Pleated filter element microporous membrane sol-gel method

Pleated filter element microporous membrane sol-gel method The pore size of inorganic ceramic membrane manufactured by Sol-gel method can reach (10-1000)*10-10m, generally alumina membrane, zirconia membrane, titanium oxide membrane, silicon dioxide membrane and zeolite membranes can be prepared by this method. The So1-gel method is also an important method for the preparation of ultrafiltration membranes and gas separation membranes. The So1-gel method usually uses A1(OC3H7)3, A1(OC4H9)3, Ti(i-OC3H7)4, Si(OC3H5)4, si(OCH3)4 or metal inorganic salts such as A1C13 as raw materials, dissolved in organic solvents Then, it is hydrolyzed in water by rapid stirring. After hydrolysis and dealcoholization, a stable sol is formed at 90-100 degrees and PH<1.1. Then, the sol is dip-coated on the porous support and dried at a certain humidity and temperature to make the sol. It is transformed into a gel film, and an inorganic porous film with ceramic properties is obtained after the gel film is heat-treated. By strictly controlling the hydrolysis temperature of the alkoxide, the drying temperature and humidity of the sol and gel, and the heat treatment temperature and heating rate of the gel, membranes with narrow pore size distribution and large porosity can be obtained. For example, the preparation of R-A12O3 film is as follows. Raw material: A1(OC3H7)3 or A1(OC4H9)3 Method: control the temperature of alkoxide hydrolysis to perform hydrolysis above 80 degrees, and then form at 90-100 degrees and PH<1.1 Stable sol, then coat the Ai00H sol with a depth of 0.7-1.2mol/L on the support, control the temperature and humidity to form a film, and then slowly heat up, generally controlled at 10 degrees/H, to form a uniform pore size , when the temperature reaches 400 degrees, y-a1ooh is converted into r-a122o3 microporous membrane, and when the temperature reaches 800 degrees, a uniform pore size can be formed.

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