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High-flux ceramic filter membrane and preparation method thereof

A ceramic filter membrane, high-flux technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problem of low bonding strength between the filter layer and the support, difficult control of membrane thickness and membrane pore size, and pore size distribution Problems such as greater influence of fibers, to achieve the effects of easy production, accurate control of thickness, and improved flux

Inactive Publication Date: 2020-12-08
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these methods have some shortcomings, such as the ubiquitous membrane thickness and membrane pore size are not easy to control, and the aforementioned firing of the sacrificial intermediate layer is likely to cause cracking of the filter layer, and the rapid drying process of the coating solution in the thermal coating method is prone to cracks defects, the bonding strength between the fiber filter layer and the support is relatively low, and the pore size distribution is greatly affected by the fiber, etc.

Method used

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  • High-flux ceramic filter membrane and preparation method thereof
  • High-flux ceramic filter membrane and preparation method thereof
  • High-flux ceramic filter membrane and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] 1) Coat PVB solution (concentration 5%, solvent is absolute ethanol) on the flat glass plate of surface with automatic coating machine, coating film thickness is 15 μ m, dry 30min at room temperature and promptly obtain polymer base film;

[0042] 2) will D 50760nm alumina powder (9g), deionized water (30g), silicone oil-based defoamer (0.12g), fluorocarbon surfactant (0.18g) and PAA dispersant (0.36g) were mixed and ball milled for 15min. Then add the PVA solution (21g) that concentration is 10wt%, ball mill 15min and vacuumize, obtain ceramic film coating liquid;

[0043] 3) Coating the ceramic film coating solution on the polymer base film with an automatic film coating machine, the coating thickness is 25 μm; after drying at room temperature for 12 hours, a ceramic film transfer film with a double-layer structure is obtained;

[0044] 4) Separate the ceramic film transfer film from the glass plate, and wet the ceramic support body for later use; the ceramic support...

Embodiment 2

[0048] 1) PVB solution (concentration 5wt%, solvent is absolute ethanol) is coated on the flat glass plate of surface with automatic coating machine, coating film thickness is 15 μ m, and promptly obtains polymer bottom film at room temperature drying 30min.

[0049] 2) will D 50 760nm alumina powder (9g), deionized water (30g), silicone oil-based defoamer (model Sn-1340, Japan Nopco) (0.12g), fluorocarbon surfactant (model FS-60, Shanghai Shipbang Industrial Co., Ltd.) (0.18g) and PAA dispersant (0.36g) were mixed and ball milled for 15min, and then a PVA solution (21g) with a concentration of 10wt% was added, ball milled for 15min and vacuumized to obtain a ceramic film coating liquid;

[0050] 3) Coating the ceramic film coating solution on the polymer base film with an automatic film coating machine, the coating thickness is 40 μm, and after drying at room temperature for 12 hours, a ceramic film transfer film with a double-layer structure is obtained;

[0051] 4) Separat...

Embodiment 3

[0055] 1) Coat PVB solution (concentration 5%, solvent is absolute ethanol) on the flat glass plate of surface with automatic coating machine, coating film thickness is 15 μ m, dry 30min at room temperature, promptly obtain polymer base film;

[0056] 2) will D 50 Mix 500nm zirconia powder (10.2g), deionized water (25.8g), silicone oil-based defoamer (0.12g), fluorocarbon surfactant (0.18g) and PAA dispersant (0.36g) and ball mill for 15min , then adding a concentration of 10% PVA solution (24g), ball milled for 15min and vacuumized to obtain a ceramic membrane coating solution;

[0057] 3) Coating the ceramic film coating solution on the polymer base film with an automatic film coating machine, the coating thickness is 25 μm, and drying at room temperature for 12 hours to obtain a ceramic film transfer film with a double-layer structure;

[0058] 4) Separate the transfer film from the glass plate, and wet the ceramic support for later use; the ceramic support used is made of...

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Abstract

The invention belongs to the technical field of ceramic filter membrane materials, and discloses a high-flux ceramic filter membrane and a preparation method thereof. The method comprises the following steps: 1), processing a polymer material into a membrane to obtain a polymer base membrane; 2), uniformly mixing ceramic particles, a binder and water to obtain a ceramic membrane coating solution;3), coating the polymer base membrane with the ceramic membrane coating solution , and performing drying to obtain a ceramic membrane transfer membrane; and 4), bonding a membrane layer formed by theceramic membrane coating solution in the ceramic membrane transfer membrane with a support body, performing drying, discharging glue, and performing sintering to obtain the ceramic filter membrane. According to the method, the pore diameter and the thickness of the filter membrane can be accurately controlled, membrane layer infiltration is avoided, the membrane flux is improved, and the defects of the ceramic filter membrane are reduced. The ceramic filter membrane obtained by the method provided by the invention has high membrane flux, the filter layer has no cracks, and the filter layer andthe support body have good bonding strength. The method is simple and easy to produce.

Description

technical field [0001] The invention belongs to the technical field of ceramic filter membrane materials, and in particular relates to a high-throughput ceramic filter membrane and a preparation method thereof. Background technique [0002] Ceramic filter membrane has the characteristics of high thermal stability, corrosion resistance, long life, etc. It has many applications in food processing industry, industrial wastewater treatment, etc., and has the potential to treat urban sewage and prepare drinking water on a large scale. Commercial ceramic filter membranes are mainly made of α-Al 2 o 3 Material preparation support, Al 2 o 3 , ZrO 2 or TiO 2 Prepare the filter layer. However, the preparation cost of ceramic filter membrane is relatively high, which limits its wide application. The flux of the ceramic filter membrane is one of its key properties. Under the same working pressure and time, the greater the flux of the ceramic filter membrane, the higher the filtra...

Claims

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Application Information

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IPC IPC(8): B01D71/02B01D69/02B01D67/00
CPCB01D67/0039B01D69/02B01D71/025
Inventor 吴建青尹晓琴
Owner SOUTH CHINA UNIV OF TECH
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