Water-soluble polymer for negative sheet, preparation method and negative sheet
A water-soluble polymer and polymer technology, applied in battery electrodes, non-aqueous electrolyte battery electrodes, structural parts, etc., can solve the problems of increased battery internal resistance, insufficient, uneven electrolyte infiltration, etc., to improve performance , Improve the effect of liquid retention
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[0040] In a second aspect, the embodiments of the present invention disclose a method for preparing the water-soluble polymer, including:
[0041] In molar parts, 5-15 parts of styrene-acrylic copolymer-b-PEO-b-styrene-acrylic copolymer block copolymer and 0.1-5 parts of crosslinking agent are added to the first solvent and mixed, at 80- React at 120°C for 10-20 hours to obtain a cross-linked product;
[0042] Mix 5-15 parts of the cross-linked product, 100-150 parts of dichloromethane, and 2-15 parts of trifluoroacetic acid, and react at room temperature for 6-10 hours to obtain a water-soluble polymer.
[0043] Wherein, the crosslinking agent includes one or more of hydroxyethyl acrylate, divinylbenzene, allylamine, and 1,4-p-chloromethylstyrene; the first solvent includes toluene, xylene, One or more of tetrahydrofuran, chloroform, and dimethyl sulfoxide. In the above reaction, the cross-linking agent can cross-link the long molecular chains in the styrene-acrylic copolym...
Embodiment 1
[0065] (1) In terms of molar parts, add 3 parts of PEO and 100ml of toluene to the reactor, remove the moisture in the PEO by azeotropic distillation, then cool the solution to 0°C, add 2 parts of triethylamine into the reactor, add 2 parts of 2-bromoisobutyryl bromide, then reacted at room temperature for 24 hours, after the reaction, filtered to remove triethylamine hydrobromide, then precipitated the product in poor solvent methanol, filtered, and vacuum dried to obtain molecular chain bromine capped PEO;
[0066] (2) In terms of molar parts, add 3 parts of the above-mentioned bromine-terminated PEO, 1 part of ligand 2,2'-bipyridyl, 1 part of catalyst cuprous bromide, 1 part of monomer styrene, 1 part of solid tert-propyl acrylate, then add solvent toluene, freeze-thaw cycle to remove oxygen and water, blow nitrogen, react at 70°C for 12h, after the reaction, dissolve the obtained product in benign solvent THF, and then pass through Al2O3 column, then carry out vacuum dryi...
Embodiment 2
[0071] (1) In terms of molar parts, add 3 parts of PEO and 100ml of toluene to the reactor, remove the moisture in the PEO by azeotropic distillation, then cool the solution to 0°C, add 0.5 parts of triethylamine to the reactor, add 0.5 part of 2-bromoisobutyryl bromide, and then react at room temperature for 24 hours. After the reaction, remove triethylamine hydrobromide by filtration, then precipitate the product in poor solvent methanol, filter, and dry in vacuum to obtain molecular chain bromine capped PEO;
[0072] (2) In terms of molar parts, add 3 parts of the above-mentioned bromine-terminated PEO, 4 parts of the ligand 2,2'-bipyridine, 1 part of the catalyst cuprous bromide, and 5 parts of the monomer styrene into the reactor. 5 parts of solid tert-propyl acrylate, then add solvent toluene, freeze-thaw cycle to remove oxygen and water, blow nitrogen, react at 90°C for 12h, after the reaction, dissolve the obtained product in tetrahydrofuran, a benign solvent, and Al2...
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