A preparation method of nylon 6-graphene composite with excellent electrical conductivity and thermodynamic properties

A technology of thermodynamic performance and electrical conductivity, applied in the field of nanocomposite materials, to achieve the effect of improving thermodynamic performance

Active Publication Date: 2020-08-28
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the past, there were few reports on the direct compounding of nylon 6 powder and graphene to prepare conductive composites.

Method used

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  • A preparation method of nylon 6-graphene composite with excellent electrical conductivity and thermodynamic properties
  • A preparation method of nylon 6-graphene composite with excellent electrical conductivity and thermodynamic properties

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] 1) Mix 2 g of expanded graphite, 350 mL of concentrated sulfuric acid, and 2 g of potassium permanganate into a 500 mL three-necked flask, and react at 35°C for 1 hour to obtain low-oxidation expanded graphite (EGIC).

[0024] 2) Add the above-mentioned EGIC to 300 mL of deionized water, and add 2 g of surfactant OP-15, and perform ultrasound for 1 hour to obtain a low-oxidized graphene aqueous solution. Then take 20 mL of the above graphene aqueous solution by centrifugation to remove the upper layer liquid, and redisperse the lower layer of graphene into 50 mL of ethanol by shearing.

[0025] 3) Add 30 g of nylon 6 powder to the ethanol solution of the above graphene, stir for 2 hours, then filter through a mesh to obtain a wet nylon 6-graphene composite, and dry it overnight in a vacuum. Finally, the composite was molded at 200°C and 10 MPa. The final graphene content in the composite is 0.4 wt%.

[0026] From figure 1 It can be concluded that in this embodiment, the cond...

Embodiment 2

[0028] 1) Mix 2 g of expanded graphite, 350 mL of concentrated sulfuric acid, and 2 g of potassium permanganate into a 500 mL three-necked flask, and react at 35°C for 1 hour to obtain low-oxidation expanded graphite (EGIC).

[0029] 2) Add the above-mentioned EGIC to 300 mL of deionized water, and add 2 g of surfactant OP-15, and perform ultrasound for 1 hour to obtain a low-oxidized graphene aqueous solution. Then take 37 mL of the above graphene aqueous solution by centrifugation to remove the upper layer liquid, and redisperse the lower layer of graphene into 70 mL of ethanol by shearing.

[0030] 3) Add 25 g of nylon 6 powder to the ethanol solution of the above graphene, stir for 2 hours, then filter through a screen to obtain a wet nylon 6-graphene composite, and dry it overnight in a vacuum. Finally, the composite was molded at 200°C and 10 MPa. The final graphene content in the composite is 1.2 wt%.

[0031] From figure 1 It can be concluded that in this example, the condu...

Embodiment 3

[0033] 1) Mix 2 g of expanded graphite, 380 mL of concentrated sulfuric acid, and 2 g of potassium permanganate into a 500 mL three-necked flask, and react at 35°C for 1 hour to obtain expanded graphite (EGIC) with a low degree of oxidation.

[0034] 2) Add the above-mentioned EGIC to 300 mL of deionized water, and add 2 g of surfactant OP-15, and perform ultrasound for 1 hour to obtain a low-oxidized graphene aqueous solution. Then take 75 mL of the above graphene aqueous solution by centrifugation to remove the upper layer, and redisperse the lower layer of graphene into 80 mL of ethanol by shearing.

[0035] 3) Add 15 g of nylon 6 powder to the above-mentioned graphene ethanol solution, stir for 2 hours, and then filter through a screen to obtain a wet nylon 6-graphene composite, and dry it overnight in a vacuum. Finally, the composite was obtained by compression molding at 210°C and 10 MPa. The final graphene content in the composite is 3 wt%.

[0036] From figure 1 It can be c...

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Abstract

The invention relates to a preparation method of a nylon 6-graphene compound having excellent electroconductivity and thermodynamic properties. The preparation method comprises oxidizing expanded graphite to obtain mildly oxidized expanded graphite EGIC, carrying out ultrasonic treatment on the EGIC in the presence of a surfactant to obtain a low oxidation degree graphene aqueous solution, removing the supernatant through centrifugation, re-dispersing the graphene in the lower layer in ethanol through a shearing method, adding nylon 6 powder into the ethanol solution of graphene, carrying out mechanical stirring for 2h, filtering the mixture through a filter screen, drying the mixture at a temperature of 80 DEG C over night, and carrying out molding through a mold to obtain the nylon 6-graphene compound. The nylon 6-graphene compound has a very low percolation threshold (0.08 vol%) and has conductivity of 13.5 s / m when graphene content is only 2.45 vol%. Compared with nylon 6, the nylon 6-graphene compound improves elastic energy storage modulus by 70% at a temperature of 0 DEG C compared with pure nylon 6 and improves a glass transition temperature by 5 DEG C. The preparation method is easy to operate, is environmentally friendly and has a good industrial application prospect.

Description

Technical field [0001] The invention relates to a simple preparation method of graphene / polymer composites, in particular to a preparation method of nylon 6-graphene composites with excellent electrical conductivity and thermodynamic properties, belonging to the field of nano composite materials. Background technique [0002] Since graphene was first discovered in 2004, it has been widely used in electronic devices, polymer composites and other fields with its outstanding thermodynamic, electrical, optical and other properties. Especially in the field of polymer composite research, graphene has become one of the most popular reinforcement materials. [0003] Recently, there have been endless researches on the conductivity of graphene polymer composites. Because improving the conductivity of polymers can make polymers have a wide range of applications (electronic devices, electromagnetic shielding materials, thermal conductive materials, etc.). The most important problem is to bui...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L77/02C08K9/04C08K9/02C08K7/24
CPCC08K7/24C08K9/02C08K9/04C08K9/08C08K2201/001C08L77/02
Inventor 卢红斌王鹏
Owner FUDAN UNIV
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