Composite structure filter felt and its preparation method and application

The invention belongs to the technical field of filter materials and discloses a composite structure filter felt and its preparation method and application. The composite structure filter felt is composed of a filtering function layer and protective layers coating the upper and lower surfaces of the filtering functional layer. The filtering function layer is prepared from a regenerated fiber layer containing 3D crimped structural fibers and an electrospinning nano-fiber layer through compounding. The composite structure filter felt has a fluffy filtering material skeleton structure of renewable micrometer fibers containing 3D crimped structural fibers and utilizes secondary electrospinning nanofibers attached to the micrometer fibers so that a high fiber specific surface area is obtained. The filter felt has the advantages of high filtration efficiency, low resistance and environmental friendliness. 本发明属于过滤材料技术领域，公开了种复合结构过滤毡及其制备方法和应用。所述复合结构过滤毡由过滤功能层和包覆在过滤功能层上、下表面的保护层构成，其中过滤功能层由具有三维卷曲结构纤维的再生纤维层和静电纺丝纳米纤维层复合而成。本