Preparation method of microporous foam material with oriented cells

A preparation method of a microporous foam material with oriented cells, comprising the following steps:

• (1) melting and mixing raw materials for preparing a polymer composite material and then thermally stretching the raw materials to obtain polymer composite fibers;
• wherein the raw materials comprise a polymer matrix, a fiber-forming phase substance and a processing aid;
• (2) arranging the polymer composite fibers prepared in the step (1) in a same direction and then hot-pressing the polymer composite fibers, wherein a hot-pressing temperature is controlled in the hot-pressing process, so that the polymer matrix in the polymer composite fibers is melted, but microfibers in the polymer composite fibers are not melted, thus obtaining a polymer composite board with oriented fibers;
• (3) carrying out a supercritical fluid foaming process on the polymer composite board prepared in the step (2) to obtain a microporous foam material with oriented cells;
• wherein a temperature is controlled in the supercritical fluid foaming process so that the microfibers in the polymer composite board are not melted.