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A method for preparing ceramic microfiltration membrane in one step based on cross-linking reaction and the product thereof

A ceramic microfiltration and cross-linking reaction technology, applied in the field of ceramic membranes, can solve the problems of difficult control of membrane defects, increased separation resistance, low pure water permeability, etc., and achieves controllable membrane thickness, good bonding, and simplification. The effect of craftsmanship

Active Publication Date: 2021-12-14
JINGDEZHEN CERAMIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in this traditional preparation process, the transition layer will not only increase the separation resistance, but also the process is complicated and the defects of the film layer are difficult to control, and there are shortcomings such as uneven film layer, leakage of the separation layer, and low permeability of pure water.

Method used

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  • A method for preparing ceramic microfiltration membrane in one step based on cross-linking reaction and the product thereof
  • A method for preparing ceramic microfiltration membrane in one step based on cross-linking reaction and the product thereof
  • A method for preparing ceramic microfiltration membrane in one step based on cross-linking reaction and the product thereof

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Embodiment 1

[0028] In this embodiment, a method for preparing a ceramic microfiltration membrane in one step based on a cross-linking reaction, the steps are as follows:

[0029] (1) Preparation of separation membrane coating solution

[0030] The raw material composition of the separation membrane coating solution is: α-Al with a particle size D50 of 0.2 μm 2 o 3 25wt% powder, 30wt% PVA solution with a concentration of 12%, 45wt% water, and dispersant DOLAPIX CE 64 in an amount of 0.2wt% of the total amount of the above components; first add the above dispersant to water, and then add α-Al 2 o 3 After the powder forms a mixed liquid, ultrasonically disperse for 1 h; then add the above PVA solution at room temperature to form a suspension; disperse the suspension by ball milling for 5 h to obtain a separation membrane coating liquid;

[0031] (2) Support body pretreatment

[0032] Immerse the flat ceramic membrane support body in a 0.5% borax solution for 2 s, take it out and dry it a...

Embodiment 2

[0037] In this embodiment, a method for preparing a ceramic microfiltration membrane in one step based on a cross-linking reaction, the steps are as follows:

[0038] (1) Preparation of separation membrane coating solution

[0039] The raw material composition of the separation membrane coating solution is: α-Al with a particle size D50 of 0.3 μm 2 o 3 20wt% powder, 30wt% PVA solution with a concentration of 12%, 50wt% water, and dispersant DOLAPIX CE 64 in an amount of 0.3wt% of the total amount of the above components; first add the above dispersant to water, and then add α-Al 2 o 3 After the powder forms a mixed liquid, ultrasonically disperse for 2 h; then add the above PVA solution at room temperature to form a suspension; ball mill and disperse the suspension for 3 h to obtain a separation membrane coating liquid;

[0040] (2) Support body pretreatment

[0041] Immerse the flat ceramic membrane support body in a 1% borax solution for 2 s, take it out and dry it at 80...

Embodiment 3

[0045] In this embodiment, a method for preparing a ceramic microfiltration membrane in one step based on a cross-linking reaction, the steps are as follows:

[0046] (1) Preparation of separation membrane coating solution

[0047] The raw material composition of the separation membrane coating solution is: ZrO with a particle size D50 of 0.4 μm 2Powder 30wt%, concentration of 12% PVA solution 25wt%, water 45wt%, and dispersant DOLAPIX CE 64 with an amount of 0.1wt% of the total amount of the above composition; first add the above dispersant to water, then add ZrO 2 After the powder forms a mixed liquid, ultrasonically disperse for 1.5 h; then add the above PVA solution at room temperature to form a suspension; disperse the suspension by ball milling for 4 h to obtain a separation membrane coating liquid;

[0048] (2) Support body pretreatment

[0049] Immerse the flat ceramic membrane support body in a 1% borax solution for 2 s, take it out and dry it at 75 °C for 10 min to...

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Abstract

The invention discloses a method for preparing a ceramic microfiltration membrane in one step based on a cross-linking reaction. Firstly, a separation membrane coating solution is prepared by using metal oxide powder and PVA as raw materials, and a support body is immersed in a borax solution for pretreatment; The pretreated support body is dipped into the separation membrane coating solution in a one-time dip coating method, and the separation membrane layer is directly covered on the large-pore support body by using the cross-linking effect of PVA and borax to prepare a ceramic microfiltration membrane. In addition, the product prepared by the above-mentioned preparation method is also disclosed. The invention simplifies the preparation process, and the film layer has high flatness, which well solves the problems of uneven film thickness caused by multiple coating films in the prior art; at the same time, it effectively improves the performance of the ceramic microfiltration membrane and can be widely used Used in oil-water separation, sewage treatment and other industries.

Description

technical field [0001] The invention relates to the technical field of ceramic membranes, in particular to a method for preparing a ceramic microfiltration membrane and a product thereof. Background technique [0002] Separation membrane is considered as a new separation technology with high efficiency and energy saving. The basic principle is that according to a certain range of membrane pore size, the pressure difference on both sides of the membrane is used as the driving force, and the membrane is used as the filter medium. Under a certain pressure, when the feed liquid flows through the surface of the membrane, only water, inorganic salts, etc. Small molecular substances pass through the membrane to prevent the passage of large molecular substances such as suspended solids and glue in water, so as to achieve the purpose of separation and purification. At present, the ceramic membrane in the prior art usually consists of three layers: a support body, a transition layer,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/38B01D69/10B01D67/00
CPCB01D71/38B01D69/10B01D67/0079
Inventor 汪永清张利剑常启兵张小珍胡学兵徐泽跃
Owner JINGDEZHEN CERAMIC UNIV
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