Porous nylon fiber and preparation method and application thereof

The invention discloses a porous nylon fiber, a preparation method thereof and application thereof. The porous nylon fiber consists of a solid core and a shell, has the porosity of 5 to 45 percent, the average pore size of 8 to 22nm and the specific surface area of 1.5 to 15m /g. The porous nylon fiber can serve as a heat-insulating material.