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Method for capping tubular ceramic membrane

A ceramic membrane and tubular technology, which is applied in the field of end capping of tubular ceramic membranes, can solve the problems that the resin cannot have both heat resistance, acid resistance and alkali resistance, increase the workload and cost, and improve the overall interception efficiency. Improved sealing effect

Active Publication Date: 2020-02-04
SANDA FILM SCI & TECH XIAMEN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, resin or resin coating is a commonly used end-capping material due to its good sealing performance, but the resin cannot have heat resistance, acid resistance and alkali resistance at the same time, even epoxy resin or silicone modified epoxy resin, at a certain temperature and Still fails too quickly during accelerated corrosion under pH conditions
Although special glass has excellent heat resistance, acid and alkali resistance and sealing performance, because the sintering melting temperature of the glass powder is often inconsistent with the sintering temperature of the film material, high temperature sintering is required, which greatly increases the workload and cost.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] (1) Add 40 parts by weight of nano-alumina powder with an average particle diameter of 400nm into 60 parts by weight of water, and cut at 8000rpm for 10min to make a nano-alumina dispersion;

[0023] (2) Add 60 parts by weight of nano-alumina dispersion to 40 parts by weight of Teflon dispersion (D-210C type PTFE, Daikin, Japan), cut at 8000rpm for 5min, then stir at 100rpm for 2h to obtain Teflon Dragon feed liquid;

[0024] (3) Put the end of the tubular ceramic membrane with an average pore diameter of 200nm and the particles of the membrane layer as alumina into the Teflon feed solution for 20s, take it out, and blow off the material stuck in the hole with a 0.02MPa low-pressure air gun. Placed horizontally, the temperature was raised to 380°C by a program of 3°C / min, the temperature was kept at a constant temperature for 2 hours, and then the temperature was naturally lowered, and a Teflon end-capping coating with an average pore size of 200nm was obtained at the e...

Embodiment 2

[0028] (1) 40 parts by weight of nano-titanium oxide powder with an average particle diameter of 80nm are added to 60 parts by weight of water, and sheared at 8000rpm for 15min to make a nano-titanium oxide dispersion;

[0029] (2) Add 60 parts by weight of nano-titanium oxide dispersion to 40 parts by weight of Teflon dispersion (D-210C type PTFE, Daikin, Japan), cut at 8000rpm for 10min, then stir at 100rpm for 3h to obtain iron Fluorocarbon liquid;

[0030] (3) Put the end of the tubular ceramic membrane with an average pore diameter of 40nm and the particles of the membrane layer as titanium oxide into the Teflon feed solution for 30s, take it out, and blow off the material stuck in the hole with a 0.02MPa low-pressure air gun Placed horizontally, the temperature was raised to 380°C by a program of 3°C / min, the temperature was kept at a constant temperature for 2 hours, and then the temperature was naturally lowered, and a Teflon end-capped coating with an average pore siz...

Embodiment 3

[0034] (1) 30 parts by weight of nano-titanium oxide powder with an average particle diameter of 50 nm are added to 70 parts by weight of water, and sheared at 8000 rpm for 20 min to make a nano-titanium oxide dispersion;

[0035] (2) Add 60 parts by weight of nano-titanium oxide dispersion to 40 parts by weight of Teflon dispersion (D-210C type PTFE, Daikin, Japan), cut at 8000rpm for 15min, then stir at 100rpm for 4h to obtain iron Fluorocarbon liquid;

[0036] (3) Put the end of the tubular ceramic membrane with an average pore diameter of 20nm and the particles of the membrane layer as titanium oxide into the Teflon feed solution for 40s, take it out, and blow off the material stuck in the hole with a 0.02MPa low-pressure air gun Placed horizontally, the temperature was raised to 380°C by a program of 3°C / min, the temperature was kept at a constant temperature for 2 hours, and then the temperature was naturally lowered, and a Teflon end-capped coating with an average pore ...

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Abstract

The invention discloses a method for capping a tubular ceramic membrane. The method comprises the following steps: adding a certain amount of membrane layer composition inorganic oxide powder into a Teflon dispersion liquid to fill holes in a Teflon coating layer, and adjusting the aperture size in the coating layer to be consistent with or smaller than the aperture size in a membrane layer, so that the sealing property of the coating layer is improved. According to the invention, firstly, the membrane layer composition inorganic oxide powder is dispersed in a Teflon solution; then the end part of a tubular ceramic membrane is coated with the Teflon solution by adopting a dip coating process; after baking and curing at low temperature, the Teflon coating layer with an average aperture sizeconsistent with the average aperture size of the membrane layer; and the membrane layer composition inorganic oxide powder is introduced into the Teflon coating layer, so that the sealing property ofthe coating layer is improved, interception efficiency of the end part is consistent with interception efficiency of the membrane layer, and overall interception efficiency of the tubular ceramic membrane is improved.

Description

technical field [0001] The invention belongs to the technical field of ceramic membrane preparation, and in particular relates to a method for capping a tubular ceramic membrane. Background technique [0002] Inorganic ceramic membrane has high temperature resistance, good chemical stability, acid resistance, alkali resistance, organic solvent resistance, high mechanical strength, reverse flushing, strong anti-microbial ability, narrow pore size distribution, large permeation, high membrane flux, and separation With the characteristics of high efficiency and long service life, it is widely used in chemical industry, metallurgy, food, medicine, environmental protection and other fields. The tubular ceramic membrane produced by the adsorption coating process is the mainstream product in the current market. [0003] The end of the tubular ceramic membrane, because the coating liquid cannot be completely absorbed during the coating process, and the wet film layer at the end is ...

Claims

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Application Information

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IPC IPC(8): B01D71/02B01D69/04B01D67/00
CPCB01D67/0039B01D69/04B01D71/02B01D71/024
Inventor 曾冬清洪昱斌方富林蓝伟光
Owner SANDA FILM SCI & TECH XIAMEN
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