Carbon nanofiber paper and preparation method thereof

Abstract

The invention discloses carbon nanofiber paper and a preparation method for the carbon nanofiber paper. According to the invention, the carbon nanofiber paper is prepared by adopting nanoscale carbon fiber, and the carbon nanofiber is combined with van der waals force therebetween relying on hydrogen bonds. The preparation method for the carbon nanofiber paper comprises the procedures of surface finish of carbon fiber, dispersing, flocculating, filtering and squeezing and drying. The carbon nanofiber paper, disclosed by the invention, has the advantages of large specific surface area, electrical conductivity, air permeability and hydrophilia; and the preparation method for the carbon nanofiber paper is applied to low-cost and large-scale industrial production.

Description

technical field [0001] The invention relates to the field of nanoscale carbon fibers, in particular to a carbon nanofiber paper and a preparation method thereof. Background technique [0002] Carbon nanofibers in a broad sense are nanoscale carbon fibers relative to ordinary micron-scale carbon fibers. According to the structure, they can be divided into carbon nanotubes (hollow carbon nanofibers) and solid carbon nanofibers. Carbon nanotubes are divided into single-walled carbon nanotubes. and multi-walled carbon nanotubes, while solid carbon nanofibers are fibrous nanocarbon materials rolled from multi-layer graphite sheets. quasi-one-dimensional materials. At present, there are three main ways to prepare carbon nanofibers: 1. Graphite arc method. In 1991, Japanese scientist Iijima first observed carbon nanotubes prepared by graphite arc method; 2. Laser evaporation method. This method is mainly used to synthesize single carbon nanofibers. Wall carbon nanotubes, this met...

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Problems solved by technology

However, micron-scale carbon fiber paper cannot replace carbon nanofiber paper. Carbon nanofibers are incomparable to ordinary micron-scale carbon fibers in terms of specific surface area, electrical conductivity and mechanical properties.

However, there is still a blank in China in terms of large-scale and low-cost production of carbon nanofiber paper, and many technologies are not suitable for large-scale and low-cost production

For example, Chinese patents CN102351165, CN102561109 and CN1475437 all disclose a method for preparing carbon nanotube paper obtained by dispersing suction filtration. This preparation method selects expensive carbon nanotubes, and due to the nanoscale size of carbon nanotubes , to ensure the retention of carbon nanotubes on the filter screen, the requirements for the filter screen are too high, and it is not suitable for large-scale low-cost production

Chinese patent CN101284662 discloses a method for preparing carbon nanotube film through flocculation treatment and separation and shaping process. Due to the addition of flocculation treatment process, this method does not require high filter screens, but still only uses expensive carbon nanotubes , and add a separation and shaping process, so it is not suitable for large-scale low-cost production

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