Method for preparing organic-inorganic hybrid film

Abstract

The invention discloses a method for preparing an organic-inorganic hybrid film. The method comprises the following steps: 1, diluting alkoxysilane in anhydrous ethanol, gradually dropwise adding appropriate amounts of deionized water and a weak acid or a weak base to adjust the pH value for hydrolysis, heating the obtained solution to 40-70 DEG C while sufficiently stirring, performing intense stirring at a constant temperature for 8-16 h to fully hydrolyze the solution, and cooling the hydrolyzed solution to room temperature; 2, adding a small amount of an organic polymer to the obtained solsolution to change the viscosity of the sol, and adding an appropriate amount of a plasticizer to adjust the plasticity of the sol; 3, coating a multilayer support with the sol in a dip-coating manner for 10 s; and 4, carrying out constant-temperature and constant-humidity drying on the coated multilayer support at a temperature of 20-50 DEG C and a humidity of 30-90% for 6-72 h, slowly raising the temperature to 200-500 DEG C, and calcining the multilayer support under the protection of an inert gas for 2-6 h to prepare the organic-inorganic hybrid film.

Description

technical field [0001] The invention relates to the technical field of preparation of organic-inorganic hybrid membranes, in particular to a preparation method of organic-inorganic hybrid membranes. Background technique [0002] Pervaporation is an efficient and clean new membrane separation technology for the separation of liquid mixtures. In the process of pervaporation, the vapor partial pressure difference of each component on both sides of the membrane is used as the driving force, and the separation of the mixture is achieved by relying on the different dissolution and diffusion speeds of each component in the membrane. The separation effect is not affected by the component vapor. -The limitation of liquid balance, especially suitable for the separation and purification of near-boiling and azeotropic organic mixture solutions that are difficult to separate or cannot be separated by traditional techniques such as rectification; and in the process of pervaporation, onl...

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Problems solved by technology

Both of these two patent applications doped inorganic nanoparticles into the organic matrix to obtain an organic-inorganic hybrid membrane. Although this mechanical doping improves the separation performance and thermal stability of the membrane, this hybridization is only mechanical mixing. , the doped nanoparticles and the organic host only have secondary bond interactions such as van der Waals force and hydrogen bond, the interaction force is weak, and the hybridization at the molecular level has not been realized. The performance of the membrane is basically limited by the host material of the membrane, so this kind of The separation performance of non-molecular-level hybrid membranes is still low and the stability is not good enough

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