Membrane with reduced particle formation
A particle and surface technology, which is applied in the field of membranes to reduce particle formation, and can solve problems such as particle shedding and filter efficiency reduction.
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example 1
[0060] A polyethersulfone membrane was formed by creating a solution containing 13.9 wt% polyethersulfone, 45.5 wt% n-methylpyrrolidone, and 40.6 wt% propionic acid. Cast the solution on a surface covered with a hydrophobic membrane A's mobile belt. The solution was passed through an immersion water bath at a temperature of about 25°C. The formed membrane is asymmetric and has a hydrophobic A The tight side of the film and the contact hydrophobic A The open side of the film. figure 2 It is a picture of the opening-side surface of the film taken at a magnification of 5,000 with a SEM (scanning electron microscope).
example 2
[0062] Polyethersulfone membranes were formed using the same method as in Example 1, except that the solution was cast on a 462 film on the moving belt. The formed membrane is asymmetric and has a tight side facing away from the hydrophilic membrane and an open side touching the hydrophilic membrane. Unexpectedly, the open side of the film had an imperfect skin with a thickness of about 0.5 microns. Figure 3A It is a picture of the opening-side surface of a film having a surface layer taken with a SEM at a magnification of 10,000. It can be seen that there are pores on the surface of the surface layer. Figure 3B is a cross-sectional view of the open side of the membrane showing the surface layer taken with SEM at a magnification of 10,000. Surface layers are shown at the bottom of the picture. Figure 3Cis a picture of the tight side surface of the membrane taken with a SEM at a magnification of 10,000. Figure 3D is a cross-sectional view of the tight side of the memb...
example 3
[0064] Polyethersulfone membranes were formed using the same method as in Example 2, except that the solution was cast on a hydrophilic film covered with 15.5 wt% polyethersulfone, 44.4 wt% n-methylpyrrolidone, and 40.1 wt% propionic acid. of 462 film on the drum. The formed membrane is asymmetric and has a tight side facing away from the hydrophilic membrane and an open side touching the hydrophilic membrane. Unexpectedly, the open side of the membrane had a skin layer with a thickness of about 0.5 microns. Such as Figure 4A as shown in Figure 4A It is a picture of the opening-side surface of a film having a surface layer taken with a SEM at a magnification of 10,000. It can be seen that there are pores on the surface of the surface layer. Figure 4B is a cross-sectional view of the open side of the membrane showing the surface layer taken with SEM at a magnification of 10,000. The surface layer is shown at the bottom of the picture. Figure 4C is a picture of the t...
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Abstract
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