Thin-walled large specification honeycomb ceramic carrier and preparation method thereof

Abstract

The invention discloses a thin-walled large specification honeycomb ceramic carrier and a preparation method thereof. Raw materials of the carrier comprise kaolin, aluminum oxide, silicon dioxide, talc powder, aluminum titanate micropowder and the like. The preparation method comprises the following steps: mixing kaolin, aluminum oxide, silicon dioxide, talc powder, aluminum titanate micropowder,zirconium phosphate and cerous phosphate, and uniformly stirring the mixture to obtain a mixed material; adding glycerin and hydroxypropyl methyl cellulose into water to obtain an additive solution; mixing the mixed material with the additive solution, uniformly stirring the mixture, and carrying out kneading, ageing and vacuum pugging to obtain a pug; and extruding the pug under pressure by meansof a mold to obtain a cylindrical honeycomb ceramic wet blank, and drying and roasting the cylindrical honeycomb ceramic wet blank to obtain the thin-walled large specification honeycomb ceramic carrier. The disc diameter of the thin-walled large specification honeycomb ceramic carrier provided by the invention can reach 300-350 mm, the pore density can reach 300-400 pore / sq. inch, and the thin-walled large specification honeycomb ceramic carrier meets the demand of treating tail gas of a large discharge diesel vehicle.

Description

technical field [0001] The invention relates to the field of preparation of a honeycomb ceramic carrier, in particular to a thin-walled and large-sized honeycomb ceramic carrier and a preparation method thereof. Background technique [0002] With the continuous improvement of the level of industrialization, the share of vehicle exhaust pollution in urban air pollution is getting higher and higher, and vehicle exhaust control technology has great social significance for energy conservation and emission reduction. The monolithic honeycomb is a thin-walled, parallel porous cylinder with large specific surface area, good thermal stability, high temperature resistance and not easy to break. With the expansion of the application of honeycomb ceramic carriers in the catalytic purification industry, and the incomparable advantages of honeycomb ceramics as catalyst carriers, honeycomb ceramics have penetrated into various fields of air pollution prevention and control, especially in ...

AI Technical Summary

Problems solved by technology

[0004] With the increasingly stringent regulations on automobile exhaust emissions, the honeycomb ceramic carrier for automobile exhaust purification is also developing in the direction of high pore density and thinner lattice wall. When using the same mud material as the existing honeycomb ceramic carrier When the thin-walled ceramic carrier is used, since the mud channel becomes much narrower, the extrusion force required for the mud in the mold channel will greatly increase, and at the same time, the mud will not be able to keep up, which will lead to two problems Problem: On the one hand, it will greatly increase the pressure on the mold, aggravate the damage of the mold, and even exceed the pressure range that the mold can withstand; on the other hand, the state that the mud cannot keep up will cause defects in the molded products Lattice walls or simply can not form a continuous qualified product