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Soap-free emulsion polymerization method of polyvinylidene fluoride for lithium battery electrode binding agent

A technology of soap-free emulsion polymerization and polyvinylidene fluoride, which is applied in the field of polymers, can solve the problems of affecting the electrical properties of polymers, increasing process complexity, and increasing costs, and achieves high stability, low manufacturing cost, and high adhesion sexual effect

Active Publication Date: 2014-04-30
SHANDONG HUAXIA SHENZHOU NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although most of the additives can be removed by washing and other processes, it is difficult to completely remove them
Containing unremoved additives will affect the electrical properties of the polymer, and the addition and removal of additives will also increase its cost and increase the complexity of the process

Method used

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  • Soap-free emulsion polymerization method of polyvinylidene fluoride for lithium battery electrode binding agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Example 1: Add 6.5 kg of ion-free water, 0.5 kg of fluorocarbon solvent, and 50 g of ammonium hydrogen phosphate solution with a mass concentration of 10% into a cleaned 10L polymerization kettle as a pH buffer; evacuate and remove oxygen until the oxygen content is ≤ 20ppm It is qualified; prepare a total of 100g of ammonium persulfate aqueous solution (initiator) with a mass concentration of 2.0%, and 200g of ethyl acetate solution with a mass concentration of 3.0% (regulator), and set aside. The monomer vinylidene fluoride in the storage tank is 5kg. Then raise the temperature of the polymerization kettle, and at the same time, increase the pressure by filling the polymerization kettle with vinylidene fluoride monomer. When the temperature of the polymerization kettle reaches 85°C and the pressure of the kettle reaches 2.0MPa, quickly inject 30g of 2.0% vinylidene fluoride into the polymerization kettle with a metering pump. Aqueous solution of ammonium persulfate, s...

Embodiment 2

[0031]Example 2: Taking a 10L polymerization kettle as an example, add 6.5kg of ion-free water, 0.5kg of fluorocarbon solvent, and 50g of pH buffering agent to a 10% ammonium hydrogen phosphate solution in the cleaned polymerization kettle; Content ≤ 20ppm is qualified; prepare a total of 80g of ammonium persulfate aqueous solution (initiator) with a mass concentration of 2.5%, and 200g of ethyl acetate solution with a mass concentration of 3.0% (regulator) for later use. Then raise the temperature of the polymerization kettle, and increase the pressure by filling the polymerization kettle with vinylidene fluoride monomer at the same time. When the temperature of the polymerization kettle reaches 85°C and the pressure of the kettle reaches 2.0MPa, quickly inject 24g of 2.5% superfluidic acid into the polymerization kettle with a metering pump. Ammonium sulfate aqueous solution, start polyreaction, after 15 minutes, squeeze remaining 56g concentration with metering pump at a con...

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PUM

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Abstract

The invention relates to a soap-free emulsion polymerization method of polyvinylidene fluoride for a lithium battery electrode binding agent. The polymerization method takes a fluorocarbon solvent as a cosolvent, takes water as a dispersion medium, takes inorganic persulfate as an inhibitor and takes an ester as an adjusting agent; a polymerization reaction is carried out at the temperature of 84-86 DEG C and the pressure of 2.0-2.2MPa; the inhibitor and the adjusting agent are continuously added. The method has a moderate polymerization condition; a polymerized product does not contain any emulsifying agent and less impurity content; the size of the molecular weight is moderate and the distribution coefficient is narrow; the product has good thermal chemical stability, moderate viscosity and good processability.

Description

technical field [0001] The invention relates to a polyvinylidene fluoride polymerization method, in particular to a soap-free emulsion polymerization method of polyvinylidene fluoride used as a lithium battery electrode binder, and belongs to the technical field of polymers. Background technique [0002] Polyvinylidene fluoride (PVDF) refers to the homopolymer or copolymer of vinylidene fluoride monomer. The repeating unit of the PVDF molecular chain is -CH 2 -CF 2 - The alternate arrangement of groups, this special molecular structure determines that PVDF fluororesin has the characteristics of both fluorine-containing resin and general-purpose resin, and has excellent chemical resistance, high temperature resistance, oxidation resistance and high dielectric constant. In addition, thermoplastic PVDF has excellent mechanical properties and processing properties compared with perfluororesins, so PVDF is widely used in lithium battery binders. [0003] In Li-ion batteries, P...

Claims

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Application Information

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IPC IPC(8): C08F114/22C08F2/22C08F2/38C08F4/30H01M4/62
CPCY02E60/10
Inventor 李秀芬王汉利王军唐妮
Owner SHANDONG HUAXIA SHENZHOU NEW MATERIAL
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