Method for producing inorganic film central layer
An intermediate layer, inorganic membrane technology, applied in the field of chemical engineering, can solve the problems of separation membrane performance damage, membrane cracking, defects, etc., and achieve the effect of narrow pore size distribution and strong generality
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[0017] Specific embodiments of the present invention will be described in detail below in conjunction with technical solutions.
[0018] The preparation of a silicon oxide interlayer on a coarse-porous substrate with an average pore diameter of 2 μm is described below as an example.
[0019] 1. Preparation of SiO with final oxide concentration of 2wt%, 1.5wt%, 1.0wt% 2 Sol gel solution
[0020] Dissolve 10, 7.5, 5, and 2.5g of TEOS in 5g of ethanol respectively, add them dropwise under stirring to 500ml conical flasks containing 173.3, 129.6, 86.4, and 43.2g of deionized water, and then pour them into the conical flasks respectively 0.5 g of concentrated nitric acid was added dropwise to obtain a precursor solution. The precursor solution was hydrolyzed in an ice bath for 1 hour. SiO2 sol solutions of various concentrations were obtained. Thereafter, water was added to 500 ml and 1.5 g of concentrated nitric acid to each sol, boiled under strong stirring, and refluxed for ...
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