Thermoplastic polypropylene cable insulating material and preparation method thereof

Abstract

The invention relates to the technical field of insulating materials, in particular to a thermoplastic polypropylene cable insulating material and a preparation method thereof. The thermoplastic polypropylene material has high brittleness at room temperature so that the material is difficult to use as a cable insulating material; to solve this problem, the invention provides the thermoplastic polypropylene cable insulation material comprising, by weight, 50-60 parts of PP, 20-25 parts of LDPE and 20-25 parts of LLDPE. According to the invention, two polyethylene materials which are the LDPE and the LLDPE are added into a polypropylene matrix, so that the room-temperature brittleness of the polypropylene insulating material can be greatly improved, the application range of the polypropylenecable insulating material is greatly expanded, and the polypropylene cable insulating material has a good development prospect.

Description

technical field

[0001] The invention relates to the technical field of insulating materials, in particular to a thermoplastic polypropylene cable insulating material and a preparation method thereof. Background technique

[0002] At present, the most commonly used insulation material for DC plastic cables is cross-linked polyethylene. This material not only maintains the good electrical insulation properties of polyethylene, but also enhances the heat resistance of polyethylene. The cross-linking process also makes the ethylene molecules form a chain structure Transformed into a network structure, the mechanical properties of polyethylene at high temperatures have been greatly improved. However, the cross-linking process makes polyethylene change from a thermoplastic material to a thermosetting material, so it cannot be directly recycled after the cable life expires, and it does not have the characteristics of green environmental protection, and a large amount of waste XLPE ...

Examples

Embodiment 1

[0023] (1) Add 25 parts of LDPE and 25 parts of LLDPE into the torque rheometer, raise the temperature to 120°C, stir at 40rpm for 30min, keep the temperature at 120°C during stirring, and obtain the mixed material;

[0024] (2) Raise the temperature of the torque rheometer to 150°C, add 50 parts of pp to the mixed material in step (1), stir at 40 rpm for 30 minutes, keep the temperature at 150°C during stirring, and obtain thermoplasticity after stirring Polypropylene cable insulation.

Embodiment 2

[0026] (1) Add 22 parts of LDPE and 22 parts of LLDPE into the torque rheometer, raise the temperature to 120°C, stir at 40rpm for 30min, keep the temperature at 120°C during stirring, and obtain the mixed material;

[0027] (2) Raise the temperature of the torque rheometer to 150°C, add 56 parts of pp to the mixed material in step (1), stir at 40 rpm for 30 minutes, keep the temperature at 150°C during stirring, and obtain thermoplasticity after stirring Polypropylene cable insulation.

Embodiment 3

[0029] (1) Add 20 parts of LDPE and 20 parts of LLDPE into the torque rheometer, raise the temperature to 120°C, stir at 40rpm for 30min, keep the temperature at 120°C during stirring, and obtain the mixed material;

[0030] (2) Raise the temperature of the torque rheometer to 150°C, add 60 parts of pp to the mixed material in step (1), stir at 40 rpm for 30 minutes, keep the temperature at 150°C during stirring, and obtain thermoplasticity after stirring Polypropylene cable insulation.

technical field

[0001] The invention relates to the technical field of insulating materials, in particular to a thermoplastic polypropylene cable insulating material and a preparation method thereof. Background technique

[0002] At present, the most commonly used insulation material for DC plastic cables is cross-linked polyethylene. This material not only maintains the good electrical insulation properties of polyethylene, but also enhances the heat resistance of polyethylene. The cross-linking process also makes the ethylene molecules form a chain structure Transformed into a network structure, the mechanical properties of polyethylene at high temperatures have been greatly improved. However, the cross-linking process makes polyethylene change from a thermoplastic material to a thermosetting material, so it cannot be directly recycled after the cable life expires, and it does not have the characteristics of green environmental protection, and a large amount of waste XLPE ...

Examples

Embodiment 1

[0023] (1) Add 25 parts of LDPE and 25 parts of LLDPE into the torque rheometer, raise the temperature to 120°C, stir at 40rpm for 30min, keep the temperature at 120°C during stirring, and obtain the mixed material;

[0024] (2) Raise the temperature of the torque rheometer to 150°C, add 50 parts of pp to the mixed material in step (1), stir at 40 rpm for 30 minutes, keep the temperature at 150°C during stirring, and obtain thermoplasticity after stirring Polypropylene cable insulation.

Embodiment 2

[0026] (1) Add 22 parts of LDPE and 22 parts of LLDPE into the torque rheometer, raise the temperature to 120°C, stir at 40rpm for 30min, keep the temperature at 120°C during stirring, and obtain the mixed material;

[0027] (2) Raise the temperature of the torque rheometer to 150°C, add 56 parts of pp to the mixed material in step (1), stir at 40 rpm for 30 minutes, keep the temperature at 150°C during stirring, and obtain thermoplasticity after stirring Polypropylene cable insulation.

Embodiment 3

[0029] (1) Add 20 parts of LDPE and 20 parts of LLDPE into the torque rheometer, raise the temperature to 120°C, stir at 40rpm for 30min, keep the temperature at 120°C during stirring, and obtain the mixed material;

[0030] (2) Raise the temperature of the torque rheometer to 150°C, add 60 parts of pp to the mixed material in step (1), stir at 40 rpm for 30 minutes, keep the temperature at 150°C during stirring, and obtain thermoplasticity after stirring Polypropylene cable insulation.