A kind of vinylidene fluoride polymer used for lithium ion power battery binder and its preparation method and application
A technology for vinylidene fluoride and power batteries, which is applied in battery electrodes, secondary batteries, circuits, etc. It can solve the problems of unmentioned adhesive properties and low molecular weight of copolymers, so as to maintain adhesive properties, reduce dosage, and have broad development prospects Effect
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Embodiment 1
[0041] Add 12Kg deionized water, 12g hydroxypropyl methylcellulose, and purging nitrogen to deoxygenate the pressure test in the 20L high-pressure reactor A, so that the oxygen content in the kettle is lower than 10ppm; add 3.5Kg vinylidene fluoride from the initial tank, Start stirring at a speed of 200r / min, heat up to 70°C, add 2.52g of diisopropyl peroxydicarbonate with a metering pump, and start the reaction with 22.4g of diethyl carbonate; add vinylidene fluoride monomer with a membrane pump to make The reaction pressure was maintained at 11.5 MPa, and 7.8 g of diethyl carbonate was added every 60 minutes, and 1.32 g of diisopropyl peroxydicarbonate was added every 45 minutes, and the reaction ended after 2.8 hours. The polymer slurry is devolatilized in a degassing tank, and the unreacted monomer is recovered; the polymer slurry is washed with deionized water until the conductivity of the washing solution drops below 1 μs / cm, and then the 35% concentration of the slurry ...
Embodiment 2
[0045] Add 12Kg of deionized water, 4g of methylcellulose, 9g of hydroxypropylmethylcellulose into the 20L autoclave A, and test the pressure by purging nitrogen to remove oxygen, so that the oxygen content in the kettle is lower than 10ppm; 3.5Kg vinylidene fluoride, start stirring, the speed is 300r / min, heat up to 65°C, add 3.3g di-n-propyl peroxydicarbonate with a metering pump, 19.4g acetone starts to react; use a membrane pump to add vinylidene fluoride The monomer keeps the reaction pressure at 12 MPa, and 6.4 g of acetone is added every 60 minutes, and 2.1 g of di-n-propyl peroxydicarbonate is added every 45 minutes, and the reaction ends after 2.7 hours. The polymer slurry is devolatilized in a degassing tank, and the unreacted monomer is recovered; the polymer slurry is washed with deionized water until the conductivity of the washing solution drops below 1 μs / cm, and then the 35% concentration of the slurry is mixed at 105 ℃ spray drying to obtain the finished produ...
Embodiment 3
[0049] Add 12Kg deionized water, 21g hydroxypropyl methylcellulose, and purging nitrogen to deoxygenate the pressure test in the 20L high-pressure reactor A, so that the oxygen content in the kettle is lower than 10ppm; add 3.5Kg vinylidene fluoride from the initial tank, Start stirring at a speed of 188r / min, heat up to 78°C, add 5.5g of diethyl peroxydicarbonate and 30.2g of diethyl malonate to start the reaction with a metering pump; add vinylidene fluoride monomer with a membrane pump Keep the reaction pressure at 11.6 MPa, add 4.7 g of diethyl malonate every 60 minutes, and add 2.2 g of diethyl peroxydicarbonate every 45 minutes, and the reaction ends after 3.7 hours. The polymer slurry is devolatilized in a degassing tank, and the unreacted monomer is recovered; the polymer slurry is washed with deionized water until the conductivity of the washing solution drops below 1 μs / cm, and then the 35% concentration of the slurry is mixed at 105 ℃ spray drying to obtain the fini...
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