A kind of sandwich structure polyether block amide gel membrane and its thermal crosslinking preparation method

Abstract

The invention belongs to the technical field of gas-membrane separation and relates to a polyether-block-amide gel membrane with a sandwich structure and a thermal-cross-linking preparation method thereof. The polyether-block-amide gel membrane is characterized by being provided with the sandwich structure, wherein the upper surface layer and the lower surface are cross-linked layers, and a gel layer is arranged in the middle. The preparation method comprises the following process steps: (1) mixing polyether block amide, ionic liquid and a solvent uniformly at certain temperature, flatly laying the mixture on a polytetrafluoroethylene plate, and drying the solvent to prepare the gel membrane; (2) respectively coating a layer of solution containing a thermal initiator and a cross-linking agent on the upper surface layer and the lower surface layer of the gel membrane, transferring into a baking oven, controlling certain temperature and time, and carrying out surface thermal cross-linking reaction of the gel membrane; and (3) drying the cross-linked gel membrane for 24 hours in the air, then transferring into a vacuum drying box, and treating for 24 hours at the temperature of 30 DEG C to obtain the polyether-block-amide gel membrane with the sandwich structure. The polyether-block-amide gel membrane and the preparation method have the advantages that by cross linking of the upper surface layer and the lower surface layer of the membrane, the polyether-block-amide gel membrane with the sandwich structure is formed, and the loss of polyethylene glycol is not easy, so that the durability and the stability of the physical structure and the properties of the membrane are guaranteed. The polyether-block-amide gel membrane and the preparation method are applicable to separating carbon dioxide in mixed gas and recovering organic vapor.

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 thermal crosslinking 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 typ...