Preparation process of UPE filter membrane

Abstract

The invention provides a preparation process of a UPE filter membrane. The process comprises the following steps: preparing a mixed material, wherein the mixed material comprises polyethylene resin and a solvent system, the polyethylene resin at least comprises ultra-high molecular weight polyethylene with a mass average molecular weight of more than 3 million, and the solvent system comprises a solvent compound A and a non-solvent compound B; then heating, melting and mixing the mixed material to form a membrane casting solution; extruding through a die head to form a liquid membrane, wherein along with the reduction of the environment temperature, the liquid membrane is subjected to split-phase curing to form two raw membranes with holes in the outer surfaces different in aperture size; and carrying out synchronous stretching, first heat setting, extraction and second heat setting on the raw membrane to obtain the UPE filter membrane with the required membrane structure. According to the invention, the UPE filter membrane is an asymmetric membrane, has excellent trapping performance on impurity particles with the particle size of 1-30 nm, and is high in interception efficiency; the filtering speed is high, the time required for fluid to pass through the filter membrane is short, and the time cost is low; and the UPE filter membrane is especially suitable for the field of photoresist.

Description

technical field [0001] The invention relates to the technical field of membrane materials, in particular to a preparation process of a UPE filter membrane. Background technique [0002] Polymer filter membrane is a kind of film made of organic high molecular polymer according to a certain process. The membrane mainly plays the role of filtration and separation. With the development of petroleum industry and science and technology, the application field of polymer filter membrane is continuously expanding. At present, the application fields include gas separation, seawater desalination, ultrapure water preparation, sewage treatment, artificial organ manufacturing, medicine, food, Agriculture, chemical industry and other aspects; according to the different raw material polymers, polymer membranes can be divided into cellulose polymer membranes, polyamide polymer membranes, polysulfone polymer membranes, polyolefin membranes polymer membranes, etc. [0003] Polyolefin polymer...

AI Technical Summary

Problems solved by technology

[0003] Polyolefin polymer filter membranes mainly refer to polyethylene filter membranes, polypropylene filter membranes and other olefin filter membranes. Due to their excellent physical and chemical properties, they have a wide range of applications; for example, ultra-high molecular weight polyethylene (UPE) Filter membranes are usually used in photolithography processing and "wet etching and cleaning" (WEC) applications; Polyethylene filter membrane, which has excellent trapping performance for impurity particles with a particle size of about 10-50nm, and has a long service life, and its flux can remain relatively stable during long-term use; but Since the membrane is a symmetrical membrane, while ensuring the retention efficiency, the flux of the membrane cannot be guaranteed, so that the flux of the membrane is small, which leads to a long time for the fluid to pass through the membrane, that is, filtration The rate is small and the time cost is too large, which also limits the development of polyethylene filter membranes to a certain extent

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