The invention discloses a manufacturing method of an inner
pressure pipe type multilayer
composite film. The manufacturing method comprises: a, uniformly mixing a film forming
polymer, a film forming
diluent, a film forming penetrant, a film forming pore forming agent and a film forming additive according to a certain
mass percentage ratio, heating to a temperature of 130-390 DEG C with an
extrusion molding machine through a thermally induced phase
separation method, melting, uniformly mixing, extruding with a
pipe type film inner film mold, and cooling to obtain the inner layer film of a
pipe type film; b, weaving a warp and weft mesh
pipe outside the inner layer film by using a warp and weft weaving
machine, wherein it is ensured that the warp and weft mesh pipe is tightly attached to the surface of the inner layer film; c,
coating the inner layer film outer layer attached to the warp and weft mesh pipe with a layer of an outer layer film; and d, extracting the prepared inner
pressure pipe type multilayer
composite film semi-finished product by using
ethanol or isopropanol to obtain the inner
pressure pipe type multilayer
composite film finished product. According to the present invention, the inner pressure pipe type multilayer composite film has advantages of good separation performance, good compounding fastness and good
mechanical property, the area of the effective
filtration membrane can be increased, and the breaking of the film pipe and the damage caused by the separating and the layering between the
filtration membrane layer and the support layer can be effectively avoided, such that the use efficiency and the service life of the film can be improved.