Preparation method of bicontinuous-phase alumina/epoxy resin composite material

A technology of epoxy resin and phase alumina, applied in ceramic products, applications, household appliances, etc., can solve the problem of low thermal conductivity, and achieve the effects of simple preparation process, improved high and low temperature mechanical properties, and easy operation.

Inactive Publication Date: 2017-05-10
STATE GRID CORP OF CHINA +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The technical problem to be solved by the present invention is aimed at Al in the existing epoxy composite material 2 o 3 The problem of low thermal conductivity caused by the isolated distribution of particles provides a method for the preparation of bicontinuous alumina / epoxy composites

Method used

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  • Preparation method of bicontinuous-phase alumina/epoxy resin composite material

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Embodiment 1

[0030] A preparation method of dual continuous phase aluminum oxide / epoxy resin composite material, comprising the following steps:

[0031] 1) Mix 95wt% Al in a mortar 2 o 3 powder (0.5μm) and 5wt% PVA (solid phase content 8wt%) were uniformly mixed, and sieved through a 150-mesh sieve to obtain a powder for molding; after bidirectional compression molding under a pressure of 40MPa, an alumina green body was obtained. Put the pressed green body into a high-temperature air furnace, sinter at 1200°C under normal pressure, and keep it warm for 2 hours to obtain a porous alumina ceramic with a porosity of 55%. The temperature is 3°C / min below 600°C, and the sintering temperature is from 600°C to at 5°C / min, the obtained porous Al 2 o 3 After the ceramic surface is ground and leveled, it is placed in absolute ethanol containing 2wt% silane coupling agent for surface modification, and kept at 80°C for 2h;

[0032] 2) Stir the bisphenol A epoxy resin, curing agent and accelerato...

Embodiment 2

[0034] A preparation method of dual continuous phase aluminum oxide / epoxy resin composite material, comprising the following steps:

[0035] 1) Mix 95wt% Al in a mortar 2 o 3 powder (0.2μm) and 5wt% PVA (solid phase content 10wt%) were uniformly mixed, and sieved through a 200-mesh sieve to obtain the powder used for molding; after two-way compression molding under a pressure of 55MPa, an alumina green body was obtained. Put the pressed green body into a high-temperature air furnace, sinter at 1250°C under normal pressure, and keep it warm for 2 hours to obtain a porous alumina ceramic with a porosity of 50%. The temperature is 3°C / min below 600°C, and the sintering temperature is from 600°C to at 5°C / min, the obtained porous Al2 o 3 After the ceramic surface is ground and leveled, it is placed in absolute ethanol containing 5wt% silane coupling agent for surface modification, and kept at 60°C for 5h;

[0036] 2) Stir the bisphenol F epoxy resin, curing agent and accelerato...

Embodiment 3

[0038] A preparation method of dual continuous phase aluminum oxide / epoxy resin composite material, comprising the following steps:

[0039] 1) Mix 95wt% Al in a mortar 2 o 3 powder (0.5μm) and 5wt% PVA (solid phase content 15wt%) were uniformly mixed, and sieved through a 150-mesh sieve to obtain a powder for molding; after bidirectional compression molding under a pressure of 25MPa, an alumina green body was obtained. Put the pressed green body into a high-temperature air furnace, sinter at 1150°C under normal pressure, and hold for 2 hours to obtain a porous alumina ceramic with a porosity of 61%. The temperature is 3°C / min below 600°C, and the sintering temperature is from 600°C to at 5°C / min, the obtained porous Al 2 o 3 After the ceramic surface is ground and leveled, it is placed in absolute ethanol containing 3wt% silane coupling agent for surface modification, and kept at 70°C for 3h;

[0040] 2) Stir the bisphenol S type epoxy resin, curing agent and accelerator ...

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Abstract

The invention relates to a preparation method of a bicontinuous-phase alumina / epoxy resin composite material, belonging to the technical field of composite materials. The method comprises the following steps: carrying out compression molding on Al2O3 powder with different particle sizes under different pressures, and sintering at different temperatures under normal pressure for holding time to obtain the porous Al2O3 ceramic with adjustable porosity and pore size; and after carrying out surface modification, standing the preheated porous Al2O3 ceramic in a mixed solution composed of an epoxy resin, an accelerator and a curing agent for some time, and carrying out solidifying formation to obtain the bicontinuous-phase alumina / epoxy resin composite material. The porosity of the porous alumina ceramic is regulated by controlling the content of the foaming agent and the volume density of the green compact, thereby regulating the volume percent of the alumina reinforcement phase in the composite material. The alumina phase in the composite material is a continuous phase, can greatly enhance the high / low-temperature mechanical properties, thermal conductivity and high-temperature creep resistance of the alumina / epoxy composite material, and provides a new idea for researching and developing high-performance epoxy resin composite materials.

Description

[0001] Technical field: [0002] The invention relates to the field of polymer composite materials, in particular to a preparation method of a bicontinuous-phase alumina / epoxy resin composite material. [0003] Background technique: [0004] Doping SiO into epoxy resin matrix 2 、Al 2 o 3 , CaCO 3 , carbon fiber, carbon nanotube, graphene and other inorganic nano / micro particles can effectively improve the mechanical properties such as Young's modulus, tensile strength and fracture toughness of the material, and can also improve the heat resistance and thermal conductivity of the epoxy resin material , And electrical properties such as dielectric constant. [0005] As an epoxy resin composite material for gas insulated switchgear (GIS), because it is filled with a certain pressure of SF 6 Gas, the inorganic particles required to be added can effectively resist SF 6 Toxic gas from gas decomposition. al 2 o 3 Particle resistant to SF 6 Gas corrosion, also has the advanta...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L63/00C08K9/06C08K7/24C04B38/06C04B35/111
CPCC04B35/111C04B38/067C08K7/24C08K9/06C04B2235/96C04B2235/9607C04B2235/6562C04B2235/6567C04B38/0074C08L63/00
Inventor 张小平王波孙帆曾德军赵杉庾甜甜杨建锋
Owner STATE GRID CORP OF CHINA
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