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Shaft diameter bidirectional conductivity controllable conductive polymer tube and preparation method thereof

A conductive polymer and polymer tube technology, which is applied in the field of axial-diameter bidirectional conductivity controllable conductive polymer tube and its preparation field, can solve the problem of a large amount of conductive filler added, and achieve high-quality competitive advantages, simple regulation, and permeability. The effect of a low threshold

Active Publication Date: 2020-10-16
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The object of the present invention is to provide a conductive polymer tube with controllable shaft diameter bidirectional conductivity and its preparation method in view of the shortcomings of insufficient processing technology and large amount of conductive fillers in the prior art.

Method used

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  • Shaft diameter bidirectional conductivity controllable conductive polymer tube and preparation method thereof
  • Shaft diameter bidirectional conductivity controllable conductive polymer tube and preparation method thereof
  • Shaft diameter bidirectional conductivity controllable conductive polymer tube and preparation method thereof

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preparation example Construction

[0038] Therefore, the present invention provides a method for preparing a conductive polymer tube with controllable axial bidirectional conductivity, comprising the following steps: uniformly mixing 50-99.99 parts by weight of polymer with 0.01-50 parts by weight of conductive filler, and then mixing the mixture Put it in a polymer tube rotary extrusion device and carry out melt rotary extrusion at a speed of 1-60rpm / min, and the extruded tube blank can be cooled and sized under the traction of the tractor; the rotation is the relative The die rotates independently, the die rotates independently relative to the mandrel, the mandrel and the die rotate in the same direction at the same time, or the mandrel and the die rotate in opposite directions at the same time. Here, the polymer and the conductive filler can also be melt-extruded by a conventional method, pelletized, and put into a polymer tube rotary extrusion device.

[0039] Preferably, the rotation is reverse rotation of...

Embodiment 1

[0055] First, 99.99 parts by weight of polyethylene LDPE (brand: 2420H) and 0.01 parts by weight of carbon nanotubes are melt-extruded and pelletized in a twin-screw extruder, and then the obtained pellets are placed in a polymer tube rotary extrusion device. The mandrel is rotated independently, and the rotational speed of 10rpm / min is melted and rotated for extrusion, and the extruded tube blank is cooled and sized under the traction of the tractor to obtain a polymer tube with a diameter of ￠3.

[0056] The axial conductivity of the pipe obtained in this embodiment is 1.92×10 -3 S / cm, the radial conductivity is 1.5×10 -11 S / cm.

Embodiment 2

[0058] First, 99.9 parts by weight of polyethylene LDPE (brand: 2420H) and 0.1 parts by weight of graphene are melt-extruded and pelletized in a twin-screw extruder, and then the obtained pellets are placed in a polymer tube rotary extrusion device. The die is rotated separately, melted and rotated at a speed of 20 rpm / min, and the extruded tube blank is cooled and sized under the traction of a tractor to obtain a polymer tube with a diameter of ￠3.

[0059] The axial conductivity of the pipe obtained in this embodiment is 3.92×10 -2 S / cm, the radial conductivity is 4.2×10 -11 S / cm.

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Abstract

The invention belongs to the technical field of conductive polymers, and specifically relates to a conductive polymer tube with controllable axial conductivity and radial conductivity, and a preparation method thereof. The technical problem to be solved by the invention is to provide a preparation method for a conductive polymer tube with controllable axial conductivity and radial conductivity. The preparation method comprises the following steps: uniformly mixing a polymer with a conductive filler, then placing the mixture in a rotary extrusion device for the polymer tube and carrying out rotary melting extrusion, and cooling and sizing the extruded tube blank. The method disclosed by the invention is capable of inducing the one-dimensional orientation of the conductive filler to be changed into multi-dimensional orientation in a tube wall, and promoting to form a conductive network; and meanwhile, a hybridized conductive filler system with a higher connection degree is formed by virtue of the different shape response of the multi-dimensional conductive filler in a rotary flow field, so that the percolation threshold value of the conductive polymer tube is greatly lowered, the dosage of the expensive conductive filler is reduced, and the conductive polymer tube with high conductivity and excellent machinability and mechanical property is prepared.

Description

technical field [0001] The invention belongs to the technical field of conductive polymer materials, and in particular relates to a conductive polymer tube with controllable shaft-diameter bidirectional conductivity and a preparation method thereof. Background technique [0002] Conductive polymer is a composite material that realizes the conductive properties of the polymer by adding one or more conductive fillers, and has very broad application prospects in the fields of antistatic, electromagnetic shielding, sensors and conductors. Conductive polymer tube is a kind of special conductive material with high added value and special purpose, especially the microtube with a diameter of less than 5mm. Its special shape has important applications in flexible sensors and medical and health fields, and it has gradually attracted the attention of academic and industrial circles. (US4278835A). However, it is very difficult to maintain the conductive properties of the polymer materi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29C48/33B29C48/90C08L23/06C08L23/12C08L23/20C08K7/24C08K3/04C08K7/06C08K3/08
CPCB29C48/30B29C48/33B29C48/90C08K3/04C08K3/08C08K7/06C08K7/24C08K2003/0856C08K2201/011C08L23/06C08L23/12
Inventor 白时兵聂敏李怡俊王琪
Owner SICHUAN UNIV
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