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Preparation method of carbon nanotube modified reinforced bismaleimide resin matrix composite material

A modification technology of maleimide resin and carbon nanotubes, which is applied in the field of preparation of bismaleimide resin-based composite materials modified by carbon nanotubes, and can solve the problem of limited amount of grafting reaction and the number of amine groups Limited and other problems, to achieve excellent mechanical properties, improve dispersion and interface properties, and improve impact properties

Inactive Publication Date: 2020-02-18
TONGJI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the amines used in this patent are all small molecule organic amines, the number of amine groups is limited, and the amount of grafting reaction with carbon nanotubes is limited.

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  • Preparation method of carbon nanotube modified reinforced bismaleimide resin matrix composite material

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preparation example Construction

[0032] A carbon nanotube modified reinforced bismaleimide resin-based composite material preparation method, grafting hyperbranched polyethyleneimine to CNT, using it as a BMI modifier, utilizing the high strength and toughness of carbon nanotubes and The chain extension reaction of polyamines to BMI improves the strength and toughness of the material, thereby preparing a carbon nanotube modified reinforced bismaleimide resin-based composite material, including the following steps:

[0033]S1: Surface oxidation of CNTs, adding CNTs to the pre-prepared strong oxidizing acid solution for ultrasonic dispersion, stirring it evenly under the condition of magnetic force in a water bath Suction filtration on the filter membrane, and repeated washing with deionized water until the filtrate is neutral to obtain CNT-COOH, the above-mentioned strong oxidizing acid solution is the concentrated sulfuric acid of 1~55% by weight and the nitric acid of 1~35% by weight The solution prepared by...

Embodiment 1

[0041] This embodiment is a method for preparing a carbon nanotube modified reinforced bismaleimide resin-based composite material, which is carried out according to the following steps:

[0042] (1) Surface oxidation of CNTs: Add 1 g of CNTs to a pre-prepared 100 ml strong oxidant acid solution (concentrated sulfuric acid and concentrated nitric acid solution with a volume ratio of 3:1) and disperse them with 80 kHz ultrasonic waves for 20 min. After magnetically stirring and reacting in a water bath at 60°C for 2 hours, the reaction solution was suction-filtered on a 0.45 μm polytetrafluoroethylene microporous filter membrane, and washed with deionized water repeatedly until the filtrate was neutral to obtain CNT-COOH;

[0043] (2) Preparation of CNT-PEI: Disperse the treated carbon nanotubes in 100ml of water with an 80kHz ultrasonic wave to obtain a suspension of CNT-COOH, and add 1g EDC·HCl to the system to activate the carboxyl groups on the surface of the carbon nanotube...

Embodiment 2

[0052] This embodiment is a method for preparing a carbon nanotube modified reinforced bismaleimide resin-based composite material, which is carried out according to the following steps:

[0053] (1) Surface oxidation of CNT: Add 1 g of CNT to a pre-prepared 100 ml strong oxidant acid solution (concentrated sulfuric acid and concentrated nitric acid solution with a volume ratio of 4:1) and disperse with 80 kHz ultrasonic waves for 20 min. After magnetically stirring and reacting in a water bath at 60°C for 2 hours, the reaction solution was suction-filtered on a 0.45 μm polytetrafluoroethylene microporous filter membrane, and washed with deionized water repeatedly until the filtrate was neutral to obtain CNT-COOH;

[0054] (2) Preparation of CNT-PEI: Disperse the treated carbon nanotubes in 100ml of water with an 80kHz ultrasonic wave to obtain a suspension of CNT-COOH, and add 1g EDC·HCl to the system to activate the carboxyl groups on the surface of the carbon nanotubes Afte...

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Abstract

The invention relates to a preparation method of carbon nanotube modified reinforced bismaleimide resin matrix composite material, which comprises the following steps of: grafting hyperbranched polyethyleneimine (PEI) on the surface of carbon nanotube (CNT) through surface oxidation and amination treatment to obtain CNT-PEI, dispersing CNT-PEI in ethanol and adding comonomer dropwise to carry outprepolymerization reaction, and then vacuumizing and defoaming the prepolymer gel solution, and curing according to a certain curing process to obtain pouring splines. After oxidation treatment, hyperbranched PEI molecules are grafted on the surface of CNT to form a functional layer on its surface. PEI functional layer can effectively improve the dispersion and interfacial properties of carbon nanotubes. CNT-PEI shows good stability in ethanol solution, which is conducive to its dispersion in bismaleimide resin matrix, improves the mechanical and electrical properties of the composite material, and enables it to have potential application advantages in engineering plastics and special functional plastics.

Description

technical field [0001] The invention relates to a modified bismaleimide resin-based material, in particular to a method for preparing a carbon nanotube modified reinforced bismaleimide resin-based composite material. Background technique [0002] Carbon nanotubes (CNTs) are entangled with each other due to their large specific surface area, surface energy, and aspect ratio, which makes it impossible for carbon nanotubes to be fully utilized in practical applications, especially in the field of composite materials. Dispersed, exerting its own advantages in mechanics, magnetism, electricity and heat. Therefore, in practical applications, how to make full use of the performance advantages of carbon nanotubes is a topic that has been widely concerned. As an aerospace material with outstanding performance, bismaleimide (BMI) not only has many excellent properties such as high temperature resistance, radiation resistance, and heat and humidity resistance of polyimide, but also ha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G73/12C08K9/02C08K3/04C08K9/04
CPCC08G73/12C08K9/02C08K9/04C08K9/08C08K3/041
Inventor 邱军施煜楠
Owner TONGJI UNIV