Conductive polymer dispersion and high-voltage solid-state capacitor conductive polymer emulsion

A conductive polymerization and dispersion technology, which is applied in the field of solid electrolytic capacitor preparation, can solve the problems of low temperature performance, low solid content, low viscosity, etc., and improve various performance indicators, reduce capacitor leakage, and improve withstand voltage. Effect

Active Publication Date: 2017-10-10
YANGZHOU SHENGYANG ELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Conventional emulsions are often composed of hydrophobic polymers wrapped by hydrophilic groups to form granular emulsions. The hydrophilic groups are wrapped outside the emulsion to stabilize the emulsion and do not stretch in a free state in water. Therefore the viscosity is lower
[0004] However, the conductive polymer dispersion generally has the disadv...

Method used

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  • Conductive polymer dispersion and high-voltage solid-state capacitor conductive polymer emulsion
  • Conductive polymer dispersion and high-voltage solid-state capacitor conductive polymer emulsion
  • Conductive polymer dispersion and high-voltage solid-state capacitor conductive polymer emulsion

Examples

Experimental program
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Effect test

Embodiment 1

[0026] Preparation of polystyrene sulfonic acid coated polyacrylate emulsion:

[0027] Add 2,000 grams of a 10% aqueous solution of sodium polystyrene sulfonate into a three-necked flask replaced with nitrogen, raise the temperature to 80°C, add 40 grams of methyl methacrylate, 10 grams of acrylamide, and 0.2 grams of emulsifier JS-20 , to form an emulsion, add 0.3 grams of ammonium persulfate, react for 4 hours, wait for it to cool to room temperature, add 50 ml of cation exchange resin, stir for 1 hour, filter and remove the exchange resin, and obtain polystyrene sulfonic acid-coated polyacrylate The emulsion is 2000mL, the measured solid content is 10%, and the particle size of the emulsion is 0.2um.

[0028] Preparation of conductive polymer dispersion with acrylate emulsion as the core:

[0029] Add 1000 grams of polyacrylic acid emulsion with a solid content of 10% to a three-necked flask replaced with nitrogen, then add 20 grams of EDOT monomer, stir and disperse to fo...

Embodiment 2

[0033] Preparation of polystyrene sulfonic acid coated polyacrylate emulsion:

[0034] Add 2,000 grams of a 10% aqueous solution of sodium polystyrene sulfonate into a three-necked flask replaced with nitrogen, raise the temperature to 80°C, add 15 grams of methyl methacrylate, 8 grams of acrylamide, and the compound emulsifier sodium ricinoleate Add 0.3 grams to form an emulsion, add 0.2 grams of ammonium persulfate, react for 4 hours, wait for it to cool to room temperature, add 50 ml of quaternary ammonium salt cation exchange resin, stir for 1 hour, filter and remove the exchange resin, and obtain polystyrene sulfonic acid The coated polyacrylate emulsion is 2000mL, the measured solid content is 8%, and the particle size of the emulsion is 0.2um.

[0035] Preparation of conductive polymer dispersion with acrylate emulsion as the core:

[0036] Add 1000 grams of polyacrylic acid emulsion with a solid content of 8% into a three-necked flask replaced with nitrogen, then add ...

Embodiment 3

[0040] Preparation of polystyrene sulfonic acid coated polyacrylate emulsion:

[0041]Add 2,000 grams of a 10% aqueous solution of sodium polystyrene sulfonate into a three-necked flask replaced with nitrogen, raise the temperature to 80°C, add 65 grams of methyl methacrylate, 12 grams of acrylamide, and the compound emulsifier sodium ricinoleate Add 0.5 grams to form an emulsion, add 0.2 grams of ammonium persulfate, react for 4 hours, wait for it to cool to room temperature, add 50 ml of quaternary ammonium salt cation exchange resin, stir for 1 hour, filter and remove the exchange resin, and obtain polystyrene sulfonic acid The coated polyacrylate emulsion is 2000mL, the measured solid content is 11%, and the particle size of the emulsion is 0.2um.

[0042] Preparation of conductive polymer dispersion with acrylate emulsion as the core:

[0043] Add 1,000 grams of polyacrylic acid emulsion with a solid content of 11% into a three-necked flask replaced with nitrogen, then a...

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Abstract

The invention provides conductive polymer dispersion and high-voltage solid-state capacitor conductive polymer emulsion. The preparation method comprises the following steps: adding acrylate, acrylamide and an emulsifier into an aqueous solution of sodium polystyrenesulfonate, and by taking ammonium persulfate as an initiator, performing emulsion polymerization; adding an EDOT (Ethylenedioxy Thiophene) monomer into the polymerized emulsion, and by taking ferric sulfate as a catalyst, dripping sodium persulfate serving as an oxidizing agent so as to obtain a mixed solution; removing the residual unreacted organic monomer in the mixed solution and inorganic salt components in the liquid; and adding polyglycerol, a wetting agent and a conductive reinforcing agent into the solution, and homogenizing under high voltage. The invention further comprises application of the dispersion obtained by the method to preparation of a solid electrolytic capacitor. Aqueous dispersion of a conductive polymer is synthesized, the impurities are purified and removed, the dispersion is impregnated and dried to serve as electrolyte of the capacitor, no impurity harmful to an oxidation film exists in the impregnation solution, capacitor leakage is reduced, and the withstand voltage of the product is increased.

Description

technical field [0001] The invention belongs to the technical field of preparation of solid electrolytic capacitors, in particular to a high-solid conductive polymer dispersion in solid electrolytic capacitors. Background technique [0002] Conductive polymer solid capacitors have excellent high-frequency and low-resistance characteristics, and are widely used in various applications. With the reduction of costs, there is a tendency to gradually replace the original liquid electrolytic capacitors. However, under its superior impedance characteristics and life characteristics, solid capacitors also have obvious disadvantages compared with traditional liquid electrolytic capacitors. Since solid capacitors are prepared by in-situ polymerization of monomers and oxidants in capacitor core packs, strong acid p-toluenesulfonate is used Ferric acid, as an oxidant and dopant, has a destructive effect on the oxide film of the anode foil, resulting in a large leakage current. Usually t...

Claims

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Application Information

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IPC IPC(8): C08F265/04C08F236/14C08F220/14C08F220/56C08L51/00C08L71/08
CPCC08F220/14C08F265/04C08L51/003C08L2201/52C08F220/56C08F236/14C08L71/00Y02E60/13
Inventor 徐永进冯哲圣黎华章
Owner YANGZHOU SHENGYANG ELECTRONICS
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