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A flexible anti-pollution ceramic membrane and its preparation method

An anti-pollution, ceramic membrane technology, applied in the field of membrane separation, can solve the problems of high production cost, concentration difference polarization, easy pollution, etc., and achieve the effects of reducing preparation cost, improving service life, and strong anti-pollution ability.

Active Publication Date: 2020-12-15
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the uniformity of the pore size distribution of the membrane prepared by this method is not high, and the mechanical strength of the membrane is difficult to be guaranteed; during the process of treating the feed liquid, some components in the treated feed liquid are adsorbed, deposited on the membrane surface, or enter the membrane pores In the process, even the membrane pores are blocked, which greatly increases the permeation resistance of the membrane; as far as the membrane separation process is concerned, once the feed liquid contacts the membrane, the membrane fouling begins; after the operation starts, the phenomenon of concentration difference polarization occurs, especially in the In the case of low flow rate and high solute concentration, when the membrane surface reaches or exceeds the saturation solubility of the solute, a gel layer will form, causing the membrane flux to be independent of the applied pressure, causing a sharp decrease in the membrane flux
[0005] Due to the high production cost, high brittleness and easy pollution of ceramic membranes, many shortcomings seriously affect the use and development of ceramic membranes.

Method used

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  • A flexible anti-pollution ceramic membrane and its preparation method
  • A flexible anti-pollution ceramic membrane and its preparation method
  • A flexible anti-pollution ceramic membrane and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Example 1: This flexible anti-pollution ceramic membrane is prepared by blending-compression molding with the following composition by mass percentage: nano-Al modified by coupling agent 2 o 3 45%, ethylene-vinyl acetate copolymer 46%, sodium bicarbonate 6%, triallyl isocyanurate 3%;

[0027] The nano Al modified by the coupling agent 2 o 3 It is to ultrasonically hydrolyze the aluminate coupling agent in an ethanol solution with a volume concentration of 95% at a pH of 3 for 25 minutes to obtain a hydrolyzate of the aluminate; then add nano-Al 2 o 3 Powder, mix evenly, react at 120°C for 30 minutes, filter, dry the solid, and disperse to obtain modified nano-Al 2 o 3 powder; wherein the amount of aluminate is aluminate and nano-Al 2 o 3 8% of the total mass, nano-Al 2 o 3 The amount of aluminate and nano-Al 2 o 3 92% of the total mass.

[0028] The preparation method of the above-mentioned flexible anti-pollution ceramic membrane:

[0029] (1) At 120°C, th...

Embodiment 2

[0036] Embodiment 2: The flexible anti-pollution ceramic membrane is prepared by blending-compression molding method with the following mass percentage composition: nano-SiO modified by coupling agent 2 40%, ethylene-vinyl acetate copolymer (vinyl acetate content is 40wt.%) 50%, PVA 4%, triallyl cyanurate 6%;

[0037]The nano-SiO2 modified by the coupling agent is to ultrasonically hydrolyze the titanate coupling agent at a pH value of 3.5 in an ethanol solution with a volume concentration of 95% for 30min to obtain a titanate hydrolyzate; then add nano-SiO 2 , mixed evenly, reacted at 100°C for 30 minutes, dried, and dispersed to obtain modified nano-SiO 2 powder; wherein the amount of titanate coupling agent is the coupling agent and nano-SiO 2 10% of the total mass, nano-SiO 2 The amount of coupling agent and nano-SiO 2 90% of the total mass.

[0038] The preparation method of the above-mentioned flexible anti-pollution ceramic membrane:

[0039] (1) At 130°C, nano-SiO...

Embodiment 3

[0046] Example 3: The flexible anti-pollution ceramic membrane is prepared by blending-compression molding method with the following mass percentage composition: nano-TiO modified by coupling agent 2 55%, ethylene propylene rubber 40%, PEG 3%, tricarboxymethylpropane trimethacrylate 2%;

[0047] The nano-TiO modified by the coupling agent 2 The silane coupling agent is ultrasonically hydrolyzed in an ethanol solution with a volume concentration of 95% at a pH of 4.2 for 30 minutes to obtain a hydrolyzate of the silane coupling agent; then add nano-TiO 2 Powder, mixed evenly, reacted at 100°C for 30 minutes, dried, and dispersed to obtain modified nano-TiO 2 powder; wherein the amount of silane coupling agent is coupling agent and nano-TiO 2 15% of the total mass, nano-TiO 2 The amount of coupling agent and nano-TiO 2 85% of the total mass;

[0048] The preparation method of the above-mentioned flexible anti-pollution ceramic membrane:

[0049] (1) At 140 °C, the coupling...

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Abstract

The invention discloses a flexible anti-pollution ceramic membrane, which is prepared through a blending-compression molding method from 39%-55% of coupling agent-modified inorganic nanometer material, 40%-52% of elastomer material, 3%-8% of pore-forming agent and 2%-7% of cross-linking agent. By adding a hydrophilic elastic material into an inorganic raw material, the softening of ceramic membrane is achieved, the hydrophilic performance is greatly strengthened, and thus mechanical strength and anti-pollution performance of the membrane are improved. The process for preparing the flexible anti-pollution ceramic membrane is simple and easy to control, no high-temperature sintering is required, and the preparation cost is greatly reduced.

Description

technical field [0001] The invention belongs to the technical field of membrane separation, and in particular relates to a flexible anti-pollution ceramic membrane and a preparation method thereof. Background technique [0002] Ceramic membrane separation technology is one of the most advanced membrane separation technologies in the world in recent years. Ceramic membrane is a kind of solid membrane, mainly made of Al 2 o 3 , ZrO 2 、TiO 2 composed of inorganic materials. The ceramic membrane is a product formed by uniform mixing of inorganic raw materials and additives, followed by high-temperature calcination. It contains a large number of pores inside, and the pores are interconnected. The porosity is greater than 30%, and the average pore size is generally 1-10 μm. In view of its good chemical stability, acid resistance, alkali resistance, strong oxidant resistance and organic solvent resistance, good anti-microbial erosion ability and biochemical compatibility, narr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D67/00B01D69/02B01D71/02B01D71/24B01D71/40
CPCB01D67/0079B01D69/02B01D71/024B01D71/025B01D71/027B01D71/24B01D71/40B01D2325/36
Inventor 瞿广飞高海均解若松杜彩东何康宁平
Owner KUNMING UNIV OF SCI & TECH
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