Composite pore nuclear pore filter membrane and preparation method thereof

Abstract

The invention relates to the field of precise separation, in particular to a composite pore nuclear pore filter membrane and a preparation method thereof. A filter membrane base material is selected from a polyethylene terephthalate (PET) or polycarbonate (PC) polyester film, and the thickness is between 20 and 30 micrometers; and a nuclear pore is a compost pore formed by sleeving a plurality ofmicropores in a macropore, the pore diameter phi of the macropore ranges from 8 to 12 micrometers, and the pore diameter phi of each micropore ranges from 1 to 5 micrometers. The method for preparingthe nuclear pore filter membrane comprises the following steps of: irradiating two sides of the polyester film by using two high-energy ions with different kinds of quality and energy, coating a layer of thin oil film on one side of the polyester film, performing ultrasonic oscillation, and etching the film in an alkaline mode. The nuclear pore filter membrane has the characteristics of high flowspeed, large flux, high dirt storage capacity, difficulty of stoppage and low preparation cost; and when used, the composite pore nuclear pore filter membrane is not needed to be matched with a fibrous membrane, and the problem of limited application of the nuclear pore filter membrane due to susceptible dropping of fibers, high adsorptivity, poor high-temperature resistance and the like in the fibrous membrane is solved, so that the nuclear pore filter membrane serving as a high-performance separation material can be widely applied.

Description

technical field [0001] The invention relates to a composite pore nuclear pore filter membrane and a preparation method thereof. Background technique [0002] Nuclear pore membranes, also known as ionic membranes, are based on the principle of solid nuclear track. Compared with other microporous membranes, nuclear pore membranes have the characteristics of uniform pore size, regular pore shape, smooth surface, good chemical stability, and high mechanical strength. , It has been applied in electronics, chemical industry, food, brewing, pharmaceutical, medical and other industries. Nuclear pore membrane is a high-tech developed after the 1960s. It is a new type of filter membrane used for precision filtration and sieving of particles. [0003] The preparation process of the traditional nuclear pore filter membrane is: use high-energy ion irradiation to form a damaged area, and then form holes after appropriate chemical etching. By controlling the irradiation and etching parame...

AI Technical Summary

Problems solved by technology

[0004]The main purpose of the present invention is to provide a self-contained pre-filter function, which does not need to be equipped with a pre-filter fiber membrane to solve the problem of poor dirt-holding capacity and easy Problems such as easy fiber shedding, high adsorption and poor high temperature resistance caused by clogging and the pre-filter fiber membrane matched with it