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

Abstract

The invention discloses a preparation method of a high-ortho phenyl borate modified thermosetting hollowed-out nano gradient activated carbon fibrous membrane. Phenyl borate is obtained by the hybridreaction of phenolic compounds, ethanol, oxalic acid and boric acid, and high-ortho phenyl borate modified thermoplastic phenol formaldehyde resin is generated by the reaction of the phenolic compounds, aldehyde compounds and the phenyl borate under the action of catalysts; the high-ortho phenyl borate modified thermoplastic phenol formaldehyde resin is dissolved in the alcohol compounds and the aldehyde compounds to be reacted under the action of the catalyst to obtain high-ortho phenyl borate modified thermosetting phenol formaldehyde resin; the high-ortho phenyl borate modified thermosetting phenol formaldehyde resin is taken as a carbon precursor solution, coaxial static spinning is adopted, and a high-ortho phenyl borate modified thermosetting phenol aldehyde fibrous membrane of whichsheath-core structural parts are mutually dissolvable is obtained by heating curing; the high-ortho phenyl borate modified thermosetting hollowed-out nano gradient activated carbon fibrous membrane is obtained by conducting carbonizing and activating with the presence of N2. The method has the advantages of being simple and easy to implement, friendly to the environment, controllable in hollowed-out degree, high in carbon fiber yield and high in mechanical performance.

Description

technical field [0001] The invention belongs to the field of preparation of special carbon materials, and in particular relates to a method for preparing a high-ortho-phenyl borate-modified thermosetting phenolic-based hollow nanometer gradient activated carbon fiber membrane. Background technique [0002] Phenolic resins are widely used in industry because of the easy availability of raw materials, convenient synthesis, and performance after curing that can meet various requirements for use. However, its heat resistance is relatively poor. In addition, thermoplastic phenolic formaldehyde has long curing cycle, many processes, high cost and environmental pollution. Thermosetting phenolic formaldehyde has low molecular weight and poor spinnability. In order to make phenolic fiber have high temperature resistance and high strength properties, the method of introducing inorganic elements into the resin structure is used to modify phenolic fiber at home and abroad, and good resu...

AI Technical Summary

Problems solved by technology

However, its heat resistance is relatively poor. In addition, thermoplastic phenolic has long curing cycle, many processes, high cost and pollutes the environment. Thermosetting phenolic has low molecular weight and poor spinnability.

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 and electrochemical performance of the activated carbon material.