Preparation method of waterproof moisture-permeable nanofiber composite membrane

Abstract

The invention relates to a preparation method of a waterproof moisture-permeable nanofiber composite membrane, and belongs to the technical field of textile materials. According to the preparation method, polyacrylonitrile is taken as a main raw material, polyvinylidene fluoride and polyurethane are added, the waterproof and moisture-permeable nanofiber composite membrane is prepared, and the waterproof and moisture-permeable membrane prepared from polyacrylonitrile nanofibers has the characteristics of high porosity, fine fiber diameter and small pore diameter. The waterproof and moisture-permeable effect of the fiber membrane is effectively improved, the hydrophobic microporous membrane is preliminarily obtained by blending polyacrylonitrile, polyvinylidene fluoride and polyurethane through a solution, the waterproof moisture-permeable membrane with a certain welding structure is obtained in combination with heat treatment, penetration of liquid water is effectively prevented, polyurethane is a block polymer, polar groups such as hydrophilic groups which exist on a macromolecular chain segment provide a carrier for water vapor transfer, meanwhile, the polyurethane has a certain hydrophobic property by the hydrophobic group on the chain segment, and by addition of the polyurethane, the nanofiber composite membrane has excellent comprehensive performance.

Description

technical field

[0001] The invention relates to a preparation method of a waterproof and moisture-permeable nanofiber composite membrane, which belongs to the technical field of textile materials. Background technique

[0002] Firefighting clothing is a special functional clothing that protects the personal safety of first-line rescuers. Its function is to prevent various forms of heat (convection heat, conduction heat, radiation heat and hot steam, etc.) Typical domestic fire-fighting thermal protective clothing has a multi-layer structure, which is a heat insulation layer, a vapor barrier layer, and a flame-retardant outer layer from the inside to the outside. Among them, the steam barrier layer is composed of waterproof and moisture-permeable membrane and the underlying fabric. Its function is to prevent the external high-temperature fire-fighting water from penetrating into the inner layer of the clothes and scald the human body, and it can also allow the sweat vapor of...