Micro-pore filtering membrane producing technology

Abstract

The invention provides a micro-pore filtering membrane producing technology including the steps of: with polyurethane sponge being uniform in pore size in the prior art, performing thermal-compression to the polyurethane sponge with a high-temperature-resistant board at 150-220 DEG C to form the filtering membrane being 0.5-10 mm in thickness and less than 10 [mu]m in pore size. The producing technology is easy to control, is low in cost, is smoothly breathable and can be cleaned for being recycled. The filtering membrane can be used in an air purifier and such filtering products.

Description

technical field [0001] The invention belongs to the technical field of preparation of environmental protection materials, and in particular relates to a preparation process of a microporous filtration membrane. Background technique [0002] At present, the filter membrane for filtering PM2.5 is mainly made of polytetrafluoroethylene film through mechanical stretching, and tiny cavities are formed between the molecules, so as to achieve the purpose of filtration. However, due to the expensive polytetrafluoroethylene material, the cost is very high. For example, in PM2.5 masks, only the nostrils have filter membranes, and other parts are not breathable, resulting in poor breathing. At the same time, the filter membrane is easy to clog. Most of the standard PM2.5 masks on the market are plug-in, and the filter needs to be replaced after a period of use. [0003] The porous sponge represented by polyurethane sponge is currently used in many fields. It has uniform pores, long li...

AI Technical Summary

Problems solved by technology

However, there is currently no microporous filtration membrane made of polyurethane

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