Novel hydrophilic composite tube type microfiltration membrane and preparation method thereof

The present invention discloses a novel hydrophilic composite tube type microfiltration membrane and a preparation method thereof. The novel hydrophilic composite tube type microfiltration membrane comprises a substrate tube type membrane and a PVDF/PMMA membrane, wherein the inner diameter of the substrate tube type membrane is 18-20 mm, the outer diameter of the substrate tube type membrane is 30-32 mm, the substrate tube type membrane is provided plural of filtration holes, and the hole size of the filtration hole is 10-20 [mu]m. The preparation method comprises film preparation liquid preparation, film preparation, film formation post-treatment and other steps. According to the present invention, the PVDF membrane is arranged in the membrane hole, ie., membrane filtration hole in the tube type membrane, such that the problems of too large tube type membrane filtration hole size and pool membrane filtration effect are solved, and the problem that the PVDF membrane easily sheds after being coated on the outer surface of the tube type membrane is effectively solved; and the prepared PVDF membrane can be firmly combined into the membrane filtration hole in the tube type membrane, and the high quality filtration membrane can be effectively formed through the optimizing design of each formula, such that the filtration effect of the whole membrane filtration hole is improved while shedding is not easily generated, and the service life and the market promotion value of the product are substantially improved.