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Epoxy resin-based composite material and preparation method thereof

An epoxy resin and composite material technology, applied in the field of polymer composite materials, can solve the problems of decreased castability and unfavorable processing and molding of composite materials.

Active Publication Date: 2021-07-06
TSINGHUA UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, if the amount added is too large, its ductility will decrease, which is not conducive to the processing and molding of composite materials.

Method used

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  • Epoxy resin-based composite material and preparation method thereof
  • Epoxy resin-based composite material and preparation method thereof
  • Epoxy resin-based composite material and preparation method thereof

Examples

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preparation example Construction

[0044] A preparation method of epoxy resin-based composite material, comprising the steps of:

[0045] Mixing the binder, the inorganic heat-conducting filler, the pore-forming material and the solvent to prepare a mixture A;

[0046] Carrying out freezing treatment and freeze-drying treatment to the mixture A in sequence, and then removing the pore-forming material to prepare a thermally conductive framework;

[0047] Mix epoxy resin, curing agent and accelerator to prepare mixture B;

[0048] Mixing the thermally conductive skeleton and the mixture B, and then performing vacuum defoaming treatment and curing treatment in sequence;

[0049] The pore-forming material is selected from ammonium bicarbonate, polyvinylpyrrolidone or sodium chloride.

[0050] First, use a binder to connect the inorganic heat-conducting filler and the pore-forming material. After freezing, the ice crystal is obtained. The ice crystal is freeze-dried to remove the solvent in the ice crystal, and th...

Embodiment 1

[0074] This embodiment provides an epoxy resin-based composite material and a preparation method thereof.

[0075] (1) Mix 1 g of BN, 2 g of ammonium bicarbonate, 10 g of cellulose and 10 mL of deionized water to obtain a uniformly mixed mixture A.

[0076] (2) Put the above mixture A in the refrigerator for 8 hours and freeze it into flakes, then transfer it to a freeze dryer (working parameters: vacuum degree <5Pa, temperature is -56°C), freeze-dry for 48 hours and take it out to obtain a solid intermediate .

[0077] (3) Heat the solid intermediate obtained in step (2) in a box furnace at 90°C for 24 hours to decompose ammonium bicarbonate to obtain a BN network heat conduction framework, which is self-supporting and does not collapse.

[0078] (4) Mix 100g of bisphenol F epoxy resin, 86g of methyltetrahydrophthalic anhydride and 2g of N,N-dimethylbenzylamine, and pre-evacuate at room temperature for 20 minutes after stirring to obtain uncured mixture B.

[0079] (5) Plac...

Embodiment 2

[0082] This embodiment provides an epoxy resin-based composite material and a preparation method thereof.

[0083] (1) Mix 1 g of BN, 1 g of ammonium bicarbonate, 10 g of cellulose and 10 mL of deionized water to obtain a uniformly mixed mixture A.

[0084] (2) Put the above mixture A in the refrigerator for 8 hours and freeze it into flakes, then transfer it to a freeze dryer (working parameters: vacuum degree <5Pa, temperature is -56°C), freeze-dry for 48 hours and take it out to obtain a solid intermediate .

[0085] (3) Heat the solid intermediate obtained in step (2) in a box furnace at 90°C for 24 hours to decompose ammonium bicarbonate to obtain a BN network heat conduction framework, which is self-supporting and does not collapse.

[0086] (4) Mix 100g of bisphenol F-type epoxy resin, 86g of methyltetrahydrophthalic anhydride and 2g of N,N-dimethylbenzylamine, and pre-evacuate at room temperature for 20 minutes after stirring to obtain uncured mixture B.

[0087] (5)...

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Abstract

The invention relates to an epoxy resin-based composite material and a preparation method thereof. The preparation method comprises the following steps: mixing a binder, an inorganic heat-conducting filler, a pore-forming material and a solvent to prepare a mixture A; performing freezing treatment and freeze-drying treatment on the mixture A in sequence, and then removing the pore-forming material to prepare a heat-conducting framework; mixing epoxy resin, a curing agent and an accelerant to prepare a mixture B; and mixing the heat-conducting framework with the mixture B, and sequentially performing vacuum defoaming treatment and curing treatment. The pore-forming material is selected from ammonium bicarbonate, polyvinylpyrrolidone or sodium chloride. The composite material has high thermal conductivity and high insulativity, and has a very good application prospect in high-frequency power electronic transformers.

Description

technical field [0001] The invention relates to the technical field of polymer composite materials, in particular to epoxy resin-based composite materials and a preparation method thereof. Background technique [0002] Epoxy resin, with hydroxyl and epoxy groups in its structure, has high chemical activity and is widely used. In view of its advantages of high mechanical properties, strong adhesion, high manufacturability and excellent electrical insulation properties, it is often used in the packaging of power electronic transformers. [0003] With the development of power electronics technology, power electronic transformers are developing in the direction of high voltage and high frequency, and the problem of heat dissipation is becoming more and more serious, which puts forward higher requirements for the thermal conductivity and heat resistance of insulating materials. However, pure epoxy resin itself has low thermal conductivity and poor thermal conductivity, and there...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L63/02C08L1/02C08K3/38
CPCC08L63/00C08L2203/20C08K2003/385C08L1/02C08K3/38
Inventor 杨颖姚彤陈可牛腾腾王菁
Owner TSINGHUA UNIV
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