Hourglass type pore channel nuclear pore filtering film and preparation method thereof

Abstract

The invention relates to a preparation method for a nuclear pore filtering film and particularly relates to the nuclear pore filtering film with an hourglass type pore channel shape. The invention provides an hourglass type pore channel nuclear pore filtering film and a preparation method thereof. The preparation method comprises the following steps: radiating a PET (Polyethylene Terephthalate) or PC (Polycarbonate) thin film by heavy ions provided by a high-energy accelerator to form a latent trace; selecting a NaOH etching solution and carrying out pre-etching on a radiated polymer thin film; putting the film into a constant-temperature box with a certain temperature and annealed; finally, etching by using a NaOH solution. The hourglass type pore channel nuclear pore filtering film comprises a nuclear pore which is formed on the polymer thin film by radiating and etching through the heavy ions; the section of a pore channel of the nuclear pore is similar to an hourglass shape. The polymer thin film is the PET / PC thin film; the thickness is 10-30 microns; the range of the pore diameter of an outer pore is 2-10 microns and the range of the pore diameter of an inner pore is 0.2-3 microns. Compared with columnar and tapered pore shapes, an hourglass type pore channel can improve the filtering speed except the previous filtering precision is kept; meanwhile, the dirt containing capability of the nuclear pore filtering film is improved and the nuclear pore filtering film is not easy to block, so that the filtering performance of the nuclear pore filtering film is improved.

Description

technical field [0001] The invention relates to a preparation method of a nuclear pore filter, in particular to a nuclear pore filter with an hourglass channel shape. The nuclear pore filter membrane prepared by this method can be applied to filter membrane industries such as medical filtration, food packaging, electronic product protection, and battery separators. Background technique [0002] Nuclear pore membrane, also known as nuclear pore membrane or heavy ion microporous membrane, is a sieving filter membrane with the advantages of regular pore shape, controllable pore size and uniform pore size. At present, nuclear pore filter membranes are mainly used in medical filter membranes, anti-counterfeiting, battery separators, biological detection membranes and other fields. [0003] The pore shapes of existing nuclear pore filter membranes mainly include columnar, double-conical and single-conical, and the production process mainly includes two processes of original membr...

AI Technical Summary

Problems solved by technology

Its shortcoming is to have two points: the first, the filtering speed of nuclear pore membrane is little

The second point is that the nuclear pore filter membrane is easy to block and has certain requirements for the turbidity of the original solution. It usually needs to be used in combination with other fiber filter membranes.

This greatly affects the use conditions and service life of nuclear pore membranes

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