Preparation method of hollow flat ceramic membrane
A ceramic membrane and plate technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of poor fluidity of ceramic mud, high extrusion pressure and high energy consumption
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[0022] The application provides a method for preparing a hollow flat ceramic membrane, comprising the following steps:
[0023] X, preparation of film-casting slurry: ceramic powder, binder polymer A and dispersant polymer B are added to an organic solvent to prepare a uniformly dispersed ceramic powder / polymer / organic solvent system film-casting slurry; Y, Prepare the multi-channel hollow flat ceramic membrane body: add the casting slurry obtained in step X into the slurry tank, extrude the casting slurry in the slurry tank from the extrusion die by pressurizing, and form the casting slurry Be a multi-channel embryo body and enter the coagulation bath, and then undergo phase transformation to obtain a multi-channel hollow flat ceramic membrane embryo body; Z, sinter the multi-channel hollow flat ceramic membrane: the multi-channel hollow flat ceramic membrane embryo body obtained in step Y from After being taken out of the coagulation bath, it is placed on a flat plate to be ...
Embodiment 1
[0032] (a) Calculate and weigh a certain amount of polysulfone and polyvinylpyrrolidone with a molecular weight of about 150,000 Daltons and add them to a conical flask filled with 500 milliliters of N-N dimethylacetamide, wherein the amount of polysulfone added is 8%. , the addition amount of polyvinylpyrrolidone is 0.6%, the addition amount of N-N dimethylacetamide is 48.4%, and then electric stirring is performed at 60°C for 5 hours to completely dissolve the polymer;
[0033] (b) Calculate and weigh a certain amount of Al with an average particle diameter of 2 microns 2 o 3 Particles are added to the solution obtained in step (a), wherein Al 2 o 3 The addition amount is 43%, then use ball mill to grind for 24 hours, and finally defoam under vacuum condition for 3 hours to obtain evenly dispersed Al 2 o 3 / polysulfone / organic solvent system casting slurry;
[0034] (c) if figure 1 , figure 2 and image 3 As shown, the extrusion die is assembled, the lower part of t...
Embodiment 2
[0041] (a1) Calculate and weigh a certain amount of cellulose acetate and polyethylene glycol with a molecular weight of about 50,000 Daltons and add in the triangular flask where 500 milliliters of N-methylpyrrolidone is housed, wherein the amount of cellulose acetate added is 10%, the addition of polyethylene glycol is 0.5%, the addition of N-methylpyrrolidone is 45.5%, and then electric stirring is performed at 50°C for 4 hours to completely dissolve the polymer;
[0042] (b1) Calculate and weigh a certain amount of Al with an average particle diameter of 5 microns 2 o 3 Particles and TiO with an average particle size of 100 nm 2 Add the solution obtained in (a1), wherein Al 2 o 3 The addition amount is 40%, TiO 2 The addition amount is 4%, then use ball mill to grind for 24 hours, and finally defoam under vacuum condition for 4 hours to obtain evenly dispersed Al 2 o 3 / TiO 2 / cellulose acetate / organic solvent system casting film slurry;
[0043] (c1) if figure 1 ...
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