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Conductive crosslinked polyethylene composite material and preparation method thereof

A technology of cross-linked polyethylene and composite materials, which is applied in the field of conductive cross-linked polyethylene composite materials and its preparation, can solve the problems of easy fracture of carbon nanotubes, low conductive threshold, poor dispersion of carbon nanotubes, etc., and achieve industrialization Operation, high quality and high yield, and the effect of keeping the shape intact

Active Publication Date: 2020-06-09
ZHEJIANG ROTOUN PLASTIC TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The present invention aims to overcome the poor dispersion effect of carbon nanotubes in the prior art and the problems that carbon nanotubes are easily broken during processing, and provides a conductive cross-linked polyethylene composite material and a preparation method thereof, which improves the surface polarity of carbon nanotubes , so that it can be well dispersed in the co-crosslinking agent to form a relatively stable suspension, and a conductive cross-linked polyethylene composite material is obtained. The conductive threshold of the carbon nanotubes of the material can be as low as a ten-thousandth level, and the final preparation is Cross-linked polyethylene products with excellent mechanical properties

Method used

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  • Conductive crosslinked polyethylene composite material and preparation method thereof

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Comparison scheme
Effect test

Embodiment 1

[0034] The preparation method of the conductive cross-linked polyethylene composite material, the preparation process is carried out according to the following steps:

[0035] a) 0.05Kg single-walled carbon nanotubes, 1Kg neodecyl tert-amyl peroxide and 7.95Kg triallyl cyanurate were mixed, stirred at 50° C., and ultrasonically dispersed for 90 minutes; the diameter of the carbon nanotubes was 0.5-500nm, aspect ratio ≥ 100.

[0036] b) When the temperature of the system is lowered to 40°C, add 1Kg of peroxide B2,5-dimethyl-2,5-bis(tert-butylperoxy)hexane and stir for 3 minutes to prepare a suspension of carbon nanotubes;

[0037] c) Grinding the polyethylene into powder in a plastic mill, so that the particle size of the polyethylene powder is D95≤1mm;

[0038] d) Place 90Kg of polyethylene powder in a mixer equipped with a heating mantle, heat to 40°C, pour 10Kg of carbon nanotube suspension at 40°C, and keep stirring for 10 minutes to obtain the finished product.

[0039] ...

Embodiment 2

[0041] The preparation method of the conductive cross-linked polyethylene composite material, the preparation process is carried out according to the following steps:

[0042] a) Mix 0.1Kg single-walled carbon nanotubes, 1.0Kg isopropyl peroxydicarbonate, 0.2Kg ditetradecyl peroxydicarbonate, and 7.2Kg diallyl terephthalate at 54°C Stirring is carried out, and ultrasonic dispersion is carried out for 100 minutes at the same time; the diameter of carbon nanotubes is 0.5-500nm, and the aspect ratio is ≥100.

[0043] b) When the temperature of the system is lowered to 44° C., add 1.5 Kg of di-tert-amyl peroxide, and stir for 3.5 minutes to prepare a suspension of carbon nanotubes;

[0044] c) Grinding the polyethylene into powder in a plastic mill, so that the particle size of the polyethylene powder is D95≤1mm;

[0045]d) Place 92Kg of polyethylene powder in a mixer equipped with a heating mantle, heat to 45°C, pour 8Kg of carbon nanotube suspension at 45°C, keep stirring for 1...

Embodiment 3

[0048] The preparation method of the conductive cross-linked polyethylene composite material, the preparation process is carried out according to the following steps:

[0049] a) Mix 0.2Kg single-walled carbon nanotubes, 1.4Kg (2-ethylhexyl) peroxydicarbonate and 6.4Kg triallyl cyanurate, stir at 60°C, and ultrasonically disperse for 105min at the same time ; The carbon nanotube diameter is 0.5-500nm, and the aspect ratio is ≥100.

[0050] b) When the temperature of the system is lowered to 40-60°C, add 1Kg of tert-amyl peroxybenzoate and 1Kg of dicumyl peroxide, and stir for 4 minutes to prepare a suspension of carbon nanotubes;

[0051] c) Grinding the polyethylene into powder in a plastic mill, so that the particle size of the polyethylene powder is D95≤1mm;

[0052] d) Place 94Kg of polyethylene powder in a mixer equipped with a heating mantle, heat to 50°C, pour 6Kg of carbon nanotube suspension at 50°C, keep it warm and stir for 25min to obtain the finished product.

...

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Abstract

The invention relates to a modified polyethylene composite material. Aiming at the problems of poor carbon nanotube dispersion effect and easy breakage of carbon nanotubes in the processing process inthe prior art, the invention discloses a conductive crosslinked polyethylene composite material and a preparation method thereof, wherein the conductive crosslinked polyethylene composite material comprises the following components by the mass percentage: 90%-99% of polyethylene powder and 1%-10% of a carbon nanotube suspension. The preparation process comprises the following steps: mixing the carbon nanotubes, a peroxide A and an assistant crosslinking agent; adding a peroxide B to prepare a carbon nanotube suspension; grinding polyethylene into powder; and pouring a carbon nanotube suspension with the temperature of 40-60 DEG C into the polyethylene powder. The surface polarity of the carbon nanotubes is improved, so that the carbon nanotubes are well dispersed in the assistant crosslinking agent to form a relatively stable suspension, the conductive crosslinked polyethylene composite material is prepared, the conductive threshold of the carbon nanotubes of the material can be as low as ten thousandth, and finally, a crosslinked polyethylene product with excellent mechanical properties is prepared.

Description

technical field [0001] The invention relates to a modified polyethylene composite material, in particular to a conductive cross-linked polyethylene composite material and a preparation method thereof. Background technique [0002] Polyethylene (PE) cross-linking technology is one of the important means to improve its material performance. The cross-linked modified PE can greatly improve its performance, and only significantly improve the mechanical properties and environmental stress cracking resistance of PE. , chemical corrosion resistance, creep resistance and electrical properties and other comprehensive properties. Peroxide crosslinking and silane crosslinking are the current mainstream technologies in crosslinked polyethylene technology. Wherein, in the peroxide crosslinking system, the crosslinking agent and auxiliary crosslinking agent are added by twin-screw melt mixing (CN1247681C) or post-absorption method (CN104098727B) after mixing polyethylene. [0003] The t...

Claims

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Application Information

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IPC IPC(8): C08L23/06C08K3/04C08K5/14C08J3/24
CPCC08K3/041C08K5/14C08J3/24C08K2201/014C08K2201/011C08K2201/001C08K2201/003C08K2201/016C08J2323/06C08L23/06
Inventor 施海锋唐宇航温原
Owner ZHEJIANG ROTOUN PLASTIC TECH
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