| 摘要 |
A method for preparing a microporous diaphragm by means of multilayer coextrusion and unilateral stretching. Functional layers (1, 3) with added inorganic filler or other pore-forming filler and a polyolefin microporous membrane (2) are compounded by means of multilayer coextrusion for casting pieces, a multilayer composite microporous membrane precursor is molded at one step, and then the composite membrane precursor is subjected to heat treatment, multilayer compounding and unilateral stretching to obtain a high-performance microporous membrane. The method is perfect in technology, high in production efficiency, free from pollution, low in cost and beneficial to large-scale production; furthermore, after the method is adopted, the pore size and distribution of a microporous membrane are easily adjusted; and the microporous membrane obtained by the method is uniform in pore size distribution. |
