A preparation method of fluorine-containing copolymer for water treatment membrane
A technology for water treatment membranes and copolymers, applied in the field of preparation of fluorine-containing copolymers, can solve the problems of poor chemical corrosion resistance and weather resistance, difficult to obtain structural copolymers, poor chemical stability, etc., so as to maintain chemical stability. and weather resistance, high product purity, good hydrophilic effect
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Embodiment 1
[0031] In a cleaned 5 L vertical autoclave, 2.6 L of deionized water containing a mixture of 5.2 g of methylcellulose and hydroxyethylcellulose (1:1) was added. Vacuumize and replace nitrogen 5 times until the oxygen content is lower than 30ppm. Add 5.0 g of acetone into the reaction kettle, adjust the stirring speed to 200 r / min, and maintain the temperature at 15°C. Vinylidene fluoride and hexafluoropropylene were added to the reaction kettle at a molar ratio of 90:5, and the temperature was raised to 40°C. When the pressure in the kettle reached 4.0MPa, 6.0g of diisopropyl peroxydicarbonate and 35 g of 2-trifluoromethacrylic acid in water. Subsequently, the temperature of the reactor was raised to 60° C. at a rate of 10° C. / h, and the stirring speed was increased to 600 r / min. During the polymerization process, the ratio of additional monomer vinylidene fluoride, hexafluoropropylene and 2-trifluoromethacrylic acid is 90:5:5, so that the reaction pressure is maintained at ...
Embodiment 2
[0042] In a cleaned 5 L vertical autoclave, 2.6 L of deionized water containing a mixture of 6.0 g of methylcellulose and hydroxyethylcellulose (1:1) was added. Vacuumize and replace nitrogen 5 times until the oxygen content is lower than 30ppm. Add 6.0 g of acetone into the reaction kettle, adjust the stirring speed to 200 r / min, and maintain the temperature at 20°C. Vinylidene fluoride and hexafluoropropylene were added to the reaction kettle at a molar ratio of 75:20, the temperature was raised to 40°C, and when the pressure in the kettle reached 4.0MPa, 6.0g of diisopropyl peroxydicarbonate and 35 g of 2-trifluoromethacrylic acid in water. Subsequently, the temperature of the reactor was raised to 70° C. at a rate of 15° C. / h, while the stirring speed was increased to 600 r / min. During the polymerization process, monomers with a ratio of vinylidene fluoride / hexafluoropropylene / 2-trifluoromethacrylic acid of 75:20:5 were added to maintain the reaction pressure at 4.8MPa. ...
Embodiment 3
[0044] In a cleaned 5L vertical autoclave, 2.6L of deionized water containing a mixture of 5.5g of methylcellulose and hydroxyethylcellulose (1:1) was added. Vacuumize and replace nitrogen 5 times until the oxygen content is lower than 30ppm. Add 5.5 g of acetone into the reactor, adjust the stirring speed to 200 r / min, and maintain the temperature at 15°C. Vinylidene fluoride and hexafluoropropylene were added to the reaction kettle at a molar ratio of 80:10, and the temperature was raised to 40°C. When the pressure in the kettle reached 4.0MPa, 6.0g of diisopropyl peroxydicarbonate and 70 g of 2-trifluoromethacrylic acid in water. Subsequently, the temperature of the reactor was raised to 70° C. at a rate of 15° C. / h, while the stirring speed was increased to 600 r / min. During the polymerization process, add monomers with a ratio of vinylidene fluoride / hexafluoropropylene / 2-trifluoromethacrylic acid of 80:10:10 to maintain the reaction pressure at 5.5 MPa, and finish the r...
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