High polymer-based graphene composite material with positive resistance temperature coefficient and preparation method

A technology of temperature coefficient and composite materials, which is applied in the field of polymer-based composite materials and its preparation, can solve the problems of consuming a large amount of solvents, low production efficiency, and long time consumption

Inactive Publication Date: 2012-07-04
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The solution blending process consumes a large amount of...

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Raw materials are configured according to the following proportions: LDPE is 88.6wt%, single-layer graphene is 1.2wt%, coupling agent titanate is 1.2wt%, crosslinking accelerator triallyl isocyanurate is 1wt%, dispersed The agent is 8wt%. The mixed materials were carried out in an internal mixer, and mixed for 0.5 hours at 180°C. The mixed material was put into a steel sheet mold, and pressurized and vulcanized by a flat vulcanizer at 190°C and 4.8MPa to make a sheet of 300×180×0.25mm. The composite sheet was dried at 80°C for 2 h, and the Co 60 Electron beam irradiation treatment is carried out for the irradiation source, and the irradiation dose is 220kGy. The room temperature resistivity of the obtained composite material was measured to be 38.2 Ω·cm, the PTC strength was 7.4, and the resistivity did not change significantly after more than 100 cycles.

Embodiment 2

[0028] Raw materials are configured according to the following ratio: LDPE is 40wt%, PP is 44.6wt%, 10-layer graphene is 0.8wt%, carbon nanotube is 0.6wt%, dispersant is 11wt%, phenolic antioxidant 1010 is 1.8%, The coupling agent titanate is 1.2wt%, and the guanidine crosslinking accelerator is 1wt%. The mixed material was stirred and mixed in a high-speed mixer at room temperature for 1 hour. The obtained material was extruded by an injection molding machine to prepare a sheet with a size of 80×65×0.8 mm, and the extrusion temperature was 180° C. The composite sheet was dried at 80 °C for 4 h, and the Co 60 Electron beam irradiation treatment is carried out for the irradiation source, and the irradiation dose is 160kGy. The room temperature resistivity of the obtained composite material was measured to be 38.2 Ω·cm, the PTC strength was 7.4, and the resistivity did not change significantly after more than 100 cycles.

Embodiment 3

[0030] Raw materials are configured according to the following proportions: PVDF is 50wt%, HDPE is 41.3wt%, 2-4 layers of graphene oxide is 1wt%, coupling agent titanate is 0.9wt%, dispersant is 5wt%, amine antioxidant BHT is 1.8%. The mixed materials were stirred and mixed for 1 hour in a high-speed mixer at room temperature. The obtained material was extruded by an injection molding machine to prepare a sheet with a size of 80×65×0.8 mm, and the extrusion temperature was 230° C. The composite sheet was dried at 90°C for 2 hours, and then irradiated with electron beams on a linear accelerator with a dose of 193kGy. The measured room temperature resistivity of the obtained composite material is 44.7Ω·cm, the PTC strength is 7.1, and the resistivity does not change significantly after more than 100 cycles.

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Abstract

The invention relates to a high polymer-based graphene composite material with positive resistance temperature coefficient, and a preparation method of the material. The composite material comprises a base body and conductive filler; the content of conductive material is 0.01-10wt%; all components are mixed uniformly and are formed through mold-pressing or extrusion/injection molding; and the formed material is irradiated after being dried, so that the high polymer-based graphene composite material with positive resistance temperature coefficient can be obtained. Compared with the prior art, the graphene composite material and the preparation method have the advantages that the manufacturing process is simple, less influence is caused to the performance of base material, oxidation is unlikely to occur, the resistivity is more stable, the circulation stability of the material is better, and NTC (Negative Temperature Coefficient) effect is not generated easily.

Description

technical field [0001] The invention relates to a polymer-based composite material and a preparation method thereof, in particular to a polymer-based graphene composite material with a positive temperature coefficient of resistance and a preparation method thereof. Background technique [0002] Positive temperature coefficient of resistance (PTC) materials are a class of heat-sensitive materials with a positive temperature coefficient. Its resistivity has a high correlation with temperature, and within a narrow temperature range, the resistivity of the material will increase sharply by 1 to 8 orders of magnitude as the temperature rises. The temperature threshold at which the conductivity changes drastically is called the Curie temperature Tc. That is to say, for PTC materials, materials below Tc exhibit semiconductor properties, while materials above Tc exhibit insulator properties. Taking advantage of this characteristic, PTC materials can be used in self-temperature-con...

Claims

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Application Information

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IPC IPC(8): C08L23/06C08L23/12C08L27/16C08K3/04C08K7/00C08K7/06
Inventor 李华刘河洲见雪珍陶文燕王珮
Owner SHANGHAI JIAO TONG UNIV
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