A kind of sandwich structure polyether block amide gel film and its photocrosslinking preparation method

Abstract

The invention belongs to the technical field of gas film separation and relates to a polyether block amide gel film with a sandwich structure and a photo-crosslinking preparation method thereof. The film is characterized in that the film has the sandwich structure, the upper and lower surfaces are arranged as crosslinking layers and the middle layer is arranged as a gel layer. The preparation method comprises the following steps: (1) uniformly mixing polyether block amide, ionic liquid and solvent at a certain temperature, paving on a polyfluortetraethylene plate, and drying to remove the solvent so as to obtain the gel film; (2) coating upper and lower surfaces of the gel film with a layer of solution containing photoinitiator and cross-linking agent, transferring into an ultraviolet light curing machine for curing for 20 minutes and carrying out the surface photo-crosslinking reaction of the gel film; (3) drying the gel film after photo-crosslinking in air for 24 hours, and then transferring into a vacuum drying oven and treating for 24 hours at 30 DEG C, thereby acquiring the polyether block amide gel film with the sandwich structure. According to the preparation method provided by the invention, the upper and lower surfaces of the film are subjected to photo-crosslinking so as to form the polyether block amide gel film with the sandwich structure, so that the ionic liquid is difficult to run off, the lasting stability of the physical structure and property of the film is ensured and the film is fit for the separation of carbon dioxide in the mixed gas and the recycling of the organic steam.

Description

technical field

[0001] The invention belongs to the technical field of gas membrane separation, and relates to a sandwich-structured polyether block amide gel membrane and a photocrosslinking preparation method thereof. Background technique

[0002] current atmospheric CO 2 Concentrations continue to rise, and the greenhouse effect is intensifying, posing a serious threat to the ecological environment on which human beings depend. Conventional CO 2 Separation technologies, such as amine aqueous solution absorption method, cryogenic separation method and pressure swing adsorption method, are accompanied by high energy consumption, high operating costs, and the possibility of secondary pollution in the process of realizing gas separation. Therefore, membrane separation technology, which has many advantages such as economy, high efficiency, and environmental protection, has received more and more attention in the field of gas separation.

[0003] Gel membrane is a new type o...