How the microporous technology of waterproof and breathable membrane creates a microporous structure

Stretching method: First, the polymer film is heated, then plastically deformed under the action of stretching force, and finally rapidly cooled and fixed to form a porous structure. This method is called stretching, also known as mechanical stretching or uniaxial stretching.

Phase separation method: By controlling the phase separation process of the polymer, tiny phase regions are formed inside the polymer, and then these phase regions are processed to form a microporous structure. Phase separation methods can be divided into water phase separation methods and oil phase separation methods.

Thermal phase separation method: blend the polymer and paraffin solution, then heat it to near the melting point of the polymer to cause melt flow, then rapidly cool and solidify, and finally heat treat the polymer film to evaporate the paraffin, leaving Microporous structure.

Chemical etching method: Use chemical reagents to react with the surface of the polymer film to etch away part of the material to form a microporous structure.

Plasma etching method: uses ions and active gases in the plasma to bombard the surface of the polymer film, causing physical and chemical changes on the surface to form a microporous structure.