Polyvinylidene difluoride membrane, manufacturing method thereof, and purifying brine method thereof
A technology of polyvinylidene fluoride and thin film, which is applied in the direction of chemical instruments and methods, membrane, membrane technology, etc., can solve the problems of reducing the life of DCMD and affecting the stability of DCMD, and achieves low cost, good salt resistance and simple manufacturing process Effect
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[0036] Preparation Example 1
[0037] Take triethyl phosphate (TEP, triethyl phosphate, Alfa Aesar) and polyvinylidene fluoride (PVDF, with a melt viscosity of 35 to 60 kpoise) to prepare a 6-10wt% PVDF polymer solution, stir it with a magnet at 30 Dissolve at -80°C until PVDF is completely dispersed. After the PVDF is completely dissolved, control the internal temperature to keep stirring the solution at the set temperature for more than 48 hours, then let it stand for more than 24 hours or use a reduced pressure vacuum to remove bubbles in the dope solution.
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[0038] Preparation example 2 (modification of carbon nanotubes)
[0039] Disperse 10 grams of carbon nanotubes in 100 grams of 30-50wt% hydrogen peroxide and stir and react at 50-105°C for 3-6 hours to cause oxidation reaction on the surface of the carbon nanotubes, and filter the reacted carbon nanotubes. After being washed with deionized water to neutrality, it is placed in an oven and dried at a low temperature of 50-80° C. to obtain oxidized modified carbon nanotubes. Preparation example 3 (modification of carbon nanotubes)
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Example 3
[0040] Disperse 10 grams of carbon nanotubes in 100 grams of 3-5M nitric acid, stir and react at 50-105°C for 3-6 hours to oxidize the surface of the carbon nanotubes, and filter the reacted carbon nanotubes. After the ionized water is cleaned to neutrality, it is placed in an oven and dried at a low temperature of 50-80° C. to obtain oxidized modified carbon nanotubes.
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