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Process for preparing polymer and graphite conductive nano composites

A nano-conductive and composite material technology, which is applied in the field of preparation of polymer/graphite nano-conductive composite materials, can solve the problems of high viscosity, high percolation threshold, poor conductivity, etc., and achieve fast, percolation valve The effect of low value and low cost

Inactive Publication Date: 2008-11-05
NANJING UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The method of the melt intercalation method is very simple and the process cost is low, but its fatal disadvantage is that during the melt mixing process of the fluffy expanded graphite and the polymer, the expanded graphite collapses in large quantities, and the expanded nanoscale graphite wafers A large number of micron-scale wafers are bonded together, and the viscosity of the polymer melt is very large, and it is difficult to penetrate into the expanded graphite nano-scale graphite wafer sheets. Therefore, the polymer / polymer prepared by the melt intercalation method In the graphite conductive composite material, there are few graphite chips dispersed at the nanometer scale, which is essentially a conductive composite material with graphite dispersed at the micron scale, with a high percolation threshold and poor electrical conductivity

Method used

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  • Process for preparing polymer and graphite conductive nano composites

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Commercially available expandable graphite with an expansion volume of 250 mL / g was placed in a high-temperature furnace at 900° C. for expansion to obtain expanded graphite. According to the ratio of expanded graphite: dibutyl phthalate: absolute ethanol mass ratio of 1: 2: 30, dibutyl phthalate and absolute ethanol are first mixed uniformly to prepare a solution, and then the expanded graphite Suspended and dispersed in an anhydrous ethanol solution of dibutyl phthalate, and placed in an ultrasonic water bath at 60°C for ultrasonic treatment for 4 hours, and then placed in a drum dryer at 80°C, at a drum speed of 50r / min Under the circumstances, the absolute ethanol is removed to obtain the composite expanded graphite of composite dibutyl phthalate.

[0031] According to the ratio of composite expanded graphite: polyvinyl chloride: calcium / zinc composite stabilizer mass ratio of 36:62:2, composite expanded graphite, calcium / zinc composite stabilizer and polyvinyl chlo...

Embodiment 2

[0033] Commercially available expandable graphite with an expansion volume of 300 mL / g was placed in a high-temperature furnace at 700° C. for expansion to obtain expanded graphite. According to the ratio of expanded graphite: dibutyl phthalate: absolute ethanol mass ratio of 1:0.5:24, dibutyl phthalate and absolute ethanol are mixed uniformly to prepare a solution, and then the expanded graphite Suspend and disperse in an absolute ethanol solution of dibutyl phthalate, soak at 50°C for 4 hours, then distill off the absolute ethanol under reduced pressure at 50°C to obtain a composite expanded graphite compounded with dibutyl phthalate.

[0034] According to composite expanded graphite: polyvinyl chloride: calcium / zinc composite stabilizer: phthalate bis (2-ethylhexyl ester) mass ratio is the ratio of 10: 68: 2: 20, composite expanded graphite, calcium / zinc Composite stabilizer, polyvinyl chloride and bis(2-ethylhexyl phthalate) are pre-mixed uniformly in a kneader, and then m...

Embodiment 3

[0036] Commercially available expandable graphite with an expansion volume of 200 mL / g was placed in a high-temperature furnace at 900° C. for expansion to obtain expanded graphite. According to the ratio of expanded graphite: dibutyl phthalate: acetone mass ratio of 1:0.2:20, first mix dibutyl phthalate and acetone evenly to prepare a solution, and add 6% of expanded graphite mass Titanate coupling agent NDZ-201, and then suspend and disperse the expanded graphite in the acetone solution of dibutyl phthalate, soak it at 50°C for 4h, and then distill off the acetone under reduced pressure at 50°C to obtain the composite ortho Composite expanded graphite of dibutyl phthalate.

[0037] According to composite expanded graphite: polyvinyl chloride: calcium / zinc composite stabilizer: phthalate bis(2-ethylhexyl ester) mass ratio is the ratio of 13:65:2:20, composite expanded graphite, calcium / zinc Composite stabilizer, polyvinyl chloride and bis(2-ethylhexyl phthalate) are pre-mixe...

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Abstract

The present invention discloses a method for preparation of conducting composite material of polymer / graphite nanometer. The invention mixes the low molecular auxiliary agent such as plasticizer solution or emulsion with the expanded graphite, removes the solvent or disperse medium after the low molecular auxiliary agent solution or emulsion filters the expanded graphite, produces the composite expanded graphite of composite of the low molecular auxiliary agent and the expanded graphite, afterwards, mixes the composite expanded graphite with the polymer in the phase of fusion in order to prepare conducting composite material of polymer / graphite nanometer. The method of the invention is simple, without using special, expensive and poisonous solvent. The graphite of the conducting composite material disperses in the polymeric matrix in the form of layers of the nanometer graphite wafer, which is of low usage of graphite and excellent conductive property, and the obtained conducting composite material is of low coat and easy spread.

Description

1. Technical field [0001] The invention relates to a preparation method of a polymer-based conductive composite material, in particular to a preparation method of a polymer / graphite nano conductive composite material. 2. Background technology [0002] Dispersing graphite in a polymer matrix can prepare a polymer / graphite conductive composite material. If graphite is dispersed in the form of nanoscale graphite plates in the polymer matrix, the conductive percolation threshold of the polymer / graphite conductive composite is low, that is, it can be used in the polymer / graphite conductive composite under the condition of low graphite content. Form a three-dimensional conductive network, showing excellent conductive properties. [0003] A feasible way to disperse graphite in the form of nanoscale graphite flakes in a polymer matrix is ​​to use expanded graphite and polymers for compounding. The specific process is as follows: firstly, the natural flake graphite is treated chemi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/536C04B35/634
Inventor 应宗荣胡张俊杨坤彭永才董慧娟
Owner NANJING UNIV OF SCI & TECH
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