Preparation method of water-based binder for negative electrode sheet
A technology of water-based binder and negative pole piece, which is applied in the field of preparation of lithium ion battery materials, can solve the problems of long production time and low production efficiency of pole piece, and achieve the effect of short dispersion time, low cost and shortened time.
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[0053] The preparation method of negative pole sheet water-based binder of the present invention may further comprise the steps:
[0054] 1. Under the working temperature (10-30°C), according to the mass percentage, dissolve 0.25-6.0% of the reactive surfactant in deionized water with a mass of 100-150%, and then add 30.0-65.0% of the hydrophobic monomer, Hydrophilic monomer 10.2-50.0%, functional monomer 0.3-6.0%, cross-linking agent 0.08-6.0%, chain transfer agent 0.08-0.8%, at a speed of 250-450rpm, mix for 20-60min, during which nitrogen gas is introduced N 2 , with a flow rate of 50-150ml / min, for deoxygenation protection, forming a pre-emulsion, heating the pre-emulsion to 60-90°C at a heating rate of 2-3°C / min, and keeping it warm for 30-60min.
[0055] This step is to dissolve and mix to form monomer droplets, and the monomer droplets peripherally gather reactive surfactants to form a stable monomer emulsion, which will not It will take the reactive surfactant from t...
Embodiment 1
[0072] One, under 20 ℃ of working temperature, with 1.0g (2.0%), the reaction type surfactant alcohol ether phosphate APE-2012 containing double bond of solid content 50Wt% is dissolved in 58g (116%) deionized water, successively Add hydrophobic monomer ethyl acrylate 28.8g (57.6%), hydrophilic monomer methacrylic acid 14.275g (28.55%), hydrophilic monomer acrylic acid 3g (6.0%), functional monomer laurate methacrylate 2g (4.0%), crosslinking agent N-N methylenebisacrylamide 0.052g (0.104%), chain transfer agent n-dodecyl mercaptan 0.048g (0.096%), the rotating speed is 300rpm, 30min blends uniformly, passes into during N2, with a flow rate of 100ml / min, for deoxygenation protection, forming a pre-emulsion, heating the pre-emulsion to 85°C at a heating rate of 3°C / min, and keeping it warm for 30min.
[0073] 2. Dissolve 0.7g (1.4%) of the reactive surfactant alcohol ether phosphate APE-2012 containing double bonds in 54.795g (109.59%) of deionized water, and add it to the reac...
Embodiment 2
[0085] One, under the working temperature of 20 ℃, 5.2g (5.2%), the reactive surfactant methacrylamide isopropyl sulfonic acid sodium salt A-2405NA of solid content 50Wt% is dissolved in 60g (120%) deionized In the water, add 27.223g (54.446%) of hydrophobic monomer ethyl acrylate, 17g (34%) of hydrophilic monomer methacrylic acid, 1.5g (3%) of functional monomer laurate methacrylate, and crosslinking agent Divinyl phthalate 0.056g (0.112%), chain transfer agent n-dodecyl mercaptan 0.096g (0.192%), rotating speed is 300rpm, 30min blends uniformly, feeds N during flow 100ml / min, carry out removal Oxygen protection to form a pre-emulsion, the temperature of the pre-emulsion was raised to 85°C at a heating rate of 3°C / min, and the temperature was kept for 30min.
[0086] 2. Dissolve 2.8g (2.8%) of the reactive surfactant methacrylamide isopropyl sulfonate sodium salt A-2405NA in 48g (96%) of deionized water and add it to the reaction kettle at a speed of 300rpm. N2 deoxygenation...
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