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Polymer conductive composite material with stable volume resistivity under temperature changes and preparation method thereof

A conductive composite material and volume resistivity technology, which is applied to conductive materials dispersed in non-conductive inorganic materials and other directions to achieve the effects of reducing PTC effect, simple preparation method and process, and stabilizing volume resistivity

Inactive Publication Date: 2012-08-22
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] At present, most of the conductive shielding composite materials used in China cannot meet the requirements of maintaining a relatively stable volume resistivity under variable temperatures.

Method used

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  • Polymer conductive composite material with stable volume resistivity under temperature changes and preparation method thereof
  • Polymer conductive composite material with stable volume resistivity under temperature changes and preparation method thereof
  • Polymer conductive composite material with stable volume resistivity under temperature changes and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] 1) Add 5gMWNT into 200mL xylene, heat up to 70°C after ultrasonication for 30 minutes at room temperature, add 45g ethylene-ethyl acrylate copolymer EEA, stir for 30min under condensing reflux; add 100mL absolute ethanol, filter; After drying at 90°C for 24 hours, it was shredded to obtain a premix with 10% MWNT content;

[0034] 2) Mix 7.5g of the premix and 21.1g of EEA in a Haake rheometer at 120°C and 60r / m for 30min; after heating up to 140°C, add 16gCB, 4g of polyethylene wax, 0.4g of antioxidant 1010, After mixing at / m for 8 minutes, cut into pieces and granulate;

[0035] 3) Mix the mixture in the previous step with the crosslinking agent DCP at a ratio of 49:1, and mix it on the open mill at 100°C for 6 minutes; then crosslink it on a flat vulcanizer at 180°C, 20MPa, and press for 12 minutes, and hold the pressure Cool to normal temperature to obtain a composite material. The schematic diagram of the conductive network inside the composite material is shown ...

Embodiment 2

[0037] 1) Mix 2.5g of graphene sheet GNP and 25.1g of EVA in a Haake rheometer at 120°C and 60r / m for 30min; after heating up to 140°C, add 17.5g of CB, 4g of polyethylene wax, and 0.4g of antioxidant 1010 , mixed at 45r / m for 8 minutes, then cut into pieces and granulated;

[0038] 2) Mix the mixture of the previous step and the cross-linking agent DCP at a ratio of 99:1, and mix it on an open mill at 100°C for 6 minutes; then cross-link it on a flat vulcanizer at 180°C, 20MPa, and press for 12 minutes, and hold the pressure Cool to normal temperature to obtain a composite material. The schematic diagram of the conductive network inside the composite material is shown in figure 2 , the volume resistivity curve of the obtained composite material as a function of temperature is as follows Figure 4 The curve in 2.

Embodiment 3

[0040] 1) Add 5g of carbon nanofiber CNF into 200mL of xylene, heat up to 70°C after ultrasonication for 30 minutes at room temperature, add 45g of ethylene-vinyl acetate copolymer EVA, stir for 30min under condensing reflux; add 100mL of absolute ethanol, filter ; The filtrate was dried at 90°C for 24 hours and then shredded to obtain a premix with 10% GNFs content;

[0041] 2) Mix 7.5g of the premix and 22.1g of EVA in a Haake rheometer at 120°C and 60r / m for 30min; after heating up to 140°C, add 16gCB, 4g of polyethylene wax, 0.4g of antioxidant 1010, After mixing at / m for 8 minutes, cut into pieces and granulate;

[0042] 3) Mix the mixture in the previous step with the crosslinking agent DCP at a ratio of 49:1, and mix it on the open mill at 100°C for 6 minutes; then crosslink it on a flat vulcanizer at 180°C, 20MPa, and press for 12 minutes, and hold the pressure Cool to normal temperature to obtain a composite material. The schematic diagram of the conductive network...

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Abstract

The invention belongs to the field of conductive shielding materials, and relates to a polymer conductive composite material with stable volume resistivity under temperature changes and a preparation method thereof. The composite material is composed of double-component conductive fillers and a polymer matrix. The mass percentage of a polymer accounts for 50-70%, the mass percentage of a control bus (CB) serving as a main conductive filler and used in the composite material accounts for 20-50%, a second component conductive filler is selected from one dimensional linear or two-dimensional sheet-shaped conductive filler, and the mass percentage of the additive amount of the second component conductive filler accounts for 1-10%. The preparation method of the polymer conductive composite material utilizes the polymer as the matrix, utilizes conducting particles as dispersed phases, is combined with a solution method to prepare high-concentration premix objects, and utilizes a melt blending process to combine the second component conductive filler and the low-cost CB to obtain the polymer matrix conductive composite material. The conductive composite material has the advantages of being stable in volume resistivity along with temperature changes, simple in preparation process and the like.

Description

Technical field [0001] The invention is the field of conductive shielding materials, which specifically involves a polymer conductive composite material and preparation method with a stable volume resistance rate under warming. Background technique [0002] Polymer -based conductive composite materials have the advantages of low cost and good processingability, and have been widely used in many areas instead of metal materials.With the rapid development of modern informatization, higher requirements have been put on information security and the stability operation of electrical appliances and telecommunications equipment. The polymer -based conductive composite material occupies an irreplaceable position in the fields of electromagnetic shielding and electric field shielding. [0003] At present, the preparation of polymer -based conductive composite materials mainly use melt mixing or solution mixing method to uniformly dispersed the conductive filler particles in the polymer ma...

Claims

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Application Information

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IPC IPC(8): C08L23/06C08L23/12C08L23/08H01B1/24C08K13/04C08K7/00C08K3/04C08K7/06C08K5/14B29B7/28B29B7/72B29C35/02
Inventor 党智敏方也查俊伟
Owner UNIV OF SCI & TECH BEIJING
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