Solvent-free preparation method of aperture controllable porous film

Abstract

The invention discloses a solvent-free preparation method of an aperture controllable porous film. The process of the method comprises the following steps of: using 1-hydroxy-cyclohexyl phenyl ketone as an initiator, using hexanediol diacrylate as a cross-linking agent, and by ultraviolet light, initiating polymerization cross-linking curing film formation of a film forming monomer hydroxyethyl methacrylate and pore forming silicon dioxide nano particles between two glass sheets; and carrying out pore forming by removing a pore forming agent, i.e. the silicon dioxide particles. The method does not require an organic solvent in the preparation process, is green and has no pollution; and the solvent cost can be saved and a solvent recovery process is not required. The particle size of the prepared silicon dioxide nano particles can be regulated and controlled by the sol-gel process conditions; the aperture of the prepared porous film is consistent with the particle size of the pore forming agent, i.e. silicon dioxide nano particles; and the aperture of the film can be regulated and controlled by regulating the particle size of the silicon dioxide nano particles.

Description

technical field [0001] The invention relates to a solvent-free preparation method of a porous membrane with controllable aperture, belonging to the technical field of membrane separation. Background technique [0002] Commonly used membrane preparation methods (mainly immersion precipitation phase inversion method, solvent evaporation method, etc.) need to use a large amount of organic solvents, and organic solvents mainly play the following two roles in the polymer membrane preparation process. On the one hand, the solvent is used as a dissolution medium, mixed with the film-forming polymer and various additives to form a homogeneous casting solution. On the other hand, the solvent plays an important role in the structure formation of the membrane during the phase inversion process. In the immersion precipitation phase inversion method, a solvent exchange between an organic solvent and a non-solvent (usually water) causes the phase inversion to occur. The organic solvents...

AI Technical Summary

Problems solved by technology

Second, the cost of using organic solvents is higher

Since the mass ratio of organic solvents in the casting solution is usually 60%-90%, the cost is relatively high

Third, the recovery of organic solvents is difficult

Organic solvent recovery is generally recovered by vacuum distillation or rectification. Due to the high boiling point of organic solvents for membrane production and the low concentration of organic solvents in membrane wastewater (usually less than 8%), the recovery energy consumption is high and the recovery economy is poor.

At the same time, due to the biological toxicity and poor biodegradability of organic solvents, the treatment of membrane wastewater is also quite difficult.

[0003] The permeability and selectivity of the membrane are closely related to the pore size. The increase of the pore size will increase the flux, but the increase of the pore size will often result in a decrease in selectivity.

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