A kind of water-dispersible polymer microparticle emulsion binder and its preparation method

A polymer and microparticle technology, applied in the direction of hydrocarbon copolymer adhesives, adhesives, structural parts, etc., can solve the problems of low adhesion, peeling off, unstable performance, etc., and achieve the effect of strong adhesion

Active Publication Date: 2019-06-07
NANJING TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In view of the low cohesive force of the above-mentioned existing PVDF resin binder, the performance of the polyurethane polymer binder is unstable in the electrolyte, and it is easy to expand or dissolve slowly; Disadvantages such as peeling off on the chip, after repeated research and demonstration, the present invention provides a water-dispersed polymer microparticle emulsion binder and its preparation method, which solves the above-mentioned application problems

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] Seed polymer microparticle emulsion preparation:

[0052] Add 60 g of deionized water, 5.6 g of 50% sodium dodecyl diphenyl ether disulfonate, 38.5 g of styrene, and 59.5 g of isooctyl acrylate into a pressure-resistant emulsification container equipped with a stirring paddle and a nitrogen inlet valve. g, 1.5 g of methacrylic acid, and 0.5 g of vinyl methacrylate, stirred to obtain a monomer mixture emulsion. Then add deionized water 110g in the pressure-resistant reactor that stirring paddle, thermometer, nitrogen inlet valve and reflux condenser are housed, add 50% sodium dodecyl diphenyl ether disulfonate 1.0g while stirring, Then heat up to 70° C., then add 12 g of 5% ammonium persulfate aqueous solution into the reaction kettle, and at the same time, start to continuously drop the above-mentioned monomer mixture emulsion, and the dropping time is 420 minutes. After the addition is completed, add 6 g of 5% ammonium persulfate aqueous solution, raise the polymeriza...

Embodiment 2

[0058] Seed polymer microparticle emulsion preparation:

[0059] Add 200 g of deionized water into the pressure-resistant reactor equipped with stirring paddle, thermometer, nitrogen inlet valve and reflux condenser, add 12.3 g of 30% sodium dodecylbenzenesulfonate and 44.7 g of styrene while stirring, Acrylic acid 1.5g, tert-dodecyl mercaptan 0.3g, exchanged with nitrogen to remove oxygen, finally inhaled 1,3-butadiene 53.8g, then heated to 60 ° C, then added 5.0% super Ammonium sulfate aqueous solution 8.0g. When the reaction conversion rate reaches more than 95.0%, the seed polymer microparticle emulsion with a solid content of 32.0%, a particle diameter of 76nm, a glass transition temperature of -23.2°C and a gel content of 81% can be obtained.

[0060] Binder Microparticle Emulsion Preparation:

[0061] Add 60g of deionized exchange water, 3.0g of 30% sodium dodecylbenzenesulfonate, 50.5g of styrene, 3.0g of acrylonitrile, 0.3 g of alkyl mercaptan, 1.2 g of methacrylic...

Embodiment 3

[0065] Seed polymer microparticle emulsion preparation:

[0066] Add 200 g of deionized water into the pressure-resistant reactor equipped with stirring paddle, thermometer, nitrogen inlet valve and reflux condenser, add 12.3 g of 30% sodium dodecylbenzenesulfonate and 44.7 g of styrene while stirring, Acrylic acid 1.5g, tert-dodecyl mercaptan 0.3g, exchanged with nitrogen to remove oxygen, finally inhaled 1,3-butadiene 53.8g, then heated to 60 ° C, then added 5.0% super Ammonium sulfate aqueous solution 8.0g. When the reaction conversion rate reaches more than 95.0%, the seed polymer microparticle emulsion with a solid content of 32.0%, a particle diameter of 76nm, a glass transition temperature of -23.2°C and a gel content of 81% can be obtained.

[0067] Binder Microparticle Emulsion Preparation:

[0068] Then add deionized exchange water 110g in the pressure-resistant reactor that stirring paddle, thermometer, nitrogen inlet valve and reflux condenser are housed, add 31....

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Abstract

The invention relates to a water-dispersed polymer microparticle emulsion binder and a preparation method thereof. The binder is a water-dispersed polymer microparticle emulsion, specifically a polymer microparticle with an inner and outer double-layer structure, and the inner layer is glass Carboxyl-containing seed polymer microparticles with a transition temperature of -85-50°C, a particle size of 30-120nm, and a gel content of 10-95%, the outer layer of which has a glass transition temperature of -20-50°C. Contains polymers obtained by copolymerization of conjugated dienes and aromatic vinyls. The particle size of the polymer microparticle emulsion is 50-300nm, and the gel content is 20-90%. The binder can be used to make the negative pole of the lithium ion secondary battery, and is used for binding electrode active materials, conductive agents and current collectors.

Description

technical field [0001] The invention relates to a composition of a binder and a method for preparing the binder. The binder is a water-dispersed polymer microparticle emulsion binder, and its dispersion is a polymer microparticle with an inner and outer double-layer structure. The binder can be used to make the negative pole of the lithium ion secondary battery, and is used for binding electrode active materials, conductive agents and current collectors. Background technique [0002] A lithium-ion secondary battery generally consists of a positive electrode, a negative electrode, a separator, and an electrolyte. The negative electrode is composed of active material, conductive agent, binder, and current collector. Usually, the active material, conductive agent, and binder are mixed into a liquid slurry, coated on the current collector, dried and rolled to make lithium Negative terminal of ion battery. The negative electrode active material is graphite, or carbon with a sim...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J125/14C09J147/00C08F212/08C08F236/10C08F220/18C08F220/06C08F220/42C08F222/06C08F220/44H01M4/62H01M10/0525
CPCH01M4/622H01M10/0525C09J125/14C09J147/00C08F212/08C08F236/10C08F236/06C08F220/06C08F220/44C08F220/56C08F220/18C08F222/06C08F220/1802C08F220/1808C08F220/40C08F220/42Y02E60/10
Inventor 刘祥
Owner NANJING TECH UNIV
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