Preparation method for regulating PEDOT: PSS dispersion liquid through reaction of different emulsifiers

Abstract

The invention belongs to the field of conductive polymer materials, and particularly relates to a preparation method for regulating PEDOT: PSS dispersion liquid by utilizing reaction of different emulsifiers. The invention firstly provides a composition for synthesizing a PEDOT: PSS dispersion liquid. The composition comprises an EDOT monomer, poly (4-styrenesulfonic acid) and an amphiphilic emulsifier; the amphiphilic emulsifier comprises one or more materials selected from the group consisting of an anionic emulsifier, a cationic emulsifier, a zwitterionic emulsifier, and a nonionic emulsifier. The PEDOT: PSS material prepared by the method disclosed by the invention is high in conductivity and can be widely applied to various fields such as transparent electrodes, antistatic coatings and energy storage devices.

Description

Technical Field

[0001] The invention belongs to the field of conductive polymer materials, and in particular relates to a preparation method of a PEDOT:PSS dispersion liquid by regulating the reaction of different emulsifiers. Background Art

[0002] PEDOT is a polymer of 3,4-ethylenedioxythiophene (EDOT) monomers, which has high conductivity (600 S / cm), great stability and excellent visible light transmittance, and therefore has attracted widespread attention. However, PEDOT itself is insoluble, which limits its application. Currently, a water-soluble polymer electrolyte, polystyrene sulfonic acid (PSSH), is commonly used to dope PEDOT to solve the processability problem.

[0003] Poly(3,4-ethylenedioxythiophene):poly(4-styrenesulfonic acid) (PEDOT:PSS) is a kind of conductive polymer colloidal particles in the form of dark blue aqueous dispersion, which is easy to process. Clevios PH1000 can achieve a conductivity of 800-1000 S / cm after secondary doping and spin coating. It also has high mechanical strength, high visible light transmittance (almost transparent in the visible light range), excellent electrochemical properties and thermal stability (can withstand more than 1000 hours at a high temperature of 100°C, and the conductivity is almost unchanged). At present, this product has been widely used in various fields, such as solid electrolytic capacitors, antistatic coatings, through-hole circuit board plating (LED), etc.

[0004] In the existing research reports on PEDOT:PSS, its conductivity is far from that of Clevios PH1000.

[0005] The patent with publication number CN116656059A and invention name "Pure PEDOT:PSS hydrogel rapidly induced by surfactant and preparation method" discloses that a dry gel film is obtained by using a PEDOT:PSS aqueous solution as a matrix, fully stirring and mixing with a cationic surfactant, and then undergoing subsequent process treatment. After that, it is re-expanded into a hydrogel, and the residual cationic surfactant is completely removed to obtain a pure PEDOT:PSS hydrogel. This patent induces conformational changes in PEDOT:PSS through secondary doping with cationic surfactants, which solves the problem of improving the electrical properties, mechanical properties and swelling properties of PEDOT:PSS hydrogels. However, the patent method does not provide technical inspiration for the synthesis process of the PEDOT:PSS dispersion itself, nor does it provide a solution for improving the electrical properties of the PEDOT:PSS dispersion itself. The patent with publication number CN107955137A and invention name "A PEDOT aqueous dispersion using a macromolecular emulsifier as a template and a preparation method thereof" discloses that a RAFT agent containing aliphatic or aromatic long chains and sodium vinylbenzenesulfonate are first polymerized to obtain a macromolecular emulsifier sodium alkyl polyvinylbenzenesulfonate, and then this macromolecular emulsifier is polymerized with EDOT monomer to obtain a PEDOT:PSS aqueous dispersion. However, this patent strategy actually provides a new R-PSS template to change the dispersibility of PEDOT in water. However, changing the template PSS structure may have a positive or negative effect on the dispersibility of PEDOT, and there are unknowns. In addition, the synthesis of new substances often requires additional processes and costs.

[0006] Therefore, new methods and strategies need to be proposed to alleviate the shortcomings of existing technologies. Summary of the invention

[0007] In view of this, the purpose of the present invention is to provide a method for preparing a PEDOT:PSS dispersion by regulating the reaction of different emulsifiers, so as to partially solve or alleviate the above-mentioned deficiencies in the prior art. The present invention specifically adopts the following technical solutions.

[0008] A composition for synthesizing a PEDOT:PSS dispersion, the composition comprising an EDOT monomer, poly (4-styrene sulfonic acid) and an amphiphilic emulsifier; the amphiphilic emulsifier comprises one or more materials selected from the group consisting of anionic emulsifiers, cationic emulsifiers, zwitterionic emulsifiers and nonionic emulsifiers; the weight ratio of poly (4-styrene sulfonic acid) to EDOT monomer in the composition is (2-3):1; the weight percentage of the amphiphilic emulsifier is 0.01-0.1wt%.

[0009] Furthermore, the weight percentage of the amphiphilic emulsifier is 0.05-0.1 wt %.

[0010] As a preferred embodiment, the weight percentage of the amphiphilic emulsifier includes 0.05 wt%, 0.06 wt%, 0.07 wt%, 0.08 wt%, 0.09 wt% or 0.1 wt%.

[0011] Furthermore, the weight percentage of the EDOT monomer used in the composition is 0.2-0.5 wt %, and the weight percentage of the poly(4-styrene sulfonic acid) is 0.5-1.5 wt %.

[0012] Furthermore, the anionic emulsifier includes sodium dodecylbenzene sulfonate, sodium stearate, sodium alkyl sulfonate, sodium alkyl aryl sulfonate, sodium alkyl sulfate or sodium secondary alkyl sulfate.

[0013] Furthermore, the cationic emulsifier includes dodecyldimethylamine oxide, hexadecyltrimethylammonium bromide or hexadecyltrimethylammonium chloride.

[0014] Furthermore, the zwitterionic emulsifier includes dodecyl dimethyl hydroxypropyl carbonyl betaine, dodecyl aminopropionic acid, dodecyl dimethyl betaine or dodecyl dimethyl hydroxypropyl phosphate betaine.

[0015] The above-mentioned ionic emulsifiers generally contain hydrophobic groups and hydrophilic groups; the hydrophilic groups can form hydrogen bonds with water molecules, while the hydrophobic groups can interact with oil molecules.

[0016] Furthermore, the nonionic emulsifier includes decaethylene glycol monododecyl ether, alkylphenol polyoxyethylene ether, fatty acid polyoxyethylene ester, polyoxyethylene alkylamine or polyoxyethylene alkylamide.

[0017] Furthermore, the composition also includes a catalyst and an oxidant, wherein the catalyst includes ferric sulfate, ferrous sulfite, ferric chloride or ferrous chloride; and the oxidant includes sodium sulfate, ammonium persulfate, sodium persulfate or potassium persulfate.

[0018] It is to be understood that the types of the above-mentioned anionic emulsifiers, cationic emulsifiers, zwitterionic emulsifiers, nonionic emulsifiers, catalysts and oxidants are merely examples and not limitations.

[0019] Furthermore, the molecular weight of the poly(4-styrene sulfonic acid) is in the range of 50-200 kg / mol.

[0020] The method for preparing a PEDOT:PSS dispersion based on the above composition comprises the following steps: S01: 0.2-0.5wt% of EDOT monomer, 0.5-1.5wt% of poly(4-styrene sulfonic acid), 0.01-0.1wt% of amphiphilic emulsifier and appropriate amount of deionized water are added to a reaction vessel and stirred evenly to form an emulsion, which is then transferred to a reactor and the reaction temperature in the reactor is set to not exceed 30°C; S02: setting the reactor to an oxygen-free environment, such as a nitrogen or argon environment, to isolate oxygen in the air from participating in the polymerization of PEDOT, thereby affecting the chain length of the synthesized PEDOT; S03: After 0.001-0.5wt% of a catalyst, 0.5-1.5wt% of an oxidant and an appropriate amount of deionized water are uniformly stirred, the mixture is slowly added dropwise into a reactor to react with emulsion polymerization to obtain a first crude product of a PEDOT:PSS dispersion; when the color of the reaction solution changes from transparent to black, it indicates that a PEDOT:PSS dispersion is generated; S04: filtering the first crude product of the PEDOT:PSS dispersion through a cation exchange resin and an anion exchange resin, respectively, to obtain a second crude product of the PEDOT:PSS dispersion; insufficient filtration will result in low conductivity and poor film-forming properties of the PEDOT:PSS dispersion; S05: briefly homogenizing the second crude PEDOT:PSS dispersion at a pressure of 150-300 bar to obtain the finished PEDOT:PSS dispersion.

[0021] Furthermore, the weight percentage of the amphiphilic emulsifier is 0.05-0.1 wt %.

[0022] Furthermore, in S01, high-speed stirring emulsification is adopted, the stirring speed is 1000-50000 rpm, and the stirring time is 10-120 minutes.

[0023] Furthermore, the time for slowly adding the catalyst and the oxidant into S03 is 30-300 min.

[0024] Beneficial technical effects: The present invention provides a new method for enhancing the conductivity of PEDOT:PSS by adjusting the molecular structure of PEDOT by adding an emulsifier, realizes the independent research and development of high-conductivity PEDOT:PSS, and alleviates the problems of low cost of high-conductivity PEDOT:PSS aqueous dispersion and high price of imported finished products.

[0025] Specifically, the present invention achieves the regulation of the PEDOT molecular structure by adding a specific amount of amphiphilic emulsifier during the PEDOT polymerization process, thereby achieving the enhancement of the PEDOT:PSS conductivity. Specifically, the method of the present invention is to add a specific amount of ready-made amphiphilic emulsifier to the synthesis system for polymerization reaction, and does not introduce other components and processes to change the template PSS, so the difficulty of the PEDOT:PSS synthesis process is not significantly increased. By adding a specific amount of ready-made amphiphilic emulsifier, the surface tension is reduced, the EDOT monomer molecules are dispersed into small droplets, and a protective layer is formed on the surface of the droplets to stabilize the emulsion, and part of the monomers are dissolved in the micelles, providing a more favorable environment for the growth of the PEDOT molecular chain, thereby regulating the PEDOT molecular structure to prepare a high conductivity PEDOT:PSS dispersion. The present invention tests different types of emulsifiers (including anionic emulsifiers, cationic emulsifiers, zwitterionic emulsifiers and non-ionic emulsifiers). At this addition amount, the effect of conductivity enhancement can be achieved, and the film-forming property is good, so the method of the present invention has certain universality.

[0026] Finally, the method of the present invention is simple to operate, the process specifications are controllable, and the process cost is not high, so it has a prospect for industrial promotion. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, each element or part is not necessarily drawn according to the actual scale. Obviously, the drawings described below are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings without paying creative labor.

[0028] Figure 1 is a process flow chart of the preparation method of the present invention; Figure 2 The conductivity distribution diagram of PEDOT:PSS synthesized using different emulsifiers; Figure 3 The figure is a comparison of the film-forming properties of dispersions with and without emulsifiers. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0030] It should be noted that, in this article, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the existence of other identical elements in the process, method, article or device including the element.

[0031] Herein "and / or" includes any and all combinations of one or more of the associated listed items.

[0032] Herein, "plurality" means two or more than two, ie, it includes two, three, four, five, etc.

[0033] As used in this specification, the term "about" typically means + / - 5% of the stated value, more typically + / - 4% of the stated value, more typically + / - 3% of the stated value, more typically + / - 2% of the stated value, even more typically + / - 1% of the stated value, and even more typically + / - 0.5% of the stated value.

[0034] In this specification, some embodiments may be disclosed in a format that is in a certain range. It should be understood that this description of "being in a certain range" is only for convenience and brevity, and should not be interpreted as a rigid limitation on the disclosed range. Therefore, the description of the range should be considered to have specifically disclosed all possible sub-ranges and independent numerical values ​​within this range. For example, the description of the range 1 to 6 should be considered to have specifically disclosed sub-ranges such as from 1 to 3, from 1 to 4, from 1 to 5, from 2 to 4, from 2 to 6, from 3 to 6, etc., and individual numbers within this range, such as 1, 2, 3, 4, 5 and 6. Regardless of the breadth of the range, the above rules apply.

[0035] Example 1 This example provides an overview of a method for preparing a PEDOT:PSS dispersion by regulating the reaction of different emulsifiers.

[0036] Those skilled in the art can understand that the "emulsifier" is an amphiphilic surfactant, whose molecular structure is amphiphilic, with a hydrophilic group at one end and a hydrophobic group at the other end.

[0037] The preparation method of PEDOT:PSS dispersion using emulsifier reaction regulation provided in this embodiment is as follows.

[0038] S01: 0.2-0.5wt% of EDOT monomer, 0.5-1.5wt% of poly(4-styrenesulfonic acid) (PSSH), 0.01-0.1wt% of emulsifier and appropriate amount of deionized water are added to a reaction container, stirred evenly to form an emulsion, and then moved to a reactor, wherein the reactor is in a water bath environment, and the water bath temperature is set not to exceed 30°C.

[0039] S02: The reactor is set to an oxygen-free environment, such as a nitrogen or argon environment.

[0040] S03: After uniformly mixing 0.001-0.5wt% of a catalyst, 0.5-1.5wt% of an oxidant and an appropriate amount of deionized water, slowly dripping them into a reactor to react with emulsion polymerization to obtain a first crude product of a PEDOT:PSS dispersion.

[0041] S04: The first crude product of the PEDOT:PSS dispersion is filtered by mixing and stirring with a cation exchange resin and an anion exchange resin to obtain a second crude product of the PEDOT:PSS dispersion.

[0042] S05: briefly homogenizing the second crude PEDOT:PSS dispersion at a pressure of 50-300 bar to obtain the finished PEDOT:PSS dispersion.

[0043] The emulsifier includes one or more selected from anionic emulsifiers, cationic emulsifiers, zwitterionic emulsifiers and / or nonionic emulsifiers.

[0044] Wherein, the catalyst includes one or more of ferric sulfate, ferrous sulfite, ferric chloride and / or ferrous chloride; the oxidant includes one or more selected from sodium sulfate, ammonium persulfate and / or potassium persulfate.

[0045] Wherein, the molar mass (Mw) of the poly(4-styrene sulfonic acid) is in the range of 50-200 kg / mol.

[0046] It is understood that the molar mass (Mw) of the poly(4-styrenesulfonic acid) ranges from 50 to 100 kg / mol, 100 to 150 kg / mol, and 150 to 200 kg / mol.

[0047] Wherein, the weight ratio of poly(4-styrene sulfonic acid) to EDOT monomer is (2-3):1.

[0048] In some optional embodiments, the molar ratio of the oxidant to the EDOT monomer is (0.5-1.5):1.

[0049] In some optional embodiments, the molar ratio of the catalyst to the EDOT monomer is (0.01-0.5):1.

[0050] In some optional embodiments, the ion exchange resin is a mixture of a strong base styrene-based anion exchange resin and a strong acid styrene-based cation exchange resin, wherein the volume ratio of the strong acid cation exchange resin to the strong base anion exchange resin is 1:0.1-3, and the volume ratio of the PEDOT:PSS dispersion to the mixed anion and cation exchange resin is 1:0.2-20.

[0051] The EDOT monomer and poly(4-styrene sulfonic acid) are stirred during the polymerization synthesis, the stirring speed is 50-2000 rpm, and the synthesis reaction time is 20-60 hours.

[0052] The PEDOT:PSS dispersion and the ion exchange resin are stirred and mixed for 2-24 hours at a temperature of 10-25°C.

[0053] The high pressure homogenizer homogenizes the PEDOT:PSS dispersion at a pressure of 5-300 bar and at a frequency of 1-30 times.

[0054] Example 2 This embodiment provides an example of a specific preparation method for regulating the reaction of PEDOT:PSS dispersion using different emulsifiers.

[0055] In this embodiment, an anionic surfactant is added to synthesize a PEDOT:PSS dispersion, and the specific steps are as follows.

[0056] S01: 0.4 wt% EDOT, 0.95 wt% poly(4-styrene sulfonic acid) (PSSH) with a molecular weight of 70 kg / mol, 0.08 wt% anionic surfactant sodium dodecylbenzene sulfonate, and 50 ml of deionized water were added to the reaction vessel in sequence and stirred evenly. After emulsification with a high-speed stirrer for 30 minutes, the formed emulsion was transferred to the reactor.

[0057] S02: Treat the reactor containing the emulsion into a nitrogen environment.

[0058] S03: 0.9 wt% sodium persulfate, 0.1 wt% ferric sulfate and 20 ml of deionized water were added to the reaction container in sequence and stirred evenly, and then added dropwise to the reactor to react with the emulsion polymerization in the reactor for 24 hours to obtain the first crude product of PEDOT:PSS dispersion.

[0059] S04: Add anion and cation exchange resin to the first crude PEDOT:PSS dispersion: cation exchange resin: anion exchange resin in a ratio of 1:0.5:0.5, mix and stir to react for 8 hours, and obtain the second crude PEDOT:PSS dispersion after filtering.

[0060] S05: The second crude PEDOT:PSS dispersion was homogenized with a high-pressure homogenizer at a pressure of 150 bar for 5 minutes to obtain a finished PEDOT:PSS dispersion.

[0061] S06: Take out 5 ml of the finished PEDOT:PSS dispersion, add 5% DMSO, stir evenly, and then evenly spin-coat it on the surface of a glass sheet using a spin coating method, and anneal on a heating table at 120°C for 10 minutes to obtain a dry PEDOT:PSS film.

[0062] In this embodiment, the molar ratio of the oxidant sodium persulfate to the EDOT monomer is (0.5-1.5): 1; the molar ratio of the catalyst iron sulfate to the EDOT monomer is (0.01-0.5): 1. The conductivity of the detected film is 377±34 S / cm.

[0063] It is to be understood that the sodium dodecylbenzene sulfonate used in this embodiment is only an example, and other anionic emulsifiers, such as sodium stearate, sodium alkyl sulfonate, sodium alkyl aryl sulfonate, sodium alkyl sulfate or secondary alkyl sodium sulfate, are also within the scope of protection of the present invention.

[0064] Example 3 This embodiment provides another example of a specific preparation method for regulating the reaction of PEDOT:PSS dispersion using different emulsifiers.

[0065] In this embodiment, a cationic surfactant is added to synthesize a PEDOT:PSS dispersion, and the specific steps are as follows.

[0066] S01: 0.4 wt% EDOT, 0.95 wt% poly(4-styrene sulfonic acid) (PSSH) with a molecular weight of 70 kg / mol, 0.08 wt% cationic surfactant dodecyl dimethyl amine oxide, and 50 ml of deionized water were added to the reaction container in sequence and stirred evenly. After emulsification with a high-speed stirrer for 30 minutes, the formed emulsion was transferred to the reactor.

[0067] S02-S06 are the same as in Example 2, and a dry PEDOT:PSS film is obtained. The conductivity of the film is detected to be 382±17 S / cm.

[0068] It is to be understood that the dodecyl dimethyl amine oxide used in this embodiment is only an example, and other cationic emulsifiers, such as hexadecyl trimethyl ammonium bromide or hexadecyl trimethyl ammonium chloride, are also within the scope of protection of the present invention.

[0069] Example 4 This embodiment provides another example of a specific preparation method for regulating the reaction of PEDOT:PSS dispersion using different emulsifiers.

[0070] In this embodiment, a zwitterionic ionic surfactant is added to synthesize a PEDOT:PSS dispersion, and the specific steps are as follows.

[0071] S01: 0.4 wt% EDOT, 0.95 wt% poly(4-styrene sulfonic acid) (PSSH) with a molecular weight of 70 kg / mol, 0.08 wt% zwitterionic surfactant dodecyl dimethyl hydroxypropyl carbobetaine, and 50 ml of deionized water were added to the reaction vessel in sequence and stirred evenly. After emulsification with a high-speed stirrer for 30 minutes, the formed emulsion was transferred to the reactor.

[0072] S02-S06 are the same as in Example 2, and a dry PEDOT:PSS film is obtained. The conductivity of the film is detected to be 373±32 S / cm.

[0073] It is to be understood that the dodecyl dimethyl hydroxypropyl carbonyl betaine used in this embodiment is only an example, and other zwitterionic emulsifiers, such as dodecyl aminopropionic acid, dodecyl dimethyl betaine or dodecyl dimethyl hydroxypropyl phosphate betaine, are also within the scope of protection of the present invention.

[0074] Example 5 This embodiment provides another example of a specific preparation method for regulating the reaction of PEDOT:PSS dispersion using different emulsifiers.

[0075] In this embodiment, a nonionic surfactant is added to synthesize a PEDOT:PSS dispersion, and the specific steps are as follows.

[0076] S01: 0.4 wt% EDOT, 0.95 wt% poly(4-styrene sulfonic acid) (PSSH) with a molecular weight of 70 kg / mol, 0.08 wt% non-ionic surfactant decaethylene glycol monododecyl ether, and 50 ml of deionized water were added to the reaction vessel in sequence and stirred evenly. After emulsification with a high-speed stirrer for 30 minutes, the formed emulsion was transferred to the reactor.

[0077] S02-S06 are the same as in Example 2, and a dry PEDOT:PSS film is obtained. The conductivity of the film is detected to be 387±27 S / cm.

[0078] It is understandable that the decaethylene glycol monododecyl ether used in this embodiment is only an example, and other non-ionic emulsifiers, such as alkylphenol polyoxyethylene ethers, fatty acid polyoxyethylene esters, polyoxyethylene alkylamines or polyoxyethylene alkylamides, are also within the scope of protection of the present invention.

[0079] Example 6 This example provides an existing preparation method as a comparison.

[0080] S01: 0.4 wt% EDOT, 0.95 wt% poly(4-styrenesulfonic acid) (PSSH) with a molecular weight of 70 kg / mol, and 50 ml of deionized water were added to the reaction vessel in sequence and stirred evenly. After emulsification with a high-speed stirrer for 30 minutes, the formed emulsion was transferred to the reactor.

[0081] S02-S06 are the same as in Example 2, and a dry PEDOT:PSS film is obtained. The conductivity of the film is detected to be 216±32 S / cm.

[0082] The embodiments of the present invention are described above in conjunction with the accompanying drawings, but the present invention is not limited to the above-mentioned specific implementation modes, which are merely illustrative rather than restrictive. Under the guidance of the present invention, ordinary technicians in this field can also make many forms without departing from the scope of protection of the present invention and the claims, all of which are within the protection of the present invention.

Claims

1. A composition for synthesizing a PEDOT:PSS dispersion, characterized in that: The composition includes EDOT monomer, poly (4-styrene sulfonic acid) and an amphiphilic emulsifier; the amphiphilic emulsifier comprises one or more materials selected from the group consisting of anionic emulsifiers, cationic emulsifiers, zwitterionic emulsifiers and nonionic emulsifiers; the weight ratio of poly (4-styrene sulfonic acid) to EDOT monomer in the composition is (2-3): 1; the weight percentage of the amphiphilic emulsifier is 0.01-0.1wt%.

2. The composition according to claim 1, characterized in that The anionic emulsifier includes sodium dodecylbenzene sulfonate, sodium stearate, sodium alkyl sulfonate, sodium alkyl aryl sulfonate, sodium alkyl sulfate or sodium secondary alkyl sulfate.

3. The composition according to claim 1, characterized in that The cationic emulsifier includes dodecyldimethylamine oxide, hexadecyltrimethylammonium bromide or hexadecyltrimethylammonium chloride.

4. The composition according to claim 1, characterized in that The zwitterionic emulsifier includes dodecyl dimethyl hydroxypropyl carbonyl betaine, dodecyl aminopropionic acid, dodecyl dimethyl betaine or dodecyl dimethyl hydroxypropyl phosphate betaine.

5. The composition according to claim 1, characterized in that The nonionic emulsifier includes decaethylene glycol monododecyl ether, alkylphenol polyoxyethylene ether, fatty acid polyoxyethylene ester, polyoxyethylene alkylamine or polyoxyethylene alkylamide.

6. The composition according to claim 1, characterized in that The composition also includes a catalyst and an oxidant. The catalyst includes ferric sulfate, ferrous sulfite, ferric chloride or ferrous chloride; the oxidant includes sodium sulfate, ammonium persulfate, sodium persulfate or potassium persulfate.

7. The composition according to claim 1, characterized in that The molecular weight of the poly(4-styrene sulfonic acid) is in the range of 50-200 kg / mol.

8. A method for preparing a PEDOT:PSS dispersion based on the composition according to any one of claims 1 to 7, characterized in that: The following steps are involved: S01: 0.2-0.5wt% of EDOT monomer, 0.5-1.5wt% of poly(4-styrene sulfonic acid), 0.01-0.1wt% of amphiphilic emulsifier and appropriate amount of deionized water are added to a reaction vessel and stirred evenly to form an emulsion, which is then transferred to a reactor and the reaction temperature in the reactor is set to not exceed 30°C; S02: Set the reactor to an oxygen-free environment; S03: 0.001-0.5wt% of a catalyst, 0.5-1.5wt% of an oxidant and an appropriate amount of deionized water are uniformly stirred, and then slowly added dropwise into a reaction kettle to undergo polymerization reaction with the emulsion to obtain a first crude product of a PEDOT:PSS dispersion; S04: filtering the first crude product of the PEDOT:PSS dispersion through a cation exchange resin and an anion exchange resin, respectively, to obtain a second crude product of the PEDOT:PSS dispersion; S05: briefly homogenizing the second crude PEDOT:PSS dispersion at a pressure of 150-300 bar to obtain the finished PEDOT:PSS dispersion.

9. The method according to claim 8, characterized in that In the S01, high-speed stirring emulsification is adopted, the stirring speed is 1000-50000 rpm, and the stirring time is 10-120 minutes.

10. The method according to claim 8, characterized in that The time for slowly adding the catalyst and the oxidant into the S03 is 30-300 min.

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