Method for preparing three-phase bismaleimide resin matrix composite material, and applications of three-phase bismaleimide resin matrix composite material

A technology of maleimide resin and chemical grafting, which is applied in the field of preparation of three-phase bismaleimide resin-based composite materials, can solve problems such as unattainable mechanical properties, achieve excellent mechanical and mechanical properties, improve impact performance, the effect of alleviating stress concentration

Active Publication Date: 2020-02-11
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In this technical solution, the prepreg is only obtained by prepolymerization after adding DBA, and the obtained bismaleimide resin-based composite material is still a conventional performance material, and its mechanical properties still cannot meet the needs of current engineering materials.

Method used

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  • Method for preparing three-phase bismaleimide resin matrix composite material, and applications of three-phase bismaleimide resin matrix composite material

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Experimental program
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Embodiment 1

[0034] This embodiment is a method for preparing a three-phase bismaleimide resin-based composite material by chemical grafting of carbon fiber-carbon nanotube micro-nano synergistically reinforced phase, which is carried out according to the following steps:

[0035] (1) Surface oxidation of CNT: Prepare 100ml of a mixed solution of concentrated sulfuric acid and concentrated nitric acid with a volume ratio of 3:1 as a strong oxidant, weigh 1g of CNT and add it to the pre-prepared mixed acid solution and disperse it with an ultrasonic wave with a frequency of 80KHz for 20min . Stir it magnetically in a water bath at 60°C for 2 hours until uniform, then filter the reaction solution on a polytetrafluoroethylene microporous filter membrane with a pore size of 0.45 μm, and repeatedly wash with deionized water until the filtrate is neutral to obtain CNT -COOH;

[0036] (2) Preparation of CNT-PEI: disperse the treated carbon nanotubes into 100ml of water with an ultrasonic frequen...

Embodiment 2

[0046] This embodiment is a method for preparing a three-phase bismaleimide resin-based composite material by chemical grafting of carbon fiber-carbon nanotube micro-nano synergistically reinforced phase, which is carried out according to the following steps:

[0047] (1) Surface oxidation of CNT: Prepare 100ml of a mixed solution of concentrated sulfuric acid and concentrated nitric acid with a volume ratio of 3:1 as a strong oxidant, weigh 1g of CNT and add it to the pre-prepared mixed acid solution and disperse it with an ultrasonic wave with a frequency of 80KHz for 20min . Stir it magnetically in a water bath at 60°C for 2 hours until uniform, then filter the reaction solution on a polytetrafluoroethylene microporous filter membrane with a pore size of 0.45 μm, and repeatedly wash with deionized water until the filtrate is neutral to obtain CNT -COOH;

[0048] (2) Preparation of CNT-PEI: disperse the treated carbon nanotubes into 100ml of water with an ultrasonic frequen...

Embodiment 3

[0058] This embodiment is a method for preparing a three-phase bismaleimide resin-based composite material by chemical grafting of carbon fiber-carbon nanotube micro-nano synergistically reinforced phase, which is carried out according to the following steps:

[0059] (1) Surface oxidation of CNT: Prepare 100ml of a mixed solution of concentrated sulfuric acid and concentrated nitric acid with a volume ratio of 3:1 as a strong oxidant, weigh 1g of CNT and add it to the pre-prepared mixed acid solution and disperse it with an ultrasonic wave with a frequency of 80KHz for 20min . Stir it magnetically in a water bath at 60°C for 2 hours until uniform, then filter the reaction solution on a polytetrafluoroethylene microporous filter membrane with a pore size of 0.45 μm, and repeatedly wash with deionized water until the filtrate is neutral to obtain CNT -COOH;

[0060] (2) Preparation of CNT-PEI: disperse the treated carbon nanotubes into 100ml of water with an ultrasonic frequen...

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Abstract

The invention relates to a method for preparing a bismaleimide resin matrix three-phase composite material by adopting a carbon fiber-carbon nano-tube micro-nano synergistically-reinforced phase chemical grafting method. The method comprises: carrying out surface oxidation treatment on carbon nano-tubes (CNT) to obtain carboxylated carbon nano-tubes (CNT-COOH); carrying out chemical grafting to obtain micro-nano reinforced phase carbon fiber-carbon nano-tubes (CF-g-CNT) with the surface grafted with CNT-PEI; and enhancing a bismaleimide matrix phase by using the CNT-PEI, and carrying out curing demolding on the material through a mold pressing process to obtain the high-strength and high-modulus bismaleimide resin matrix composite material. Compared with the method in the prior art, the method of the invention has the following characteristics that the carbon nano-tube modified matrix phase and the reinforcement phase are designed so as to improve the final mechanical property of the material to the maximum extent, the carbon nano-tube modifier with a large number of active groups grafted on the surface is designed according to the modification technology of the carbon nano-tubes,and the carbon nano-tubes are introduced into the surfaces of the carbon fibers, so that the synergistic effect of the carbon fibers and the carbon nano-tubes is realized.

Description

technical field [0001] The invention relates to a method for preparing a three-phase bismaleimide resin-based composite material, in particular to a method for preparing a three-phase bismaleimide resin-based composite material by a chemical grafting method and its application. Background technique [0002] The interface bonding strength between carbon fiber and matrix is ​​one of the important indicators for evaluating the mechanical properties of carbon fiber composite materials. Only when a good interface bonding is achieved between the two, can carbon fiber effectively transmit external stress, thereby improving the strength of the composite material. mechanical properties. [0003] Due to the lack of active functional groups on the surface of carbon fibers and low surface energy, the surface wettability of carbon fibers is poor, and the interface bonding strength with the matrix resin is weak, which seriously affects the mechanical properties of carbon fibers. The exce...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L79/08C08K9/02C08K9/04C08K3/04C08K7/06
CPCC08K9/02C08K9/04C08K3/041C08K7/06C08L79/085
Inventor 邱军施煜楠
Owner TONGJI UNIV
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