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Preparation method of root-like carbon nanotube grafting carbon fiber reinforcement

A carbon nanotube and carbon fiber technology, which is applied in the field of carbon fiber reinforcement preparation, can solve the problems of long process time, toxic process, poor interface bonding performance, etc., and achieves improved shear strength, interface shear strength improvement, cost low effect

Inactive Publication Date: 2012-03-28
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The technical problem to be solved by the present invention is to solve the problem that the existing method takes a long time to process, the process is poisonous, the obtained imitation tree root type reinforcing material and the resin matrix are only mechanically meshed, and the interface bonding performance is poor. Preparation method of root-like carbon nanotube grafted carbon fiber reinforcement

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  • Preparation method of root-like carbon nanotube grafting carbon fiber reinforcement
  • Preparation method of root-like carbon nanotube grafting carbon fiber reinforcement
  • Preparation method of root-like carbon nanotube grafting carbon fiber reinforcement

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specific Embodiment approach 1

[0008] Specific Embodiment 1: In this embodiment, the preparation method of tree-like carbon nanotube grafted carbon fiber reinforcement is as follows: 1. Acid treatment of carbon nanotubes: adding 0.01 to 5 parts by weight of carbon nanotubes to 1 to 100 parts by weight In strong acid, then ultrasonically treat for 6h-9h at a temperature of 60°C-100°C and a frequency of 40KHz-90KHz, then filter with a microporous membrane, and wash the filtered carbon nanotubes with deionized water until the washing liquid is Neutral, dry at a temperature of 30°C to 100°C to obtain carboxyl-modified carbon nanotubes; 2. Mix carboxyl-modified carbon nanotubes and dendrimer-modified carbon fibers at a ratio of 5 to 20:100 The weight ratio is put into the solvent, and then reacted at 20°C-50°C for 12h-24h, filtered, and the filtered carbon fiber is washed alternately with acetone and deionized water for 3-5 times, and then the carbon fiber is placed at 30 Drying under the condition of ℃~100℃ can...

specific Embodiment approach 2

[0012] Specific embodiment two: what this embodiment is different from specific embodiment one is that the strong acid described in step one is that mass concentration is 70% nitric acid, mass concentration is 98% sulfuric acid or mass concentration is 70% nitric acid and mass concentration is 98% % sulfuric acid according to the mixed acid of 1:3 volume ratio composition. Others are the same as in the first embodiment.

[0013] The interfacial shear strength of the carbon fiber / epoxy resin composite material obtained in this embodiment is 150.46MPa, and the impact toughness of the epoxy resin matrix is ​​5.73J (the carbon fiber / epoxy resin composite material prepared by carbon fiber without carbon nanotube grafting The interface shear strength is 45.3MPa~50.5MPa, the impact toughness of the epoxy resin matrix is ​​3.02J~3.34J), the interface shear strength has increased by 170%~250%, and the impact toughness of the epoxy resin has increased by 60%~ 85%.

specific Embodiment approach 3

[0014] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that the carbon nanotubes described in step 1 are single-walled carbon nanotubes or multi-walled carbon nanotubes. Others are the same as in the first or second embodiment.

[0015] The interfacial shear strength of the carbon fiber / epoxy resin composite material obtained in this embodiment is 150.46MPa, and the impact toughness of the epoxy resin matrix is ​​5.73J (the carbon fiber / epoxy resin composite material prepared by carbon fiber without carbon nanotube grafting The interface shear strength is 45.3MPa~50.5MPa, the impact toughness of the epoxy resin matrix is ​​3.02J~3.34J), the interface shear strength has increased by 170%~250%, and the impact toughness of the epoxy resin has increased by 60%~ 85%.

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Abstract

The invention relates to a preparation method of a root-like carbon nanotube grafting carbon fiber reinforcement, relating to the preparation method of a carbon fiber reinforcement. The invention solves the problems that the traditional method has long process time and toxic procedures and prepares a root-like reinforced material which is mechanically engaged with a resin substrate and has poor interface adhesive performance. The method comprises the following steps: (1) processing a carbon nanotube with acid; and (2) putting carboxyl-modified carbon nanotube and dendritic macromolecule-modified carbon fiber into a solvent; then, reacting for 12-24h; filtering; and washing and drying the filtered carbon fiber to obtain the root-like carbon nanotube grafting carbon fiber reinforcement. Theobtained root-like carbon nanotube grafting carbon fiber reinforcement not only can form a mechanical engagement action with epoxide resin, but also enables a great amount of active functional groupson the surface to form chemical keys with open epoxy groups in the epoxide resin, improves the interface shearing strength of carbon fiber / epoxide resin composite material by 170-250% and improves the impact toughness of the epoxide resin by 60-85%.

Description

technical field [0001] The invention relates to a method for preparing a carbon fiber reinforced body. Background technique [0002] Combining micron-scale conventional carbon fibers with nanoscale carbon nanotubes, tree-root-like reinforcements have been shown to increase mechanical engagement at the interface and significantly improve interface performance. However, at present, carbon nanotubes are grown directly on the surface of carbon fibers by chemical vapor deposition. The process is mainly to use magnetron sputtering technology (Magnatron Sputtering) to sputter a layer of stainless steel on the fiber bundle as a catalyst, and then pass N at high temperature. 2 and H 2 The mixed gas converts the catalyst layer into catalyst particles, and then changes the acetylene gas to obtain a layer of carbon nanotubes on the surface of the carbon fiber, and then uses the carbon fiber as a composite material reinforcement to obtain a tree-like fiber-reinforced composite material...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D06M11/74D06M101/40
Inventor 赫晓东梅蕾李宜彬王荣国彭庆宇
Owner HARBIN INST OF TECH
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