Method for preparing filter membrane mesh structure by laser interference photoetching technology

Abstract

The invention discloses a method and a system for preparing a filter membrane mesh structure by laser interference photoetching technology. The system can generate images with different intervals by different exposure methods of the laser interference photoetching technology. A photoetched image is generated by regulating and controlling light intensity distribution in an interference field by a specified light beam combination method, and ablating the surface of a processed material by using modulated redistributed laser energy. The system consists of a laser, a beam expander, a beam splitter, a reflecting mirror, a polaroid and a mechanism for clamping and regulating the optical elements and devices. By changing the relative arrangement position of the optical devices, an incident angle of a related light beam which is irradiated on the surface of a substrate material is changed so as to regulate parameters of a micro-mesh structure of the surface of the processed material. The system can realize adjustability of photoetching characteristic sizes from nanometers to hundreds of microns. By optical phase shifting or mechanical shifting of a sample, repeated exposure or repeated exposure interpolation, a high-density micro-nano filter membrane mesh structure can be prepared.

Description

technical field [0001] The invention relates to a method and a system for manufacturing a filter membrane mesh structure, which belongs to the improvement and expansion of the filter membrane preparation technology. technical background [0002] Membrane filtration technology has great application value in drug screening, water quality monitoring, environmental engineering and so on. The core element of this technology is a large number of mesh structures with strong size selectivity, which can play the role of microfiltration, ultrafiltration and nanofiltration according to different needs. [0003] The current filter membranes are classified according to the size of the particles that can intercept raw water. The membrane pores are divided into microfiltration membrane (MF), ultrafiltration membrane (UF), nanofiltration membrane (NF) and reverse osmosis membrane (RO) from coarse to fine. There are three types of molding materials: fiber, synthetic resin and ceramic. Fibe...

AI Technical Summary

Problems solved by technology

The above methods for making the mesh structure of the filter membrane are all directly prepared by chemical and physical methods, which makes the parameters of the mesh structure poorly controllable, and the manufacturing process is complicated or the cost is high.

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