A kind of impregnation method of porous carbon material

Abstract

The invention discloses an impregnation method of a porous carbon material. The impregnation method comprises following steps: adding thermosetting liquid phenolic resin into anhydrous ethanol, evenlydissolving, then slowly adding polyethylene glycol, stirring until polyethylene glycol is completely dissolved to obtain an impregnating agent; adding a carbon material into an impregnation device, vacuumizing the impregnation device, maintaining a vacuum degree of -0.07 to -0.09 MPa for 15 to 40 minutes so as to completely remove air in the pores of the carbon material; then sucking the preparedimpregnating agent into the impregnation device, after the impregnating agent completely submerges the carbon material, increasing the pressure, carrying out impregnation for 20 to 60 minutes under apressure of 0.3 to 1.0 MPa to obtain an impregnated blank of the carbon material; placing the impregnated blank in an environment with a room temperature for a while, and then burning the impregnatedblank in a burning furnace in the absence of air to obtain the porous carbon material, wherein the burning can be divided into five phases. The obtain porous carbon material has the advantages of high strength, narrow pore size distribution, and high filter precision, and can be used in a high temperature and corrosive environment.

Description

technical field [0001] The invention belongs to the technical field of chemical materials, in particular to a method for impregnating porous carbon materials. Background technique [0002] High-risk materials, heavy metals, precious metals, coal gasification, and environmental protection all need a purification material that can withstand high temperature and corrosion, has good air permeability, high filtration accuracy, and is easy to clean. At present, the porous filter materials used to purify liquids and gases are mostly ceramic materials, metal and alloy materials, polymer materials, fiber materials, porous carbon or foam carbon materials, etc. However, because metal and ceramic materials are resistant to high temperature but not corrosion resistant, while polymer materials and fiber materials are not resistant to high temperature, their application as porous filter materials is limited, while porous carbon materials have heat resistance, corrosion resistance, radiatio...

AI Technical Summary

Problems solved by technology

[0004] Chinese patent CN102417174A discloses a porous carbon material and its preparation method. The patent uses raw petroleum coke, raw pitch coke, and metallurgical coke as skeleton carbon raw materials, pitch and coal tar as bonding carbon, wood powder, ammonium chloride, etc. As a foaming agent, the porous carbon material is prepared by calcining and carbonizing at 1100°C after mixing the ingredients and molding. Wide pore size distribution (1-200μm), low filtration precision, limited application in high-pressure filtration and fine filtration

Although this method can increase the bulk density and enhance the strength, it also significantly reduces the open porosity, so the filtration rate is low, which is not conducive to filtration