Preparation method for hydrophobic modified nano-calcium carbonate filled silicone rubber composite membrane

Abstract

The invention discloses a preparation method for a hydrophobic modified nano-calcium carbonate filled silicone rubber composite membrane. The preparation method comprises the following steps: (1) adding dried nano-calcium carbonate into a modifier, stirring for reaction, repeatedly cleaning by using a solvent, namely n-hexane, removing the excess modifier, drying in vacuum, and grinding to obtain hydrophobic modified nano-calcium carbonate; (2) dissolving dried polyvinylidene fluoride in triethyl phosphate, stirring uniformly, filtering, standing, defoaming, scraping a membrane on polyester non-woven cloth, and naturally airing to obtain a polyvinylidene fluoride base membrane; and (3) dissolving polydimethylsiloxane in n-hexane, stirring uniformly, adding hydrophobic modified nano-calcium carbonate, performing ultrasonic dispersion, adding a crosslinking agent and a catalyst, stirring for reaction, performing centrifugation, defoaming to obtain a casting membrane solution, pouring the casting membrane solution on the polyvinylidene fluoride base membrane and scraping a membrane on the polyvinylidene fluoride base membrane, airing, and drying in the vacuum. According to the composite membrane prepared by the preparation method, the process is simple, the cost is low, and the prior butanol penetration capability is high.

Description

technical field [0001] The invention relates to a preparation method of a hydrophobically modified nano-calcium carbonate-filled silicon rubber composite membrane used for pervaporation preferentially permeating butanol, and belongs to the field of pervaporation membrane separation. Background technique [0002] Affected by the energy crisis, oil prices have risen, butanol, as a new type of bioenergy, has received more and more attention. The product of butanol produced by biological fermentation (ABE fermentation) mainly contains acetone, butanol and ethanol, and the ratio of the three is 3:6:1. Mainly due to the inhibition of the product butanol, the total solvent concentration in the fermentation broth can only reach about 20gL -1 , lower production capacity. In order to solve the above problems, scientists try to combine some separation methods, such as pervaporation (PV), adsorption, liquid-liquid extraction, gas stripping and reverse osmosis, etc. (Ezeji, T.C., N. Qu...

AI Technical Summary

Problems solved by technology

[0005] Although the silicone rubber membrane has good selectivity, its own film-forming property and mechanical properties are poor. Filling inorganic particles (such as molecular sieves, zeolites, etc.) An important development direction in the field of chemical film

However, key technical problems such as uneven dispersion of inorganic particles and poor interaction between organic layers and inorganic particles during the film-making process limit its further application.