Preparation method of reinforced polymer base composite material for high volume fraction carbon nano-pipe
A technology of high volume fraction and carbon nanotubes, which is applied in the field of preparation of high volume fraction carbon nanotubes reinforced polymer matrix composites, can solve the problems of low volume fraction of CNTs, random orientation of CNTs, inability to carry effectively, and achieve CNT Uniform distribution, high CNT volume fraction, and broad application prospects
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[0012] A preparation method of a porous CNT preform: (the applicant has applied for another invention patent, the application date is November 7, 2005, and the application number is 200510061453.6)
[0013] a) mixing, stirring and grinding each gram of carbon nanotubes with 0.1-4ml of a pore-forming agent solution containing a binder, wherein the concentration of the binder is 0.01-20%, to achieve uniform mixing;
[0014] b) Put the uniformly mixed powder into the mold, apply a pressure of 1-100MPa, raise the temperature to 50-250°C at a rate of 0.5-5°C / min, keep the temperature and pressure for 0.5-12h, then cool naturally to room temperature and The pressure is released, that is, the porous carbon nanotube prefabricated body.
[0015] The carbon nanotubes are single-wall or multi-wall carbon nanotubes, modified or unmodified carbon nanotubes.
[0016] The binder is a natural or synthetic organic polymer that can be formulated into a solution to facilitate uniform mixing wit...
Embodiment 1
[0025] 1) Stacking five layers of single-walled CNT preforms to obtain a CNT preform. Then put the CNT preform into the mold of the die-casting process;
[0026] 2) The epoxy resin / anhydride system (such as TDE85 / MNA anhydride) prepared by die-casting at room temperature is injected into the mold;
[0027] 3) After injection, cure with the set program: 130°C / 2h+150°C / 1h+180°C / 2h+200°C / 3h. Cool naturally to room temperature after curing. The sample was taken out from the mold to obtain the CNT / epoxy composite material.
Embodiment 2
[0029] 1) Put 2g of single-walled carbon nanotubes (SWNT) into 200ml of mixed acid (concentrated nitric acid:concentrated sulfuric acid in a volume ratio of 3:1) and ultrasonically shake at 50°C for 8 hours. The system was diluted with deionized water, and then vacuum-filtered with a microporous filter membrane with a pore size of 0.22 μm. The sediment was washed with deionized water, and then suction filtered, and so on, until the pH value of the cleaning solution was 5-6, and the product was dried in a vacuum oven to obtain acidified SWCNTs.
[0030] 2) Acidified SWCNTs preforms are prepared by the preparation method of porous carbon nanotube preforms;
[0031] 3) Stacking five layers of acidified single-wall CNT preforms to obtain a CNT preform. Then put the CNT preform into the mold of the die-casting process;
[0032] 4) Die-cast the configured epoxy resin / anhydride system (such as TDE85 / MNA anhydride) at room temperature;
[0033] 5) After the die-casting is completed...
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