A preparation method of high ortho boron modified thermosetting phenolic-based hollow nano-gradient activated carbon fiber membrane

Abstract

The invention discloses a preparation method of a highly-ortho boron-modified thermosetting phenolic-based hollow nano-gradient activated carbon fiber membrane. The preparation method of the highly-ortho boron-modified thermosetting phenolic-based hollow nano-gradient activated carbon fiber membrane comprises performing reversed decompressed dehydration on phenol and aldehyde compounds and boric acid with catalysts to obtain highly-ortho boron-modified phenolic resin; then dissolving the highly-ortho boron-modified phenolic resin into alcohol and aldehyde compounds with catalysts for reactionto obtain highly-ortho boron-modified thermosetting phenolic resin; taking the highly-ortho boron-modified thermosetting phenolic resin as a carbon precursor solution for coaxial electrostatic spinning, and then performing heating curing to obtain a highly-ortho boron-modified highly-ortho thermosetting phenolic fiber membrane with the skin-core structure partly inter-soluble; under protection ofN2, performing carbonization and activation to obtain the highly-ortho boron-modified thermosetting phenolic-based hollow nano-gradient activated carbon fiber membrane. Compared with the prior art, the preparation method of the highly-ortho boron-modified thermosetting phenolic-based hollow nano-gradient activated carbon fiber membrane is simple and easy to implement, environmentally friendly, controllable in hollowness and high in yield of carbon fiber as well as mechanical performance.

Description

technical field [0001] The invention belongs to the field of preparation of special carbon materials, and in particular relates to a preparation method of high-ortho-boron-modified thermosetting phenolic-based hollow nanometer gradient activated carbon fiber membrane. Background technique [0002] Phenolic resin has many advantages as a carbon precursor, but its heat resistance is relatively poor. In addition, thermoplastic phenolic resin has long curing cycle, many processes, high cost and pollutes the environment. Thermosetting phenolic resin has low molecular weight and poor spinnability. Problems have been unavoidable. In order to improve the heat resistance of phenolic fiber, chemical methods are usually used to modify the resin. The molecular structure of boron-modified phenolic resin contains B-O bonds with relatively high bond energy, which greatly improves the heat resistance and the initial decomposition temperature of the resin. Improvement, the thermal residual r...

AI Technical Summary

Problems solved by technology

[0002] Phenolic resin has many advantages as a carbon precursor, but its heat resistance is relatively poor. In addition, thermoplastic phenolic resin has long curing cycle, many processes, high cost and pollutes the environment. Thermosetting phenolic resin has low molecular weight and poor spinnability.

[0003] At present, the methods for preparing phenolic-based hollow activated carbon fibers include semi-solidification-dissolution method and special-shaped spinneret spinning method, but the prepared fibers are relatively thick, the preparation is cumbersome, the cost is high, the environment is heavy, and it is difficult to apply coaxial electrospinning in large areas. The silk method can solve the above problems very well.

Although the coaxial electrospinning method has been widely used in the preparation and production of various polymer-based micro-nano hollow fibers, it has not been applied to the spinning of high-ortho thermosetting phenolic resins.

At the same time, regardless of the traditional spinning method or electrospinning, the pore size distribution of the obtained hollow activated carbon fiber is uniform, and the size of the pores on the inner and outer walls of the fiber remains unchanged, which affects the adsorption performance of the activated carbon material.