The produced insulation material achieves thegoals of effectively reducing the silane crosslinking time, reducing the energy consumption for cable plants, reducing the cost and effectively improving the production efficiency.

Description

technical field

[0001] The invention belongs to the field of cable materials, and in particular relates to a two-step silane natural cross-linked overhead polyethylene insulating material and a preparation method thereof. Background technique

[0002] Cross-linked polyethylene has the characteristics of high volume resistivity, low dielectric loss, good heat aging resistance, good stress crack resistance, easy processing, and low price. It is an excellent insulating material. At present, cross-linked polyethylene mainly has three methods: peroxide cross-linking, radiation cross-linking and silane cross-linking. Among them, silane crosslinked polyethylene is prepared by grafting or copolymerizing crosslinkable alkoxysilane into the main chain of polyethylene. Silane cross-linked polyethylene cables can be cured and cross-linked after being placed in warm water for several hours after extrusion. Since silane crosslinking does not require special crosslinking equipment, the p...

Examples

Embodiment 1

[0019] A two-step silane natural cross-linked overhead polyethylene insulating material, which consists of the following raw materials in parts by weight:

[0020] 85 parts of linear low-density polyethylene, 50 parts of high-density polyethylene, 2 parts of polypropylene, 10 parts of aluminum hydroxide, 1 part of silane crosslinking agent, 0.5 parts of organic additives, 1 part of rheological agent, and 1 part of composite antioxidant parts, catalyst 0.3 parts, anti-copper agent 1 part, processing aid 0.2 parts.

[0021] The preparation method of two-step method silane natural crosslinking overhead polyethylene insulating material comprises the following steps:

[0022] (1) Get each component in the above-mentioned raw material by weight, and mix evenly;

[0023] (2) kneading the raw materials obtained in the step (1) by a kneader;

[0024] (3) the raw material gained in the step (2) is dropped into a twin-screw extruder and extruded and granulated;

[0025] (4) The granul...

Embodiment 2

[0028] A two-step silane natural cross-linked overhead polyethylene insulating material, which consists of the following raw materials in parts by weight:

[0029] 90 parts of linear low-density polyethylene, 55 parts of high-density polyethylene, 4 parts of polypropylene, 13 parts of aluminum hydroxide, 2 parts of silane crosslinking agent, 1 part of organic additive, 1.5 parts of rheological agent, and 2 parts of composite antioxidant parts, catalyst 0.7 parts, anti-copper agent 2 parts, processing aid 0.35 parts.

Embodiment 3

[0031] A two-step silane natural cross-linked overhead polyethylene insulating material, which consists of the following raw materials in parts by weight:

[0032] 95 parts of linear low density polyethylene, 70 parts of high density polyethylene, 6 parts of polypropylene, 3 parts of silane crosslinking agent, 2 parts of organic auxiliary agent, 2 parts of rheological agent, 3 parts of composite antioxidant, 1 part of catalyst, 3 parts of anti-copper agent, 0.5 part of processing aid.

technical field

[0001] The invention belongs to the field of cable materials, and in particular relates to a two-step silane natural cross-linked overhead polyethylene insulating material and a preparation method thereof. Background technique

[0002] Cross-linked polyethylene has the characteristics of high volume resistivity, low dielectric loss, good heat aging resistance, good stress crack resistance, easy processing, and low price. It is an excellent insulating material. At present, cross-linked polyethylene mainly has three methods: peroxide cross-linking, radiation cross-linking and silane cross-linking. Among them, silane crosslinked polyethylene is prepared by grafting or copolymerizing crosslinkable alkoxysilane into the main chain of polyethylene. Silane cross-linked polyethylene cables can be cured and cross-linked after being placed in warm water for several hours after extrusion. Since silane crosslinking does not require special crosslinking equipment, the p...

Examples

Embodiment 1

[0019] A two-step silane natural cross-linked overhead polyethylene insulating material, which consists of the following raw materials in parts by weight:

[0020] 85 parts of linear low-density polyethylene, 50 parts of high-density polyethylene, 2 parts of polypropylene, 10 parts of aluminum hydroxide, 1 part of silane crosslinking agent, 0.5 parts of organic additives, 1 part of rheological agent, and 1 part of composite antioxidant parts, catalyst 0.3 parts, anti-copper agent 1 part, processing aid 0.2 parts.

[0021] The preparation method of two-step method silane natural crosslinking overhead polyethylene insulating material comprises the following steps:

[0022] (1) Get each component in the above-mentioned raw material by weight, and mix evenly;

[0023] (2) kneading the raw materials obtained in the step (1) by a kneader;

[0024] (3) the raw material gained in the step (2) is dropped into a twin-screw extruder and extruded and granulated;

[0025] (4) The granul...

Embodiment 2

[0028] A two-step silane natural cross-linked overhead polyethylene insulating material, which consists of the following raw materials in parts by weight:

[0029] 90 parts of linear low-density polyethylene, 55 parts of high-density polyethylene, 4 parts of polypropylene, 13 parts of aluminum hydroxide, 2 parts of silane crosslinking agent, 1 part of organic additive, 1.5 parts of rheological agent, and 2 parts of composite antioxidant parts, catalyst 0.7 parts, anti-copper agent 2 parts, processing aid 0.35 parts.

Embodiment 3

[0031] A two-step silane natural cross-linked overhead polyethylene insulating material, which consists of the following raw materials in parts by weight:

[0032] 95 parts of linear low density polyethylene, 70 parts of high density polyethylene, 6 parts of polypropylene, 3 parts of silane crosslinking agent, 2 parts of organic auxiliary agent, 2 parts of rheological agent, 3 parts of composite antioxidant, 1 part of catalyst, 3 parts of anti-copper agent, 0.5 part of processing aid.