Leakproof humidifying composite hollow fiber membrane as well as preparation method and application thereof

Abstract

The invention provides a leakproof humidifying composite hollow fiber membrane as well as a preparation method and application thereof. The leakproof humidifying composite hollow fiber membrane comprises an outer hydrophilic layer and an inner hydrophobic layer attached to the inner surface of the outer hydrophilic layer, the outer hydrophilic layer is of a spongy pore structure, the pore diameter of the outer hydrophilic layer becomes smaller from the outer surface to the inner surface, and the thickness of the inner hydrophobic layer of the leakproof humidifying composite hollow fiber membrane is smaller than that of the outer hydrophilic layer. According to the prepared leakproof humidifying composite hollow fiber membrane with the asymmetric structure of the inner hydrophobic layer and the outer hydrophilic layer, the thickness of the inner hydrophobic layer of the membrane is smaller than that of the outer hydrophilic layer, due to the fact that one side of the membrane is hydrophilic and the other side of the membrane is hydrophobic, the membrane shows asymmetric hydrophilic/hydrophobic dual performance, and the membrane is a novel membrane for humidifying treatment of a fuel cell; water molecule capture and permeation are facilitated, and meanwhile water vapor escape is facilitated.

Description

technical field [0001] The invention belongs to the technical field of polymer membranes, and in particular relates to a leak-proof and humidifying composite hollow fiber membrane, a preparation method and an application thereof. Background technique [0002] With the rapid development of society, electrochemical fuel cells are considered to be the most promising new power generation technology in the contemporary era, which can directly convert chemical energy into thermal energy, and have unique advantages such as no noise, environmental protection, high reliability, and easy maintenance. Proton exchange membrane fuel cells can use proton conductive materials as electrolytes, that is, the proton conductivity is closely related to the water content in the proton exchange membrane. When the proton exchange membrane is at low humidity, the conductivity of the proton exchange membrane will drop significantly, resulting in the inability to fully exert the performance of the bat...

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Problems solved by technology

[0004] Aiming at the problems in the prior art that the electrodes are submerged due to the high humidity in the working process of the fuel cell, and the poor humidification effect leads to low power generation efficiency, the present invention aims to provide a leak-proof humidification composite hollow fiber membrane and a preparation method And application thereof; The present invention provides a kind of hollow fiber membrane that utilizes hydrophilic polymer as base material to prepare to have the hydrophilic gradient spongy pore structure of inner dense outer sparse (inner dense outer sparse refers to the distribution of the hole of hollow fiber membrane The inner layer has small pores and high density, and the outer layer has large pores and low density), and then the inner surface is modified by a hydrophobic modifier solution to obtain an inner hydrophobic coating to meet the requirements of water molecule capture, penetration and water vapor escape; The preparation process of the present invention is simple, the material price is low, and no toxic reagents are involved in the experimental process. The obtained anti-leakage and humidification composite hollow fiber membrane with an asymmetric structure of the inner hydrophobic layer and the outer hydrophilic layer can increase the humidity during the working process of the fuel cell humidification system. The wet effect is stable and has a wide range of application values

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