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Preparation method of tubular membranes used for water treatment
The invention relates to the field of membranes for water treatment and in particular relates to a preparation method of tubular membranes used for water treatment. The preparation method comprises the following steps: by using alumina powder as an aggregate, adding silicon carbide whiskers, a pore-forming agent, a sintering aid and water, mixing the materials to form slurry, then grinding the slurry, then aging and drying the slurry, then adding a plasticizer and water and regrinding the mixture, carrying out compression molding by adopting a pipe mold and drying, sintering and washing the product, thus obtaining a tubular support; adding ground aluminium isopropoxide to hot deionized water, carrying out magnetic stirring, then adding nitric acid, a dispersing agent and a defoaming agent by stages, stirring the materials uniformly to obtain sol and then aging the sol; then sealing the outer surface of the support and carrying out coating, gelation, drying and sintering. The method has the beneficial effects that more stable sol can be prepared by controlling the hydrolysis temperature and the amount of deionized water; meanwhile, adding proper amount of dispersing agent and defoaming agent to the sol is conducive to improving the wettability of the sol and the surface of the support, improving the quality of the formed membranes and avoiding cracks.
Preparation method of tubular membranes used for water treatment
The invention relates to the field of membranes for water treatment and in particular relates to a preparation method of tubular membranes used for water treatment. The preparation method comprises the following steps: by using alumina powder as an aggregate, adding silicon carbide whiskers, a pore-forming agent, a sintering aid and water, mixing the materials to form slurry, then grinding the slurry, then aging and drying the slurry, then adding a plasticizer and water and regrinding the mixture, carrying out compression molding by adopting a pipe mold and drying, sintering and washing the product, thus obtaining a tubular support; adding ground aluminium isopropoxide to hot deionized water, carrying out magnetic stirring, then adding nitric acid, a dispersing agent and a defoaming agent by stages, stirring the materials uniformly to obtain sol and then aging the sol; then sealing the outer surface of the support and carrying out coating, gelation, drying and sintering. The method has the beneficial effects that more stable sol can be prepared by controlling the hydrolysis temperature and the amount of deionized water; meanwhile, adding proper amount of dispersing agent and defoaming agent to the sol is conducive to improving the wettability of the sol and the surface of the support, improving the quality of the formed membranes and avoiding cracks.
Preparation method of tubular membranes used for water treatment
YI JIANRONG (author) / LIN LILI (author) / TANG ZHEN (author) / WU JIAN (author)
2015-07-15
Patent
Electronic Resource
English
IPC:
C04B
Kalk
,
LIME
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