Preparation method of high temperature resistant, acid and alkali resistant reinforced fluoroplastic alloy separation membrane
A technology of acid and alkali resistance and separation membrane, which is applied in the direction of semi-permeable membrane separation, chemical instruments and methods, membranes, etc., to achieve unique separation functions, change high temperature resistance, and solve the effect of brittleness and blackening
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Embodiment 1
[0027] The invention provides a method for preparing a high-temperature-resistant acid-alkali-resistant enhanced fluoroplastic alloy separation membrane, which comprises the following steps:
[0028] Mix polyvinylidene fluoride powder and polyperfluoroethylene propylene powder in a certain proportion to form a mixture, wherein polyvinylidene fluoride accounts for 50%-90% of the total weight of the mixture, and polyperfluoroethylene propylene accounts for 10%- 50%;
[0029] Stirring and mixing the mixture with toughening agent, solvent and porogen in a certain proportion at high temperature to form a film-forming liquid, wherein the mixture accounts for 15-25% of the total weight of the film-forming liquid, and the toughening agent accounts for 1%-5% of the total weight of the membrane liquid, the porogen accounts for 10-15% of the total weight of the membrane-forming liquid, and the rest is solvent;
[0030] The membrane-making solution is spun by a phase inversion process to...
Embodiment 2
[0035] The present invention also provides a method for preparing a high-temperature-resistant acid-alkali-resistant enhanced fluoroplastic alloy separation membrane, comprising the following steps:
[0036] Mix polyvinylidene fluoride powder and polyperfluoroethylene propylene powder in a certain proportion to form a mixture;
[0037] Stirring and mixing the mixture with toughening agent, solvent and porogen in a certain proportion at high temperature to form a film-forming liquid;
[0038] The membrane-making solution is spun by a phase inversion process to produce a high-temperature-resistant, acid-alkali-resistant, and enhanced separation membrane.
[0039] Preferably, the film-forming liquid is squeezed into the spinneret by a metering pump, and the core liquid is quantitatively sent to the inner needle of the spinneret by a metering pump; spinning through the spinneret, cooling and solidifying in a coagulation bath to obtain a separation membrane.
[0040] Preferably, t...
Embodiment 3
[0065] (1) Raw materials
[0066] Polyvinylidene fluoride (F2), polyperfluoroethylene propylene (F46), grafted maleic anhydride, T80, solvent N,N'-dimethylacetamide (DMAc), porogen (polyvinyl alcohol or polyethylene diol), and the core fluid is a mixture of DMAc and water in a weight ratio of 5:5.
[0067] (2) Preparation of fluoroplastic alloy separation membrane
[0068] Mix 1.4kg of F2 solid powder and 0.6KG of F46 solid powder in a solid mixer, and gradually add them into a 5.3kg DMAc solvent feed tank, and the solvent temperature is 85°C. Add 0.1kg grafted maleic anhydride and 0.1kg emulsifier T80 to this feed liquid simultaneously. Stir while adding to make it dissolve evenly. After stirring for 2 hours, add 1.5 kg of porogen and the remaining 1 kg of solvent DMAc to the mixed solution, and continue stirring for 4-6 hours until the solution is uniform, and then stop stirring to obtain a film-forming solution. Stand still for defoaming while vacuuming. After degassin...
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Abstract
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