Super-smooth carbon nanotube epoxy resin composite material and preparation method and application thereof

A carbon nanotube and epoxy resin technology, applied in the field of nanomaterials, can solve the problems of easy agglomeration of carbon tubes, sharp increase in resin viscosity, large specific surface area of ​​carbon nanotubes, etc., and achieve the effect of easy contact and straight defects

Active Publication Date: 2020-10-27
THE NAT CENT FOR NANOSCI & TECH NCNST OF CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Carbon nanotubes have excellent electrical conductivity and a large aspect ratio, which is an ideal choice for improving the electrical conductivity of epoxy resins, but there are still some problems in current applications: (1 ) carbon nanotubes have large specific surface area and high surface energy. Carbon tubes are very easy to agglomerate due to van der Waals force and fibrous structure, and it is difficult to disperse completely in the resin; (2) in order to achieve better electrical conductivity, general short carbon tubes ( More than a dozen to tens of microns long) requires a higher amount of addition, which brings many problems such as a sharp increase in viscosity, incomplete curing, and increased defects in composite materials.

Method used

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  • Super-smooth carbon nanotube epoxy resin composite material and preparation method and application thereof
  • Super-smooth carbon nanotube epoxy resin composite material and preparation method and application thereof
  • Super-smooth carbon nanotube epoxy resin composite material and preparation method and application thereof

Examples

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Effect test

preparation example 1

[0069] In this preparation example, the CVD growth method is used to prepare super-parallel carbon nanotubes (referred to as: SACNTs), and the specific preparation method is as follows:

[0070] (1) The silicon substrate is etched, and the etching is carried out in a polytetrafluoroethylene cell, and the platinum cathode is irradiated with a halogen lamp for 5 minutes under backlighting. The corrosion solution contains one part of hydrogen fluoride (50% aqueous solution) and one part of ethanol, and the anodic oxidation current density is kept at 10mA / cm 2 . The resulting porous silicon has a thin nanoporous layer (pore size; 3 nm) on top of a macroporous layer (with submicron pores);

[0071] (2) Iron powder catalyst is deposited into a thin film on a silicon substrate;

[0072] (3) Place the silicon substrate in an argon (Ar, 1000 sccm) atmosphere, and continue for 15 minutes after the temperature reaches 680°C;

[0073] (4) Add hydrogen (H 2 ) and acetylene (C 2 h 2 )...

preparation example 2

[0075] This preparation example prepares a surface-modified super-parallel carbon nanotube (referred to as: f-SACNTs), the method is as follows:

[0076] (1) Configure Triton X-100 (Triton) acetone solution, add Triton X-100 to the acetone solution and stir magnetically at 25°C for 1 hour to make a concentration of 2×10 -3 mol / L Triton X-100 acetone solution.

[0077] (2) Place 0.5 g of the superparallel carbon nanotubes prepared in Preparation Example 1 in 300 mL of acetone solution containing Triton X-100, and stir magnetically at 25° C. for 24 h; then use a water bath to ultrasonically disperse for 12 h, and initially disperse Carbon tubes; followed by probe-type ultrasonic dispersion for 10 minutes, so that Triton X-100 is fully adsorbed to the surface of carbon tubes, and super-parallel carbon nanotubes with surface non-covalent chemical modification are obtained.

[0078] The super-parallel carbon nanotubes prepared by Preparation Example 1 are characterized by SEM, as ...

preparation example 3

[0081] This preparation example prepares a kind of super-parallel carbon nanotube / epoxy resin composite material (recorded as: SACNTs / EP), and the preparation method is as follows:

[0082](1) Blend the super-parallel carbon tube powder obtained in Preparation Example 1 with a high-speed mixer (AE03, DISPERMAT VAM-GETZMANN, Germany) and epoxy resin (type E51, preheated at 80°C for 30min), and The mixing temperature is 80°C, the stirring speed is 4000rpm, and the stirring time is 2h.

[0083] (2) The mixture obtained in (1) was further mixed and dispersed using a three-roll mill (EXAKT 80E, EXAKT Technologies, Germany). When dispersing, the spacing mode is adopted, and the roller spacing is set to 120:40, 105:35, 90:30, 60:20, 45:15, 30:10, 15:5, and each spacing process is repeated twice; the speed of the driving roller is set It was 90rpm, increased to 100rpm with the decrease of the roller spacing, and finally increased to 110rpm, and the dispersed SACNTs / EP masterbatch was...

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Abstract

The invention relates to a super-smooth carbon nanotube epoxy resin composite material and a preparation method and application thereof. The super-smooth carbon nanotube epoxy resin composite materialcomprises a master batch and a curing agent, wherein the master batch comprises epoxy resin and super-aligned carbon nanotubes dispersed in the epoxy resin. According to the invention, the super-smooth carbon nanotubes with higher length-diameter ratio and fewer defects are added into the epoxy resin for the first time to form the composite material, and the conductive material with high conductivity and extremely low threshold value can be obtained by only needing a very small addition amount. Furthermore, a non-covalent functionalized surface treatment technology is used for modifying the superparaxial carbon nanotubes so that the dispersion of the superparaxial carbon nanotubes in the epoxy resin and the binding capacity of the superparaxial carbon nanotubes with the epoxy resin are improved, and no defects are introduced to the surfaces of the carbon tubes, thereby improving the intrinsic conductivity of the carbon tubes. Meanwhile, through the combination of different mechanicaldispersion methods, the dispersion capability of the super-smooth carbon nanotubes in the epoxy resin is further improved.

Description

technical field [0001] The invention belongs to the technical field of nanomaterials, and relates to an epoxy resin composite material and its preparation method and application, in particular to a super-parallel carbon nanotube epoxy resin composite material and its preparation method and application, especially to a high-efficiency Super-parallel carbon nanotube epoxy resin composite material with electrical conductivity and extremely low threshold value, its preparation method and application. Background technique [0002] Epoxy materials have excellent comprehensive properties and are widely used in various fields. But epoxy resin is an insulating material with a volume resistivity as high as 10 16 Ω·cm cannot be applied in some fields that require materials to be conductive, such as electromagnetic shielding materials, antistatic materials, and lightning strike protection materials. If the epoxy resin can be endowed with certain conductivity, its application field wil...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L63/02C08K9/04C08K3/04
CPCC08K9/04C08K3/041C08K2201/016C08K2201/001C08K2201/011C08K2201/003C08K2201/004C08L63/00
Inventor 王胜强高锋张晖
Owner THE NAT CENT FOR NANOSCI & TECH NCNST OF CHINA
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