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Polythiophene derivative aqueous dispersion and preparation method thereof

A technology of polythiophene derivatives, applied in the field of polythiophene derivative aqueous dispersions and their preparation, can solve the problems of limiting the application of polythiophene derivative aqueous dispersions, low conductivity, poor stability, etc., and achieve excellent Water dispersibility, avoid peroxidation problem, good stability effect

Inactive Publication Date: 2014-12-10
SHENZHEN CAPCHEM TECH
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  • Claims
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Problems solved by technology

[0007] In the preparation methods of the aqueous dispersions disclosed in patents CN101982486A and EP0440957A, there is a peroxidation problem. The reason is that the solubility of 3,4-ethylenedioxythiophene and its derivatives in water is low, so that the reaction metering Only a small part of 3,4-ethylenedioxythiophene and its derivatives can dissolve and react with oxidants, resulting in excessive oxidants and peroxidation.
The existence of the peroxidation problem has caused the prepared aqueous dispersion to contain more side reaction products, resulting in poor product stability, large particle size, and low electrical conductivity, especially the low electrical conductivity, which greatly limits the ability of polythiophene derivatives. Application of water dispersion

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  • Polythiophene derivative aqueous dispersion and preparation method thereof

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[0036] Specifically, the present invention provides a method for preparing an aqueous dispersion of polythiophene derivatives, comprising the following steps:

[0037] Step 1, mixing 3,4-dialkoxythiophene, polyanion, oxidizing agent, solubilizer and aqueous solvent for reaction;

[0038] Step 2, subjecting the solution obtained after the reaction to anion exchange and / or cation exchange treatment to obtain an aqueous dispersion of polythiophene derivatives;

[0039] Wherein, the structural formula of the 3,4-dialkoxythiophene is shown in the following formula (1):

[0040]

[0041] (1) In the formula, R 1 , R 2 are independent of each other and are hydrogen or C 1-4 Alkyl groups, or together form C 1-4 The alkylene group can be optionally substituted.

[0042] Wherein, the molar ratio of the 3,4-dialkoxythiophene, polyanion and oxidant is: 3,4-dialkoxythiophene:polyanion:oxidant=1:2~50:1.5~3, the The mass ratio of 3,4-dialkoxythiophene to solubilizer is: 3,4-dialkoxythi...

Embodiment 1

[0063] Solubilizer: polyoxyethylene stearate

[0064] Oxidant: 35wt% sodium persulfate aqueous solution + 1wt% ferric sulfate aqueous solution

[0065] Aqueous solvent: deionized water

[0066] 100g polystyrene sulfonic acid, 9.1g polyoxyethylene stearate (HLB value 16.5~17.5), 50g of 35wt% sodium persulfate aqueous solution, 14.4g of 1wt% iron sulfate aqueous solution were added to 2000g deionized water in sequence , stirred for 30 minutes, and then 9.1 g of 3,4-dialkoxythiophene was added to the above aqueous solution, and stirred for 24 h. After the reaction, add 200g of cationic resin and 200g of anionic resin to the reaction system and stir for 12h, filter off the resin to obtain poly(3,4-dialkoxythiophene) polyanion dispersion. After testing, the dispersion contains 0.4wt% of poly(3,4-dialkoxythiophene), 1.3wt% of polystyrenesulfonic acid, 0.4wt% of polyoxyethylene stearate, and a solid content of 2.1wt%. , viscosity is 2000cps, particle size d 50 It is 105nm, and th...

Embodiment 2

[0068] Solubilizer: castor oil polyoxyethylene ether

[0069] Oxidant: 35wt% sodium persulfate aqueous solution + 1wt% ferric sulfate aqueous solution

[0070] Aqueous solvent: deionized water

[0071] 100g polystyrene sulfonic acid, 10.9g castor oil polyoxyethylene ether (HLB value 15.5~16.5), 50g 35wt% sodium persulfate aqueous solution, 14.4g 1wt% ferric sulfate aqueous solution were added to 2000g deionized water successively, Stir for 30 minutes, then add 9.1 g of 3,4-dialkoxythiophene into the above aqueous solution, and stir for 24 h. After the reaction, add 200 g of cationic resin and 200 g of anionic resin to the reaction system and stir for 12 hours, filter off the resin, and obtain poly(3,4-dialkoxythiophene) polyanionic dispersion. After testing, the dispersion contains 0.4wt% poly(3,4-dialkoxythiophene), 1.4wt% polystyrenesulfonic acid, 0.5wt% castor oil polyoxyethylene ether, and a solid content of 2.3wt%. The viscosity is 2300cps, the particle size is d 50 I...

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Abstract

The invention relates to a polythiophene derivative aqueous dispersion and a preparation method thereof, and aims at improving the electrical conductivity and other properties of the aqueous dispersion. The aqueous dispersion is prepared from the following components in percent by mass: 0.3-10 percent of poly(3,4-dialkoxythiophenes), 0.3-20 percent of polyanion and 0.06-20 percent of solubilizer. The preparation method comprises the following steps: mixing poly(3,4-dialkoxythiophenes), polyanion, oxidant, solubilizer and aqueous solvent to react; carrying out anion exchange and / or cation exchange treatment on the solution obtained after reaction so as to obtain the polythiophene derivative aqueous dispersion, wherein the solubilizer is one or more of polysorbates, polyoxyethylene aliphatates, tweens, polyoxyethylene hardened castor oil, polyoxyethylene castor oil, fatty alcohol polyoxyethylene-polyoxypropylene ether, polyoxyethylene sorbitan fatty acid ester and polyglycerol fatty acid ester. The dispersion prepared by the method is high in viscosity, small in granularity and high in electrical conductivity.

Description

technical field [0001] The invention relates to the field of conductive polymer materials, in particular to an aqueous dispersion of polythiophene derivatives and a preparation method thereof. Background technique [0002] Conductive polymers are a class of polymer compounds with a conjugated π bond structure. After chemical or electrochemical doping with anions or cations, special conductive polymer materials are formed, including polyacetylene, polythiophene, and polypyrrole. , polyaniline, polyparaphenylene, polycarbazole, polyfluorene, etc. The outstanding advantages of conductive polymers are that they not only have the optoelectronic properties of metals and semiconductor materials, but also have good stability and mechanical properties of polymers, are relatively light in weight, and are easy to process. At present, the most successful conductive polymers in the industrial field are polyaniline and polythiophene, especially poly(3,4-ethylenedioxythiophene) (PEDOT) am...

Claims

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Application Information

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IPC IPC(8): C08L65/00C08L71/02C08G61/12C08J3/03
Inventor 赵大成李付亚
Owner SHENZHEN CAPCHEM TECH
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