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Graphene oxide liquid crystal-epoxy resin composite material as well as preparation method and application thereof

An epoxy resin and composite material technology, applied in the field of electrical insulating materials, can solve the problems of insufficient strength and toughness, low dielectric properties, etc., and achieve improved mechanical properties and dielectric constant, increased dielectric constant, and increased percolation threshold. Effect

Pending Publication Date: 2021-02-09
JIANGSU UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing epoxy resin composite materials have problems such as low dielectric properties, insufficient strength and toughness, etc.

Method used

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  • Graphene oxide liquid crystal-epoxy resin composite material as well as preparation method and application thereof
  • Graphene oxide liquid crystal-epoxy resin composite material as well as preparation method and application thereof
  • Graphene oxide liquid crystal-epoxy resin composite material as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The first step: preparation of graphene oxide liquid crystal organic solution

[0032] In a 250mL flask, dissolve 400mg of graphene oxide in 80mL of deionized water, and disperse for 30 minutes with an ultrasonic cell pulverizer to obtain a uniform graphene oxide aqueous solution; add 80mL of ethyl acetate to the graphene oxide aqueous solution, and dropwise add 10mg The PAPMS-b-PDMS was magnetically stirred for 60 minutes, transferred to a separatory funnel, and statically layered, so that the graphene oxide was transferred from the aqueous phase to the organic phase to obtain a graphene oxide liquid crystal organic solution;

[0033] The second step: preparation of graphene oxide liquid crystal-epoxy resin composite

[0034] Add the above-mentioned graphene oxide liquid crystal organic solution and 10g bisphenol A type epoxy resin into a 250mL three-necked flask, mechanically stir at 40°C for 1h under a nitrogen atmosphere, and then continue mechanically stirring at 4...

Embodiment 2

[0036] The first step: preparation of graphene liquid crystal organic solution

[0037] In a 250mL flask, dissolve 200mg of graphene oxide in 50mL of deionized water, and use an ultrasonic cell pulverizer to disperse for 50 minutes to obtain a uniform graphene oxide aqueous solution; add 100mL of cyclohexane to the graphene oxide aqueous solution, and add 1mg The PAPMS-b-PDMS was magnetically stirred for 60 minutes, transferred to a separatory funnel, and statically layered, so that the graphene oxide was transferred from the aqueous phase to the organic phase to obtain a graphene oxide liquid crystal organic solution;

[0038] The second step: preparation of graphene oxide liquid crystal-epoxy resin composite

[0039] Add the above-mentioned graphene oxide liquid crystal organic solution and 10g of glycidyl ether type epoxy resin into a 250mL three-necked flask, mechanically stir at 45°C for 1h under a nitrogen atmosphere, and then continue mechanically stirring at 45°C for 10h...

Embodiment 3

[0041] The first step: preparation of graphene liquid crystal organic solution

[0042] In a 1L flask, dissolve 500mg of graphene oxide in 100mL of deionized water, and use an ultrasonic cell pulverizer to disperse for 50 minutes to obtain a uniform graphene oxide aqueous solution; add 200mL of ether to the graphene oxide aqueous solution, and dropwise add 10mg of PAPMS -b-PDMS was magnetically stirred for 60 minutes, transferred to a separatory funnel, and subjected to static layering, so that the graphene oxide was transferred from the aqueous phase to the organic phase to obtain a graphene oxide liquid crystal organic solution;

[0043] The second step: preparation of graphene oxide liquid crystal-epoxy resin composite

[0044] Add the above-mentioned graphene oxide liquid crystal organic solution and 10g of glycidyl ester type epoxy resin into a 250mL three-necked flask, mechanically stir at 45°C for 1h under a nitrogen atmosphere, and then continue mechanically stirring a...

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Abstract

The invention discloses a graphene oxide liquid crystal-epoxy resin composite material and a preparation method thereof. The preparation method comprises the following steps of: dissolving graphene oxide in deionized water; dispersing the obtained mixture into a graphene oxide liquid crystal aqueous solution by an ultrasonic cell disruptor; adding an organic solvent and PAPMS-b-PDMS; performing magnetic stirring; performing extraction to obtain a graphene oxide liquid crystal organic solution; adding the graphene liquid crystal epoxy resin into epoxy resin; mechanically stirring an obtained mixture in nitrogen and air in sequence; adding an amine curing agent or an an hydride curing agent and an accelerant; and performing stirring, pouring, bubble removing, thermal curing and natural cooling to obtain the graphene oxide liquid crystal-epoxy resin composite material. The liquid crystal phase graphene is uniformly and stably dispersed in the epoxy resin matrix, so that the tensile breaking strength and dielectric constant of the composite material are greatly improved compared with those of epoxy resin.

Description

technical field [0001] The invention relates to the field of electrical insulating materials, in particular to a graphene oxide liquid crystal-epoxy resin composite material and its preparation method and application. Background technique [0002] In recent years, dielectric nanocomposites have increasingly become a hot spot in the research of electrical materials. At present, graphene is used as a filler in dielectric composite materials, mainly based on the percolation threshold theory, that is, when the content of conductive filler in the matrix reaches a certain value, the conductivity of the composite material will increase significantly. is defined as the percolation threshold. When the amount of conductive filler is slightly less than the percolation threshold, the composite material will have high dielectric properties. Therefore, the amount of filler added to the dielectric composite material is mostly determined according to the percolation threshold. Before the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L63/00C08L83/10C08K3/04
CPCC08L63/00C08L83/10C08K3/042
Inventor 张壮壮张娇霞高一枫王磊汤继俊张竞李世云周海骏
Owner JIANGSU UNIV OF SCI & TECH